A Preliminary Study on Spatial Distribution Pattern and Life Table of Dendrolimus punctatus tehchangensis in Yuanmou County

The study on the spatial distribution pattern and life table on Dendrolimus punctatus tehchangensis indicates that the distribution in forest stand is in the form of congregation that results from their behavior.The most suitable number of sample trees is as follows:N=281.4/x+48.4.The parasite bees and flies are the major affecting factors.The prime death appears in pupa caused by the above two factors except for the natural death in the first and the second instar larva of the first generation.