【摘要】 杨白潜叶蛾是为害杨树幼苗、幼树的一种较严重的害虫。幼虫在表皮下潜食叶肉,形成黑色虫斑。在河北易县为害多种杨树,其中毛白杨、唐柳虫斑面积占全株叶片面积达20％以上,严重影响光合作用的进行,树势衰弱,往往提早落叶。 此虫在易县一年发生四代,9月中旬至10月上旬相继以蛹作“工”字形茧在树干树皮缝内、落叶上越冬。同时有一小部分蛹羽化,成虫交配后产卵并孵化,但小幼虫在10月下旬全部冻死在潜叶上。成虫在4月中旬开始出现。有趋光性。产卵在叶片正面贴近主脉或侧脉,通常5—7粒卵排列成行。每头雌虫平均产卵量为49粒。幼虫孵化后从卵壳底面(与叶正面表皮接触处),咬破卵壳潜入叶组织内取食叶肉。 防治方法:秋冬季节在苗圃、幼林内大量扫集落叶,可消灭一定数量的越冬茧;根据室内和苗圃大面积防治幼虫试验,用40％的乐果乳剂1:1,000倍液喷洒叶面,毒杀潜叶内的幼虫效果很好。更多还原

【Abstract】 1.The poplar leaf miner Leucoptera susinella Herrich-Schaffer is a serious pest of young poplar trees and the infested areas by the larvae form dark sears on the leaves.In Yi County of Hopei Province several species of poplar trees are infested,among which Populus tomentosa and P.sp.suffer a damage of foliage areas above 20% which would retard the growth of the trees.2.This insect has four generations in Yi County and overwinters in the pupal stage which is encased in a "I"-shaped cocoon usually in the crevice on the bark oron the fallen leaf in the late September or early October.A portion of the pupae may emerge into adults which lay eggs after copulation.But the young larvae cannot survive under the low temperature of late October.The adults emerge at the middle of the next April.They are positively phototactie and will oviposit on the upper surface of the poplar leaves along the midribs or side veins.About 49 eggs will be laid by each,female in average and they are grouped linearly in five to seven.The newly hatched larvae bore into the leaves in the vicinities of the eggs.3.To clean up the fallen leaves in the nursery during winter can destroy a portion of the cocoons.Spraying the leaves with 40% Roger at dilution 1:1,000 is effective to kill the mining larvae.更多还原