The side effect of commonly used chemical pesticides on entomopathogenic Beauveria bassiana and Bacillus thuringiensis as biopesticides

الملخص EN

Biopesticides are considered to be the best alternative to chemical pesticides that are highly effective, target specific and reduce environmental risks.

Compatibility of bio and chemical pesticides is very important for effective pest management.

The aim of this work is to study the side effect of used pesticides on the viability of spores (active ingredient) in biopesticides.

The tolerance of Beauveria bassiana and Bacillus thuringiensis to eleven commonly used pesticides as indoxacarb, dimethoate, chlorfenapyre, abamectin, lambdacyhalothrin, chlorpyrifos, deltamethrin, profenofos, cypermethrin, methomyl and hexaflumuron were tested in the laboratory.

The results indicated that chlorfenapyre and abamectin were more compatible with B.

bassiana.

Also, there were not any side effect between them and the fungus.

Also, when used the mixtures of B.

bassiana and chlorfenapyre or abamectin to control the red spider mites, Tetranychus urticae Koch (Acari: Tetranychidae) were more toxic than use them individually.

On the other hand, chlorfenapyre, cypermethrin and methomyl had not any inhibition effect to B.

thuringiensis compared with other compounds.

The obtained results may be useful in the development of Integrated Pest Management strategies using beneficial control agents like microorganisms with chemical pesticides.