Effect of Larvae Treated with Mixed Biopesticide Bacillus thuringiensis - Abamectin on Sex Pheromone Communication System in Cotton Bollworm, Helicoverpa armigera
Biopesticide usage is increasing every year, even more with the prespective that mixtures of pesticides are theoretically more effective in delaying resistance than alternating usage of pesticides . An example of this strategy is the conjugation of the toxins from Bacillus thuringiensis with the toxin of abamectin, to form a new biopesticide called BtA . This BtA mixture has been widely used to control agricultural pests  and the usage of BtA was in the hundreds of tons in several provinces of China in 2011. Many researchers have demonstrated that pesticides impact natural enemies directly or indirectly . The longevity of Microplitis mediator, a parasitoid of the cotton bollworm (Helicoverpa armigera) decreased significantly after being fed with 10% honey water containing a sublethal dose of a Bacillus thuringiensis and abamectin (BtA) .