EFFICIENCY OF INSECTICIDES IN LARVAE AND ADULTS CONTROL OF CITRUS ROOT WEEVILS EFICIÊNCIA DE INSETICIDAS NO CONTROLE DE LARVAS E ADULTOS DE CURCULIONÍDEOS-DAS-RAÍZES EM CITROS

Abstract

The control of larvae and adults of citrus root weevils (Naupactus spp.) was evaluated in four experiments, in field and laboratory conditions, at Itapetininga, Sao Paulo State, Brazil. For larvae control of Naupactus spp. the insecticides tested were: aldicarb, bifenthrin, carbofuran, carbosulfan, chlorpyrifos (GR), chlorpyrifos (EW), fipronil, imidacloprid, and thiamethoxam (GR). For adults control of Naupactus cervinus and N. versatilis the following products were tested: abamectin, carbosulfan. lufenuron, lufenuron + abamectin, and thiamethoxam (WG). The efficiency control of Naupactus spp. larvae was below 80%, for all treatments tested (insecticides, dosages, and application methods). On larvae, the best results were obtained with thiamethoxam (GR) 2.40 g, fipronil 0.19 g, and thiamethoxam (WG) 1.00 g of a.i.plant-1, with 71.43%, 74.12% and 77.87% larvae population reduction, respectively. For N. cervinus and N. versatilis adults control, thiamethoxam (WG) with 0.75 g and 1.00 g, and carbosulfan with 0.64 g of a.i. planta-1 showed efficiency above 80% in the field tests. While in the laboratory test, besides these treatments, also tiamethoxam (WG) with 0.5 g of a.i. plant-1 presented such efficiency. The adult mortality was similar between the studied species. Thiamethoxam (WG) and carbosulfan may be reccommended for adults of this insect. KEY-WORDS: Insect pest; Naupactini; chemical control.