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准确快速地测定虫口密度是确定柑桔红蜘蛛防治适期的基础。笔者通过两年的田间系统调查,经统计分析,发现柑桔红蜘蛛成螨叶频率(有成螨叶片数/调查总叶片数×100%)与成若螨虫口密度存在着指数函数关系:Y=0.1437e~(0.0580x),可以不借助放大镜,直接用目测调查成螨出现的叶频率,依该预报式计算出成若螨虫口密度,是基层果场估测柑桔红蜘蛛田间虫口密度的一种简便快速的方法。
Accurate and rapid determination of insect population density is to determine the appropriate basis for citrus red spider control. Through two years of field survey, the author found that there was an exponential function relationship between the mite leaf frequency (the number of adult mite leaves / the total number of leaves under investigation × 100%) and the density of spider mites on the basis of statistical analysis: Y = 0.1437e ~ (0.0580x), without the help of a magnifying glass, the leaf frequency of mites can be directly investigated visually. According to the prediction formula, the population density of mites is calculated. A quick and easy way.