Description of Gracilacus yokooi n. sp.(Tylenchida: Paratylenchidae) from Mulberry Roots in Japan with Some Observation on its Ecology

概要

論文の詳細を見る
Gracilacus yokooi n. sp., which was found in the soil around mulberry roots is described and some observations on its ecology are presented. This species resembles G. acicula, which has been reported by Yokoo (1970) as Paratylenchus aciculus BROWN, 1959. It differs from G. acicula in having four lateral lines, swollen females, a more posterior location of the excretory pore, and relatively commonly occurring males. It is also closely related to G. ivorensis (Luc et DE GUIRAN), G. crenata CORBETT, and G. straeleni (DE CONINK), but can be distinguished from the first species by its longer spear and slender conoid tail shape which relatively invariant, from the second species by its shorter spear and more anterior vulva, and from the last species by its more posteriorly located vulva and smaller b-value. This species is parasitic on mulberry, and is distributed in Shikoku, Kyushu, and the southern half of Honshu. Populations of G. yokooi emerged in the soil in the middle spring, increased in the summer reaching a maximum in August, and then decreased in the fall. They were hardly found during the winter. The highest density of G. yokooi was detected in soil around mulberry roots 50cm deep. The second highest was at 80cm deep. Jpn. J. Nematol. 12: 15-20 (1983)
日本線虫学会の論文