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The Remote Sensing Analysis and Evaluation of Planthopper Harm on 2006 in Jingzhou City

XIONG Qin-xue①,WU Tao②(① Agriculture College Yangtzeu University,Jingzhou 434025;② Plant Protecting Station of Jingzhou,Jingzhou 434100)  
According to comparison of NDVI changes of normal years(2001、2005) with planthopper year(2006),that the average NDVI values from heading to mature stage are significantly lower than normal years.The reason is related to the planthopper number per hundred shoots;the planthopper harmfulness classification according to this rule is put forward.This is a new way to calculate the planthopper harmfulness.
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