亚洲玉米螟蛀孔和越冬幼虫在玉米上的空间分布

Spatial Distribution of Holes and Overwintering Larvae of the Asian Corn Borer in Corn Stalk

在黑龙江齐齐哈尔,亚洲玉米螟一代幼虫蛀孔主要分布在玉米茎秆的中部,占总蛀孔数的69.6%;二代幼虫蛀孔主要分布在茎秆下部,占总蛀孔数的41.2%。越冬幼虫在玉米茎秆的中部和下部均有较多分布,分别占总活虫数的40.6%和36.6%。在吉林公主岭,玉米螟一、二代幼虫蛀孔主要分布在茎秆的中部,分别占总蛀孔数的47.3%和47.7%;越冬幼虫分布位置主要在茎秆下部,占总幼虫数的63.2%,在12月入冬后,茎秆下部的幼虫占总数的比率有所上升,达69.2%,次年化蛹前根茬中活虫数占比达24.3%。研究结果表明,北方春玉米二代玉米螟幼虫蛀孔在茎秆中的分布比一代蛀孔分布位置靠下,越冬幼虫主要分布在茎秆的中部和下部,且有下移趋势。

The holes of 1st generation was mainly distributed in the middle portion of the corn stalks for 69.6%,the 2nd generation mainly in the lower portion for 41.2%,the distribution of overwintering larvae of the Asian corn borer were mainly distributed in the middle portion and the lower portion for 40.6%and 36.6%in Qiqihar,respec⁃tively.The distribution of holes of 1st and 2nd generation was mainly in the middle portion of the stalk for 47.3%and 47.7%,the overwintering larvae was mainly distributed in the lower portion for 63.2%at harvest,and in the low⁃er portion increased to 69.2%in December of 2018,in the root portion increased to 24.3%in April of 2019,respec⁃tively.The results showed that the distribution of holes caused by Asian corn borer in the 2nd generation was lower than that of holes in the 1st generation,the overwintering larvae of Asian corn borer mainly distributed in the middle and lower portion of the stalk and had a downward trend.