茶尺蠖性信息素的田间使用技术及防治效果

为明确茶尺蠖Ectropis obliqua性信息素的田间使用技术,在田间设置茶尺蠖性信息素诱捕器的5、10和20 m挂放密度处理区及其对照区,并对不同处理区和对照区中诱捕器诱集的茶尺蠖成虫和幼虫数量以及同一挂放密度下距性信息素诱捕器不同距离的茶尺蠖幼虫数量进行调查,确定性信息素诱捕器的最佳挂放间距;在此基础上确定性信息素诱捕器对茶尺蠖的田间防治效果,并利用性信息素诱捕器对茶尺蠖成虫的田间动态进行监测。结果表明:在任何一个挂放密度下,处理区诱捕器诱集的茶尺蠖成虫数量均显著高于对照区诱捕器,但在不同挂放密度的小区之间单个诱捕器诱集的成虫数量差异不显著;当茶尺蠖幼虫重度发生(1 361.57头/m~2)时,10 m间隔挂放1套性信息素诱捕器可显著降低茶尺蠖幼虫的发生数量;当茶尺蠖幼虫轻度发生(38.40头/m~2)时,间距为20 m挂放一套性信息素诱捕器时,茶尺蠖的校正防治效果可达88.44%;茶尺蠖性信息素诱捕器在6月上旬、8月上旬、8月下旬至9月初、9月下旬分别有一个明显的诱捕高峰期,与田间茶尺蠖的发生高峰期基本一致。表明茶尺蠖性信息素诱捕器可作为大量诱捕和虫情监测的手段在茶园中应用。

Field application technique and control efficiency of Ectropis obliqua sex pheromone

To evaluate the field application technique of Ectropis obliqua sex pheromone, traps baited with/without lures under five, ten and 20 m gradient densities were arranged and the number of moths and larvae in the treatment and control areas were investigated, and the number of larvae at the same density trapped at different locations was also investigated. Then the optimum spacing and the field efficiency of the pheromone traps were measured, and the entrapment of E. obliqua adults in the field by using sex pheromone traps was monitored. The results showed that the number of E. obliqua adults trapped was significantly higher than that of the control at all tested densities, but there was no significant difference in the numbers of E. obliqua adults captured by single traps at different densities; traps placed at intervals of ten meter significantly reduced the quantity of E. obliqua larvae when the larvae severely occurred (1 361.57 individuals per square meter); the control efficiency of traps placed at intervals of 20 m was 88.44% when E. obliqua mildly occurred (38.40 individuals per square meter). Furthermore, there were four trapping peaks during the full year investigation (early June, early August,late August to early September and late September), which was basically coincident with the peak periods of E. obliqua occurrence. The results indicated that traps baited with E. obliqua sex pheromone lures could be used as mass trapping and for moth occurrence monitoring in the tea plantation.