紫胶虫种群密度变化与泌胶的研究

Studies on Population Density and Secretion of Lac Insect

The population density and secretion of lac insect (Kerria chi-nensis Mahdihassan) in winter and summer generations have been studied in this paper. The research results have shown that the secretion of female adult is about 95% of total secretion, the secretion of larvae is very little, the population density of female adult in late period of winter and summer generations, 20~30 bodies/cm2, is favourable for secretion. In winter generation, the highest secretion of lac insect parasitizing Dalbergia balan-sae Prain is about 10.60mg/ , and its population density is 25 bodies/cm2; in summer generation, the highest secretion is 15.64mg/ , and its population density is 27 bodies/cm2. Lac insect smoothly secrete in winter generation and flourishingly secrete in summer generation. In summer generation, there is a high secreting period in pregnant female 3~4 stages, population density is 35~40 bodies/cm2. Other biological characters of lac insect have also been discussed in this paper.