近年来,玉米螟危害逐年加重,已成为夺取玉米高产稳产的一个重要因素,为了准确测报,适时组织防治,有效地控制其危害,我们对玉米螟蛹的形态特征和各级所需天数作了系统观察,现将在24℃左右的情况下所观察结果描述如下,仅供参考。一级蛹:复眼乳白到浅红色,眼点明显,本级需1.5—2天,到羽化需7—9天。二级蛹:复眼红色到深红色,眼点消失, In recent years, the harm of corn borer has increased year by year, which has become an important factor to seize the high and stable yield of corn. In order to accurately measure the report, timely organize the prevention and control and effectively control its harm, we made the morphological characteristics and days required for all stages of the corn borer Systematic observation, the result that will look around at 24 ℃ now is described below, just for reference. A pupa: Compound eye creamy to light red, clear eye, the need to be 1.5-2 days, to emergence need 7-9 days. Secondary pupae: compound eye red to dark red, eyes disappear,