Abstract
In 1977, necrotic rings of fairy ring onZoysia matrellaL. are recognized at the golf course of Yachiyo Country Club, Hiroshima Prefecture. From these fairy ringsLepista snbnuda HONGO. is detected at the portion of plant roots area in the soil andHelminthosporium sp. is detected at the necrotic leaves, stems and roots of the plant. The Difolatan, N- (1, 1, 2, 2-tetrachloroet-hylthio) -4-cyclohexene-1, 2-dicarboximide, was effective to cure the disease at the concentrations of 1 to 250, 500 and 1, 000.
