Taumetopoea pityocampa (Den. and Schiff) is one of the most common defoliator insects found in Turkey Although several methods have been used in attempting to control this major forest pest up to now but the problem still remains largely unsolved in Turkey There is an urgent need to control and minimize the damages caused by these defoliating caterpillars. Therefore, we planned and applied field treatments using by Foray 76B and VBC 60074 to put forward to the efficiency of these bioinsecticides against PPM. The bioinsecticides included in Bacillus thuringiensis subs p. kurstaki (Btk). The vulnerable performance of a single application has been observed in the held trial of these bioinsecticides with mortality rates ranging from 97 to 99% in Turkey's pine forests.