Objective To observe the effects of different methods of cockroach killing effect,to find suitable ways of cockroach killing.Methods The four restau-rants,the first using a spray method;the second using gel bait against cockroaches processing;the third using the spray first,and gel bait against cockroaches processing;the fourth stop using gel bait against cockroaches .Results The first restaurant cockroach density decreased by 99 .6% after the atomized spray ,Two months after return to previous density;the second cockroach density decreased just a lit;the third cockroach density decreased 99.4%,two months after the cockroach density did not re-bound;the forth cockroach density increased to 34.2 one pieces.Conclusion Drug spray can quickly kill most cockroaches,a short period of time will reduce cockroach gel bait,cloth on cockroach density is low for long-term control of cockroach density.
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