LABORATORY EVALUATION OF SHELLAC AS ULTRAVIOLET SCREEN FOR THE BACILLUS-THURINGIENSIS VAR. ENTOMOCIDUS AGAINST SPODOPTERA-LITTORALIS LARVAE

Shellac was evaluated as radiation protection for the bacterium Bacill us thuringiensis var. entomocidus against Spodoptera littoralis larvae . Shellac provided excellent protection to B, thuringiensis. The effic acy of shellac in the protection of entomocidal activity of B. huringi ensis var. entomocidus against UV irradiation has been studied. Result s obtained by the absorbtion and the bioassay of residual entomocidal activity of B, thuringiensis var. entomocidus after exposure to UV irr adiation showed that shellac is an excellent photpoprotective agent.