policy of prevention in the first place and integrating prevention with control
Comprehensive infestation index
economic infestation level
grasshopper infestation
infestation
感染
侵害
为害
传染
侵扰
危害
感
污染
防治
危害调查
蔓延
发生
致害性
叮刺
[虫类]群袭
群袭
大批出没
叮咬
infestation characteristics
Infestation rate of cockroaches