ABSTRACT

An ambrosia beetle, Platypus quercivorus, is the vector of Japanese oak wilt, one of the most serious forest diseases in Japan. P. quercivorus is widely distributed in the main islands of Honshu, Kyushu and Shikoku, but there have been no records of P. quercivorus in Hokkaido, the northernmost main island in Japan. Because the mass mortality of oak trees caused by Japanese oak wilt is spreading northward in northern Honshu, we sampled P. quercivorus in 20 forest sites in the southernmost part of Hokkaido by using pheromone traps. Five P. quercivorus (two males and three females) were collected from four sites. Because oak species distributed in Hokkaido are all susceptible to Japanese oak wilt, monitoring and control measures will be needed to prevent the spread of Japanese oak wilt in Hokkaido.

摘要

甲虫（Platypus quercivorus）是日本橡树枯萎病的病媒，是日本最严重的森林疾病之一。南美白对虾广泛分布于本州，九州和四国等主要岛屿，但在日本最北端的主岛北海道却没有南美白对虾的记录。由于本州北部日本橡树枯萎引起的橡树大量死亡向北蔓延，因此我们使用信息素诱捕器在北海道最南端的20个森林地点取样了食蟹对虾。五只食蚁兽（两个雄性和三个雌性）是从四个地点收集的。由于分布在北海道的橡树种都易受日本橡木枯萎的影响，因此需要采取监视和控制措施，以防止日本橡木枯萎在北海道的蔓延。