稠李巢蛾丝巢和幼虫空间分布型的研究

Research on spatial distribution patterns of nest and larvae of Yponomeuta evonymallus

稠李巢蛾是一种重要的食叶害虫,主要危害稠李、苹果、卫矛、樱桃等植物。Cassie指标、扩散系数、丛生指数和M*/M的计算结果表明:稠李巢蛾丝巢和幼虫的空间分布格局为聚集分布,聚集的基本单位为个体群;丝巢在树冠上的分布格局为聚集分布型,幼虫在丝巢中的分布格局为聚集分布型,聚集的程度不高,并有向随机分布变化的趋势。

The Yponomeuta evonymaUus was an major leaf pest for Pnmus , Malus , Euonymus and Cerasus. The Cassie index, expanding coefficient, clnster index and M ＊/M results showed that the spatial distribution pattern of nest and larvae of Yponomeuta evonymallus were aggregated. The individual population was the basic unit. The distribution of nest in canopy was aggregated, and the distribution of laverae in the nest was aggregated too. However, the aggregated degree was not high, tending to random distribution.