美洲斑潜蝇的空间和垂直分布

在不同时期对豇豆相同生育期的美洲斑潜蝇自然种群进行调查．结果表明：在种群密度较小时（＜１头·株－１），空间分布均符合Ｐｏｓｉｏｎ分布，空间分布的图式是随机的；但在种群密度较高时，空间分布均符合二项分布，空间分布图式是聚集的．豇豆上美洲斑潜蝇垂直分布的调查和研究结果表明：美洲斑潜蝇成虫嗜好在嫩叶上产卵；随着作物向上生长和斑潜蝇种群密度的提高，分布逐渐向上扩展．

Spatial pattern and vertical distribution of vegetable leafminer Liriomyza sativae Blanchard (Diptera: Agromyzidae)

The spatial and vertical distribution of vegetable leafminer Liriomyza sativae Blanchard (Diptera: Agromyzidae) was investigated. The results showed that the spatial distribution pattern was a function of population density. When the average population density was less than 1 individual per plant, the spatial distribution of the leafminer conformed to Possion distribution, and the pattern was random, but when density increased, the spatial distribution comformed to the negative binomial distribution, and the pattern of the leafminer was aggregation. The female leafminer had a tendency to lay eggs in tender leaves. As the growth of host plant and increasing of the leafminer population density, the vertical distribution gradually spreaded upward in the plant.