烟蚜与其捕食性瓢虫在数量及空间格局间的关系研究

 昆明地区烟田捕食烟蚜的瓢虫主要有异色瓢虫、七星瓢虫和六斑瓢虫3种,其中异色瓢虫占50.3%,七星瓢虫占35.6%,六斑瓢虫占14.1%.烟田烟蚜与瓢虫种群数量消长规律一致,烟蚜与瓢虫数量成明显的正相关（R=0.88^**）;烟株上、中、下3段及上、中株段烟蚜与瓢虫数量成正相关（R_上=0.636^**,R_中=0.596^**,R_下= -0.13）;用Lloyd的平均拥挤度m(*)和平均聚块性指标（m(*)/m)、Iwao的m(*)-m回归分析法分析了烟田及烟株上、中、下３段不同株段烟蚜和瓢虫种群空间分布格局,得到烟蚜与瓢虫在烟田和烟株上、中株段呈聚集分布,证明了瓢虫对烟蚜有明显的追随作用,即烟蚜成聚集分布时３种瓢虫也成聚集分布,借以提高对烟蚜的控制作用。

Relationship of Population Distribution between Myzus persicae and Predatory Ladybugs

The research result shows that there are three predatory Coccinidae species of the Myzus persicae in the tobacco field.The spatial distribution of Coccoinidae belonged to aggregate type and it is consistent with that of Myzus persicae Sulzer. The summit of the population of Coccinidae lag 5 days with that of the Myzus persicae .Vertical distribution of Myzus persicae was extremely correlative with each other in aggregate place,indicating that Coccoinidae has the ability to following Myzus persicae in different tobacco leaves.