甘蔗生长中后期稻蛀茎夜蛾蛀孔垂直分布及抽样技术研究

Vertical distribution and sampling technique of borer holes caused by Sesamiainferens in the middle and later growth periods of sugarcane

2013年-2015年我们调查了甘蔗生长中后期稻蛀茎夜蛾为害形成的蛀孔,应用统计学方法对蛀孔在蔗茎上的垂直分布特征进行研究。结果表明,蛀孔在蔗茎上的垂直分布呈现单峰型分布特征,分布于蔗茎14节以下。蛀孔基本成分为个体群,个体间相互吸引,在蔗茎上呈聚集分布。应用Iwao的理论抽样数模型,计算出一定允许误差和一定种群密度下的理论抽样数。

From 2013 to 2015,we surveyed the borer holes caused by Sesamia inferens in the middle and later growth periods of sugarcane,and analyzed vertical distribution characteristics of borer holes in cane stalk by statistical methods.The results showed that holes in cane stalk presented single peak with vertical distribution characteristics,distributing in 1st-14th of cane stalk.Holes in cane stalk had an aggregated distribution pattern,and the basic element of vertical distribution was an individual colony in cane stalk.Individuals attracted each other and the holes were of aggregated distribution.Using Iwao’s regression,we derived theoretical sampling formula with the permissible error and the population density.