Banca de QUALIFICAÇÃO: Larah Martins Freitas

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE: Larah Martins Freitas
DATA: 05/02/2024
HORA: 14:00
LOCAL: Anfiteatro do Departamento de Entomologia (DEN)
TÍTULO:

Resistance of Bt and non-Bt soybean cultivars to Chrysodeixis includens and Spodoptera frugiperda (Lepidoptera: Noctuidae)

PALAVRAS-CHAVES:

host plant resistance, transgenic, soybean looper, fall armyworm, Cry1Ac

PÁGINAS: 27
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitossanidade
ESPECIALIDADE: Entomologia Agrícola
RESUMO:

Soybean is a commodity crop of great economic importance for Brazil and other countries. A complex of lepidopteran caterpillars, highlighting Chrysodeixis includens and Spodoptera frugiperda, causes defoliation to soybeans that often results in economic damage to grain production. The control of these pests has been done primarily with transgenic Bt cultivars, but little is known about the resistance of Bt and non-Bt cultivars adapted to novel soybean growing regions in Brazil, such as Minas Gerais state. This study evaluated the effects of Bt and non-Bt soybean cultivars on larval performance of C. includens and S. frugiperda. Experiments were conducted with Bt (NS6010 IPRO and P97R50 IPRO) and non-Bt cultivars (UFLA 6301 RR, P96R90 RR, and ANsc 80111 RR) using V3-V4 stage soybeans in laboratory no-choice assays with neonate and third-instar larvae of both insect species. The larvae were fed soybean leaf discs in Petri dishes, recording the mortality, leaf consumption, and weight gain after 7 days. There was high mortality of C. includens neonates on the Bt cultivars, but this trend was not observed for older larvae, being similar to that on non-Bt soybeans. For S. frugiperda neonates, there was high mortality in the Bt cultivar NS 6010 IPRO and non-Bt cultivar UFLA 6301 RR, while for older larvae, only the former was effective. Although the Bt cultivars did not kill C. includens third-instars, antinutritional effects were found, such that leaf tissue consumed was not converted to weight gain; for S. frugiperda this effect was not evident. In conclusion, the results of this study are important for defining regional strategies of integrated and resistance management of C. includens and S. frugiperda in expanding regions of soybean cultivation.

MEMBROS DA BANCA:
Externo ao Programa - ADRIANO TEODORO BRUZI - DAG/ESAL (Membro)
Interno - BRIGIDA DE SOUZA (Suplente)
Presidente - BRUNO HENRIQUE SARDINHA DE SOUZA (Membro)
Interno - GERALDO ANDRADE DE CARVALHO (Membro)
Interno - LUIS CLAUDIO PATERNO SILVEIRA (Suplente)
Interno - MARIA FERNANDA GOMES VILLALBA PENAFLOR (Membro)