Preferência para oviposição, nível de dano econômico e controle químico da Bemisia tabaci biótipo B (Gennadius 1889) (Hemiptera: Aleyrodidae) em soja (Glycine max L.)

Abstract

The soybean crop is of fundamental importance for the Brazilian economy. With large cultivated area, it has among the main pests the whitefly Bemisia tabaci B biotype (Gennadius 1889) (Hemiptera: Aleyrodidae). It is a cosmopolitan plague and of agricultural importance throughout the world. Besides sucking sap, injection of toxins and transmission viruses, its sugary tailings favor the appearance of sooty, damaging the photosynthesis of the plants. Knowledge about the pest is of fundamental importance so that damages are reduced and control costs are minimized. The objectives of this work were to evaluate the preference for oviposition of whitefly biotype B to eight soybean cultivars (68i70 RSF IPRO®, BMX Potência RR®, M6210 IPRO®, 6968 RSF®, M5947 IPRO®, BRS 1003 IPRO®, 63i64 RSF® e M6410 IPRO®), to verify the efficiency of control of the insecticides Chlorantraniliprole, Cyantraniliprole and Fipronil) applied through seed treatment and to identify the level of economic damage of this pest in soybean. The experiments were conducted in the Laboratory of Applied Entomology of the Federal University of Grande Dourados, under greenhouse conditions. The infestations carried out in the experiments were carried out by adults from breeding previously kept in cabbage plants. The experimental design was a randomized complete block design. Among the tested cultivars, the BRS 1003 IPRO® and 68i70 RSF IPRO® cultivars showed the lowest average egg / cm2, not significantly different from the cultivars 6968 RSF®, M6410 IPRO® and 63i64 RSF IPRO®. Regarding the treatment of seeds, the plants treated with Ciantraniliprole were those that presented greater efficiency of control and greater production of grains. With the infestations reached, it was not possible to detect significantly whitefly damage in soybean yield.