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近两年来,在扎兰屯市国营、集体、个体杨树苗圃中,发生大量的杨叶蜂。该害虫属膜翅目、叶蜂科,以幼苗虫口较大,被害率,达100％,轻者达70％以上。据在扎兰屯市育苗个体户范万宝家调查,二年生幼株平均虫口达300多头。幼虫喜集中蚕食,幼株中下部叶全部食光,只余叶脉,对其幼株的生长造成十分严重的影响。市林业局病虫害防治人员结合杨树抗病虫树种的调查,对
In the past two years, a large number of poplar bees have emerged in state-owned, collective and individual poplar nurseries in Zhalantun City. The pest is Hymenoptera, the leaf bee family, the seedling insect population larger, the victimization rate, up to 100%, light more than 70%. According to surveys conducted in Zhalantun Municipality nurturing self-employed households Wanbao home, the average annual pest population of biennial up to 300 bulls. Larvae eager to nibble, young leaves in the lower part of all the food, leaving only the veins, the growth of their young have a very serious impact. Municipal Bureau of forestry pests and diseases prevention and control personnel combined with poplar pest-resistant species of the investigation