Seletividade de Inseticidas ao complexo de inimigos 1

Pesquisa Agropecuária Tropical, 35 (2): 123-127, 2005 – 123

SELETIVIDADE DE INSETICIDAS AO COMPLEXO DE INIMIGOS
NATURAIS NA CULTURA DO ALGODÃO (Gossypium hirsutum L.)1
Cecilia Czepak2, Paulo Marçal Fernandes2, Karina Cordeiro Albernaz2, Ohana Daroszewski Rodrigues3,
Lucimar Martins Silva2, Edgar Alves da Silva2, Fábio Shigeo Takatsuka4 e Jácomo Divino Borges2

ABSTRACT
SELECTIVITY OF INSECTICIDES ON THE COMPLEX
OF NATURAL ENEMIES IN COTTON CROP
(Gossypium hirsutum L.)

RESUMO

The selectivity of insecticides was evaluated in the complex of natural enemies of the cotton (Gossypium hirsutum
L.) crop. The cultivar Deltapine was used in a randomized block experimental design, with seven treatments and four replications.
The treatments, all in their commercial formulation, were: control; thiamethoxam (300 g.ha-1); lufenuron (300 mL.ha-1); betacyflutrin
(800 mL.ha-1); imidacloprid (70g.ha-1); diflubenzuron (6,0 g.ha-1); and endosulfan (1500 mL.ha-1). The insecticides were sprayed at
45 days after germination. Besides the initial evaluation, other evaluations were performed three and seven days after insecticide application. Each plot was sampled by the fabric beating method, with two random beatings per plot. Natural enemies were identified and counted. Three days after application, the insecticides thiamethoxam (300 g.ha -1), lufenuron (300 mL.ha -1), and diflubenzuron (60 g.ha-1) did not showed negative effect on the complex of predators present in the cotton. However, seven days after application, only the lufenuron treatment maintained the selective effect over predator complex.

Avaliou-se a seletividade de inseticidas sobre o complexo de inimigos naturais na cultura do algodão (Gossypium hirsutum
L.), no município de Goiânia, GO. Utilizou-se a cultivar Deltapine e o delineamento experimental em blocos ao acaso, com sete tratamentos e quatro repetições. Os tratamentos foram: testemunha, thiamethoxam (300 g.ha-1), lufenuron (300 mL.ha-1), betacyflutrin (800 mL.ha -1