The 15th Anniversary of Insects—Advances in Insect Pest and Vector Management

A special issue of Insects (ISSN 2075-4450). This special issue belongs to the section "Insect Pest and Vector Management".

Deadline for manuscript submissions: closed (31 December 2025) | Viewed by 9315

Special Issue Editor


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Guest Editor
Department of Entomology, Institute of Plant Protection (IPP), Chinese Academy of Agricultural Sciences (CAAS), 2# West Yuan Ming Yuan Road, Haidian District, Beijing 100193, China
Interests: integrated pest management; potato entomology; invasive species; interspecific competition; insecticide resistance management; biological control; pesticides; insect ecology; insect-plant interactions; transgenic Bt crops; non-target effects

Special Issue Information

Dear Colleagues,

We warmly invite you to contribute high-quality manuscripts on insect pest and vector management to this Special Issue titled “The 15th Anniversary of Insects—Advances in Insect Pest and Vector Management”. This Special Issue will be published in celebration of the 15th anniversary of Insects, and all accepted papers will be included in a commemorative book.

We welcome submissions focused on the development of tools and methodologies for the management of arthropod pests, including vectors of pathogens. Studies addressing pest management across various crops and commodities are encouraged, including those related to agriculture, forestry, urban environments, stored products, and pests of medical or veterinary importance. Mechanistic studies that clarify innovative interventions or investigate interactions between pests and the environment are also highly encouraged.

Prof. Dr. Yulin Gao
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Insects is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • monitoring
  • pest ecology
  • insect toxicology
  • biological control
  • pesticides
  • integrated pest management
  • arthropod–pathogen interactions
  • insect–plant interactions
  • predator–prey interactions
  • pesticide resistance

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Published Papers (11 papers)

