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近年来梨木虱危害猖獗,已成为我省广大梨产区的主要虫害。笔者曾在石家庄梨产区和秦皇岛梨产区观察,发现大多数梨园都遭受梨木虱的危害,严重地影响了梨果产量和品质。因此加紧梨木虱的测报工作和制定相应的防治措施,已成为梨产区广大果树工作者迫在眉捷的问题。一、发生规律: 梨木虱在我省北部梨区如昌黎、秦皇岛一带,一年发生4代;中南部梨区如石家庄以南地区,一年发生5—6代。越冬代成虫和第一代若虫发生比较集中,以后各代虫态发生重迭,防治较困难。越冬成虫一般于明下旬到lO月份陆续进入越冬状态,越冬部位在树皮缝、树洞或落叶上。
Pear lice in recent years, the dangers rampant, has become the majority of pear pests in our province pests. The author once observed in Shijiazhuang pear producing areas and Qinhuangdao pear producing areas and found that most pear orchards were endangered by pear psylla and seriously affected the yield and quality of pear fruit. Therefore, to step up the reporting of pear psylla and to formulate corresponding prevention and control measures have become the pear-producing areas the majority of fruit-tree workers in the eyebrow problem. First, the law occurs: pear psyllids in the northern province of pear province such as Changli, Qinhuangdao area, occurred four generations a year; central and southern pear area such as Shijiazhuang south area, occurred 5-6 generations a year. Overwintering generation of adult and the first generation of nymphs occurred more concentrated, after the generation of overlapping occurs in the state of insects, prevention and control more difficult. Overwintering adults are generally late tomorrow to lO months one after another into the wintering state, overwintering parts in bark joints, tree holes or fallen leaves.