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Article

Predator-Unfriendly Pesticides Harm the Beneficial Mite Neoseiulus idaeus Denmark & Muma (Acari: Phytoseiidae)

by
Geovanny Barroso
1,*,†,
Lucas Lorena Godoy
2,†,
Fernando Henrique Iost Filho
2,
Mariana Yamada
2,
Emile Dayara Rabelo Santana
2,
Juliano de Bastos Pazini
2,
Luana Vitória de Queiroz Oliveira
3 and
Pedro Takao Yamamoto
2,4
1
Biosciences Institute, São Paulo State University, Rio Claro 13506-900, SP, Brazil
2
Department of Entomology and Acarology, College of Agriculture Luiz de Queiroz, University of São Paulo, Piracicaba 13418-900, SP, Brazil
3
Entomology Laboratory, Agrarian Science Center, Federal University of Paraíba, Areia 58397-000, PB, Brazil
4
CNPq Researcher
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Agronomy 2023, 13(4), 1061; https://doi.org/10.3390/agronomy13041061
Submission received: 1 February 2023 / Revised: 22 March 2023 / Accepted: 23 March 2023 / Published: 5 April 2023
(This article belongs to the Section Pest and Disease Management)

Abstract

:
Pesticides are commonly used to control weeds, diseases, and pests in soybean crops, although natural enemies are also key components of integrated pest management programs protecting soybean from pests. The predatory mite Neoseiulus idaeus Denmark & Muma is commonly found in soybeans associated with tetranychid mites. We determined the compatibility of some pesticides used in Brazilian soybean fields with N. idaeus on the basis of their lethal and sub-lethal effects. We assessed the acute toxicity of pesticides that are considered harmless to females of N. idaeus and evaluated the effects on the mite offspring. Acephate as well as imidacloprid and bifenthrin were most toxic to adult females and were classified as harmful. Chlorfenapyr, indoxacarb, and the neonicotinoid and pyrethroid mixtures were classified as slightly to moderately harmful. Immatures of N. idaeus were able to develop and reach the adult stage when treated with chlorantraniliprole, flubendiamide, glyphosate, and teflubenzuron, but immature survival was reduced to 42 and 64% for offspring of females treated with chlorantraniliprole or teflubenzuron, respectively. Reproduction was most affected in females exposed to chlorantraniliprole and teflubenzuron; these females had daily oviposition rates of 0.5 and 0.4 egg/female/day, respectively, and mean fecundities of 2.7 and 5.8 eggs/female, respectively. On the basis of sublethal effects and life table parameters, chlorantraniliprole was classified as moderately harmful, while the other pesticides tested were classified as harmless. In considering the use of pesticides while targeting the conservation of N. idaeus as a predator of important pests in soybean crops, one must prioritize pesticides that will most likely have less harmful effects on this predator in the field.

1. Introduction

Soybean (Glycine max (L.) Merrill) is one of the main foods consumed in the world [1,2,3] due to its highly nutritious composition, including edible proteins used in human and animal diets [4]. Soybean also has important social and economic roles, generating employment and income though production chains. World soybean production in 2021–2022 was 352.74 million metric tons for 130.43 million hectares planted [5]. In Brazil, the largest global soybean producer, the 2021–2022 harvest corresponded to 126.00 million metric tons per hectare of planted area, with a productivity of 3.07 metric tons per hectare [6].
Soybean production can be affected by weeds, diseases, and pests throughout the production cycle. Major lepidopteran soybean pests are Anticarsia gemmatalis Hübner (Erebidae), Chrysodeixis includens (Walker), Helicoverpa armigera (Hübner), and the Spodoptera complex (Noctuidae) [7,8,9,10,11,12,13]. Stink bugs represent another group of important soybean pests, primarily Nezara viridula (Linnaeus), Piezodorus guildinii (West.), and Euschistus heros (Fabricius) (Hemiptera: Pentatomidae) [14,15,16,17]. Moreover, many species of tetranychid mites occasionally occur in soybean fields [18,19,20,21,22,23,24]. For example, Mononychellus planki (McGregor) and Tetranychus urticae Koch (Acari: Tetranychidae) have been reported to damage soybean and other crops [25,26,27,28].
Indiscriminate use of pesticides causes ecological problems, including contamination of soil and water, adverse effects on non-target organisms, and pest resistance to insecticides [29,30]. Integrated pest management aims to rationalize the use of control tactics, especially to reduce the application of broad-spectrum insecticides and to promote the integration of different pest-control tactics, mainly through the use of culture methods and biological-control agents [31,32,33]. Finding ecofriendly methods to control pests is vital. For this reason, biological control of pests using pathogens, parasitoids, and predators has received considerable attention in recent years.
Among predators, phytoseiid mites have been considered for their potential as control agents for phytophagous mites as well as certain insects, including whiteflies and thrips [34,35,36,37]. The family Phytoseiidae contains approximately 2557 valid species [38,39] and is one of the best-studied groups among Acari. Neoseiulus idaeus Denmark & Muma (Acari: Phytoseiidae) is a type III generalist predator [36], which feeds on different types of prey but develops and reproduces better on a diet of tetranychid mites. This predatory mite has a broad distribution in Brazil [38,39] and has been reported on several crop plants, including soybean [23,40].
Laboratory studies have shown that N. idaeus develops better when fed with Tetranuchus ludeni Zacher (Acari: Tetranychidae) and T. urticae, two important spider mites in soybean [41,42]. Reichert et al. [41,42] discussed the importance of N. idaeus as a control agent for tetranychids. In addition, the potential of N. idaeus to control T. urticae has been reported in laboratory and semi-field conditions [43,44,45,46].
In this study, we tested the compatibility of the main pesticides used in Brazilian soybean fields with the predator N. idaeus under laboratory conditions. In addition to the acute toxicity to the predatory mites, we evaluated the sublethal effects of five pesticides that caused very low mortality. For this, we assessed the development and reproductive parameters with a life table and fertility study, using the offspring of a pesticide-treated parental generation.

