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Exposure of Beauveria isolates to a set of abiotic factors such as temperature, organophosphorous pesticide and benzimidazole fungicide lead to the expression of several stress related proteins under unfavorable conditions. Novel protein bands corresponding to low and high molecular weight categories were recorded in the isolates exposed to the three abiotic stress factors. The SDS – PAGE protein profiles in the negative controls differed from positive controls in the absence of some of the protein bands. Selected isolates of Beauveria from the present study displayed similar banding pattern in response to exposure to a given stress factor. It is assumed that the synthesis of stress proteins is intended for their survival and adaptation to adverse conditions.