An Investigation on the Pathogens of Both Lac Insects and Their Host Plants A Study on the Adaptability Response between the Lac lnsect and lts Host Tree STATUS AND PROSPECTS OF SCHLEICHERA OLEOSA‘S PROPAGATION Analysis of Karyotype and Evolution Trend in Seven Species of Lac Insects in Genus Kerria Natural Distribution,Drought-resistant Nature and Moisture Physiology of Fine Host Trees for Lac Insects On the Male Acdeas of Four Species of Lac Insects and Preliminary Cross Breeding Test The Current Advances and Prospect of Lac Researches in China