2. Materials and Methods

The experimental bioassays were conducted at the Integrated Pest Management Laboratory of the Department of Entomology and Acarology at Luiz de Queiroz College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, São Paulo, Brazil.
For all bioassays, the experimental units consisted of a cylindrical acrylic container (2.5 × 1.5 cm) with a base of carrageenan, where a disc of soybean leaf, variety “BMX Power RR” (2.0 cm in diameter) sprayed with a pesticide or water (negative control), was placed. The top of the cylinder was sealed with cling film (Magipack®, MP Magipack Embalagens, Criciuma, SC, Brazil) to prevent the mites from escaping. The experimental design of the bioassays was completely randomized. All bioassays were conducted in a climate-controlled chamber at 25 ± 2 °C, 75 ± 10% RH, and 12 h photoperiod.

2.1. Mites

The predatory mites were initially collected in February 2021 from soybean plants in the experimental area of the Department of Entomology and Acarology, ESALQ/USP. The mites were kept in rearing units like those described by McMurtry and Scriven [47], which consisted of a rectangular plastic container with a hydrophilic sponge saturated with water. A leaf of Canavalia ensiformis (Linnaeus) DC. (Fabaceae) was placed on the sponge, and a layer of hydrophilic cotton on the leaf’s edges prevented the mites from escaping and maintained leaf turgidity. The mites were kept in a room (22–27 °C, 75 ± 10% RH, in darkness), and were continually fed with two-spotted spider mites (60% eggs and 40% immature stages). The initial colony of spider mites was obtained by Promip Manejo Integrado LTDA, Engenheiro Coelho, SP, Brazil. These mites were reared on C. ensiformis plants in a climate-controlled chamber at 25 ± 3 °C, 75 ± 10% RH, and 14 h photoperiod. Every seven days, a new rearing unit was assembled, and the predatory mites were transferred to it. Identification of the T. urticae and N. idaeus specimens was confirmed by Geovanny Barroso.

2.2. Pesticides

The pesticides selected for the bioassays were chosen on the basis of the Brazilian Phytosanitary Agrochemicals System (Agrofit) list [48]. They were tested at the maximum dosage recommended by the manufacturer for their biological target (Table 1).

2.3. Acute Toxicity to Adult Females

Each pesticide was sprayed (1.5–2.0 mg solution cm–2) onto a disc of soybean leaf using a calibrated Potter tower (Burkard Scientific, Uxbridge, UK) with the pressure adjusted to 0.7 kg cm–2, corresponding to a deposit of 1.8 ± 0.1 mg cm–2 of leaf area, as recommended by the International Organization for Biological and Integrated Control of Noxious Animals and Plants (IOBC) [49,50]. A few minutes after the spraying, the leaf disc was placed in an experimental unit and dried for 2 h in a climate-controlled room in the dark. Then, a single adult female of N. idaeus (mated and up to 48 h after emergence) was transferred to each unit. A leaf fragment with all life stages of spider mites (ad libitum) was added as the food source for the predator 4 h after the female N. idaeus was transferred to ensure that this predator was in contact with the previously sprayed disc during that time. The numbers of live and dead mites were evaluated 24 and 48 h after the application of the treatments. Mites were considered dead when they did not react to being touched with a fine brush. In total, the experiment had 12 treatments (pesticides) and a negative control (distilled water), with each treatment repeated 20 times, and each replicate contained one predator (adult female).

2.4. Sublethal Effects on Offspring

The sublethal effect was evaluated for the pesticides that caused corrected mortality (Cm) of up to 25% in adult females and were, therefore, classified as harmless according to the IOBC [51]. For this, a new adult female (48 h old) was transferred to a pesticide-treatment experimental unit as in the previous bioassay. Each egg laid by that female was carefully transferred to a new, pesticide-free experimental unit. Initially, each treatment consisted of approximately 50 repetitions. In this case, each repetition contained one 12-hour-old egg. Survival and duration of immature stages (larvae, protonymphs, and deutonymphs) were evaluated every 12 h until the adults emerged. The newly emerged adult females and males were placed in new experimental units to determine the pre-oviposition and oviposition periods, fecundity (number of eggs laid by females), egg viability (number of hatched larvae), and longevity of females. As the number of males in the treatments was insufficient to form all the couples, males of indeterminate age were collected in the rearing colonies and confined with the remaining females. The mites were fed daily ad libitum with a mixture of all spider mite stages (75% eggs and immatures).
The viability of eggs from the adult females treated with pesticides (parental generation, F0) was determined on the basis of the number of hatched larvae in each experimental unit. Likewise, the first 50 eggs laid by adult females of the offspring (maternal generation, F1) were evaluated. Eggs that did not progress to larvae within seven days were considered non-viable.

