论文部分内容阅读
梨星毛虫是我国梨和苹果产区的重要害.虫之一,60年代以前主要以DDT控制。有机氯杀虫剂禁用后,此虫又有回升,在粗放管理的果园损失尤为严重。作者于1983—1985年在河北省廊坊地区筛选杀卵与防治出蛰幼虫的药剂,近年已在生产中推广。 一、室内药效试验 供试药剂为40％乐果乳油(1000、2000倍)、50％对硫磷乳油(1500、3000倍)、50％地亚农乳油(1000、2000倍)、50％敌敌畏乳油(800、1600倍)、50％辛硫磷乳油(1000、2000倍)、50％杀螟松乳油(1000、2000倍)、20％杀灭菊酯乳油(2000、4000倍)、2.5％溴氰菊酯乳油(2500、4500倍)。 (一)杀卵试验 田间采集梨星毛虫卵块,按以上药剂和
Pear is one of the most important insect pests in pear and apple producing areas in China, mainly controlled by DDT until the 1960s. After the banning of organochlorine insecticides, the insect picked up again and the losses were particularly serious in extensively managed orchards. The author in 1983-1985 Langfang area in Hebei Province to kill eggs and control of sting larvae agents, in recent years has been promoted in the production. First, the indoor efficacy test for the test agent is 40% dimethoate EC (1000,2000 times), 50% parathion EC (1500,3000 times), 50% toolazepion (1000,2000 times), 50% 50% phoxifen (1000,2000 times), 50% fenitrothion EC (1000,2000 times), 20% fenvalerate EC (2000,4000 times), 2.5 % Deltamethrin EC (2500, 4500 times). (A) oviposition test field pear caterpillar eggs collected, according to the above agents and