研究树木的叶量对害虫预测预报有着重要意义。为此在大袋蛾预测预报中就如何应用泡桐叶量与冠幅的回归方程式问题进行了研究,兹将研究结果介绍如下。 在春季调查大袋蛾越冬基数时,所用的密度单位是头/株,但树有大有小,冠幅大的泡桐叶量,往往为冠幅小的许多倍。因此,应用这一单位不能确切地反映虫口密度 Studying the leaf amount of trees is very important for the prediction and forecast of pests. Therefore, in the prediction and prediction of big-bagged moths, the problem of how to apply the regression equation of leaf volume and crown width of paulownia was studied. The results of the study are as follows. The density unit used for surveying the wintering moth in the spring is the head / plant, but the tree has large and small, large crown Paulownia leaf volume, often many times smaller than the crown. Therefore, the application of this unit can not accurately reflect the population density