易门地区苹果棉蚜的危害特性及其防治试验

为有效防治易门地区危害渐趋严重的苹果棉蚜，开展了该虫害危害特性以及药剂防治的研究。据观察，苹果棉蚜在易门1年发生20代，3月中旬至10月中旬是1、2龄若蚜繁殖危害最严重的时期，果实采收后至树体萌发前是防治的最佳时期。不同药剂的防治试验结果表明40％的氧化乐果1800倍液加1％o的洗衣粉是防治苹果地上部分棉蚜的较佳药液；另每株根施0．25kg高丙体内吸粉剂对根部的苹果棉蚜具有较好的杀灭作用。3年来，以化学防治为主，辅以配套的综合防治及检疫技术措施，使易门40．8hm2苹果园的植株受害率由48．5％降至2．65％，取得了较好防治效果。

The Experiment on Harm Characteristics and the Control of Eriosoma lanigerum in Yimen District

In order to control Eriosoma lanigerum in Yuxi effectively, the experiment cn the harm characteristics and chemical control was conducted. It was observed that 20 generations of Eriosoma lanigerum appear in a year in the district, from middle of March to middle of November is the period that 1 and 2 age nymphaphid reproduce and harm most seriously. The period from fruit taking to tree generation is the best time for control. The result of experiment on different chemical control shows the best chemicals for cootrol Eriosoma lanigerum in the part trees above ground is 40% omethoate adding 1‰ washing powder (the ratio is 1:800). Applying 0.25 kg fortified benzene to the root of each tree can kill Eriosoma lanigerum in the root. In the past three years, chemical control as first, complementary with the measures of integrated control and quarantine techniques, the percentage of suffered trees in Malus pumila garden of 40.8 hm2 in Yimen County has decreased from 48.5% to 2.65%.