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实践证明:六六六防治稻螟,必须正确掌握螟卵盛孵期,然后根据苗情,做到适时施药,才能取得最大的防治效果。但在大面积防治工作上,如何指导群众掌握螟卵盛孵期,仍是一个问题。按照全国稻螟测报办法,螟卵孵化进度的计算,有绝对孵化率和相对孵化率两种。前者要到产卵停止后才能计算出来,只能用于验证螟卵盛孵期预测的准确性。后者,虽可根据田间检查结果及时计算出来,但因其增长速度不够稳定,也会产生用药失时。浙江农
Practice has proved that: BHC control rice stem borer, we must correctly grasp the borer egg Sheng Sheng incubation period, and then according to the seedling situation, timely application, in order to achieve the greatest control effect. However, on a large scale prevention and control work, how to guide the masses to master the hatching period of borer ovules is still a problem. According to the national method of measuring rice borer, hatching eggs borer progress calculation, there are two kinds of absolute hatching rate and relative hatching rate. The former can not be calculated until the spawning stops, and can only be used to verify the accuracy of prediction of the stem-ovum larvae incubation period. Although the latter can be calculated on the basis of field inspection results in time, its lack of stability will also result in the lapse of medication. Zhejiang farmers