Dose Effects of Flubendiamide and Thiodicarb Against Spodoptera Species Developing on Bt and Non-Bt Soybean

Published: Aug. 15, 2023

An increase in Spodoptera species was reported Bt soybean fields expressing Cry1Ac insecticidal proteins Brazil, requiring additional management with chemical insecticides. Here, we evaluated the dose effects of flubendiamide and thiodicarb on cosmioides (Walker, 1858), eridania (Stoll, 1782), albula 1857) frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) that survived MON 87751 × 87708 87701 89788, Cry1A.105, Cry2Ab2 Cry1Ac; 89788 soybean, non-Bt soybean. On unsprayed Cry1A.105/Cry2Ab2/Cry1Ac only S. showed ~60% mortality after 10 d, whereas cosmioides, >81% mortality. Surviving larvae all this >80% when exposed to field label (70 mL/ha) or (400 g/ha) at 50% these doses. In contrast, four had <25% <19% respectively. types presented >83% post-exposure both levels thiodicarb. Some surviving sprayed a either insecticide developed into adults. However, L1 developing leaves L2 prolonged immature stage, females lower fecundity, which are likely impact its population growth

Language: Английский

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Dose Effects of Flubendiamide and Thiodicarb against Spodoptera Species Developing on Bt and Non-Bt Soybean

Insects, Journal Year: 2023, Volume and Issue: 14(9), P. 766 - 766

Published: Sept. 14, 2023

An increase in Spodoptera species was reported Bt soybean fields expressing Cry1Ac insecticidal proteins Brazil, requiring additional management with chemical insecticides. Here, we evaluated the dose effects of flubendiamide and thiodicarb on cosmioides (Walker, 1858), eridania (Stoll, 1782), albula 1857) frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) that survived MON 87751 × 87708 87701 89788, Cry1A.105, Cry2Ab2 Cry1Ac; 89788 soybean, non-Bt soybean. On unsprayed Cry1A.105/Cry2Ab2/Cry1Ac only S. showed ~60% mortality after 10 d, whereas cosmioides, >81% mortality. The surviving larvae all this >80% when exposed to field label (70 mL/ha) or (400 g/ha) at 50% these doses. In contrast, four had <25% <19% respectively. types presented >83% exposure both levels thiodicarb. Some sprayed a either insecticide developed into adults. However, L1 developing leaves L2 prolonged immature stage, females displayed lower fecundity, which are likely impact population growth

Language: Английский

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Lethal and sublethal effects of insecticides on Bathycoelia distincta (Heteroptera: Pentatomidae)

African Entomology, Journal Year: 2024, Volume and Issue: 32

Published: April 5, 2024

Bathycoelia distincta is one of the most dominant stink bug pests associated with macadamia orchards in South Africa. Understanding toxicity and sublethal effects insecticides on this pest essential for its effective management. This study tested four commercial insecticide formulations, consisting organophosphate (acephate) three pyrethroids (lambda-cyhalothrin, beta-cyfluthrin tau-fluvalinate). The these their behavioural mobility were assessed. lambda-cyhalothrin biological parameters parent B. (F0) offspring generations (F1) also determined by treating adults concentrations (LC10 LC30). In bioassays, acephate was more toxic to than lambda-cyhalothrin, tau-fluvalinate. Behavioural changes only observed bugs exposed pyrethroids, resulting an increase distance walked decrease angular velocity. F0 generation, LC30 reduced fecundity whereas LC10 accelerated development F1 generation. These results suggest that may enhance dispersal stimulate growth populations. Further experiments should be conducted confirm understand mechanism action distincta.

Language: Английский

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Fitness costs associated with laboratory induced resistance to chlorpyrifos in Spodoptera litura

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Dec. 28, 2024

Spodoptera litura (Fabricius) is a major polyphagous pest of global relevance due to the damage it causes various crops. Chlorpyrifos (CPF) generally used by farmers manage S. litura, however, its widespread use has resulted in development insecticide resistance. Therefore, present study, population was exposed CPF for eight generations under laboratory conditions, resulting 2.81-fold resistance ratio compared with that unselected (Unsel-Lab). The exposure Unsel-Lab and CPF-Sel populations their respective lethal sublethal concentrations reduced larval survival, adult emergence, prolonged period, induced morphological deformities adults. reproductive demographic parameters were also significantly lowered treated larvae both at higher concentrations. Moreover, hormetic effects on fecundity, next-generation larvae, net rate (R

Language: Английский

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Sublethal effect and detoxifying metabolism of metaflumizone and indoxacarb on the fall armyworm, Spodoptera frugiperda

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Sept. 6, 2023

Abstract The fall armyworm (FAW), Spodoptera frugiperda , is a highly polyphagous invasive pest that damages on various crops. Pesticide control the most common and effective strategy to of FAW. In this study, we evaluated toxicity metaflumizone indoxacarb against third-instar FAW larvae using insecticide-incorporated artificial diet method under laboratory conditions. Both exhibited substantial FAW, with LC 50 values 2.43 14.66 mg/kg at 72 h, respectively. sublethal effects were investigated by exposing 10 30 concentrations these insecticides. Sublethal exposure two insecticides significantly shortened larval adult developmental times, extended pupal led reduced weight, pupation rates, fecundity in treated parental generation or concentrations, comparison group. We also assessed he transgenerational effects, findings indicated had comparable F0 generation, except for an observed significant increase time F1 generation. Furthermore, Larvae exposed elevated activity levels Multifunctional oxidase (MFO) glutathione S-transferase (GST), which coincides synergistic effect PBO DEM. conclusion, high negative impact provided implications rational utilization pest.

Language: Английский

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