果樹類の本邦新灰星病菌について

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Since some years, an outbreak of brown rot has been noticed in fruit trees in northeastern Japan. Apothecia of this brown rot fungus were collected, probably for the first time in Japan, by Tetsuo Kudo in l963 from mummified cherries in an orchard in Akita Prefecture. The fungus has the following morphological characteristics : sporodochia grey;conidia hyaline or light-colored, lemon-shaped or ellipsoidal, l0-20×6-l2μ, with no disjunctors ; microconidia hyaline, spherical, about 3μ in diameter ; apothecia Pecan Brown (Ridgway), funnel-shaped, 5-l5 mm in diameter, with stipes of l5-50 mm in length ; asci cyllndric-clavate, l30-210x7.5-l2μ, 8-spored ; ascospores hyaline or slightly colored, ovoid to elongate-ellipsoidal, unicellular with rounded ends, 9.5-l8x6.8μ. When cherry fruits are inoculated with this fungus, there occur typical symptoms of brown rot, with abundant conidia. On potato dextrose agar media the fungus spreads rapidly, forming uniform colonies with abundant conidia. The conidia germinate readily in 0.l% dextrose solution, and hyphal anastomoses commonly occur beween developing hyphae. The grey sporodochia, large apothecia, and abundant conidial production distinguish this fungus from both Monilinia fructigena and M. laxa. On the other hand, these and other characteristics of this fungus agree with those of Monilinia fructicola (Winter) Honey, and so the authors have identified this fungus with M. fructicola. This same species has also been isolated from plums, apricots, peaches, and pears in this area.(Received May 2, l966).
日本植物病理学会の論文
1966-12-25

果樹類の本邦新灰星病菌について

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