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。
The front-end system of crop plant diseases and insect pests' ground survey was a very important tool which could continually observe the farm and maintain the survey data.
农作物病虫害地面调查前端系统是对长期田间观察和调查数据维护的重要工具。
The paper reports the results of survey on different species of destructive insect against bamboo and wood in 135 spots of Chengdu region from 1994 to 1997.
我们自1994～ 1997年对成都市范围内各区县的竹木用材蛀虫危害情况进行了初步调查。
The paper reports the results of survey on different species of destructive insect against bamboo and wood in 135 spots of Chengdu region from 1994 to 1997.
我们自1994～ 1997年对成都市范围内各区县的竹木用材蛀虫危害情况进行了初步调查。
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