EFFECT OF SALSELIC ACID, POTASSIUM SULPHAT, BORIC ACID AND ASCOBEIN ON MOVING STAGES OF Tetranychus Urticae KOCH INFESTING SOYBEAN PLANTS AND ITS YIELD

The soybean plants were fertilized with two methods chemical and bio fertilizers and each method soybean plants were sprayed with vertimec, salicylic a.; potassium sulfate (k2so4); boric acid and ascobein to reduce the mobile stages of t. urticae and determined the yield in two successive seasons (2013 and 2014). in the first season (2013), soybean plants was fertilized with the chemical fertilizers; the results indicated that salicylic a. with five concentrations (50, 100, 150, 250 & 300 mg/l),potassium sulfate with two concentration (5 & 10 mg/l), boric acid with three concentrations (0.8, 1.2 and 1.6 mg/l) and ascobein 0. 25% reduced the population of the mobile stages of t. urticae comparing with the recommended compound (vertimec).statistical analysis of 2013 season showed highly significant differences between the tested natural compounds and seed yield/feddan. in the second experiment, soybean plants was fertilized with bio and chemical fertilizers; the results indicated that salicylic a. with five concentrations, potassium sulfate with two concentration, boric acid with three concentrations and ascobein reduced the population of t. urticae comparing with the recommended compound (vertimec). statistical analysis of 2013 season show highly significant differences between the tested natural compounds also between the seed yield/feddan. it was found when spraying with natural compounds reduce the loss of yield especially high concentrations of these compounds and recommendedcompound (vertimic).results also indicated that soybean infestation with the mobile stages of t. urticae higher in case chemical fertilization experiments compared with bio fertilization experiments.in the second season (2014) the similar results compared with those obtained in first season (2013).