LIFE TABLE OF TOMICUS-PINIPERDA (L) (COL, SCOLYTIDAE) AND ITS ANALYSIS

A life table was developed for the pine shoot beetle, Tomicus piniperd a (L.), on the basis of two consecutive years of field research in Kun ming, China. Based on the analysis of the life table, intraspecific la rval competition, pine resin, parasitoids, predators and the other unk nown factors composed the main factors affecting insect mortality. Amo ng them the intraspecific larval competition contributed to highly pro portional mortality of the population, approximately 39.85%, and was s upposed to be a major factor determining productivity of the insect. T he second highest proportional mortality, around 20.59%, was attribute d to pine resin. The percentage of unknown mortality was 13.37%, in wh ich temperature and humidity as well as forest hygiene were involved. For different stages the larval mortality of 52.38% was the highest co mpared with others, and therefore played the greatest role in the popu lation mortality process. The mortality rate for the adult, egg and pu pa was 15.5%, 5.8% and 2.7%, respectively. The generation mortality ra te of 78.24% indicated a increasing population in Kunming over the stu dy years