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白背飞虱系迁飞性昆虫,是鄱阳湖区水稻主要害虫之一。二晚大田的虫源,除主要来自当地早稻收割后转移的外,还有南方稻区7月底迁入的长翅型成虫,增大了虫源基数,只要8月份气候条件适宜,二晚就会受害严重,近年来,该虫已上升为二晚的头号害虫,是防治的主攻对象。 白背飞虱种群变动的因素 鄱阳湖稻区的白背飞虱不能在当地越冬,初次虫源系由外省随西南气流迁入降落构成,其种群数量变动受到下列因子的影响。
White-backed planthopper migratory insects, is one of the main rice pests in Poyang Lake. In addition to mainly from the local early rice after the transfer of the transfer, there are long-winged adults migrating into the southern rice area by the end of July, increasing the base number of insects, as long as the weather conditions in August suitable, two nights In recent years, the insect has risen to number two pests for two nights, is the main target of prevention and treatment. White-backed planthopper population change The white -backed planthopper in the Poyang Lake rice area can not overwinter in the local area. The primary insect source is migrated into and descended from the southwest airflow by other provinces. The change of population size is affected by the following factors.