Feeding Behaviors of Wood Destroying Insect Using AE Monitoring

研究结果表明，在白蚁、杉皮蛀虫、粉柱甲虫的取食攻击下，木材的声发射（AE）均被检测到。利用CCD显微摄像机近距离观察了昆虫的口腔运动，结果表明，声发射与昆虫的取食行为活动有明显的相关性。木材声发射的监测为研究木材害虫的行为提供了重要的信息，对地下白蚁的研究结果表明：（1）声发射发生率随白蚁数量的增加而增加; (2)AE事件在设置小尺寸样本后约几小时开始产生，并突然增加，然而，在此之后，它们在测试开始后约几天降低到恒定的产生率。(3)即使有相同数量的工人居住，AE产生率较高的标本与士兵比没有士兵。(4)AE事件随着环境温度从27 ℃的标准度下降或上升而减少。(5)声发射的产生随光照的变化而变化，表明取食活动受光照的影响，声发射监测方法有望为研究食木性昆虫的行为提供参考数据，从而建立与环境相适应的食木性昆虫防治体系。

It was revealed from this study that acoustic emissions (AEs) were detected from the wood specimens under feeding attack by sugi bark borers or powder-post beetles as well as termites. The close-up observations of the oral movement using CCD micro-camera have clarified that the AEs were evidently relevant with the activities of feeding behaviors of the insects. The monitoring of AEs from the wood specimens gave much interesting information for the investigation of the behaviors of wood destroying insects.Results obtained from the study on subterranean termites were as follows ; (1) The rate of AE events increased proportionally to the number of the inhabiting workers. (2) The AE events began to generate about a few hours after setting the small size specimens and increased suddenly, however, after then they decreased to a constant generating rate about a few days after starting of tests. (3) Even with the same number of inhabiting workers, AEs were generated at higher rate from the specimen with soldiers than without soldiers. (4) AE events decreased as the ambient temperature fell or rose from the standard degree of 27ﾟC.(5) The generation of AE have changed according to the effect of lighting suggesting the activities of feeding were influenced by irradiation of light.The AE monitoring method should promise to provide a suggestive data for the investigation of behaviors of wood-feeding insects in order to develop their control system which is compatible with environment.