2.5. Data Analysis

The data for mortality and viability of eggs laid by exposed adult females (F0), and viability of the eggs laid by their offspring (F1) were analyzed with a generalized linear model with a binomial distribution. The goodness of fit was confirmed using the “hnp” package [52]. The comparisons were performed by contrasts from a binomial generalized linear model using the glht function from the multcomp package [53]. The R software 4.1.2 [54] was used for these analyses.
The sublethal effects on mites assessed for each pesticide were expressed as: E% = 100 − (100 − Cm) × Er, where Er is the coefficient of reduction or toxicity, determined by: Er = (Ftreatment/Fcontrol) × (Vtreatment/Vcontrol), where F is the ratio of the total number of eggs laid per female in the specified treatment (Ftreatment) to the total number in the control (Fcontrol); V is the ratio of the total number of larvae that hatched from eggs in this treatment (Vtreatment) to those in the control (Vcontrol) at the end of the test; and Cm is the percentage mortality calculated according to Abbott [55]. The data were analyzed considering the recommendations of the IOBC-WPRS [50,51], and toxicity classes were assigned on the basis of overall effects (E) to classify each pesticide as follows: Class 1 = harmless (E < 25%); Class 2 = slightly harmful (25 ≤ E ≤ 50%); Class 3 = moderately harmful (50% ≤ E ≤ 75%); and Class 4 = harmful (E > 75%).
The effects of the pesticides on the offspring (F1) were estimated from life table data [56], using the Age–Stage method developed by Chi [57] with the TWOSEX-MSChart software [57,58]. The means and standard errors of the biological parameters were obtained using a paired bootstrap test, as proposed by Huang and Chi [59], with 100,000 bootstraps. The mean and standard errors were estimated for Dunn’s test with Bonferroni correction (p < 0.05) when this was not possible using the Age–Stage method.

3. Results

3.1. Acute Toxicity to Adult Females

Mortality rates differed among the pesticides and were highest for acephate and for imidacloprid and bifenthrin (Table 2). These insecticides were toxic over the short term and caused 100% mortality within 48 h. Mortality rates higher than 25% were observed for the pesticides formulated with a ready-mix of neonicotinoid and pyrethroid. In contrast, chlorantraniliprole, glyphosate, and teflubenzuron caused low mortality to the mite and, therefore, were classified as harmless.

3.2. Sublethal Effects on Offspring

3.2.1. Development Time and Survival Rates of Immature Stages

Offspring of N. idaeus could develop and completed their life cycle when the progenitor females were exposed to chlorantraniliprole residue. Nevertheless, this pesticide reduced the egg viability most, achieving 69% survival (Table 3). The offspring of females exposed to flubendiamide had a shorter egg development time, significantly different from all treatments (χ2 = 67.5; df = 4; p < 0.001). Likewise, the larvae that emerged from viable eggs had a shorter mean duration in the teflubenzuron, which differed from chlorantraniliprole and flubendiamide but was equal to glyphosate and control treatments (χ2 = 33.4; df = 4; p < 0.001). Significant differences in protonymph duration were detected (χ2 = 22.9; df = 4; p < 0.001); however, post hoc tests revealed the only difference observed was for individuals in the teflubenzuron treatment (χ2 = 22.9; df = 4; p < 0.001). In contrast, deutonymphs in the glyphosate treatment lasted longer than all but those whose mothers were treated with chlorantraniliprole (χ2 = 28.6; df = 4; p <0.001). Despite the statistical differences observed in the duration of each immature stage, the total development time (egg–adult) was similar for all treatments (χ2 = 8.1, df = 4; p = 0.09).

3.2.2. Reproductive Parameters and Adult Longevities

The pre-oviposition times were relatively longer for the offspring of females treated with chlorantraniliprole and teflubenzuron, though not significantly different than the glyphosate and control treatments (Table 4). The oviposition period was shorter for chlorantraniliprole, which was statistically different from the control but similar to flubendiamide, glyphosate, and teflubenzuron (χ2 = 14.9; df = 4; p = 0.004). However, the post-oviposition time had no difference among the treatments (χ2 = 6.1; df = 4; p = 0.188).
The mean fecundity differed in females exposed to chlorantraniliprole, teflubenzuron, and glyphosate from those exposed to flubendiamide and control (χ2 = 31.9; df = 4, p = < 0.001). However, no significant differences among treatments were observed in daily oviposition (χ2 = 6.5; df = 4; p = 0.164) (Table 4).
Newly emerged and mated females showed oviposition peaks between Days 3 and 12 after emergence. Higher oviposition peaks were observed in the control and flubendiamide treatments (Figure 1). In the control treatment, mortality of adult females occurred beginning with Day 8 and increased progressively until the last adult died on Day 20. Females in the other treatments showed gradual mortality between the second and third days after emergence. In the control treatment, the mean daily oviposition increased progressively from the second day onward, reaching the highest peak on the sixth day after emergence. The mean longevity of adult females did not differ statistically among treatments (χ2 = 5.7; df = 4; p = 0.220). In contrast, adult males had longer lifespans in the glyphosate treatment than the control, which did not statistically differ from chlorantraniliprole, flubendiamide, and teflubenzuron (χ2 = 12.4; df = 4; p = 0.014).

3.2.3. Population Growth Parameters

The net reproductive rate (R0) of N. idaeus was considerably higher in the flubendiamide and control treatments, with a projected increase of 8–9 times in each generation, respectively (Table 5). The intrinsic growth rate (rm), which represents the population growth rate based on the daily number of females generated by females, was affected by chlorantraniliprole, glyphosate, and teflubenzuron. The finite increase rate (λ) indicates the ratio of population growth of N. idaeus, which in this case did not differ statistically among treatments. Finally, the mean generation time (T) was longer in the chlorantraniliprole, glyphosate, and teflubenzuron treatments, which were statistically different from flubendiamide.

