Changes in the distributions of pine wilt disease and the vector beetle Monochamus alternatus in the Tohoku region of northern Japan
2008
To clarify the spread of pine wilt disease to undamaged parts of the Tohoku region of northern Japan, researchers surveyed the distributions of dead Pinus thunbergii and P. densiflora trees killed by the pinewood nematode Bursaphelenchus xylophilus and the vector beetle Monochamus alternatus. The surveys were conducted every year between 1980 and 2006 in 6 prefectures of the Tohoku region-Fukushima, Miyagi, Yamagata, Iwate, Akita, and Aomori. These data were combined to yield the annual figures for the Tohoku region. The distributions of both pine wilt disease and M. alternatus had extended to the undamaged regions during the surveyed period. The disease extended to the northern parts of Akita prefecture bordering the Sea of Japan and to the middle of Iwate prefecture on the Pacific shore, while the distribution of M. alternatus extended to Aomori prefecture, also bordering the Sea of Japan, and to the middle of Iwate prefecture.
显示更多 [+] 显示较少 [-]