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本文提出以虫口密度、虫口动态,以及危害量(包括取食量和残害量),并查定林分针叶蓄积量,确定林分针叶被害率,作为判断落叶松毛虫(DendroIimus superans(Butler))虫情的基础。文中提出了落叶松毛虫对落叶松(Larix olgensis)、油松pinus tabulaeformis)、红松(P、koriensis)、樟子松(P、sylvestris var.mongolica)等树种的取食量、残害量和总危害量的观测值,并根据220株落叶松针叶量的实测数据编制的落叶松针叶量查定表.应用时以林分平均胸高直径即可查定林分平均针叶量。根据虫口密度,查定林分针叶蓄积量即可大致预测林分针叶被害率,确定危害等级,作为制定控制措施的参考。
In this paper, the density of insects, the dynamics of the population and the amount of damage (including the amount of food intake and the amount of damage) were determined. The amount of coniferous stock in the stands was determined, and the rate of coniferous trees in the stands was determined as DendroIimus superans (Butler) Insect basis. In this paper, the feeding, residual and total population of Larix olgensis, Pinus tabulaeformis, P, koriensis and P, sylvestris var. Mongolica were proposed. According to the survey data of larch coniferous needles of 220 larch coniferous plants, the average coniferous quantity of coniferous forest can be determined by the average diameter of chest height of the stands. According to the density of the population, the amount of coniferous stock can be roughly estimated to predict the coniferous and tree damage rate, and the hazard grade can be determined as a reference for the formulation of control measures.