论文部分内容阅读
近年来草地螟在北方连年大发生,危害甚大,必须引起重视。草地螟幼虫能迅速地通过低龄阶段,进入暴食期,危害时间短,抗药性强,稍微疏忽就可能错过防治适期,农作物就有被吃光的危险。同时幼虫还能群集迁移继续危害,给农作物带来更大的损失。因此,及早预报幼虫的防治时期,做好药械准备,做到及时有效地防治是控制草地螟危害,保证农作物丰收的关键。根据几年的饲育观察和实际发生情况的调查,草地螟在自然条件下,旬平均气温20℃左右,卵期3天
In recent years, Meadow borers occur year after year in the north, which is very harmful and must be taken seriously. Grasshopper larvae can quickly through the early stages, into the gluttony period, the harm of time is short, strong resistance, a little negligence may miss the control period, the crop has the risk of being eaten. At the same time, the larvae can continue to be harmed by the cluster migration and bring greater losses to the crops. Therefore, it is the key to control the damage of Meadow Stem Borer and ensure the bumper harvest of crops by forecasting the control period of larvae as early as possible. According to several years of feeding observation and the actual occurrence of the survey, Meadow borer in natural conditions, the average temperature of about 20 ℃, the egg period of 3 days