茶橙瘿螨的三级和四级调查方法

Studies on the 3-grade and 4-grade Investigating Methods of Pink Tea Mite (Acaphylla theae Watt)

经对３８组调查数据的统计分析，提出了一种三级和二种四级茶橙瘿螨分级调查方法。三种方法算出的螨情指数与实测螨口密度呈极显著的正相关。两种四级法的螨情指数转换成螨口密度，与实测螨口密度相符或基本相符，达到与六级法同等符合水平。三、四级调查方法的优点是，比六级法省力、省工，有利于提高螨口记数的准确性，螨情指数的计算方法也较简便。

Based on the statistic analysis of 38 groups of data from investigation ,this article brought out a 3～grademethod and two 4-grade methods of grading investigation on pink tea mite(Acaphylla theae Watt).The miteinfestation indexes calculated by the three methods were significantly positive一correlated with the observedpopulation density. The mite population densities transformed from the mite infestation indexes by the two 4一grade methods were coincided with the observed population density, reaching the accuracy by the 6-grademethod. Compared with the 6-grade method,the 3-grade and 4-grade methods possessed the advantages of la-bor-saving and short work time,resulting in a higher accuracy for counting the mite population and a easiercalculation of mite infestation nindex.