EFEITO DA ABAMECTINA E BIOESTIMULANTE NO MANEJO DE Pratylenchus brachyurus NA CULTURA DA SOJA

Abstract

The nematode root lesions (Pratylenchus brachyurus) has been causing severe damage to soybean cultivation in Brazil. Alternative management measures are of extreme importance for population reduction of this phytonematoid in infested areas. Therefore, the present work had the objective of analyzing the effect of abamectin and biostimulant on the control of Pratylenchus brachyurus in the soybean crop. Ten treatments were used: T1- Witness, T2-Abamectin (50 g ai / 100 kg seeds), T3- Biostimulant (200 mL bw / ha), T4-Abamectin (50 g ai / 100 kg seeds) + Biostimulant (600 mL bw / ha), T7- Biostimulant (600 mL bw / ha), T5- Biostimulant (400 mL bw / ha), T6- Abamectin (50 g ai / 100 kg seeds) , T8- Abamectin (50 g ai / 100 kg seeds) + Biostimulant (600 mL bw / ha), with eight replicates, in a completely randomized design. The use of abamectin alone favored the increase of the fresh root mass and reduction of juvenile / P. brachyurus eggs in the root of soybean plants. The isolated use of biostimulant and associated with abamectin, in the highest doses, obtained the largest population number of P. brachyurus / 10 g in the root. The multiplication of P. brachyurus was favored by the use of the biostimulant dose containing 200 mL p.c / ha. The treatments employed did not affect the population dynamics of P. brachyurus in the soil.