一、危害情况落叶松卷叶蛾是危害落叶松的一种新害虫.1967年此虫于黑龙江省勃利县通天一林场大面积发生,其中三万余亩落叶松纯林受到不同程度的危害,虫口密度高达2,391条/株.树冠中、下部针叶被食尽,仅剩枝条残叶,被害林木一片枯黄,似火烧,林缘受害尤甚.被害植株次年发叶晚,叶色浅绿,枝条亦脆,一触即折,连续三年危害,严重影响林木健壮成长,有的幼小植株 First, the damage Larch leaf roller moth is a new pest endanger the larch in 1967, this worm in Boli County, Heilongjiang Province, a large area of ​​Tiantian first forest, of which more than 30,000 acres of pure L. larvae are subject to varying degrees of harm, insects mouth The density of up to 2,391 / plant canopy crown, the lower part of the conifer is depleted, leaving only the residual leaves, the victim of a yellowish forest, like fire, especially the forest edge victimized plants the following year late leaves, light green leaves, Branches are also crisp, a one-touch, for three consecutive years endangering, seriously affecting the robust growth of trees, and some young plants