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今年入夏以来,南方暴雨频繁,锋面天气多,6月下旬稻纵卷叶螟、稻飞虱开始大量迁入南方的湖南等稻区,进入虫量较多,发生数量高于上年同期,预示着南方水稻“南迁”害虫大发生的可能性大。目前田间大量发生的是稻纵卷叶螟、稻飞虱,其发生时间相对比较偏早,进入7月、8月以后,晚稻大田这两种外迁害虫几乎年年都是大发生。也就是说晚稻上部遭受稻纵卷叶螟的危害,下部则被褐稻虱栖息吸食危害,晚稻生产面临最严重的威胁,防治失策晚稻将有大面积死秆倒禾的危险。
Since the beginning of summer this year, the southern rainstorms are frequent and the frontal weather is more. In late June, the rice leaf roller and planthopper started to migrate in large quantities to Hunan and other rice areas in the south, with more pests and more occurrences than the same period of last year. This indicates that there is a high possibility of occurrence of pests in the southern rice “southward move”. At present, a large number of rice leaf roller and rice planthopper occur in the field, and its occurrence time is relatively early. After entering July and August, these two pest outbreaks occurred in late rice cropping field almost every year. In other words, the upper part of late rice is endangered by the rice leaf roller, and the lower part is endangered by the brown rice louse inhalation. The late rice production faces the most serious threat, and the late rice will have the danger of large-scale death.