天津地区稻飞虱发生因析及防治措施

The Cause Analysis and The Prevention Measures of Rice Folgorids in Tianjin Arer

天津市1991年8～9月份发生历史上罕见的稻飞虱虫害。全市水稻面积86.5万亩,稻飞虱发生82.41万亩,绝收面积13.06万亩,损夫产量20%。沿海郊区县如塘沽、汉沽、南郊等受害较重。稻飞虱的优势种为褐飞虱。大发生的原因有3个方面:1.南方虫源密度高;2.副热带高气压西伸北抬使稻飞虱提早进入我市;3.天津8月份持续高温给飞虱繁衍造成有利环境。稻飞虱为害与栽植密度,氮素水平,稻田积水,水稻品种有直接关系。我市采取敌敌畏拌毒土方法取得显著防治效果。

Rice fulgorids occurred seriously in August and September 1991 in Tianjin.It was unusual in history.The dominant species community of rice fulgorid was brown fulgorid. Of 865 000 mu rice field,the inroad area was 824 100 mu and no harvest field was 130 600mu. The rate of loss was 20%.The coastal area such as Tan-gn,Han-guu and the south suburbs were more serious.There were thrce aspects for the reason of occurrence:(1)Rice fulgorid popu- lation from south was very large.(2)They came to Tianjin ahead of time because Subtropical high pressure stretched toward the northwest.(3)Continuous high temperture in August caused favourable environment for the insects propagation.The damage of rice fulgorids have direct re- lations to plant density,nitrogen level,accumulated water in field and rice variety.Preven- tion has made obvious effect using toxic soil with DDVP.