论文部分内容阅读
大沙公社处于广东西、北、绥三江下游围田地区,多年来水稻遭受三化螟、稻飞虱、稻纵卷叶螟、粘虫等的严重危害。1973年,中山大学生物系昆虫专业师生在大沙公社进行水稻害虫综合防治试验,1975年全公社综合防治面积扩大到6万亩。1973—1974年两年,三化螟在四造水稻田中有三造为害率都在1%以下,稻纵卷叶螟卷叶率由46.6%下降到2.1—5.5
Dasha commune in western Guangdong, north, Sui Sanjiang downstream Weidian area, over the years suffered rice borer, planthoppers, rice leaf roller, armyworm and other serious harm. In 1973, the Department of Biology, Sun Yat-sen Insect teachers and students in the Dasha commune for pest integrated pest control experiments, comprehensive communes in 1975 the comprehensive prevention and control area expanded to 6 million mu. In the two years between 1973 and 1974, the damage rate of three stem borers in four paddy rice fields was less than 1%, and the leafroll percentage of rice leafroller decreased from 46.6% to 2.1-5.5