3.2.4. Age–Stage Survival Rate

The probability of emergence/hatching and survivability of each of the stages of N. idaeus after contact with pesticides was estimated by the age–stage survival rate (Sxj), which represents the probability of a newborn individual surviving to age x at stage j (Figure 2).
Consistent with results of the survival of the different mite stages (Section 3.2.1), the estimated projection in the graph Sxj showed that the survival curves also indicated a lower survival rate in the egg and deutonymph stages of the offspring of the females treated with chlorantraniliprole and teflubenzuron, respectively. In all treatments, the overlapping stages indicated that hatching/emergence rates varied among individuals at each stage of development.

3.3. Egg Viability

The viability of eggs produced in the parental generation (F0) by females treated with chlorantraniliprole was 42%, representing a significant decrease compared with other treatment groups (χ2 = 105.63; p < 0.001). However, for all treatments, the eggs generated by the maternal (F1) generation had high viability (Table 6), with no statistical differences among treatments (χ2 = 9.09; p = 0.059).

3.4. IOBC Sublethal Toxicity Classification

The IOBC-WPRS determines the physiological selectivity of the pesticides on the basis of lethal and sublethal effects of bioassays under laboratory conditions. The results of these studies are then used to determine application rates in production settings. In this case, the pesticides flubendiamide, glyphosate, and teflubenzuron were classified as harmless (Class 1: E < 25%; Table 7). Only chlorantraniliprole was classified as moderately harmful (Class 3: 25% ≤ E ≤ 50%).

3.5. Morphological Characteristics of the Stages

Although the morphological characteristics of N. idaeus were not compared statistically, we provide information on morphology to describe the development cycle and biology of the predator. Eggs of N. idaeus are elliptical, with a smooth translucent chorion (Figure 3A). Larvae are opaque white and move slowly (Figure 3B). In all treatments, the larvae did not feed on any of the immature stages of T. urticae. The protonymphs are more agile and constantly seek their prey, maintaining the coloration of the larval stages (Figure 3C). The pale-yellow deutonymphs also search actively for their prey (Figure 3D). Adult males and females are pale yellow (Figure 3E,F); females are larger and have a pyriform body, while males are smaller and have a flatter body.

