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梨木虱是我省梨区的重要害虫之一,近年发生严重,叶片被害后出现坏死斑点,其大量排泄物粘于叶面和果实,引起霉菌寄生,不仅影响树体发育,而且使果实失去商品价值。梨木虱每年发生4—5代,以成虫在树皮缝、树洞和落叶下越冬。在早春花芽萌动期,成虫开始出蛰到小枝上活动刺吸汁液。花芽膨大时大量产卵,花蕾出现时,卵开始孵化。4月下旬出现第一代成虫和第二代卵。随着生长季节的到来,叶片展开,梨木虱世代交混发生,若虫分泌胶液,药效难以充分发挥,稍
Pear lice is one of the major pests in the pear area in our province. In recent years, serious necrosis occurs after the leaves are killed. The large amount of excrement sticks to the foliage and fruits, causing mold parasites, which not only affects the development of the tree, but also loses the fruits value. Pythium occurs 4-5 generations per year, with adult bark wintering, tree holes and fallen leaves. Buds in early spring budding period, the adult began to sting on the twig activities sucking juice. Flower sprout large number of spawn, buds appear, the eggs began to hatch. The first generation of adult and second generation eggs appeared in late April. With the advent of the growing season, the leaves unfold, the generation of pear psylla mixed, nymphs secreting glue, efficacy is difficult to give full play, slightly