春油菜蚜虫的为害及防治指标的研究

蚜虫是造成春油菜减产的重要因素之一,1991～1992年作者研究了春油菜不同生育阶段受蚜虫为害损失及防治指标。结果表明,不同生育阶段的油菜植株受蚜虫为害时,导致株高下降、有效角果数减少、单株产量下降。油菜苗期、苔花期、角果期的临界为害量分别为12～15、50～100、90～100(头/株)。根据虫量与产量损失预测模型,结合春油菜价格、产量水平、防治费用、经济效益及天敌各防治风险等因素,本文提出了每hm~2产1050kg的油菜田,防治指标为12头/株。

ON THE DAMAGE AND ACTION THRESHOLD OF RAPE APHIDS TO VERNAL RAPE

In 1991 - 1992. the damage of rape aphids (a mixture of Lipaphis erysimi (Kaltenbach) ,Myzus persicae Sulzer and Brevicoryne brassicae L. ) in different developmental stages of vernal rape were tested. The critical yield loss thresholds in its seedling.bolting-flowering and podding stages were determined as 12 - 15,50-100 and 90-110 aphids/plant .respectively .and the action threshold at 1050 kg/hm2 of rape production level was proposed as 12 aphids/plant.