新疆酿酒葡萄瘿螨发生规律初探

The study of first step on occurrence regulation of Xinjiang wine grape Colomerus vitis

通过对葡萄瘿螨,即毛毡病空间分布型进行的研究与分析,结果表明:葡萄瘿螨种群在田间分布呈聚集分布,符合负二项分布。以此空间分布型进行序贯分析,确定了阈值密度:即百株葡萄瘿螨虫苞数在30个以下时,未达到防治指标;百株虫苞数超过50个以上时,达到防治指标。其概率保证为95%,即必须防治而误认为无需防治的误差为α(0.05),尚未达到防治指标而误认为需要防治的误差为β(0.05),计算出了有关参数和两条平行线的截点和斜率。在以累积虫苞数为纵坐标、抽样次数为横坐标的图上,标出“接受”和“拒绝”的区域。

Confirm distribution of Colomerus vitis, Eriophyes vitis Pagenstecher in field by collecting and treating the. datum. The result showes that the distributing of grape Colomerus vitis accord with congregate distributing,and accord with negative two items distribution greatly. Under the spatial distribution, confirm threshold density: when the number of gall per 100 wine grape Colomerus vitis under 30, it does not reach index of control. It would reach index of control if the number of gall per 100 wine grape Colomerus vitis more than 50. The probability pledge is 95%. This means the error (the hurt pest conduced need control but have not consider it) is α(0.05),on the contrary isβ(0.05). We made a graph and vertical is number cumulated of gall, abscissa is sample times, line out“accept”or “unaccept”in graph.