2007年昭平县稻飞虱、稻纵卷叶螟发生特点及成灾原因分析

Occurrence and major cause for break-out of rice planthopper and rice leaf folder in Zhaoping County in 2007

稻飞虱和稻纵卷叶螟是昭平县水稻生产上的主要害虫,由于受到异常气候等因素的影响,2007年均达到大发生程度,害虫具有迁入峰期明显,迁入虫量大,发生面积大、范围广,田间虫口密度高,田间虫态结构复杂,为害严重等特点,其原因主要与暴雨频繁、气候适宜、虫源地虫量充裕、成虫迁入数量大、田间残虫基数高、天敌控害能力下降等因素有关。在实际生产中,应加强田间虫情监测,准确掌握最佳防治时期,治前控后,减轻主害代防治压力,科学用药,改进施药方法,以提高施药防治效果。

Rice planthopper and rice leaf folder, the major pests in rice production in Zhaoping County, broke out heavily in 2007 because of abnormal weather. Due to frequent storms, suitable climate, abundant pests resources, large amounts of adult pests migration, high rate of remnants and the decline of natural enemy＇s prevention ability, the pests had the characteristics of obvious migration peak period, a large amount of pests migration, breaking out in a big area and wide range, high population density and complex structure in fields, and causing serious damage etc. In the production, some countermeasures were put forward, which include strengthening field monitoring for pests, mastering the proper period for control, strengthening the prevention and control to reduce the pressure of main pests generation, spraying pesticides scientifically and improving spraying methods to enhance the control effects.