玉米螟一代卵块在春玉米田垂直分布规律的探讨

本文对玉米螟一代卵块在春玉米田垂直分布规律进行了探讨,并为制定其合理的田间抽样方法提供了进一步的依据。 一代螟卵块在春玉米田中的垂直分布同水平分布一样,也基本属于聚集分布(主要为嵌纹分布,适合于负二项概率分布型),分布的基本成分为卵块群(个体群)。在整个一代螟卵期内,卵块主要聚集 分布于玉米心叶下展开叶的第一至第五叶片层上(占总卵块数的96.6％±2.5％),尤其分布于第二至第四叶片层上(占78.6％±3.7％)。并且这一分配规律不受观测时间和玉米植株生长发育的影响,适合于以下的二次趋势面方程: P_(ht)=0.21500+0.02090h-0.00779h~2 本文提供了第二至第四3片展开叶上卵块量的区间估计值(76.89％,80.31％)(95％置信度)。并 建议在春玉米田调查一代螟卵块量时,只需检查此3片叶上的卵块数,便可以根据上述估计值,进一步推算出全田总卵块量的范围。这样可以节省2/3左右的田间调查工作量。

A PRELIMINARY STUDY ON THE VERTICAL DISTRIBUTIONOF THE FIRST GENERATION EGG MASSES OF ASIANCORN BORER IN SPRING CORN FIELDS

The paper deals with the vertical distribution of the first generation egg ma- sses of Asian corn borer, Ostrinia furnacalis (Guenee), in the spring corn fields.The vertical distribution of the first generation egg masses in the spring corn fields fundamentally belongs to an aggregated distribution pattern (mainly mosaic distribution pattern) just as the horizontal distribution. The first generation egg masses of the corn borers are distributed mainly over the range between the 1st leaf and the 5th leaf ben...