Management of target pests of Bt soybean in refuge areas, assessment of ecological risk to ground-dwelling predators and their implications for insect resistance the management

• Ano de defesa: 2021
• Autor(a) principal: Barros, Lucas Silva
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Bt soybean; Campos de refúgio; Capacidade de voo; Controle de pragas; Diamidas; Diamide insecticide; Dinâmica populacional; Flight performance; Life history; Pest control; Population dynamics; Refuge fields; Soja Bt; Tabela de vida
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/11/11146/tde-17062021-150705/

The high-dose/refuge strategy is the most Insect Resistance Management (IRM) plan to delay evolution of resistance in target pest to transgenic insecticidal crop. Also, the Environmental Risk Assessments (ERA) represent the important step to monitoring the ecological impact of Bt plants to Non-Target Organism (NTO\'s). Thus, to support IRM programs to transgenic soybean MON87701 × MON89788 expressing high concentration of Cry1Ac protein from Bacillus thuringiensis (Bt), was carried out a studies to understand the best Integrated Pest Management (IPM) strategies to apply on refuge areas of Bt soybean aiming for the maximum generation of a susceptible individual in parallel with economically viability, as well as the sublethal effects of insecticides on development and flight performance of target-pest of Bt soybean and their implications for Bt soybean refuge area management, as well as the ecological risk of Bt soybean on Ground-Dwelling Predatory (GDP\'s) arthropods, and the potential impact on resistance evolution. According with larvae abundance as source of generation susceptible moth, our results showed that only the management of pest stink bugs in refuge areas of Bt soybean (control treatment) provided satisfactorily the potential susceptible individuals, as well as the best indicators of economic- financial viability and productivity. The sublethal effects of flubendiamide and chlorantraniliprole insecticides on Chloridea virescens\' population dynamics could lead to generation asynchrony and provide insufficient susceptible moths when sprayed on refuge crops. However, the distance and duration of flight may still be enough to ensure mixing of potentially resistant and susceptible populations from refuge plots. In relation to ERA, we did not find ecological impact of Bt soybean on the ground-dwelling predatory arthropod community, or significant differences in their diversity. The most species in Bt and non-Bt soybean areas consisting of members of the families Carabidae, Formicidae, Anisolabididae and the Araneidae group. The potential of dominant GDP\'s to delay or accelerate the evolution of resistance could be not concluded and must be investigate more.