The Role Of Beauveria Bassiana In The Biological Control Of The Different Stages Of The Clover Weevil Hypera Postica

Abstract

A laboratory study was conducted to evaluate the effect of the biological resistance factor Beauveria bassiana on the different roles of the clover weevil Hypera postica using three concentrations (1×102, 1×104 and 1×106) spore/ml. The results of the study showed that the concentrations used differed in the rates of laboratory fatality of larvae, pupae and adults of the clover weevil Hypera postica. The results also showed that the mortality rates increase with increasing concentration, as the concentration 1 x 106 spores/ml recorded the highest mortality rate compared to the other studied concentrations, after 96 hours of treatment, as the mortality rates reached (74.8, 72.9, 70.4, 69.7, 50.3 and 42.1) % for the first larval instar, second larval instar, third larval instar, fourth larval instar, pupa and adult respectively Compared to the lowest mortality rate recorded 6.873 % at the concentration of 1 x 102spore/ml after 24 hours of treatment.