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栗山天牛Mallambyx radei(Bles-sic)在丰宁县是蒙古栎和辽东栎等栎属天然次生林重要的蛀干害虫之一。近几年来普遍发生且危害成灾,仅丰宁林管局王营林场危害面积达5000余亩。危害特点是阳坡重于阴坡,疏林重于密林,首先危害枝梢、进而蛀食主干,林木受害后千疮百孔,逐渐枯死,给林业生产带来极大损失。为了寻求经济有效的防治方法,我们自1985年始,对其生物学特性进行了野外观察。现将结果整理如下:该虫在丰宁为4年1 代。成虫6月下旬出现,夜间活动,有趋光性。7月上、中旬成虫在夜间产卵,卵产于树皮缝隙、枝条和伤痕等处。每次产卵1粒,并由产卵管内流出乳黄白色的液体将卵固定,而后液体变为浅茶褐色。细枝条以外的枝干也能产卵。卵期7—10天。孵化后的幼虫侵入树皮内危害树皮
One of the important stem borers in natural secondary forest of Quercus mongolica and Quercus liaotungensis in Fengning County is Mallambyx radei (Bles-sic). In recent years, widespread and endanger the disaster, only Fenglin Forest Management Bureau Wang Yinglin Hazard area of 5,000 acres. Harm is characterized by the sunny slope heavier than the slope, sparse forest heavier than the jungle, the first damage to shoots, and then eat stems, forest victims after riddled with holes, gradually dead, to forest production has brought great losses. In order to find a cost-effective control method, we have conducted field observations of its biological characteristics since the beginning of 1985. The results are now organized as follows: The insects in Fengning for 4 years 1 generation. Adults appear in late June, night activities, there is phototropism. In mid-July, mid-adults lay their eggs at night, producing eggs in bark crevices, branches and scars. Each time a spawn, and by the oviposit effluent milky white liquid egg fixed, and then the liquid becomes light brown. Branches other than fine branches can also lay eggs. Egg stage 7-10 days. After hatching larvae invade the bark endanger the bark