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Research

20 pages, 5138 KB  
Article
Genome-Wide Identification and Comparative Characterization of Chemosensory Gene Families in Two Phthorimaea Pests
by Wangtao Hu, Ruipeng Chen, Qi Su and Yulin Gao
Insects 2026, 17(2), 178; https://doi.org/10.3390/insects17020178 - 6 Feb 2026
Viewed by 582
Abstract
Insects rely on their olfactory systems for host finding, mate choice, and oviposition. These odor-guided behaviors are mediated by the peripheral chemosensory system. The solanaceous pests Phthorimaea operculella and Phthorimaea absoluta cause severe damage to solanaceous crops worldwide. In this study, we aimed [...] Read more.
Insects rely on their olfactory systems for host finding, mate choice, and oviposition. These odor-guided behaviors are mediated by the peripheral chemosensory system. The solanaceous pests Phthorimaea operculella and Phthorimaea absoluta cause severe damage to solanaceous crops worldwide. In this study, we aimed to elucidate the olfactory molecular mechanisms of these two pests. We first screened and identified odorant-binding proteins (OBPs), chemosensory proteins (CSPs), and sensory neuron membrane proteins (SNMPs) from the genomes of P. operculella and P. absoluta. We then used RNA sequencing to characterize the tissue expression profiles of OBPs, CSPs, and SNMPs in P. operculella across developmental stages and adult chemosensory organs. From P. operculella, 47 OBPs, 26 CSPs, and 2 SNMPs were identified, and from P. absoluta, 39 OBPs, 24 CSPs, and 2 SNMPs were identified. RNA-seq-based expression profiling in P. operculella was used to resolve sex-biased deployment in antennae: DESeq2 analysis (|log2FC| > 1, FDR < 0.05) identified 24 OBPs and four CSPs with significant sexual dimorphism, with 14 OBPs and four CSPs upregulated in female antennae (FAn) and 10 OBPs and one CSP, together with SNMP2, upregulated in male antennae (MAn). In reproductive tissues (FOv vs. MGe), three OBPs and one CSP were enriched in the female ovipositor (FOv), whereas six OBPs and five CSPs were enriched in male genitalia (MGe), and no SNMPs met the differential-expression threshold. These candidate genes provide molecular entry points for functional studies and for developing behavior-based, environmentally compatible management strategies for P. operculella and P. absoluta. Full article
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19 pages, 2884 KB  
Article
Bedtime Story to My Mother: Virgin Females Seek Love
by Marc Rhainds
Insects 2026, 17(2), 146; https://doi.org/10.3390/insects17020146 - 27 Jan 2026
Viewed by 632
Abstract
The probability that female bagworms (Lepidoptera: Psychidae) are in mating time-in (live pheromone calling) was recorded in three bagworm species: Oiketicus kirbyi in a Costa Rican oil palm plantation in 1993–1994; Metisa plana in Malaysian oil palm plantations during five consecutive generations of [...] Read more.
The probability that female bagworms (Lepidoptera: Psychidae) are in mating time-in (live pheromone calling) was recorded in three bagworm species: Oiketicus kirbyi in a Costa Rican oil palm plantation in 1993–1994; Metisa plana in Malaysian oil palm plantations during five consecutive generations of bagworms in 1996; and Thyridopteryx ephemeraeformis on ornamental trees in the Midwest United States. Because females entirely reproduce within their bag (mate attraction, copulation, and oviposition), it is possible to assess the mating success of time-out females (dead individuals from an ongoing generation that either mated or died as a lifelong virgin) and incidence of calling females that may or may not mate before death. Synchronous larval development and discrete (non-overlapping) generations imply a declining proportion of live calling females over time in all three bagworm species: ‘young’ calling females prevail in the early season as opposed to a majority of time-out (post-reproductive) females in the late season. Calling females are long-lived relative to males (one-day lifespan) and thus expected to mate as adults when abundance of males is high and/or female longevity exceeds three days. A low mating success of calling females is associated with extreme protogyny (early season male shortage; O. kirbyi in 1994) or late adult emergence in populations at the edge of the distribution range (T. ephemeraeformis at latitudes > 41° N in 2019). Full article
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14 pages, 650 KB  
Article
Natural Products for the Control of Scaphoideus titanus in Vineyards: A Summary of Five-Year Field Trials
by Stefan Cristian Prazaru, Luigi Forlin, Leonardo Cera, Lisa D’Ambrogio, Alberto Pozzebon and Carlo Duso
Insects 2026, 17(1), 83; https://doi.org/10.3390/insects17010083 - 10 Jan 2026
Viewed by 687
Abstract
Scaphoideus titanus Ball, 1932 (Hemiptera: Cicadellidae), the main vector of the phytoplasma (FDp) causing Flavescence dorée, is considered a challenging problem in European vineyards. Natural insecticides permitted for S. titanus control in Italian organic viticulture are generally considered of low-to-moderate efficacy. Morever, it [...] Read more.
