Is Oviposition of the Japanese Horntail, Urocerus japonicus (Smith), Depressed by the Growth Promotion of Hinoki Chamaecyparis obtusa (Sieb. et Zucc.) Endl.?

概要

論文の詳細を見る
This study examines the influence of the growth state of Hinoki (<I>Chamaecyparis obtusa</I> (Sieb. et Zucc.) Endl.), estimated from its DBH and bark thickness; the body size of the Japanese Horntail (<I>Urocerus japonicus</I> (Smith)); and the presence of ovarian nematodes on the oviposition of the Japanese Horntail. When infected by ovarian nematodes, the potential fecundity of the Japanese Horntail decreased noticeably and the oviposition rate fell to almost half. There was no correlation between the growth state of Hinoki and the oviposition rate of the Japanese Horntail non-infected with nematodes. However, there was a negative correlation between the growth state of Hinoki and the oviposition rate of the Japanese Horntail infected with nematodes. The multiple regression analysis of the oviposition rate and number of oviposited eggs on the growth state of Hinoki, the body size of the Japanese Horntail, and the absence or presence of ovarian nematodes showed that the oviposition was affected by the absence or presence of ovarian nematodes and the body size of the Japanese Horntail. However, it was not affected by the growth state of Hinoki. Thus, the oviposition of the Japanese Horntail was not markedly depressed by the growth promotion of Hinoki.
日本森林学会の論文