Abstract:

This paper firstly reports the use of Bacillus thuringensis (Bt) aerosols in the pulse-jet fogger to produce smog to kill insect pests.Bt in Bt aerosols still remains vigour on NB medium and virulence to silkworms.Among the three kinds of oil tested,diesel oil is the best one for Bt gemmae vigour,diffusion in smog,and suspensibility in the oil.In addition,the model of shower nozzle of pulse-jet fogger is an important factor for Bt vigour.To sum up,the technique of Bt aerosols produced by pulse-jet fogger is a new, simple and feasible way for the control of insect pests.

Key words: Bacillus thuringiensis powder, Aerosol, Pulse-jet fogger