Controle biológico de Dalbulus maidis (Delong & Wolcott, 1923) (Hemiptera: Cicadellidae) com Beauveria bassiana (Balsamo) Vuillemin E Metarhizium anisopliae (Metschn) Sorokin

Abstract

Corn occupies the second position among the main Brazilian agricultural commodities. However, the productivity of this crop can be affected by insect-pests, which, if not handled properly, can cause losses. Because of this, the control must be done effectively. Biological control has been gaining prominence as a practice with low impact on the environment. The objective of this work was to evaluate the efficiency of the entomopathogenic fungus Beauveria bassiana (Bovemip) isolated IBCB 66 (88.0 x 109 UFC/g) at a dose of 1 kg/ha, and Metarhizium anisopliae (Metamip) isolated IBCB 425 (4.5 x 1010 conidia/g of product), at a dose of 22.2 g/ha, both from the Promip company, on individuals of D. maidis. The negative control was distilled water and the positive control was the chemical insecticide Connect® (imidacloprid + beta-cyfluthrin) at a dose of 750 mL/ha. The experimental design used was entirely randomized blocks, using five replicates for each treatment, with each replicate consisting of five individuals, totaling 25 individuals per treatment. The data were submitted to variance analysis and the means were compared to each other using Tukey's test at 5% probability. According to the evaluations at 7 and 14 days after application, it was observed that the biological products did not differ statistically from the negative control, but indicated another form of control for D. maidis. [resumo fornecido pelo autor]