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近年来,小麦切根虫Euxoa tritici(L.)在豫西山区栾川县境内经常发生为害小麦、油菜和多种春播作物,特别是春红薯与玉米受害最重。为摸清该虫的发生规律,自1976年开始连续进行了八年的观察。此虫属偶发性的害虫,一年一代,以幼虫越冬。当成虫在11月中、下旬产卵后,幼虫卵孵化为害,并有较强的抗寒与耐饥能力。据室内观察,0℃时停止活动,升温至6℃时又恢复活动。在3℃时不吃食料可存活13
In recent years, Euxoa tritici (L.) of wheat rootworm is frequently harmed wheat, canola and many other spring crops in Luanchuan County, western mountainous area of Henan Province. Especially, sweet potato and maize suffer the most. In order to find out the law of occurrence of the pest, we have conducted eight consecutive observations since 1976. This insect is a sporadic pest, a year old, with larvae overwintering. When adults in mid-November, late spawning larvae eggs hatch damage, and have a strong cold and hunger capacity. According to indoor observation, stop activities at 0 ℃, heating to 6 ℃ and then resume activity. At 3 ℃ do not eat food can survive 13