新疆枣园害螨和天敌种类调查及其发生动态研究

为明确新疆枣园害螨和天敌种类及其二者的种群发生动态，于2013年6月至8月份对新疆主要枣产区6个地州25个县市51样点的害螨和天敌种类进行了系统调查，并于5月至9月份对不同间作模式下截形叶螨及其天敌种群消长动态进行了监测.结果表明，目前新疆枣园中主要害螨种类有截形叶螨（Tetranychus truncatus Ehara）、敦煌叶螨（Tetranychus dunhuangensis Wang）和Tetranychus sp．3种，均属叶螨科、叶螨属，其中截形叶螨为优势种；天敌主要包括深点食螨瓢虫（Stethorus punctillum Weise）、菱斑巧瓢虫（Oenopia conglobata Linnae-us）、塔六点蓟马（Scolothrips takahashii Priesner）及中华草蛉（Chrysopa sinica Tjeder），但天敌优势种在不同间作模式下有所差异.害螨及其天敌发生动态监测结果显示，天敌对截形叶螨在发生时间与种群数量上均表现出明显的跟随现象，阿克苏市的截形叶螨在两种不同栽培模式下分别于8月上旬和中旬达到最高峰，其天敌高峰期滞后害螨数量高峰约1周左右（5~7d）.

A Preliminary Report on Pest Mites and Their Natural Enemies in Xinj iang Juj ube Orchards

In order to clarify the species of pest mites and their natural enemies in Xinjiang jujube or-chards,51 sampling points in the main jujube production regions of Xinjiang including 25 counties and cities from June to August,2013 were investigated.The results showed that there are main 3 species of pest mites,Tetranychus truncatus Ehara,Tetranychus dunhuangensis Wang and Tetranychus sp.in Xinjiang j uj ube orchards at present,among which Tetranychus truncates Ehara is the dominant species.And their natural enemies mainly include Stethorus punctillum Weise,Oenopia conglobata Linnaeus,Scolotgrips takahashii Priesner and Chrysoperla sinica Tj eder,but the dominant natural enemies are different under different cropping planting patterns.In addition,the population dynamics of Tetranychus truncatus Ehara and its natural enemies were monitored in the Aksu region of Xinj iang.The fixed points and fixed plants in two different kinds of j uj ube-crop intercropping fields were investigated and analyzed.The result showed that the population trend of Tetranychus truncatus Ehara was the same as that of its natural enemies in both kinds of j uj ube-crop intercropping fields.An increase number of natural enemies occurred when the population ofTetranychus truncatus Ehara reached a peak about a week later in the first ten-day period and in the middle ten-day of August.