15.8%精喹禾灵EC对春油菜田旱雀麦、野燕麦的防治效果

为明确15.8%精喹禾灵EC对春油菜田禾本科杂草的防除效果及其使用的安全性,在田间设15.8%精喹禾灵EC每公顷225、300、375、600 mL4个剂量处理,以15%精喹禾灵EC300 mL/hm2为对照药剂,以人工锄草和清水喷雾为对照,于油菜2～5叶期(旱雀麦1～4叶期、野燕麦2～4叶期)对水300 L喷雾处理,药后观察油菜和杂草的反应,20d、40d时调查杂草防效。试验结果表明,15.8%精喹禾灵EC对油菜田旱雀麦、野燕麦具有很好的防效,适宜剂量分别为375 mL/hm2、300 mL/hm2,此时防效均在80%以上,并且对油菜安全。因此,15.8%精喹禾灵EC是防除油菜田旱雀麦和野燕麦的优良除草剂,可以在生产上推广使用。

Control Efficacy of Quizalofop-P-ethyl 15.8% EC against Bromus tectorum L.and Arena fatua L.in Spring Rape Fields

The study revealed the control efficacy of Quizalofop-P-ethyl 15.8% EC against Bromus tectorumL.and Avena fatua L.as well as its safety in spring rape fields.The treatment included 225,300,375 and 600 mL/ha of Quizalofop-P-ethyl 15.8% EC.The 300 mL/ha of Quizalofop-P-ethyl 15% EC was used as herbicide control,and manual weeding and water were regarded as negative control.These herbicides were sprayed during 2-5 leaf stage of rape with 300 L water(1-4 leaf stage of Bromus tectorum L.and 2-4 leaf stage of Avena fatua L.).The incidence of weeds was investigated on the 20 th and 40 th days after the first spraying for calculating the control effects.The results of field trial showed that Quizalofop-P-ethyl 15.8% EC preformed well in controlling the weeds of Bromus tectorum L.and Avena fatua L.and the suitable dosages were 375 mL/ha and 300 mL/ha,respectively.Quizalofop-P-ethyl 15.8% EC effectively controlled Bromus tectorum L.and Avena fatua L.and could be used widely in spring rape fields.