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Article

Deltamethrin-Mediated Effects on Locomotion, Respiration, Feeding, and Histological Changes in the Midgut of Spodoptera frugiperda Caterpillars

1
Department of Crop Science, Federal University of Viçosa, Viçosa 36570000, Brazil
2
Department of Entomology, Federal University of Viçosa, Viçosa 36570000, Brazil
3
Department of Crop Production, Federal University of Vales Jequitinhonha and Mucuri, Diamantina 39100000, Brazil
4
Department of General Biology, Federal University of Viçosa, Viçosa 36570000, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Hanafy Ismail
Insects 2021, 12(6), 483; https://doi.org/10.3390/insects12060483
Received: 23 April 2021 / Revised: 13 May 2021 / Accepted: 21 May 2021 / Published: 22 May 2021
(This article belongs to the Special Issue Pesticide Chemistry and Toxicology)
Spodoptera frugiperda is controlled mainly with chemical insecticides. Toxicity, survival, respiration, mobility, anti-feeding effect, and histology of the midgut of S. frugiperda caterpillars exposed to deltamethrin were evaluated. Deltamethrin was toxic to third-instar caterpillars, decreasing survival. The insecticide reduces the respiratory rate and food consumption, and causes repellency. Exposure to deltamethrin causes histological alterations in the midgut, damaging the digestive cells and peritrophic matrix. Deltamethrin is toxic to S. frugiperda caterpillars, causing mortality, alteration of locomotor behavior, reduced respiration and feeding, and irreversible damage to the midgut epithelium.
Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is the main pest of maize crops, and effective methods for pest management are needed. The insecticidal efficacy of deltamethrin was evaluated against S. frugiperda for toxicity, survival, locomotion, anti-feeding, and histological changes in the midgut. Concentration–mortality bioassays confirmed that deltamethrin (LC50 = 3.58 mg mL−1) is toxic to S. frugiperda caterpillars. The survival rate was 99.7% in caterpillars not exposed to deltamethrin, decreasing to 50.3% in caterpillars exposed to LC50, and 0.1% in caterpillars treated with LC90. Spodoptera frugiperda demonstrated reduced mobility on deltamethrin-treated surfaces. Deltamethrin promoted a low respiration rate of S. frugiperda for up to 3 h after insecticide exposure, displaying immobilization and inhibiting food consumption. Deltamethrin induces histological alterations (e.g., disorganization of the striated border, cytoplasm vacuolization, and cell fragmentation) in the midgut, damaging the digestive cells and peritrophic matrix, affecting digestion and nutrient absorption. View Full-Text
Keywords: anti-feeding effect; histopathology; repellency; respiration rate; survival; toxicity anti-feeding effect; histopathology; repellency; respiration rate; survival; toxicity
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MDPI and ACS Style

Vinha, G.L.; Plata-Rueda, A.; Soares, M.A.; Zanuncio, J.C.; Serrão, J.E.; Martínez, L.C. Deltamethrin-Mediated Effects on Locomotion, Respiration, Feeding, and Histological Changes in the Midgut of Spodoptera frugiperda Caterpillars. Insects 2021, 12, 483. https://doi.org/10.3390/insects12060483

AMA Style

Vinha GL, Plata-Rueda A, Soares MA, Zanuncio JC, Serrão JE, Martínez LC. Deltamethrin-Mediated Effects on Locomotion, Respiration, Feeding, and Histological Changes in the Midgut of Spodoptera frugiperda Caterpillars. Insects. 2021; 12(6):483. https://doi.org/10.3390/insects12060483

Chicago/Turabian Style

Vinha, Germano L., Angelica Plata-Rueda, Marcus A. Soares, José C. Zanuncio, José E. Serrão, and Luis C. Martínez 2021. "Deltamethrin-Mediated Effects on Locomotion, Respiration, Feeding, and Histological Changes in the Midgut of Spodoptera frugiperda Caterpillars" Insects 12, no. 6: 483. https://doi.org/10.3390/insects12060483

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