Chemical control of sharpshooter in citrus
Pedro Takao Yamamoto, Wolney Dalla Pria Júnior, Sérgio Ruffo Roberto, Marcos Rogério Felippe, Eduardo José De Almeida & Éder Paulo De Freitas
Abstract
This research was an attempt to evaluate insecticides, doses and application methods for the control of Oncometopia facialis sharpshooter, vector of the Xylella fastidiosa bacterium that causes Citrus Variegated Chlorosis. The trials were carried out in Araraquara city area, São Paulo State. The following systemic insecticides were studied: thiamethoxam 10 GR (0.25 and 0.13 g a.i. per plant), thiamethoxam 250 WG (0.5?); aldicarb (1.5?) (soil application); imidacloprid (0.5?); thiamethoxam 250 WG (0.5) (trunk application); deltamethrin (3.75 and 2.5 g a.i. per 100 L), triazophos + mineral oil (45.0 + 378?), acrinathrin (0.5?), triazophos + dimethoate + mineral oil (20.0 + 20.0 + 378?), acrinathrin + fenpyroximate (0.25 + 2.50?), lambda cyhalothrin (0.5, 1.0, 1.5, and 2.0?) and metidathion (40.0?) (canopy spray). A randomized design with four replications was used as statistical model. Groups of sharpshooters were caged in branches of treated plants for insecticides effectiveness measurement. All tested insecticides were efficient to control O. facialis and can be used for X. fastidiosa vectors management. The inseticides applied through canopy spray showed better initial effect than soil and trunk inseticide application; however, they showed higher residual period of control. The most effective inseticides applied through canopy spray were acrinathrin (0.5 g), which resulted in 95% of control 16 days after application (DAA) and lambda cyhalothrin (0.5 g) with 74% 14 DAA. The most efficient systemic insecticides applied on soil were aldicarb (1.5 g) with 84% of control 20 DAA and imidacloprid (0.5 g) with 82% 20 DAA.