Scaphoideus titanus Ball, 1932 (Hemiptera: Cicadellidae), the main vector of the phytoplasma (FDp) causing Flavescence dorée, is considered a challenging problem in European vineyards. Natural insecticides permitted for S. titanus control in Italian organic viticulture are generally considered of low-to-moderate efficacy. Morever, it should be mentioned that their optimal use requires a careful approach when preparing the insecticide solutions. Synthetic insecticides used in Italian viticulture are included in only two IRAC groups, indicating potential risks for resistance. Therefore, there is a need to identify alternatives or control tools complementary to synthetic insecticides. In this study, we summarize the results obtained in five field experiments (2021–2025) using the main alternatives to synthetic insecticides (i.e., pyrethrins, kaolin, azadirachtin, Beauveria bassiana, and potassium salts of fatty acids). In all seasons, pre-insecticide application populations did not differ significantly among treatments, whereas differences emerged after insecticide applications. The overall results showed that pyrethrin-based insecticides were the most effective in reducing S. titanus nymph densities. Kaolin provided intermediate but comparatively stable levels of control across the years, whereas B. bassiana showed moderate yet highly variable efficacy. The findings obtained here can be considered in designing management strategies for S. titanus in organic viticulture that require an integrated approach combining pyrethrins with complementary, lower-impact tools to achieve effective and sustainable control over time. At the same time, natural insecticides can be incorporated into IPM strategies in conventional vineyards to prevent resistance. Full article
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16 pages, 1003 KB  
Article
Direct and Indirect Effects of a Glyphosate-Based Herbicide on Spodoptera frugiperda Multiple Nucleopolyhedrovirus (Baculoviridae) on Diet, Maize Plants and Soil
by Juan S. Gómez-Díaz, Arely Y. Cubas, Mara J. Arias-Robledo and Trevor Williams
Insects 2026, 17(1), 73; https://doi.org/10.3390/insects17010073 - 8 Jan 2026
Viewed by 532
Abstract
Glyphosate is a broad-spectrum, systemic herbicide that has attracted concern over its non-target effects, environmental persistence, and the presence of residues in food. The fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), is a major invasive pest of maize that can be controlled by application [...] Read more.
Glyphosate is a broad-spectrum, systemic herbicide that has attracted concern over its non-target effects, environmental persistence, and the presence of residues in food. The fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), is a major invasive pest of maize that can be controlled by application of its homologous nucleopolyhedrovirus (SfMNPV), an occluded virus in the family Baculoviridae. We examined the effects of a glyphosate-based herbicide on S. frugiperda growth and survival and on virus occlusion bodies (OBs) exposed to product label-recommended concentrations of the herbicide. Larval growth, time to pupation, pupal weight, duration of the pupal stage and sex ratio were not affected by exposure to the herbicide (1% v/v solution) applied to the surface of semi-synthetic diet. Exposure to 1–2% herbicide solution had no effect on the median lethal concentration (LC50) of OBs, the susceptibility of second instar larvae to virus infection, or the production of OBs in virus-killed larvae. Virus acquisition did not vary significantly when larvae fed on virus-sprayed maize plants at 1 and 6 days after they had been treated with herbicide, compared to healthy plants. Finally, the presence of 2% herbicide solution did not influence the persistence of OBs in non-sterilized soil samples over a 6-week greenhouse experiment. Although the laboratory and greenhouse experiments indicated that the glyphosate-based herbicide tested was unlikely to influence the transmission or persistence of SfMNPV OBs, future studies should verify these findings across a range of field conditions, soil types and different herbicide formulations. Full article
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18 pages, 1266 KB  
Article
A Tandem Metabarcoding and Taxonomic Forensics Approach to Surveillance of Mosquito–Plant Interactions for Culex quinquefasciatus in Florida
by Mba-Tihssommah Mosore, Shova Mishra, Milani Villa, Bright Agbodzi, Alden S. Estep, Agne Prasauskas, Whitney A. Qualls, Daniel Killingsworth, Isik Unlu, Miranda Tressler, Rhoel R. Dinglasan and Edwin R. Burgess IV
Insects 2026, 17(1), 13; https://doi.org/10.3390/insects17010013 - 22 Dec 2025
Viewed by 922
Abstract
Interactions with plants are an important aspect of mosquito vector biology and ecology because mosquitoes often use plants as nutritional resources. Plant DNA metabarcoding is a recent approach to address this topic. Culex quinquefasciatus is a vector of several important pathogens in Florida [...] Read more.
