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据据Gerrard阈限密度法,采用无虫叶片占全部抽样叶的比率来估计矢尖蚧雌成虫和幼虫的平均密度,并给出了不同虫口密度和抽样精度下的理论抽样数。
According to the Gerrard threshold densitometry method, the average density of female and adult larvae was estimated using the ratio of non-insect leaves to the total number of sampled leaves, and theoretical sampling numbers for different insect population densities and sampling accuracies were given.