信阳有机茶园主要害虫及其天敌群落结构

近年来信阳茶区不断遭受虫害的困扰，为了有效控制害虫、提高茶叶的品质和产量，2007-2009年对信阳有机茶园的主要害虫和主要天敌种群动态进行了调查。调查方法包括田间实地调查、查阅历史资料和访问茶农。结果显示，有机茶园的主要害虫为茶尺蠖、茶毛虫、假眼小绿叶蝉；主要天敌为蜘蛛类、瓢虫类和寄生蜂类。研究了茶尺蠖、茶毛虫和假眼小绿叶蝉的发生动态，6月份是其发生高峰期。分析了茶毛虫与天敌种群数量的相关性，其关系式为y=0.8159x+3.9514，相关系数为0.7313；假眼小绿叶蝉与天敌种群数量的关系式为y=0.482x+6.0326，相关系数为0.7960；天敌对茶毛虫和假眼小绿叶蝉有较好的控制作用。天敌在5、6月份也有较高的种群数量，在这个时期利用天敌控制害虫是可能的。研究结果对信阳茶园害虫的有效控制具有重要的参考价值。

Community Structure of Major Insect Pests and Their Natural Enemiesin Xinyang’s organic tea orchard

Effective pest control is of great significance to the construction of Xinyang organic tea orchard. By surveying in field, consulting data and visiting farmer, the population status of the main insect pests and natural enemy were investigated in Xinyang organic tea orchard in 2007-2009. The results indicates that the main insects are Ectropis obliqua hypulina Wehrli (Ectropis o.), Euproctis pseudoconspersa Strand (Euproctis p.) and Empoasca vitis Gothe (Empoasca v.), and the main natural enemies are spiders, ladybugs and parasitics. In organic tea garden, between the one of the most important insects Euproctis p. and the populations of natural enemies, the relationship formula is y=0.8159x+3.9514, and coefficient of relevance is 0.7313. While that of the insect Empoasca v. and the populations of natural enemies, the relationship formula is y=0.482x+6.0326, and coefficient of relevance is 0.7960. The natural enemy had some inhibition influences to Euproctis p. and Empoasca v. The appearances of Ectropis o., Euproctis p. and Empoasca v. were in May and June together with their natural enemy in the same period. So, it is possible that to use natural enemy to control the insect pests.