Interactions with plants are an important aspect of mosquito vector biology and ecology because mosquitoes often use plants as nutritional resources. Plant DNA metabarcoding is a recent approach to address this topic. Culex quinquefasciatus is a vector of several important pathogens in Florida and is subject to significant control efforts, but no studies to date have explored what plants they may feed on. We addressed this by conducting a statewide collection of Cx. quinquefasciatus from six Florida counties and subjected them to plant DNA metabarcoding and cross-referenced the identified plants to a Florida state plant voucher database for each sampled county. A total of 30 families and 47 genera were identified. Plants included many that are cultivated and non-cultivated in Florida, including backyard garden produce, grasses, and some invasive species. Concurrence of plant families and genera was generally high in the respective sampled counties based on available plant vouchers. These data provide the first statewide survey of plants associated with Cx. quinquefasciatus in Florida. This information serves as an important basis for confirming plant taxa that are important to Cx. quinquefasciatus, which could translate to the development of better control strategies and tools. Full article
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13 pages, 643 KB  
Article
Biology of Chrysoperla comanche (Neuroptera: Chrysopidae)—Should This Predator Be Considered for Insectary Production?
by Kent M. Daane
Insects 2025, 16(12), 1235; https://doi.org/10.3390/insects16121235 - 6 Dec 2025
Viewed by 754
Abstract
The immature development, larval food consumption, and adult fecundity of Chrysoperla comanche (Banks), as a predator of the leafhopper Erasmoneura variabilis (Beamer), were determined. The threshold temperatures of egg, first, second, and third instars, and pupal stages were 10.6, 12.9, 11.5, 10.3, and [...] Read more.
The immature development, larval food consumption, and adult fecundity of Chrysoperla comanche (Banks), as a predator of the leafhopper Erasmoneura variabilis (Beamer), were determined. The threshold temperatures of egg, first, second, and third instars, and pupal stages were 10.6, 12.9, 11.5, 10.3, and 11.0 °C, respectively, and their corresponding accumulated degree days (DDs) were 73.5, 38.5, 37.4, 44.3 and 140.4 DD. When placed in an outdoor cage, field-collected adults continued to deposit eggs during the winter months. The weight of 3 d-old cocoons was negatively related to temperature, indicating that cocoon weights decrease as temperatures near the lethal thresholds. Larvae consumed ~250 late instar E. variabilis. At 26.7 °C. Adults had an average pre-ovipositional period of 5.8 days and produced an average of 1108 eggs over their entire life of 53.6 days, with 77.3% (857 eggs) of eggs produced in the first 30 days of reproduction. The results are discussed with respect to the application and commercial production of C. comanche in biological control programs, as well as the feasibility of insectaries to produce specialty natural enemies. Full article
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20 pages, 1600 KB  
Article
Chlorantraniliprole Resistance and Associated Fitness Costs in Fall Armyworm (Spodoptera frugiperda): Implications for Resistance Management
by Arzlan Abbas, Faisal Hafeez, Ali Hasnain, Ayesha Iftikhar, Muhammad Hassan Khan, Farman Ullah, Ahmed M. M. Elkady, Chen Ri Zhao and Xiaohe Sun
Insects 2025, 16(12), 1232; https://doi.org/10.3390/insects16121232 - 6 Dec 2025
Cited by 2 | Viewed by 901
Abstract
Spodoptera frugiperda J.E. Smith (Lepidoptera: Noctuidae) represents a major threat to maize production across Pakistan, with chemical control serving as the predominant management approach. The intensive application of insecticides, particularly diamide compounds such as chlorantraniliprole, has escalated concerns regarding resistance evolution in field [...] Read more.
Spodoptera frugiperda J.E. Smith (Lepidoptera: Noctuidae) represents a major threat to maize production across Pakistan, with chemical control serving as the predominant management approach. The intensive application of insecticides, particularly diamide compounds such as chlorantraniliprole, has escalated concerns regarding resistance evolution in field populations. This study evaluated the insecticidal efficacy of seven commonly used compounds against geographically diverse field-collected populations of S. frugiperda from major maize-growing regions of Pakistan, revealing significant inter-population variability in susceptibility profiles. Chlorantraniliprole was selected for comprehensive transgenerational screening based on moderate baseline LC50 values and optimal laboratory colony establishment parameters. A representative field strain underwent six consecutive generations of selection pressure at LC70 concentrations, resulting in a 4.48-fold increase in resistance levels with a realized heritability (h2) of 0.198. Predictive modeling using established quantitative genetic frameworks demonstrated that resistance evolution rates are critically dependent on both selection intensity and genetic parameters. Under constant h2 = 0.198, increasing selection intensity substantially accelerated resistance development, with 10-fold resistance achievable in approximately 18 generations at 80% selection intensity (slope = 2.696) compared to 36 generations at lower intensities (slope = 4.696). Sensitivity analysis revealed that heritability variations from 0.148 to 0.248 could reduce generation requirements from >40 to ~25 generations when slope was maintained at 3.696. Life table analyses of the chlorantraniliprole-selected strain demonstrated significant fitness costs manifested as extended developmental periods, reduced reproductive output, and decreased intrinsic rate of population increase (r), indicating evolutionary trade-offs associated with resistance acquisition. These findings provide crucial insights for developing sustainable management strategies, highlighting the importance of integrating resistance monitoring, refuge-based approaches, and rotation with insecticides of different modes of action to delay resistance buildup in field populations. Such data-driven management frameworks are vital for maintaining the long-term efficacy of diamides in Pakistan’s maize production systems. Full article
