Abstract
In November 2003, diseased leaves with lesions characterized were found on ginkgo (Ginkgo biloba L.) planted on the roadside in Setagaya, Tokyo, Japan. These lesions were brown spots with yellowish margin, and salmon pinkish acervuli and black perithecia were formed on their surface. Conidia are aseptate, hyaline, cylindrical, obtuse at both ends, and measured 17.9～20.4×5.1～7.7 µm (av. 18.4×6.9 µm). Appressoria are clavate or slightly irregular and brown colored, 8.9×9.6 µm. Perithecia are globoid and elliptic, black, 114〜178 µm in diameter. Asci are 8 spored in two rows, hyaline, clavate, 33.2〜63.8×5.1〜10.2 µm (av. 43.5×7.8 µm). Ascospores are hyaline, aseptate, cylindrical to fusiform, 12.8〜17.9×5.1〜7.7 µm (av. 17.1 ×6.4 µm). The pathogenicity was confirmed by the inoculation test. The causal fungus was identified as Glomerella cingulata (Stoneman) Spaulding & Schrank (=Colletotrichum gloeosporioides (Penz.) Penz. and Sacc). Anthracnose of ginkgo was proposed as a new disease in Japan.
