Banca de DEFESA: ANA PAULA NASCIMENTO DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE: ANA PAULA NASCIMENTO DA SILVA
DATA: 28/10/2022
HORA: 08:30
LOCAL: Anfiteatro da Entomololgia
TÍTULO:

SUBLETHAL EFFECTS OF SYNTHETIC INSECTICIDES ON LIFE HISTORY OF MYZUS PERSICAE (SULZER) (HEMIPTERA, APHIDIDAE) UNDER VARYING TEMPERATURES

PALAVRAS-CHAVES:

agar, aphids, fecundity, hormesis, hydrogel, laboratory conditions, longevity

PÁGINAS: 294
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitossanidade
ESPECIALIDADE: Entomologia Agrícola
RESUMO:

Myzus persicae (Sulzer) (1776) (Hemiptera: Aphididae) has a wide geographic distribution and is considered a pest of economic importance in several agricultural crops. This work was carried out with the objectives of verifying how the combined effect of temperature and host plant in different breeding substrates affects the biological cycle of M. persicae; investigate how sublethal exposure of organophosphate and pyrethroid along with temperature variation affect its behavior; investigate how sublethal exposure of a mixture of thiamethoxam + lambda-cyhalothrin and their active ingredients alone, along with temperature variation, affect its behavior; and investigate how sublethal exposure of imidacloprid along with temperature variation affect its, and get a better understanding of oxidative stress under these stressors. To verify the effect of the rearing substrates, three concentrations of hydrogel (0.3g, 0.6g and 0.9g) and 10% agar were tested, and after that, an Age-stage, Two-sex life table of the aphid was prepared with eight distinct treatments, following the pre-established maintenance protocols in (M.E.E.T). For toxicity evaluation, the dose-response curve of insecticides was determined by the leaf dip method, and for the evaluation of sublethal effects, the concentrations Control, CL1, CL5, CL10, CL15, CL20 and CL30 were selected. The whole experiment was maintained in climatized chambers (BOD) with their respective temperatures (15, 20, 25 and 28°C). The results showed that colonies of M. persicae can be maintained over time producing enough offspring using hydrogel, and we also observed that the development period, reproductive and population parameters of M. persicae had more significant differences by host plants combined with temperatures, the influence of the rearing substrate did not show discrepant differences in the development of individuals. Furthermore, we highlight the fact that the increase/decrease of temperature can induce a higher/lower efficacy of chemicals under the individuals of this species, and we also show how the result of the correlation of temperature with chemical toxicity can induce a hormetic response in the biological characteristics of this species, contributing to a beneficial stimulatory effect on fecundity and longevity of individuals. By correctly using pest management strategies, it is possible to maintain the balance of the environment and preventing economic losses. The results obtained in this study provided important information about the adaptation mechanisms of these organisms in challenging environments, which will be of paramount importance for the design of management strategies for M.persicae in agroecosystems.

MEMBROS DA BANCA:
Externo à Instituição - ANTONIO BIONDI - UNICT (Membro)
Externo à Instituição - GRAZIELA DOMINGUES DE ALMEIDA LIMA - UFV (Suplente)
Externo à Instituição - OSCAR AMAYA SANTOS - UFLA (Membro)
Externo à Instituição - RICARDO SIQUEIRA DA SILVA - UFVJM (Membro)
Externo ao Programa - VITOR DE LAIA NASCIMENTO - DBI/ICN (Membro)
Interno - BRUNO HENRIQUE SARDINHA DE SOUZA (Suplente)
Presidente - KHALID HADDI (Membro)