Avaliação da seletividade e persistência de inseticidas a Orius insidiosus SAY, 1832 (Hemiptera: anthocoriade)

Abstract

Integrated Pest Management is a method that seeks to control insect pests through various approaches. Among these methods is biological control, which uses living organisms known as natural enemies, such as predatory insects and parasitoids. However, the use of non-selective chemical products poses a risk to the efficiency of these biological control agents. Therefore, this study aimed to evaluate the toxicity to eggs and adults, as well as the persistence of different insecticides used in soybean crops on the predatory bug Orius insidiosus. A completely randomized design was employed with nine treatments: TR1 – distilled water; TR2 – Chlorfluazuron; TR3 – Triflumuron; TR4 – Thiamethoxam + Lambda-Cyhalothrin; TR5 – Cypermethrin; TR6 – Bifenthrin + Carbosulfan; TR7 – Lambda-Cyhalothrin + Chlorantraniliprole; TR8 – Acetamiprid + Bifenthrin; and TR9 – Fipronil, all at the maximum doses recommended on the label for lepidopterans or sucking pests. All tested insecticides were non-selective after 96 hours of evaluation, showing mortality rates above 95%. In the persistence test, after 96 hours of exposure, all insecticides resulted in mortality rates above 50%, indicating persistence. Regarding the eggs of O. insidiosus, the insecticides TR2 – Chlorfluazuron; TR3 – Triflumuron; TR5 – Cypermethrin; and TR8 – Acetamiprid + Bifenthrin were selective. The insecticide TR7 – Lambda-Cyhalothrin + Chlorantraniliprole was moderately selective, while TR4 – Thiamethoxam + Lambda-Cyhalothrin; TR6 – Bifenthrin + Carbosulfan; and TR9 – Fipronil were non-selective.