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紫云英留种田要到5月中、下旬才能收获,这样使它成为越冬三化螟、二化螟、叶蝉、地老虎、蓟马等害虫的有效虫源田,这种虫源田是造成水稻病虫灾害的基础之一。因此,消灭紫云英留种田里的害虫,是贯彻“预防为主,综合防治”植保方针的一项重要措施。从1965年开始,我区广大群众就利用春雨或放水堵缺,于紫云英盛花末期,实行短期灌水灭虫,取得了较好的防治效果。灌水灭虫的面积逐年扩大,到1978年已扩大
It is not until the mid-to late May harvest that the Chinese milk vetch leaves the field that it will become an effective insect source field for the overwintering Borer, Chilo suppressalis, Leafhopper, Landrace, Thrips and other pests. One of the foundations of pests and diseases. Therefore, eliminating the insects that are left in the fields of the milk vetch is an important measure to carry out the policy of “prevention first and comprehensive prevention and cure”. Since 1965, the majority of people in our district have used the spring rain or blocked water to drain water. In the end of the flowering period of Ziyunying, short-term irrigation and pest control have been implemented and a good control effect has been achieved. The area of irrigation and pest control has been expanding year by year and has been expanded by 1978