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小麦收获期对麦套棉田捕食性天敌和棉花苗蚜的影响

DOI: 10.3321/j.issn:1000-7091.2007.02.038, PP. 156-160

Keywords: 麦棉套种,捕食性天敌,麦蚜,棉蚜,小麦收获期

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Abstract:

2004-2005年在冀南棉区研究了小麦收获期对麦套棉田中捕食性天敌和棉花苗蚜的影响。小麦收获期共设3个水平,分别是6月5日、6月10日和6月15日收获小麦。结果表明:2004年3个时期收获小麦对棉田的益害比(天敌和棉蚜的比值)无显著影响(t>0.05);2005年6月5日收获小麦,显著增加了棉田的益害比(t<0.05),6月10日和6月15日收获小麦对棉田的益害比无显著影响(t>0.05)。说明在麦套棉田中,麦田天敌到棉田的有效转移受麦蚜-天敌-棉蚜三者发生高峰期的影响,不同年份天敌的转移情况有所不同。麦蚜发生高峰期早则小麦天敌向棉田转移早,并能有效控制苗期蚜虫的危害,在麦熟期收获小麦,对棉田天敌的数量影响不大;反之,若麦蚜发生高峰期晚,麦田天敌发生期也会相应延后,在麦熟期收获小麦则会引起棉田天敌的增加。因此,棉田天敌数量变化受小麦收获期的影响,但与麦蚜和麦田天敌的发生动态有直接关系。

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