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Abstract: Suspensions of spores and parasporal crystals of Bacillus thuringiensis var. israelensis (BTI) have been shown to be effective in controlling larvae of Lycoriella mali (Diptera: Sciaridae) in laboratory and commercial-scale experiments. In commercial trials with Agaricus mushrooms, crops treated with high rates of BTI yielded an average of 318 g/ft2 more mushrooms than comparison crops. In the laboratory, the crop response to BTI treatments ranged from 8 to 19% greater yield. Radiotracer experiments in which C14 labeled glycine or acetate were used to label suspensions of BTI, demonstrated significant metabolism of the BTI concentrate after application to spawn run compost. Radiolabel did not leach significantly into the compost and was readily taken up into the mycelium and sporophores.
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