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根据桔全爪螨危害柑桔叶片,其个体散布于柑桔嫩梢、枝条等生物学习性,以及桔园这一特定的环境条件,我们认为,对桔全爪螨种群的抽样策略至少应包括:最适样本单位;树冠最适抽样部位;在给定的估计精度和种群密度水平下,应抽取多少株桔树、每株被抽取的树内又应抽多少张叶片,才是最佳配额?基于1980—1984年的调查资料,我们具体探讨了这三方面的问题,现报道于后。
According to the citrus holm mite harm citrus leaves, the individual scattered in fresh shoots of orange, branches and other biological habits, as well as the orange garden this specific environmental conditions, we believe that the population of the full mite population sampling strategy should include at least : The most suitable sample unit; the optimum sampling site of the canopy; how many orange trees should be extracted at a given level of estimation accuracy and population density, and how many leaves should be taken per tree Based on the survey data from 1980 to 1984, we have specifically discussed these three issues, which are reported later.