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稻纵卷叶螟在我县原属局部地区间歇猖獗的害虫。随着耕作制度的改革,作物品种的更换,施肥水平和栽插密度的提高,造成了有利于稻纵卷叶螟发生的条件。自1972年起,我县稻纵卷叶螟出现了为害逐年加重的趋势,成为我县历年常发主要害虫之一。 据本站多年的调查观察,稻纵卷叶螟在我县一年发生五个世代。明显为害水稻生长的有四个世代,其中以二、四两个世代为害最烈。
Rice leafroller in my county was originally a local area rampant pests. With the reform of the tillage system, the replacement of crop varieties, fertilization levels and planting density, resulting in conditions conducive to the occurrence of rice leaf roller. Since 1972, there has been a trend of harm to rice leafroller in our county, which has become one of the major pests in our county over the years. According to the station for many years of investigation and observation, rice leafroller occurred in our county five generations a year. Obvious damage to rice growth has four generations, of which two or four generations of the two most damaging.