苹果园越冬代和第一代顶梢卷叶蛾的空间分布

THE SPATIAL DISTRIBUTION OF THE OVERWINTERING AND FIRST GENERATION OF SPILONOTA LECHRIASPIS IN APPLE ORCHARD

１９９３年５～６月，在山东高密进行的苹果园顶梢卷叶蛾空间分布研究表明：越冬代的幼虫、蛹、虫苞及总虫数在田间的空间分布，均呈聚集型分布。最适合用最大或然估值法求ｋ计算出的负二项分布，不符合Ｐｏｉｓｓｏｎ分布。其在苹果树上的数量分布，东西南北各方位之间，差异不显著，内外层之间，则达极显著水平，外层多于内层。第一代，同时符合Ｎｅｙｍａｎ分布中ｎ＝２，３，ｎ→∞和２种方法拟合的负二项分布，以负二项分布拟合度最高。释放松毛虫赤眼蜂后，第一代的分布型则既符合负二项分布。

During the period from May to June, 1993, the studies on spatial distribution on Spilonota lechriaspis larva, pupa et al. were conducted in apple orchard, Gaomi, Shandong. It was shown that the pattern of spatial distribution of Spilonota lechriaspis is aggregative distribution. In overwintering generation, it approachs the negative biomial distribution pattern and is in consistent with the piosson. The diference of its quantity distribution on the apple tree in different direction is not significant, but significant between internal and external. For the first generation, it is consistent with Neyman (n=2,3,n→∞) and negative biomial distribution pattern. After releasing Trichogramma dendrolimi, the spatial distribution pattern of Spilonota lechriaspis in the first generation was consistent with the negative biomial and piosson.