ABSTRACT

The combination of chemical and biological methods to control pests is essential to ensure the sustainability of agricultural system, to reduce using of chemicals products. The objective this work was to evaluate the effects of insecticides on the coccinellid predatory Hyppodamia convergens, the cotton plant, in conditions laboratory and field. Were the following treatments established, expressed in g or mL of active ingredient of insecticide per hectare: flonicamid to 50, 80 and 150 g, thiamethoxam at 200 g to 150 g acetamiprid, imidacloprid to 250 mL and control without application. The evaluation effect of insecticides applied directly and indirectly (residual effects on leaves) on H. convergens, was performed by quantification of insects survived to 7 days after application. Based on the results of experiments, we can conclude that among the insecticides evaluated, flonicamid caused the lower mortality of H. convergens. The insecticides thiamethoxam, acetamiprid and imidacloprid showed similar behavior, causing high mortality of H. convergens.

KEY WORDS
Selectivity; Gossypium hirsutum ; biological control; natural enemy