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 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%。
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