IMPACT OF RESIDUAL INSECTICIDES USED IN SUGAR CANE ON ADULTS OFCotesia flavipes (HYMENOPTERA: BRACONIDAE)

• DOI: 10.22533/at.ed.9732112216094

• Palavras-chave: Saccharum officinarum,MIP, Residual,Parasitoid,Cane Borer.

• Keywords: Saccharum officinarum,MIP, Residual,Parasitoid,Cane Borer.

• Abstract:

  The present study aimed to evaluate the selectivity of adults of the parasitoid Cotesia flavipes on insecticides used in sugarcane. The experiment was carried out in a greenhouse and in the Entomology laboratory of ILES/ULBRA in the municipality of Itumbiara-GO. The experiment was carried out in a completely randomized design with 7 treatments and 10 replications.The insecticides used were: Chlorantraniliprole, Chlorantraniliprole + lambda-cyhalothrin, Triflumuron, Bacillus thuringiensis, Lambda-cyhalothrin + thiamethoxam and Fipronil. For each insecticide, the commercial doses recommended for the control of Sugarcane Borer (Diatraea saccharalis) were used.. For installation of the experiment, pre-sprouted seedlings of sugarcane variety RB85 5156 were planted in 10 L polyethylene pots. After the application of insecticides, the sugarcane leaves were cut into pieces of 5 cm in length in order to occupy the internal area of ​​the plate. In eachIn a petri dish, ten adults of C. flavipes were released, constituting an experimental plot. Petri dishes were kept at room temperature in the shade until the insect mortality was evaluated, which was carried out at 6, 12, 18 and 24 hours after exposure of natural enemies to insecticides.The insecticides tested significantly affected the mortality of C. flavipes on the day of spraying and at 5 and 10 days after spraying. The biological insecticide B. thuringiensis, when compared to the other insecticides evaluated, showed greater selectivity to the natural enemy C. flavipes (10 days) after spraying the products. However, the insecticides Chlorantraniliprole, Chlorantraniliprole + lambda-cyhalothrin, Triflumurom, Lambda-cyhalothrin + thiamethoxam and Fipronil caused 100% mortality on C. flavipes adults, being considered non-selective to the natural enemy. Thus, the data obtained emphasize the importance of determining the appropriate moment for the release of C. flavipes after the use of insecticides in the field.