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12 pages, 2177 KB  
Article
Diversity and Seasonal Dynamics of Stored-Product Insects in a Feed Manufacturing Facility in Greece
by Evagelia Lampiri, Paraskevi Agrafioti, Efstathios Kaloudis, Dimitrios Kateris and Christos G. Athanassiou
Insects 2025, 16(12), 1209; https://doi.org/10.3390/insects16121209 - 27 Nov 2025
Viewed by 978
Abstract
The present study aimed to document the diversity and seasonal dynamics of stored-product insects in an animal feed facility located in northern Greece. A total of 38 traps were installed across different operational areas of the facility and inspected over 51 consecutive sampling [...] Read more.
The present study aimed to document the diversity and seasonal dynamics of stored-product insects in an animal feed facility located in northern Greece. A total of 38 traps were installed across different operational areas of the facility and inspected over 51 consecutive sampling occasions. Captured insects were identified to the lowest possible taxonomic level, and their frequency and dominance were calculated. In total, 9047 insect species belonging to five orders, 14 families, and at least 18 insect species were recorded. The dominant species were Tribolium castaneum, T. confusum, Oryzaephilus surinamensis, Sitophilus granarius, Lasioderma serricorne, and Lepidoptera adults, which collectively accounted for more than 85% of all captures. The total number of insects exhibited marked seasonal fluctuations, with the highest captures during late summer and early autumn and minimal activity during winter. Positive and significant correlations were detected among several dominant species, notably between Lepidoptera and T. castaneum, suggesting overlapping environmental preferences within the facility. These findings provide a detailed overview of the insects associated with feed industries in Greece and underscore the importance of continuous monitoring for effective pest management. The results highlight the need for seasonally adjusted control measures and contribute to a better understanding of the dynamics of stored-product pests under industrial conditions. Full article
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15 pages, 728 KB  
Article
Efficiency Enhancement Technology of Dastarcus helophoroides (Coleoptera: Bothrideridae) for Controlling Monochamus alternatus (Coleoptera: Cerambycidae): Drilling Optimization and Biological Collaboration
by Jiale Li, Min Zhang, Zhilan Li, Xiaohui Li, Yong Peng, Wenxiu Zhou, Zhengping Zhao and Xuewu Yan
Insects 2025, 16(11), 1138; https://doi.org/10.3390/insects16111138 - 7 Nov 2025
Viewed by 788
Abstract
Dastarcus helophoroides Fairmaire, a parasitic natural enemy widely used in the biological control of Monochamus alternatus Hope, possesses strong abilities to search for hosts and prey. To enhance the biological control efficacy of D. helophoroides against M. alternatus, this study systematically evaluated [...] Read more.
Dastarcus helophoroides Fairmaire, a parasitic natural enemy widely used in the biological control of Monochamus alternatus Hope, possesses strong abilities to search for hosts and prey. To enhance the biological control efficacy of D. helophoroides against M. alternatus, this study systematically evaluated the effectiveness of enhancing control through methods such as drilling holes in lure logs and introducing D. helophoroides carrying Pyemotes zhonghuajia or Beauveria bassiana under controlled indoor conditions. The results showed that: (1) Releasing D. helophoroides eggs (after 30 days) and releasing adults (after 120 days) were both effective in controlling M. alternatus, with the best control effects achieved when 50 eggs/m and 3 adults/m were released. The release of adults took longer to show effects but had better results than the release of eggs in the later stages. (2) The location and number of holes drilled in lure logs significantly influenced the efficiency of D. helophoroides in searching for and parasitizing M. alternatus, while the diameter of the holes was not significant. Considering the highest control efficacy and minimizing damage to the tree, the optimal conditions were releasing D. helophoroides adults 2 cm above M. alternatus fecal holes, with 0.4 cm in diameter and 2 holes/m release density, which significantly promoted the invasion of D. helophoroides adults into the borer tunnels and increased the M. alternatus mortality rate. (3) Releasing D. helophoroides adults carrying P. zhonghuajia or B. bassiana significantly improves the control efficacy against M. alternatus. The higher the number of D. helophoroides adults released per log segment and the greater the quantity of P. zhonghuajia or B. bassiana that they carry, the higher the mortality rate of M. alternatus. After 60 days of release, the highest mortality rate of M. alternatus was observed in treatments where D. helophoroides (released at densities of 3 adults per meter of log segment) carried P. zhonghuajia (0.6 million/m) or were sprayed with B. bassiana (3 g/m). The synergistic effect of carrying P. zhonghuajia was evident, but the overall control efficacy of spraying B. bassiana was limited. In summary, optimizing drilling techniques and combining biological release strategies under laboratory conditions can significantly enhance the control efficacy against M. alternatus, providing data support for D. helophoroides future application in forest pest control. Full article
