辽宁棚室西甜瓜蚜虫种群动态与药剂试验

为掌握瓜蚜的发生动态,完善农药减施技术,对辽宁省西甜瓜棚开展监测、调查与药剂试验。利用黄板监测棚内瓜蚜的发生动态,同时对棚内瓜蚜展开系统调查,并检验混配药剂的防控效果。结果表明,北镇市大屯乡‘脆宝’甜瓜蚜虫有翅蚜高峰在3月上旬,蚜量高峰在2月底;营口市熊岳镇‘甜王’西瓜蚜虫有翅蚜高峰在5月中旬,蚜量高峰在5月上旬;凤城市大堡蒙古族乡‘甜王’西瓜蚜虫有翅蚜高峰在5月下旬,蚜量高峰在5月中旬。新高脂膜剂可显著提升25%噻虫嗪水分散粒剂对瓜蚜的防效,药后14天防效达97.0%。棚室‘脆宝’甜瓜和‘甜王’西瓜蚜虫的防控关键期可分别在2月下旬和5月中上旬进行,防控效果好,省时省力。

Report on Population Dynamics of Aphis gossypii and Pesticide Efficacy Trial in Watermelon and Muskmelon Greenhouses in Liaoning

To understand the occurrence dynamics of Aphis gossypii, and improve a pesticide-reduction technology against aphids, we carried out monitoring, investigation and trials in the watermelon and muskmelon greenhouses of Liaoning Province. Yellow sticky boards were applied to monitor the occurrence dynamics of A. gossypii in the greenhouses, and systematic investigations and pesticide efficacy trials with two reagents mixed were implemented. The results showed that the peak of winged aphids occurred in early-March in muskmelon cultivar ‘Cuibao’ greenhouses of Datun town, Beizhen City, and the peak of total aphids was in the end of February; the winged aphids reached peak in mid-May in watermelon cultivar ‘Tianwang’ greenhouses of Xiongyue town, Yingkou City, and the peak of total aphids was in early-May; the peak of winged aphids occurred in late-May in watermelon cultivar ‘Tianwang’ greenhouses of Dapu Mongolian town, Fengcheng City, and the peak of total aphids was in mid-May. Compared with the control, the new type high-fat membrane powder could significantly improve the control effect of 25% thiamethoxam water dispersible granule (WG) against A. gossypii, and the control effect after 14 days’ treatment could reach 97.0%. The critical period for the control and prevention of A. gossypii in muskmelon cultivar ‘Cuibao’ greenhouses and watermelon cultivar ‘Tianwang’ greenhouses is late-February and early and mid-May respectively, which could achieve good efficacy and have low cost.