稻飞虱、浮尘子是一类容易暴发成灾的害虫。是夺取早稻稳产、高产的主要矛盾。预计今年将是严重发生年。主要依据是:(一)发生早,四月二十日调查,第一代浮尘子若虫期比去年同期提早三十一天,稻飞虱提早七天;(二)发生量大,四月二十一日调查,白翅浮尘子每亩三万六千只,其中若虫百分之八十五点七,比去年同期增加一点二倍,白背飞虱每亩三千六百只(均是若虫)此去年同期增加一点五倍;(三)据气象部门预报,五、六月份雨量多,七月份干旱,气侯条件有利稻飞虱、浮尘子猖獗危害。为了摸清稻飞虱、浮尘子发生消长规律,搞好预测预报,指导大田防治工作。近年来我们作了一些系统观察和大田调查,现整理如下。 Planthoppers, floating dust is a type of pest prone to outbreaks. It is the main contradiction in seizing stable and high yield of early rice. It is estimated that this year will be a serious year. The main basis is: (1) As early as April 20 investigation, the first generation of nymphs of floating dust noodles were thirty-one days earlier than the same period of last year, and the planthoppers lasted seven days earlier; (2) On the 1st day of the survey, the floating bugs of Baiji were 36,600 per acre, including 85.7% of nymphs, a doubling of that of the same period of last year and 3,600 per acre of white-backed planthoppers Nymphs) increased 1.5 times over the same period of previous year; (3) According to forecasts by the meteorological department, there were more rainfalls in May and June and drought and climatic conditions in July are favorable to rampant planthoppers and floating dust seeds. In order to find out the planthopper, floating dust occurrence and decline of the law, do a good job of forecasting and guidance to field control work. In recent years, we made some systematic observations and field surveys. We have summarized the following.