Tank mixture of pesticides and foliar fertilizes for Triozoida limbata control in guava trees (Psidium guajava L.)

Resumo

Although the tank mixture of pesticides and foliar fertilizers is common practice in agriculture, further clarification and scientific support is needed to be regulated. Thus, the objective of this work was to evaluate the effect of tank mixture of an organosilicon adjuvant and manganese foliar fertilizer throw the insecticide imidacloprid effectiveness over Triozoida limbata control in guava trees. The experimental plot was considered with four trees followed in the same cultivation line subdivided into 4 quadrants. The experiment followed a randomized block design with split plots, with four replications. Treatments were T1 – Imidacloprid (Imid.); T2 – Imid. + Polyether-polymethyl siloxane copolymer (Sil.); T3 – Imid. + MnSO4; T4 – Imid. + Sil. + MnSO4; T5 – Control (no application). Physical-chemical characteristics, spray deposition over the leaves and losses to the soil, guava psyllid percentage of infestation and nymph’s number were evaluated. The addition of foliar fertilizer on the mixture reduced the pH and surface tension and increased the electric conductivity and viscosity of the insecticide solutions. The silicon adjuvant reduced the surface tension and increased the viscosity and the pH. The tank mixture of organosilicon adjuvant and manganese foliar fertilizer do not influence the efficacy level of the insecticide.