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二点委夜蛾[Proxenus lepigone(M schler)]是中国玉米在2005年新发害虫,2011年暴发,发生范围扩大到6个夏玉米主产省,目前还没有针对性的防治措施及药剂。为了寻求防治二点委夜蛾的有效防控措施和理想的农药品种,采用9种药剂11个处理和毒土、毒饵两种施药方法进行田间试验,对用药前后被害株率进行测定。结果表明,辛硫磷、敌敌畏、毒死蜱、氯虫苯甲酰胺、敌百虫、高效氟氯氰菊酯6种药剂的毒土和毒饵法,对二点委夜蛾幼虫都有较好的防治效果,毒饵法对二点委夜蛾幼虫诱杀效果更为明显。同时还对这些药剂及施药方法在玉米苗期的安全性进行了评定,用毒死蜱防治后,7天内使用烟嘧磺隆类除草剂,玉米新叶会出现药害。
Proxenus lepigone (M schler) is a new pest of Chinese maize in 2005 and its outbreak in 2011 has widened to 6 major maize producing provinces. There are no specific prevention and treatment measures and medicaments. In order to find out the effective control measures and the ideal pesticide varieties for the control of the 2nd instar litura, 11 treatments of 9 kinds of pesticides and two methods of poison soil and poison bait were applied in the field experiments to determine the rate of the victim plants before and after treatment. The results showed that the toxic soil and bait method of phoxim, dichlorvos, chlorpyrifos, chlorantraniliprole, trichlorfon and cyhalothrin were effective in controlling larvae of Spodoptera exigua. Law on the second instar louse moth larvae trapping effect is more obvious. At the same time, the safety of these pesticides and their application methods in maize seedling were also evaluated. After controlling with chlorpyrifos, nicosulfuron herbicide was applied within 7 days, and the new leaf of maize would appear phytotoxicity.