ギンドロ由来のイソプレン合成酵素遺伝子を、

To monitor the quantity and period changes in willow seed of river, we investigated the flowing willow seed in water. The survey sites were the Toyohira river, Tyubetsu river, Teshio river and Tokachi river. The survey was conducted three points on every river between snowmelt flood season that occur in willow seeds dispersal and ordinary water-level season. Plankton net was used to catch the willow seeds.

In early June, it was just starting to catch seeds on trap at every river. The volume peak of flowing willow seeds were; Toyohira river was in early June, Tyubetsu river was not, Teshio river was in early June and early July and Tokachi river was in early July. There are little seeds collected at the Tyubetsu river.

The results also show that the quantity vary in all sorts of seeds according to the season. These results can be basic information for willow management in the river channel.

クビアカツヤカミキリは、モモ、スモモ、ウメ、サクラなどのバラ科樹木に被害を及ぼすが、文献上では寄主としてカキノキ、クワ、ハコヤナギ属、ヤナギ属、コナラ属など多くの樹種が知られる。本種のリスク管理を行うには、これらを含めた多くの樹種において、本種の寄主としての適性を解明することが重要である。このため、15科24種の樹木の細枝に本種孵化幼虫を接種して、25℃で30日間飼育後に生存幼虫の体重を測定した。その結果、孵化幼虫の体重に対して、バラ科ではソメイヨシノ、オオヤマザクラ、リンゴ、ウメ、スモモ、ナシにおいて26～137倍まで発育したが、ビワでは4.6倍、ウワミズザクラでは1.6倍でほとんど発育しなかった。バラ科以外では、サワグルミが14.4倍、シダレヤナギが17.8倍まで発育した。