调查三化螟卵块孵化进度,了解三化螟卵块的孵化情况,是确定用药时间不可缺少的工作。以往采用随机采卵法来调查,结果孵化进度往往偏低。这是因为三化螟盛蛾期一般都在7天以上,有的长达20余天,随着时间的延长,水稻植株日益增高,叶片增多,前期产的卵到后期看来,都在植株的中下 Investigate the progress of the hatching of the pyramiding eggs, understand the incubation of the pyramiding eggs, which is an indispensable task to determine the time of treatment. In the past, random ovulation method was used to investigate the results of hatching progress is often low. This is because the three Borer moths are generally more than 7 days, some as long as 20 days, with the extension of time, increasing rice plants, leaves increased, the pre-production eggs to the late appears, are plants Middle and lower