4. Discussion

Several studies have determined the lethal and sublethal effects of pesticides on predatory mites to evaluate their compatibility for inclusion in integrated pest management programs. Such studies reduce ecological and environmental risks and the consequences to agricultural systems. Here, we observed that the acute toxicity of pesticides to N. idaeus was highest for acephate and for imidacloprid and bifenthrin, causing mortality of 100%, and for thiamethoxam and lambda-cyhalothrin, causing mortality of 75%. On the basis of the highly toxic effects on the predator, we do not recommend their use in the field without studies in semi-field and field conditions.
The toxic effects of acephate on natural enemies of pests are well known. Studies by Mochizuki [60] on Amblyseius womersleyi Schicha, and by Ferla and Moraes [61] on Euseius concordis (Chant) and Neoseiulus anonymus Denmark & Muma (all Phytoseiidae) showed that this insecticide is harmful. Silva et al. [62] described a similar effect on two Brazilian populations of E. concordis. In addition to phytoseiid predators, acephate was also classified as harmful to Cosmolaelaps sabelisi (Laelapidae) [63]. Mixtures of neonicotinoids and pyrethroids may have a higher risk of toxicity to natural enemies because of the possible synergistic effect [64,65]. This phenomenon occurs when combining modes of action, by additive or potentiation effects [66,67] because, while pyrethroids act by blocking sodium ions in the presynaptic membrane [68,69,70], neonicotinoids act as antagonists of acetylcholine receptors on the postsynaptic neuron [71,72,73]. Both types of compounds cause neuron overexcitation, muscle exhaustion, paralysis, and death in exposed individuals. Therefore, on the basis of the mortality of N. idaeus females, the ready-mix pesticides were classified, using IOBC toxicity categories, from highest to lowest as: acetamiprid and fenpropathrin > acetamiprid and alpha-cypermethrin = thiamethoxam and lambda-cyhalothrin > imidacloprid and bifenthrin.
When females of N. idaeus were treated with a methoxyfenozide and spinetoram mixture, the effects on mortality were less significant than with the other mixtures. The effects of diacylhydrazine in mixtures with spinosyn on predatory mites have not been studied. However, the two compounds act specifically in combination. Methoxyfenozide accelerates molting, binding to the ecdysone receptor [74]. Therefore, the action of diacylhydrazine is expected to be more evident in immature stages than in adults, as suggested by several studies that affirmed its innocuity [75,76,77,78,79,80,81,82]. In contrast, the spinosyn-based insecticides can also be neurotoxic, acting by contact or ingestion [83], and harmful effects on natural enemies are more evident when they are ingested [84]. For example, higher mortality rates were observed in females of C. sabelisi (Laelapidae) when they ingested a mixture of Rabidtella axey (Nematoda) contaminated with spinosyn residues at a dose recommended for controlling thrips [63]. Driesche et al. [85] found similar effects on Neoseiulus cucumeris (Oudemans) and Iphiseius degenerans (Berlese) (Phytoseiidae). After contact with three different doses of spinosad, a population of Typhlodromus (Typhlodromus) pyri Scheuten (Phytoseiidae) was significantly affected, with high total mortality rates [86].
In this study, chlorfenapyr caused 53% mortality and was classified as moderately harmful. Although this insecticide caused significant mortality in females of N. idaeus, other species of Phytoseiidae have shown higher tolerance. The acute toxicity of any insecticide to non-target organisms will depend on the dose and detoxification capacity of an individual. For example, Cloyd et al. [87] tested three different chlorfenapyr doses on females of Phytoseiulus persimilis Athias-Henriot (Phytoseiidae) and observed that mortality rates reached 100% on the seventh day of evaluation, while females of Neoseiulus californicus McGregor (Phytoseiidae), G. aculeifer, and Stratiolaelaps miles (Berlese) (Laelapidae) treated under similar conditions were less affected. Indoxacarb caused 29% mortality and was considered moderately harmful. Indoxacarb is a neurotoxin and a sodium channel blocker; in most studies, contact-exposed predatory mites have shown little sensitivity. For example, Bostanian et al. [88] reported that females of Neoseiulus fallacis (Garman) (Phytoseiidae) exposed to 0.05 g A.I. L−1 of indoxacarb showed high survival after 72 hours. Likewise, Bostanian et al. [89] found that three doses of indoxacarb (0.05, 0.114, and 0.228 g of a.i. L–1) were harmless to N. fallacis and P. persimilis under laboratory conditions.
Although chlorantraniliprole did not cause significant mortality in females exposed to residues, the progeny showed sublethal effects, mainly a 56% reduction in survival of immatures. This high mortality of immature stages affected the sex ratio, resulting in similar numbers of males and females generated. Although there was a strong trend, the effect on the pre-oviposition period of newly emerged females and the considerable reductions in fecundity and daily oviposition were not statistically significant. Thus, we suggest that effects on reproductive parameters are due to infertility of females and males. In addition to our study, Khan et al. [90] reported that the development and reproduction of Paederus fuscipes (Staphylinidae: Coleoptera) were affected after the beetles were exposed to chlorantraniliprole. Nawaz et al. [91] found that the second and fourth-instar larval and pupal stages of Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) were prolonged when treated with LC10 (2.42 mg of a.i. L−1) and LC30 (12.06 mg of a.i. L−1) doses of chlorantraniliprole, and the fecundity and longevity of adult females were also reduced. However, many other studies have concluded that this insecticide is safe for other natural enemies, including predatory arthropods [81,92,93,94,95,96,97].
Females treated with teflubenzuron showed a 34% reduction in survival of immatures, although this was not statistically significant. The mean fecundity and daily oviposition rate (eggs/female/day) were both statistically lower. Souza et al. [98] found that the reduction in larval hatching and adult emergence of the predator Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae) was one of the most evident sublethal effects caused by teflubenzuron. Another interesting sublethal effect was reported by Pérez-Aguilar et al. [99]: the offspring of females of Engytatus varians (Heteroptera: Miridae) derived from nymphs treated with teflubenzuron were significantly smaller than the offspring from the control treatment. These authors also reported higher survival rates of nymphs from the offspring of adult females that had been treated with this insecticide. In addition to these effects, teflubenzuron reduced the feeding activity of the predator Orius insidiosus (Say) (Hemiptera: Anthocoridae) [100], as well as the predation rate of Orius laevigatus (Fieber) (Hemiptera: Anthocoridae) [101]. Teflubenzuron is an insect growth regulator of the benzoylurea group, which inhibits chitin synthesis and is used mainly to control lepidopteran larvae [102]. In this case, ingestion and contact with particles of this insecticide by predatory insects and mites can cause problems related to the effects on immature stages. For that reason, the mortality rate for N. idaeus was significantly higher in the offspring than in the adult females.
Flubendiamide did not cause significant lethal effects on exposed adult females. However, the eggs generated by these females hatched more quickly than eggs from the control females. In this case, even though there was a statistical difference in the duration of the egg phase, the observed effects can be ascribed to chance, particularly as such effects have not been reported for other arthropods exposed to flubendiamide under the conditions used in our study. Furthermore, the fecundity of the progeny was lower compared with the control. These effects are a consequence of oocyte maturation, regulated by the juvenile hormone and the molting hormone, both of which also play essential roles in the reproduction of mites and, in this case, may have had negative effects on reproduction. Similar effects were observed in the progeny of females treated with glyphosate, but in this case, the reason for the effects on predatory mites is unknown. However, evidence indicates that glyphosate induces oxidative stress through lipid peroxidation of antioxidant defenses, reducing immunity in many organisms, including arthropods [103,104,105]. Here, this oxidative stress may be related to the reduction in the offspring of females treated with glyphosate, an hypothesis that needs further investigation.
Life tables summarize the population characteristics of a species whose development, fecundity, survival rate, and population growth respond to environmental or biotic factors. In this case, two-sex life tables provide the growth trend of the N. idaeus population on the basis of the sublethal effects observed during its development and reproduction. The life table parameters indicated better growth and stability projections for the offspring of mites exposed to flubendiamide, similar to the control treatment. In this case, the net reproductive rate (R0) calculated for offspring (F1) females treated with flubendiamide indicated that each female of N. idaeus produced 7.90 females generated by females every 16.45 days (T), with daily population growth (λ) of 1.13% for a daily production of 0.127 females/female/day (rm). In the chlorantraniliprole and teflubenzuron treatments, the instantaneous population growth rates were very low, indicating that the populations in these treatments were very close to the rate of decline, due to the lower density of predators produced because of the negative reproductive effects.
As with chlorantraniliprole, teflubenzuron appears to have lower toxicity to a range of non-target organisms compared with the broad-spectrum pesticides reported here. Chlorantraniliprole and flubendiamine are anthranilic and phthalic diamides, respectively, and function by activating ryanodine receptors, leading to the uncontrolled release of calcium from intracellular stores [106]. Although these compounds act in a similar way in organisms that come into contact with or ingest their molecules, their sublethal effects on predatory mites differed. While chlorantraniliprole was classified as moderately harmful, flubendiamine was classified as harmless. The sublethal effects of chlorantraniliprole were driven by the high mortality in the immature stage, which most likely occurred because this systemic insecticide may have persisted longer than flubendiamide on the treated leaf discs, thus increasing the exposure time of the mites.

