Studies on the Natural Enemies of Gypsy Moth,Lymantria dispar(Lep.:Lymantriidae)in Dayi,Sichuan Province STUDIES ON INSECT NATURAL ENEMY DIVERSITY OF GYPSY MONTH AND THEIR ROLE IN NATURAL CONTROL OF THE PEST (LEPIDOPTERA: LYMANTRIIDAE) IN BEIJING AREA Evaluating Alfalfa Cutting As a Potential Measure to Enhance Predator Abundance of Aphis gossypii(Homoptera: Aphididae) in Cotton-alfalfa Intercropping System Studies of hemocytes DNA damage by two pesticides acetamiprid and chlorpyrifos in predaceous spiders of Pardosa astrigera Koch