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17 pages, 6569 KB  
Article
Attraction-Mediated Synergy: Insecticide Toxicity Against Coptotermes formosanus Enhanced by Trichoderma Metabolites
by Aysha Siddika, Siqi Chen, Keer Zhu, Xiangfei Wang, Xinquan Du, Linjuan Wan, Min Liu and Lang Zhang
Insects 2025, 16(11), 1116; https://doi.org/10.3390/insects16111116 - 31 Oct 2025
Viewed by 818
Abstract
Previous studies have demonstrated that Trichoderma metabolites triggered aggregation behavior in Coptotermes formosanus (Blattodea: Rhinotermitidae). Building on this, the present work systematically evaluated the behavioral effects of three specific Trichoderma metabolites—phenol, ethyl 2,4-dioxovalerate, and diglycolic acid—and their synergistic interactions with insecticides. We hypothesized [...] Read more.
Previous studies have demonstrated that Trichoderma metabolites triggered aggregation behavior in Coptotermes formosanus (Blattodea: Rhinotermitidae). Building on this, the present work systematically evaluated the behavioral effects of three specific Trichoderma metabolites—phenol, ethyl 2,4-dioxovalerate, and diglycolic acid—and their synergistic interactions with insecticides. We hypothesized that these metabolites attract C. formosanus through multiple behavioral mechanisms and enhance the toxicity of insecticides. Bioactivity showed that ethyl 2,4-dioxovalerate and diglycolic acid exhibited no significant toxicity. Phenol (5 × 10−2 to 5 µg/cm) and ethyl 2,4-dioxovalerate (5 × 10−1 µg/cm) elicited trail-following behavior. In the no-choice insecticide synergy test, phenol or diglycolic acid combined with imidacloprid (50 µg/g) resulted in substantially higher mortality compared to insecticides alone. The combination of metabolites with fipronil resulted in 100% mortality in termites. In two-choice aggregation tests, termite presence on metabolite-treated filter papers was significantly elevated compared to the controls. Fipronil (10 μg/g) alone significantly reduced termite aggregation. But when fipronil was combined with the metabolites, termite presence on the treated papers increased significantly, resulting in a substantial rise in mortality and demonstrating a clear attract–kill synergy. These findings identify Trichoderma metabolites as safe and effective behavioral regulators for C. formosanus. By enhancing insecticidal efficacy through attractant–toxicity synergy, they represent promising candidates for developing novel termite control strategies. Full article
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14 pages, 1451 KB  
Article
CHS-2 Is Involved in the Response of Aedes albopictus (Diptera: Culicidae) Larvae to Cadmium Stress by Mediating the Formation of the Peritrophic Membrane
by Chen Zhang, Yanjuan Ding, Ruoyun Lan, Min Zhou, Yanrong Chen, Bin Tang, Gexia Qiao and Shigui Wang
Insects 2025, 16(11), 1102; https://doi.org/10.3390/insects16111102 - 29 Oct 2025
Cited by 1 | Viewed by 756
Abstract
Pollution with heavy metals, such as cadmium (Cd), can significantly affect insect growth, development, and behavior. The midgut is an essential organ for stress response. Chitin synthase-2 (CHS-2) is closely associated with forming the peritrophic membrane (PM). The fourth-instar larvae of [...] Read more.
Pollution with heavy metals, such as cadmium (Cd), can significantly affect insect growth, development, and behavior. The midgut is an essential organ for stress response. Chitin synthase-2 (CHS-2) is closely associated with forming the peritrophic membrane (PM). The fourth-instar larvae of Aedes albopictus were exposed to varying concentrations of Cd. The results showed that Cd inhibited chitin synthesis and metabolism-related genes, but thickened the midgut PM, indicating that the larvae could respond to Cd stress through the midgut PM. Silencing CHS-2 by RNA interference resulted more severe vacuolization and malformation of midgut epithelial cells without midgut PM protection. Additionally, there was an intensified redox reaction, upregulated expression of metallothionein (MT) and heat shock proteins 70 (HSP70), and increased activity of antioxidant enzymes at some scattered time points. This study confirms that CHS-2 is involved in oxidative stress induced by Cd exposure by regulating PM formation. This study also contributes to further understanding the resistance mechanism of Ae. albopictus under Cd stress, thereby establishing a theoretical foundation for the future studies of them, which is concerned with the possibility of Ae. albopictus as a water environment detection and the control of Ae. albopictus based on resistance mechanism. Full article
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