为了探索防治大麦蚜虫的科学有效措施,选用保山市大面积推广的二棱品种"保啤麦28号",每10 kg种子分别用20、30、40 g 70％噻虫嗪种子处理可分散粉剂拌种防治蚜虫.结果表明:不同用量的70％噻虫嗪种子处理可分散粉剂拌种能有效抑制蚜虫对大麦的危害.大麦拔节期前,防效均达100％;大麦孕穗期至抽穗扬花期,防效为72.30％～95.70％;大麦灌浆期,防效为33.60％～80.04％;大麦乳熟期,防效为14.20％～49.44％,防效随着用量的增加而增加,且持效期更长;每10 kg种子用药30、40 g防效最佳,与每10 kg种子用30 mL的30％噻虫嗪悬浮种衣剂拌种防效相近.药剂拌种对大麦还具有增产作用,增产率为8.6％～16.9％.建议在大麦生产中,根据当地蚜虫发生规律选择不同用量、不同剂型的杀虫剂拌种防治大麦蚜虫,综合考虑防效、成本和用量,达到节本、增效的目的.
The control effect and yield increasing effect of thiamethoxam 70％WS on barley aphids
The seeds were treated with thiamethoxam 70％WS 20,30,40 g per 10 kg seeds to control aphids.The results showed that seed dressing with different concentrations of thiamethoxam 70％WS could effectively inhibit the harm of aphids to barley.Before the jointing stage of barley,the control effects were all 100％.From booting stage to heading and flowering stage,the control effects were 72.30％-95.70％.At the filling stage of barley,the control effects were 33.60％-80.04％.At the milk ripening stage of barley,the control effects were 14.20％-49.44％,and the control effect increased with the increase of concentration and lasted for a long time.The control effects of 30 and 40 g per 10 kg seeds were similar to that of thiamethoxam 30％FS 30 mL per 10 kg seeds.Seed dressing could also increase the yield of barley by 8.6％-16.9％.In order to achieve the purpose of saving cost and increasing efficiency,in barley production,different concentrations and different formulations of insecticides should be selected to control barley aphids according to the occurrence regularity of local aphids,and the control effect,cost and dosage.
万方数据
维普
