Banca de QUALIFICAÇÃO: KAROLAYNE LOPES CAMPOS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : KAROLAYNE LOPES CAMPOS
DATE: 24/02/2025
TIME: 14:00
LOCAL: Virtual
TITLE:

PHENOLOGY AND REPRODUCTIVE STATUS OF COTTON BOLL WEEVIL IN THE CERRADO PRODUCTION SYSTEM

KEY WORDS:

Anthonomus grandis grandis, population dynamics, reproductive dynamics, cotton fallow period

PAGES: 28
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

The management of the cotton boll weevil, Anthonomus grandis grandis Boh., has become increasingly challenging in the Cerrado. One hypothesis claims the maintenance of populations in reproductive activity throughout the off-season. This study assessed the presence and reproductive status of the cotton boll weevil collected during both the growth and off-seasons in the Cerrado, monitoring adult populations and the reproductive condition of females. The monitoring occurred over two agricultural years (2022/2023 and 2023/2024) utilizing traps baited with sexual and aggregation pheromones in commercial fields. Each week, the adults caught in traps were recorded, sexed, and assessed for reproductive conditions: mating, sperm viability, and egg development. A total of 94,180 adult weevils were collected, with the average boll weevil caught per trap per week (BAS) comparable to or greater than that of the off-season. The proportion of females collected during the growing season was roughly 20% greater than in the off-season; nevertheless, there were 50.9% and 35.9% more copulated females in the off-season compared to the growing season in both years. The spermatozoa in these females exhibited comparable vitality over both periods, ranging from 72.6% to 95.9% in each year. Females possessing eggs capable of oviposition, evidenced by eggs in the reproductive tract, were caught throughout both the growth and off-seasons. The findings demonstrate that a significant proportion of female boll weevils remain reproductively active during the off-season in the Cerrado. The findings indicate that female boll weevils are locating cotton plants for oviposition during the off-season. This indicates that the fallow period is not significantly impacting the suppression of the boll weevil population as anticipated.

COMMITTEE MEMBERS:
Presidente - JORGE BRAZ TORRES
Externa à Instituição - CRISTINA SCHETINO BASTOS - UnB
Externo à Instituição - GUILHERME GOMES ROLIM