Banca de DEFESA: KAROLAYNE LOPES CAMPOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : KAROLAYNE LOPES CAMPOS
DATE: 16/02/2022
TIME: 14:00
LOCAL: Programa de Pós-Graduação em Entomologia - UFRPE
TITLE:

COTTON SEED TREATMENT: PROTECTION AGAINST EARLY-SEASON SUCKING INSECTS AND CONSERVATION OF PREDATORY INSECTS

KEY WORDS:

Systemic insecticides, neonicotinoids, diamides, ecological selectivity, zoophytophagy.

PAGES: 74
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

The seed treatment with insecticides is usually made with non-selective materials as a recommended tactic to protect and∕or to reduce early-season insect infestation in the crop. In theory, this insecticide deployment is considered selective by making insecticide available in plant tissues, which is acquired by insect pests and not by natural enemies. However, non-target insects such as zoophytophagous natural enemies and pollinators can become contaminated when using plant products such as pollen, nectar and sap highlighting the importance of using selective insecticides. We assess the cotton early-season sucking insect control and selectivity of cyantraniliprole (a selective diamide) and thiamethoxam (a non-selective neonicotinoids) through seed treatment (ST) and foliage application (FA). The insecticide residues on the plants were quantified at 12, 22, and 32 days after emergence (DAE) to assess the survival of the predators Orius insidiosus (Say) (zoophytophagous) and Eriopis connexa (Germar) (chewing) when confined on fresh plant materials treated with either insecticides and FA or ST. Both insecticides had residues detected on plants but significantly reduced between 12 DAE and 22 DAE and, they were not detected at 32 DAE. Both insecticides offered aphid suppression but with a more prolonged effect of thiamethoxam, and both were not effective against high thrips infestation. Whitefly densities were variable between experiments, with economic threshold observed in all treatments after the expected plant protection with TS. The abundance of predators was higher in the control treatment, while treatments with thiamethoxam either ST or PV trended to have lower predator abundance. Cyantraniliprole TS and FA were compatible with both predators (>92% survival). Thiamethoxam was not toxic to E. connexa but highly toxic to O. insidiosus through dried residues from FA to TS (1.2% vs. 27.6% survival). At 22 DAE, O. insidiosus still showed lower survival with thiamethoxam FA than TS (51.4% vs. 89.3%). Regardless of the insecticides used and mode of use, there was no statistical difference in raw cotton yield across treatments.

BANKING MEMBERS:
Presidente - 1542788 - HERBERT ALVARO ABREU DE SIQUEIRA
Interno - 1225573 - JORGE BRAZ TORRES
Externo à Instituição - GUILHERME GOMES ROLIM