不同食料对亚洲玉米螟种群增长的影响

Effect of different food conditions on population increase of Asian corn borer

研究表明，食料对亚洲玉米螟的发育、存活、繁殖和种群增长的影响显著。取食玉米雌穗的幼虫发育快、历期短，取食棉花茎秆的幼虫发育慢、历期长。无论是２代还是３代，均表现为食玉米雌穗的幼虫滞育率高，食棉铃和棉茎的滞育率低。饲以玉米雌穗的种群世代存活率最高，棉铃次之，棉茎最低；以玉米雌穗、棉铃与棉茎为食料的种群趋势指数依次为４２．２８、２５．７７和０．６４。影响第三代玉米螟种群增长的主要虫期是第二代５龄幼虫的滞育或营养不良。

The effect of different foods including the corn ears, cotton bolls and stems on the development, living and reproduction rate of Asian corn borer Ostrinia furnacalis was remarkable. The development of larvae was faster when they fed on the corn ears than the stems of cotton. The diapause rate of larvae on the 2nd and 3rd generations was higher when they fed on the corn than the cotton. The living rate of generation population of O.furnacalis was the highest when larvae fed on the corn ears under three nutrition conditions. The trend index of population (I) was 42.28, 25.77 and 0.64 when the larvae fed on the corn ears, cotton bolls and stems, respectively. The main stage to effect the trend index of population (I) was the diapause or nutrition lack of the 5th instar larva.