辽宁第二代玉米螟在不同玉米品种上的发生比较及其防治方法探讨

Occurrence of the Second Generation Corn Borer on Different Corn Cultivars in Liaoning Province and its Control Methods Discussion

玉米螟Ostrinia furnacalis是辽宁省玉米的重要害虫,第二代玉米螟危害尤为严重。2006～2007年调查第二代玉米螟对不同玉米品种的危害情况。结果表明,辽单565受害较轻,而辽单526则受害严重。与此同时,对两品种植株与花丝的化学成分进行分析,辽单565的可溶性总糖含量明显低于辽单526,粗纤维高于辽单526,证明辽单526易感第二代玉米螟。利用辽单565密植和辽单526稀植2比空栽培形式进行两品种间作,可降低第二代玉米螟发生量,比未防治区增产538.5 kg/hm2,比清种辽单565增产257.6 kg/hm2。当第二代玉米螟发生达到防治指标时,只需对比空栽培的辽单526的穗部施药即可防止第二代玉米螟的危害,试验结果证明,该方法简单有效且有可操作性。

The Asian corn borer,Ostrinia furnacalis,is one of the most important maize pests in Liaoning province.Especially the second generation has often heavily damaged corn and caused serious economic losses in whole corn production areas.In 2006-2007,the damages on different maize cultivars caused by the second generation of corn borer were surveyed.The results indicated that Liaodan526 suffered more serious losses than Liaodan565.Simultaneously,some chemical components of corn filament and straw were also analy...