5. Conclusions

Based on all the effects evaluated under laboratory conditions, the pesticides compatible with the predatory mite were flubendiamide, glyphosate, and teflubenzuron. Studies in semi-field and field conditions are encouraged to evaluate the impact of insecticides that were not classified as compatible here since their interaction with abiotic factors can result in weaker responses than those observed under laboratory conditions. In addition, compatible pesticides for N. idaeus must be evaluated regarding their risk to the many other natural enemies and pollinators associated with soybean crops in Brazil.

Author Contributions

G.B., P.T.Y. and L.L.G. conceived and designed the research; G.B., L.L.G., M.Y. and E.D.R.S. conducted experiments and collected the data; G.B., F.H.I.F., J.d.B.P. and L.V.d.Q.O. analyzed the data; G.B. and L.L.G. wrote the manuscript; G.B., L.L.G., F.H.I.F., M.Y., E.D.R.S., J.d.B.P., L.V.d.Q.O. and P.T.Y. contributed to the interpretation of results and overall improvement of the manuscript. All authors commented on previous versions of the manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

Funding was provided by the Fundação de Amparo à Pesquisa do Estado de São Paulo for L.L.G. (2020/15134-6), F.H.I.F. (2019/26145-1), and J.dB.P. (2019/26099-0) and by the São Paulo Advanced Research Center for Biological Control/ FAPESP and Koppert Biological Systems for P.T.Y. (2018/02317-5).

Data Availability Statement

The data presented in this study are available on request from the corresponding author.

Acknowledgments

We would like to thank Hsin Chi from National Chung Hsing University in Taiwan for help with the Age–Stage, two-sex life table Software. We thank Janet W. Reid for help with manuscript editing and proofreading. We thank José Bruno Malaquias from the Entomology Laboratory, Center for Agrarian Sciences, Federal University of Paraíba, Areia, Brazil, for valuable suggestions on statistical analyses. Thanks to Marcelo Poletti, C.O. of the Promip Manejo Integrado de Pragas, for help with the initial colony of Tetranychus urticae. Thanks to the reviewers for their valuable suggestions.

