甘肃省苹果蠹蛾卵的空间分布格局

为准确掌握苹果蠹蛾Cydia pomonella(L.)的田间发生动态,本文对苹果园中苹果蠹蛾卵的空间分布格局和抽样技术进行了研究。结果表明:在第2代卵发生高峰期,苹果叶片上的苹果蠹蛾卵量显著高于果实上的卵量(叶片上着卵量占总卵量的58.2%,P<0.05),叶片上的卵主要分布于叶片正面(正面着卵量占叶片上总卵量的69.6%,P<0.05);在树冠不同方位上,东、南两面的着卵量最大,但在不同空间层次上分布的卵量没有差异。卵在叶片和果实上均呈聚集分布,且聚集强度随种群密度的升高而增加,其聚集是由环境因素造成的。文中还根据Taylor幂法则参数建立了苹果蠹蛾卵的理论抽样数模型。

The spatial distribution of Cydia pomonella eggs in apple orchards in Gansu Province

In order to accurately determine the population dynamics of the codling moth Cydia pomonella（L.） the spatial distribution of codling moth eggs was investigated in apple orchards in Gansu Province. The results indicate that significantly more 2nd generation eggs were found on leaves than on fruit; leaves had 58.2% of the total amount of eggs. 69.6% of the total number of eggs found on leaves were on their lower surface. More eggs were found in the southern and eastern sectors of apple trees than in the western and northern sectors, but there was no difference in the amounts of the eggs laid at different levels of the trees. Eggs were clumped in space and the degree of clumping increased with population density. The optimal sampling number was calculated by Taylor’s method.