Question

Bacillus thuringiensis subsp. kurstaki   (Btk) strains used in biopesticides for cotton are formulated as wettable powders or liquid suspensions, but their field efficacy is often limited by?

A The inability of Btk to survive in alkaline soil
B Rapid degradation of the Cry proteins by ultraviolet (UV) radiation in sunlight
C The lack of specific receptors in bollworm guts
D Instantaneous volatilization at high humidity
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