Banca de DEFESA: LEANDRA DE OLIVEIRA COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LEANDRA DE OLIVEIRA COSTA
DATE: 23/02/2024
TIME: 08:30
LOCAL: Auditório Fitossanidade
TITLE:

QUALITY ASSESSMENT OF THE LADY BEETLE, Eriopis connexa (GERMAR) (COLEOPTERA: COCCINELLIDAE), RESISTANT TO PYRETHROIDS AFTER 130 GENERATIONS OF REARING IN THE LABORATORY

KEY WORDS:

Biological control, natural enemy quality control, insecticide resistance, mass rearing

PAGES: 55
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

Augmentative biological control requires the rearing of natural enemies for release. The quality of the natural enemy might deteriorate after many generations of laboratory rearing. In addition, insects that are resistant to insecticides may exhibit reduced performance as a result of the costs of insecticide resistance. The lady beetle, Eriopis connexa (Germar), exhibits metabolic resistance to the pyrethroid λ-cyhalothrin. The resistant population (EcViR) has been under laboratory rearing for more than 130 generations, and it is more than 260 times more resistant to λ-cyhalothrin. Thus, the biological and behavioral traits of the EcViR population were compared to those of a field-collected and λ-cyhalothrin-susceptible population (EcCV). Females from both populations showed similar survival during 35 days of observations when subjected or not to food shortages from 5o to 20o days of adulthood, with a higher fecundity obtained for EcViR females. Predation of the turnip aphid, Lipaphis pseudobrassicae Davis, in the presence or absence of λ-cyhalothrin resulted in a type II functional response, irrespective of the beetle population. However, EcViR individuals showed a higher rate of aphid consumption than EcCV, independent of the λ-cyhalothrin residue. The duration of larval development was similar between populations when reared at 18, 25, and 32 °C. On the other hand, larger EcCV females emerged from larvae reared at 18 and 25 °C than female EcViR, and EcCV females produced higher numbers of eggs at 25 and 32 °C. The results show that the EcViR individuals maintained their predation rate and reproductive performance when subjected to a food shortage after 100 generations of rearing in the laboratory. On the other hand, the fecundity of EcViR females was lower when fed ad libitum, reared since larvae, and maintained at 25 and 32 °C. Thus, the results corroborate the hypothesis that the predation rate is not affected in the resistant population after laboratory rearing. However, the fecundity is affected in the resistant population due to the adaptive cost of resistance, making it more evident at different temperatures.

COMMITTEE MEMBERS:
Presidente - JORGE BRAZ TORRES
Interno - ***.168.694-** - JOSE VARGAS DE OLIVEIRA - UFRPE
Interna - ***.393.814-** - ROBERTA RAMOS COELHO - UFRPE