枣园生态系统中主要害虫、天敌种群动态的研究

为了控制枣树害虫,对太谷地区枣园生态系统中主要害虫、天敌的种群动态进行了调查研究。结果表明,⑴在五种不同类型的枣园区发现的昆虫共有209种(包括螨类),它们分别隶属于13个目,80个科;⑵不同的间作管理园,主要害虫、天敌种类组成有明显差异。无杂草园的害虫和天敌的比值是有杂草园的5.66倍;喷过药的枣麦间作园是未喷药的5.73倍;喷过药的枣麦与枣豆间作园的害虫和天敌的比值无明显差异;⑶在不同间作管理园,害虫数量的增减趋势与天敌是一致的,但天敌峰值基本上落后于害虫10~20 d;⑷主要害虫和天敌丰盛度的变化是由于少数极丰盛种类的增减而引起的,在枣树整个生长发育过程中,不同的生育期,害虫和天敌的优势种也有差异。

Studies on Population Dynamics of Natural Enemies and Insect Pests in Jujube Yard Ecosystems

The dynamics of natural enemies and pests population in different intercropped and managed jujube yard ecosystems in Taigu were studied.The results showed that there were 209 species of insects(including harmful mites) in jujube yard ecosystems in Taigu(including 80 families 13 orders).There were obvious different species in important natural enemies and pests among different jujube yard habitats.Natural enemies and pests in jujube yard without weeds were 5.66 time as much as that with weeds,and in jujube yard with insecticide were 5.73 time as much as that without insecticide.But there were no differences in jujube yard of intercropped wheat and soybean.Among different jujube yard habitats,increases and decreases of natural enemies and pests were no differences except that the height of pests were 10d-20d earlier than that of natural enemies.The changes of species richness were caused by a few rich species.During the development of jujube trees,there were different of the dominant species of natural enemies and pests.