Conflicts of Interest

The authors declare that they have no competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Figure 1. Mean of eggs/female/day and survival probability of females of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Figure 1. Mean of eggs/female/day and survival probability of females of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
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Figure 2. Age–stage-specific survival rate (Sxj) of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Figure 2. Age–stage-specific survival rate (Sxj) of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
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Figure 3. Life stages of immatures and adults of the predatory mite Neoseiulus idaeus. (A) eggs; (B) larva; (C) protonymph; (D) deutonymph; (E) adult female; and (F) adult male.
Figure 3. Life stages of immatures and adults of the predatory mite Neoseiulus idaeus. (A) eggs; (B) larva; (C) protonymph; (D) deutonymph; (E) adult female; and (F) adult male.
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Table 1. Common pesticides used to control weeds and pests in Brazilian soybean fields.
Table 1. Common pesticides used to control weeds and pests in Brazilian soybean fields.
Active IngredientTrade NameChemical GroupConcentration
(g or mL. L–1)
I.A. *C.P. **
AcephateOrthene® 75 SP, UPL Brazil, Ituverava, SP, Brazil.Organophosphate2.503.20
Acetamiprid and fenpropathrinBold® EW, Iharabras S.A. Sorocaba, SP, BrazilNeonicotinoid and pyrethroid0.24 + 0.363.20
Acetamiprid and alpha-cypermethrinFastac Duo® 40 SC, BASF S.A., São Paulo, SP, Brazil.Neonicotinoid and pyrethroid0.32 + 0.643.20
ChlorantraniliprolePremio 20 SC, FMC LTDA, Campinas, SP, Brazil.Anthranilic diamide0.643.20
ChlorfenapyrPirate 24 SC, BASF S.A., São Paulo, SP, Brazil.Pyrazole analog1.928.00
FlubendiamideBelt® 48 SC, Bayer S.A., São Paulo, SP, Brazil.Phthalic acid diamide1.683.50
GlyphosateRoundup Ultra® SL, Monsanto LTDA, São Paulo, SP, Brazil.Ammonium-salt glyphosate2.523.50
Imidacloprid and bifenthrinGalil® 25 SC, ADAMA SA, Londrina, PR, Brazil.Neonicotinoid and pyrethroid0.10 + 0.020.40
IndoxacarbAvatar® 15 SC, FMC LTDA, Campinas, SP, Brazil.Oxadiazine0.181.20
Methoxyfenozide and spinetoramIntrepid® Edge SC, Dow AgroSciences, Barueri, SP, Brazil.Diacylhydrazine and spinosyn0.90 + 0.183.00
TeflubenzuronNomolt® 15 SC, BASF S.A., São Paulo, SP, Brazil.Benzoylurea0.221.5
Thiamethoxam and lambda-cyhalothrinEngeo Pleno® SC, Syngenta LTDA, São Paulo, SP, Brazil.Pyrethroid and neonicotinoid0.14 + 0.101.00
* Corresponds to the concentration for the Active Ingredient (I.A.). ** Corresponds to the concentration for the Commercial Product (C.P.).
Table 2. Mortality rate ± standard error (SE) and confidence intervals (CI) of Neoseiulus idaeus females 24 and 48 h after contact with pesticide residues on soybean leaves, corrected mortality (Cm) after 48 h, and IOBC-WPRS classification of pesticides.
Table 2. Mortality rate ± standard error (SE) and confidence intervals (CI) of Neoseiulus idaeus females 24 and 48 h after contact with pesticide residues on soybean leaves, corrected mortality (Cm) after 48 h, and IOBC-WPRS classification of pesticides.
PesticideMortality
24 h48 hCm (%) ¹Class 2
MeanSECIMeanSECI
Control10.00.06(03.0–33.0) b15.00.08(05.0–38.0) cd
Acephate1000.00(0.0–0.0) *1000.00(00.0–00.0) *1004
Acetamiprid and fenpropathrin45.00.11(26.0–67.0) ab50.00.11(30.0–71.0) bcd412
Acetamiprid and alpha-cypermethrin40.00.11(22.0–63.0) ab65.00.10(43.0–83.0) bc593
Chlorantraniliprole5.00.05(01.0–29.0) b15.00.08(05.0–38.0) cd01
Chlorfenapyr55.00.11(34.0–65.0) ab60.00.11(38.0–79.0) bcd533
Flubendiamide5.00.05(01.0–29.0) b15.00.08(05.0–38.0) cd01
Glyphosate5.00.05(01.0–29.0) b20.00.09(08.0–43.0) abcd61
Imidacloprid and bifenthrin65.00.10(43.0–83.0) a90.00.06(68.0–98.0) b884
Indoxacarb30.00.10(15.0–53.0) ab40.00.11(22.0–63.0) bcd292
Methoxyfenozide and spinetoram10.00.06(03.0–23.0) b35.00.10(18.0–58.0) abcd241
Teflubenzuron5.00.05(01.0–29.0) b10.00.06(03.0–33.0) d01
Thiamethoxam and lambda-cyhalothrin60.00.11(38.0–79.0) ab70.00.10(48.0–86.0) ab653
χ267.2469.29
p-value<0.00001<0.00001
Means followed by the same letter in a column do not differ significantly by contrasts from binomial generalized linear model; p ≤ 0.05. * Treatments excluded from the analysis since there was no variability. 1 Corrected mortality (Cm) by the Abbott formula. 2 Toxicological class according to IOBC-WPRS in which Class 1 = harmless (Cm < 25%); Class 2 = slightly harmful (25 ≤ Cm ≤ 50%); Class 3 = moderately harmful (51 ≤ Cm ≤ 75%); and Class 4 = harmful (Cm > 75%).
Table 3. Mean duration of the different developmental stages ± SE (% survival) of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Table 3. Mean duration of the different developmental stages ± SE (% survival) of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Developmental StageControlChlorantraniliproleFlubendiamideGlyphosateTeflubenzuron
Egg1.8 ± 0.2 a (100)1.5 ± 0.2 a (69) *1.1 ± 0.2 b (100)1.8 ± 0.3 a (100)1.6 ± 0.2 a (98)
Larva0.7 ± 0.1 ab (100)0.9 ± 0.2 a (91)0.8 ± 0.1 b (100)0.7 ± 0.1 ab (100)0.6 ± 0.1 a (100)
Protonymph1.6 ± 0.3 b (100)1.8 ± 0.4 b (80)1.8 ± 0.3 b (100)1.5 ± 0.2 b (86)2.2 ± 0.4 a (76)
Deutonymph1.7 ± 0.3 b (98)2.0 ± 0.4 ab (84)1.7 ± 0.3 b (96) 2.2 ± 0.4 a (86)1.7 ± 0.2 b (86)
Egg–Adult5.5 ± 0.9 a (98)5.1 ± 1.2 a (42) *5.5 ± 1.0 a (94)6.0 ± 1.0 a (74)5.4 ± 1.0 a (64) *
In each row, means followed by the same letter are not significantly different (post hoc test using Dunn’s test with Bonferroni correction or paired bootstrap test, p > 0.05). * Statistically significant difference in survival compared with control by paired bootstrap test, p < 0.05.
Table 4. Mean (±SE) of pre-oviposition, oviposition, and post-oviposition periods (days), fecundity (eggs per female), eggs/female/day, and longevity of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Table 4. Mean (±SE) of pre-oviposition, oviposition, and post-oviposition periods (days), fecundity (eggs per female), eggs/female/day, and longevity of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Biological ParameterControlChlorantraniliproleFlubendiamideGlyphosateTeflubenzuron
Pre-oviposition a1.6 ± 0.3 ab3.6 ± 1.1 a0.9 ± 0.2 b2.7 ± 0.5 ab3.2 ± 0.7 a
Oviposition a11.0 ± 2.6 a6.4 ± 1.6 b7.4 ± 1.7 ab8.3 ± 1.6 ab6.9 ± 1.4 ab
Post-oviposition a4.6 ± 1.0 a2.9 ± 0.9 a3.1 ± 0.7 a1.9 ± 0.4 a3.6 ± 0.8 a
Total fecundity b39251324227128
Mean fecundity a17.9 ± 1.8 a5.5 ± 2.1 b16.5 ± 2.4 a8.5 ± 1.0 b6.1 ± 1.0 b
Eggs/female/day a1.2 ± 0.2 a0.5 ± 0.1 a0.8 ± 0.2 a0.7 ± 0.1 a0.5 ± 0.1 a
Sex ratio0.760.480.690.720.68
♀ Longevity a12.0 ± 0.5 a12.6 ± 1.0 a 11.6 ± 0.7 a13.2 ± 0.5 a12.4 ± 0.7 a
♂ Longevity a7.4 ± 0.3 b8.4 ± 0.4 ab8.8 ± 0.4 ab9.3 ± 0.3 a8.4 ± 0.3 ab
Number of ♀ c2610 222621
Number of ♂ c811101010
a In each row, means followed by the same letter are not significantly different (Dunn’s test with Bonferroni correction or paired bootstrap test, p > 0.05). b Equivalent to the sum of daily oviposition. (Bonferroni t-test) or paired bootstrap test, p > 0.05. c Number of parental eggs.
Table 5. Life table parameters ± SE of the parental generation of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Table 5. Life table parameters ± SE of the parental generation of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Life Table ParameterControlChlorantraniliproleFlubendiamideGlyphosateTeflubenzuron
Ro8.91 ± 1.49 a1.04 ± 0.50 d7.90 ± 1.55 a4.40 ± 0.78 b2.56 ± 0.58 c
T16.93 ± 2.52 ab20.12 ± 2.87 a16.45 ± 2.57 b20.04 ± 2.83 a19.28 ± 2.72 a
λ1.14 ± 0.16 a1.00 ± 0.42 a1.13 ± 0.17 a1.08 ± 0.49 a1.05 ± 0.18 a
rm0.129 ± 0.019 a0.091 ± 0.013 b0.127 ± 0.020 a0.074 ± 0.010 c0.049 ± 0.006 d
Ro: net reproduction rate (offspring/individual); rm: intrinsic rate of increase (day–1); λ: finite rate of increase (day–1); T: mean generation time (days). In each row, means followed by the same letter are not significantly different (paired bootstrap test, p > 0.05).
Table 6. Mean egg viability ± SE and (CI) of the parental generation (F0) and offspring (F1) of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Table 6. Mean egg viability ± SE and (CI) of the parental generation (F0) and offspring (F1) of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
PesticideParental Generation (F0)Maternal Generation (F1)
MeanSECIMeanSECI
Control1000.00(0.0–0.0) *96.00.02(85.0–99.0) a
Chlorantraniliprole42.00.07(29.0–56.0) b1000.00(0.0–0.0) *
Flubendiamide1000.00(0.0–0.0) *1000.00(0.0–0.0) *
Glyphosate1000.00(0.0–0.0) *98.00.02(87.0–99.0) a
Teflubenzuron98.00.02(87.0–99.0) a92.00.03(80.0–96.0) a
χ2105.639.09
p-value<0.0010.059
Means followed by the same letter in a column do not differ significantly by contrasts from binomial generalized linear model; p ≤ 0.05. * Treatments excluded from the analysis since there was no variability.
Table 7. Sublethal effects on the parental generation (F0) of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Table 7. Sublethal effects on the parental generation (F0) of Neoseiulus idaeus after contact with residues of pesticides used on soybean crops, at 25 ± 1 °C, 75 ± 10% RH, and 12 h photoperiod.
Pesticide* Cm (%)ErE%Class 1
Chlorantraniliprole0.00.4593
Flubendiamide9.01.091
Glyphosate0.01.001
Teflubenzuron0.01.021
* Cm, corrected mortality (Abbott 1925). Er, effect on reproduction. E%, total effect, E% 100 – (100 – Cm) × Er. ¹ Toxicological class according to IOBC-WPRS in which Class 1 = harmless (E% < 25%); Class 2 = slightly harmful (25 ≤ E% ≤ 50%); Class 3 = moderately harmful (50% ≤ E% ≤ 75%); and Class 4 = harmful (E% > 75%).
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Barroso, G.; Godoy, L.L.; Iost Filho, F.H.; Yamada, M.; Santana, E.D.R.; Pazini, J.d.B.; de Queiroz Oliveira, L.V.; Yamamoto, P.T. Predator-Unfriendly Pesticides Harm the Beneficial Mite Neoseiulus idaeus Denmark & Muma (Acari: Phytoseiidae). Agronomy 2023, 13, 1061. https://doi.org/10.3390/agronomy13041061

