木毒蛾空间分布型及其应用和综合治理的研究

本文采用比较频次法和聚集度指标法，测定木毒蛾各虫态的分布型。应用Ｉｗａｏ方法，计算各虫口密度下的林间最低抽样数，分析了中幼林中幼虫序贯抽样。研究表明，木毒蛾各虫态（卵块、幼虫、蛹）在木麻黄防护林中呈聚集分布，幼虫以聚集型扩散。幼虫在中低密度下，以对角线和棋盘式取样最佳，卵块以对用线取样最佳。对木毒蛾的防治应以营林措施为基础，坚持生物防治，可以有效地控制其虫口密度。

Studies on the Spatial Distribution Models of Lymantria xylina and Their Application and Comprehensive Harnessing

This article adopted the comparative frequency method and the crowding level index method to determine the distribution models of various insect morphologies of Lymantria xylina and applied the lwao method to calculate the lowest sampling number in the forests under various population densities and analyze the sequential sampling of larvae in the middle-aged and young forests.The studies revealed that the various insect morphologies(egg masses. larvae and pupae)of L. xylina assumed the crowding distribution in the protective forests of Casuarina and the lar-vae spread by taking the crowding model.Under the middle and low densities,the diagonal sam-pling and the chequered sampling were optimum for the larvae and the diagonal sampling was opti-mum for the egg masses. The silvicultural measures should be taken as the base and the biological control should be upheld for controlling L. xylina and therefore the population densities could be effectively controlled.