The ratio vegetation index(RVI)method is combined with field survey of insect pest to determine critical values of RVI for different degrees of disaster and the judgement accuracy reaches 73%.
利用比值植被指数（RVI）分析法，与实地虫灾调查相结合，找出了受虫灾影响后不同灾害程度的RVI临界值，判对率为73%。
The Taian Traditional Chinese Medicine Station as the major survey, the insect community in different temporal sequences was studied systematically.
以泰安药材站仓库为系统调查点，分析了不同时间序列上的群落数量特征。
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