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期 刊 ：植物保护学报 1989年

关键词：矢尖蚧；种群密度；简易估计法；

Keywords:Unaspis yanonensis, population density, easy ways to estimate,

摘 要 ：本文根据Iwao的零频率法和Gerrard等的阈限密度法,采用无虫叶片占全部抽样叶的比率来估计矢尖蚧雌成蚧和幼蚧的平均密度,并提出了不同虫口密度和抽样精度下样本量的确定方法。

Abstract:According to Iwao‘s zero frequency method and Gerrard‘s thresh-old density method,the densities of the female and nymph of Unaspisyanonensis Kuwana on citrus were estimated,depending on the frequen-cy of leaf without this pest.The optimum numbers for samp

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