AMA Style

Barroso G, Godoy LL, Iost Filho FH, Yamada M, Santana EDR, Pazini JdB, de Queiroz Oliveira LV, Yamamoto PT. Predator-Unfriendly Pesticides Harm the Beneficial Mite Neoseiulus idaeus Denmark & Muma (Acari: Phytoseiidae). Agronomy. 2023; 13(4):1061. https://doi.org/10.3390/agronomy13041061

Chicago/Turabian Style

Barroso, Geovanny, Lucas Lorena Godoy, Fernando Henrique Iost Filho, Mariana Yamada, Emile Dayara Rabelo Santana, Juliano de Bastos Pazini, Luana Vitória de Queiroz Oliveira, and Pedro Takao Yamamoto. 2023. "Predator-Unfriendly Pesticides Harm the Beneficial Mite Neoseiulus idaeus Denmark & Muma (Acari: Phytoseiidae)" Agronomy 13, no. 4: 1061. https://doi.org/10.3390/agronomy13041061

APA Style

Barroso, G., Godoy, L. L., Iost Filho, F. H., Yamada, M., Santana, E. D. R., Pazini, J. d. B., de Queiroz Oliveira, L. V., & Yamamoto, P. T. (2023). Predator-Unfriendly Pesticides Harm the Beneficial Mite Neoseiulus idaeus Denmark & Muma (Acari: Phytoseiidae). Agronomy, 13(4), 1061. https://doi.org/10.3390/agronomy13041061

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