Studies on the toxicity and joint - toxicity to propylaea japonica and chrysopa septempunctata of some insecticides 13种杀虫剂对龟纹瓢虫及大草蛉的毒力研究
The cotton bollworm had not been the domiant pest in transgenic bt cotton field , but the number of aphids , ded spider mite , whitefly and so on , increased obviously 害虫优势种是棉铃虫、花蓟马、棉蚜、朱砂叶蜻,天敌优势种类为蜘蛛类、七星飘虫、龟纹飘虫。
Ladybird propylaeajaponica & harmonia axyridis , ground beetle pseudoophonus griseus and ant lion chrysopidae were dominant natural enemies migrating with insect pests 龟纹瓢虫propylaeajaponica &异色瓢虫harmoniaaxyridis ,步甲pseudoophonusgriseus和草蛉是伴随害虫迁飞的主要天敌。
Fm screening , short for frequency modulation screening , is a pew technology in today ' s graphic arts , which can avoid moire effectively , increase productivity , and improve product quality 调频加网技术是印刷行业的一项新技术,它能有效消除龟纹的影响,提高生产效率和印品质量。
Transgenic bt cotton mainly affect high - instar larvae by retarding the growth and intering the proceeding of ecdysis , pupation , and eclosion . the growth retardation leads to the postponement of growth period duration ( the showed that growth period duration prolonged 17 days ) . feeding the larvae with the tissue of the transgenic bt cotton and the moths with the flower of transgenic bt cotton , the number of eggs and hatching rate decreased obverviously 转基因药防田中,天敌昆亚群落的个体数占整个昆虫群落总个体数的10 . 0 % ,其优势种为蜘蛛类、七星瓢虫( coceinellas叩te即uneitatalinnaeus ) 、龟纹瓢虫( prol , laea少只ponjcagoeze ) 、大眼蝉长蜷( prqp . ylaeajaponicagoeze )和草岭(助rys叩asepre即unetatawesmael ) 。