论文部分内容阅读
据1974～1985年观察,用粘虫卵孵化率和卵量与田间虫量的相关性进行发生期、发生量预测,准确可靠,方法简单,而产卵高峰在预测上意义不大,现将有关材料整理如下:一、发生期预测1、自然落卵量观察:采用五市尺竹杆,将4根粳稻草对折,折的一端朝下,系在竹干上做成草把,选择大小麦田六块,每块田插十个把,计六十个把每年自2月14日至4月24日自然诱卵期间,每三天换一次把,检查卵块数,历年产卵实况,全代卵量及其平均产卵进度,详见表1。
According to the observation from 1974 to 1985, the incidence of hatching rate and oviposition of the armyworm and the number of eggs in the field occurred at the occurrence and the occurrence of the quantity was accurate, reliable and the method was simple. However, the spawning peak had little significance in predicting The material is organized as follows: First, the expected period of occurrence 1, the natural observation of the amount of oat eggs: bamboo rod with five city feet, the four japonica straw fold, fold down at one end, tied to the stem made of grass, select the size Wheat field six, each field inserted ten, count sixty every year from February 14 to April 24 during natural ovulation, every three days to change, check the number of eggs, the annual spawning live, all The generation of egg and its average egg laying progress, as shown in Table 1.