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我们应用振动机,对高大树上马尾松毛虫幼虫数量和虫龄及其分布进行了调查研究。试验松树高5.0—10.2m,胸径15—25cm。振动机安装在离地1m处的树干上,开机振动5次(每次振动30s,振动间隔5—10min),可将高大树上的幼虫振落坠地,平均振落率达85.4％,最高可达94.8％。尤其晴天中午,幼虫在取食针叶时最易振落、效果最佳。以振落率为参数可准确推算高大树上的幼虫数量。应用振动机调查高大树上害虫数量,可就地作业、随即统计,具有简捷直观、准确可靠等优点。可在生产实践中广泛推广应用。
We applied vibrating machine to investigate the population, worm age and their distribution of Dendrolimus punctatus in tall trees. Pine trial high 5.0-10.2m, diameter 15-25cm. The vibrating machine is installed on the trunk at 1m above the ground and the vibrating power is switched on for 5 times (30s for each vibration and 5-10min for vibration interval), and the larvae on the tall tree can fall to the ground with an average vibration rate of 85.4% Up to 94.8%. Especially sunny noon, larvae most likely to shake off when feeding on needles, the best. Using the rate of oscillation as a parameter, the number of larvae in tall trees can be accurately estimated. Vibrator investigation of tall trees on the number of pests, can be local operations, then statistics, with a simple and intuitive, accurate and reliable. Can be widely promoted in production practice.