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A medium for mass culturing of a bamboo boring beetle Dinoderus minutus Fabricius
1983 - IRG/WP 1182
The bamboo is a traditional product of Japan. But its susceptibility to insects is one of the most important problems. The author has found that for the determination of the effectiveness of insecticides it is very easy to obtain sufficiently numerous adults of Dinoderus minutus by using Buckwheat Cake. The Buckwheat Cake is prepared with buckwheat flour and thin paper. The author has previously found that Buckwheat Cake is suitable for the culturing of Lyctus brunneus and these results were presented in 1981. In culturing Dinoderus minutus, Buckwheat Cake has been found to be also easier and fasting in bringing forth the adults than natural bamboo.
K Suzuki


The preventive actions of three commercial wood preservatives against Dinoderus minutus
1984 - IRG/WP 1233
Dinoderus minutus is one of the most common pest insects for the bamboos. For preventing the damages of this insect, the preventive treatment of bamboos with preservatives is necessary. But because of the environmental reasons, only limited insecticides are available in Japan. The author determined the preventive effects of three commercial products against Dinoderus minutus by the medium of the Buckwheat Cake and also by a bamboo (Phyllostachys bambusolides). The results obtained were severer than ones of Lyctus brunneus. In the case of dipping treatment of the bamboo, Fenitrothion is more effective than two other preservatives (Chlordane and Phoxim).
K Suzuki


Observation of Boring Process of Larvae of the Bamboo Powder-post Beetle (Dinoderus minutus)
2014 - IRG/WP 14-10821
The bamboo powder-post beetle Dinoderus minutus is a major pest of felled bamboo in Japan. X-ray computer tomography (CT) was applied to non-destructively trace the movement of the larvae of this beetle inside the infested bamboo samples. The bamboo samples were prepared from pieces of the Japanese timber bamboo Phyllostachys bambusoides culms that were enclosed with adult D. minutus beetles for approximately two months. The samples were then scanned using the microfocus X-ray CT system every 2 to 5 days. In the CT images, with the voxel size of 61.9 μm, the figures of the larvae and other stages of the beetles were clearly visible and they were distinguished from bamboo, insect tunnels, and frass. It was also possible to trace the movement of larvae, mostly along the fibers, by comparing CT images of different dates. The CT images then were used to evaluate the amount of bamboo bored by a larva. The larva was traced until pupation and the time courses of tunnel length and volume were obtained by measuring the changes in the length and volume of the tunnel in pixels.
H Watanabe, Y Yanase, Y Fujii


Nondestructive analysis of oviposition of the bamboo powderpost beetle Dinoderus minutus using acoustic emission and X-ray CT
2017 - IRG/WP 17-10889
The bamboo powderpost beetle Dinoderus minutus is a major pest of dry bamboo culms in Japan. In this study, acoustic emission (AE) and X-ray computed tomography (CT) was applied to the nondestructive analysis of the ovipositional behavior of adult D. minutus beetles inside bamboo pieces. Newly mated adult females were individually exposed to oviposition bamboo pieces prepared from culms of Phyllostachys bambusoides. AE measurement of the bamboo pieces were conducted continuously using AE sensors with a resonant frequency of 150 kHz. The bamboo pieces were scanned by the microfocus X-ray CT system with intervals of 2–5 d to observe the oviposition tunnels and eggs inside. Time courses of hourly AE hit rate showed that the female adults immediately started tunneling, and the tunneling activity continued almost ceaselessly. Oviposition tunnels bored across vascular bundles of bamboo and eggs deposited in the vessels were captured in X-ray CT images, and the length of oviposition tunnels and the number of eggs were measured.
H Watanabe, Y Yanase, Y Fujii