6.11
OCCURRENCE OF A NEW ANTHRACNOSE IN JAPAN, CAUSED BY COLLETOTRICHUM CAPSICI

Y YAGUCHI1, K UEHARA2, H NOJIMA3, T KOBAYASHI1and S NAKAMURA1

1Faculty of Agriculture, Tokyo University of Agriculture, Setagaya, Tokyo, 156, Japan; 2Okinawa Prefectural Agricultural Experiment Station, Naha, Okinawa, 903, Japan; 3Kagoshima Agricultural Experiment Station, Oshima Branch, Naze, Kagoshima, 894, Japan

Background and objectives
Occurrence of new anthracnose disease on papaya fruits (Carica papaya ) caused by Colletotrichum capsici was found at Miyako Island, Okinawa prefecture located in the south-western part of Japan in 1994. These lesions were initially water-soaked, light brown spots. They gradually enlarged, became sunken and turned blackish brown. Numerous acervuli of anthracnose were produced on fruit lesions. Conidia were falcate, and abundant black setae were found. Subsequently the anthracnose fungus was found to cause black spots on pumpkin fruits (Cucurbita maxima) at Okinawa Island in 1995; stem blight of chrysanthemum (Chrysanthemum morifolium) and leaf blight of hibiscus (Hibiscus spp.). In 1996, it was also found to cause damping-off of seedlings of statice (Limonium spp.) at Tokunoshima Island, Kagoshima prefecture, and in 1997 on decayed fruits of sweet pepper (Capsicum annuum) at Amami Island and Tanegashima Island, Kagoshima prefecture. These were first records of Colletotrichum capsici in Japan.

Results and conclusions
The morphological characteristics of the fungus are as follows:
Anthracnose of papaya: conidia are falcate to fusiform, apices acute, 24.2-34.8x2-4 Ám. Appressoria are medium brown, clavate, and 11.6-8.4 Ám.
Anthracnose of pumpkin: conidia are falcate to fusiform, apices acute, 22.2-29.3x2.8-4.2 Ám. Appressoria are medium brown, clavate, 13.7x11.3 Ám.
Anthracnose of chrysanthemum: conidia are falcate to fusiform, apices acute, 24.5-28x2.8-4 Ám. Appressoria are medium brown, clavate.
Anthracnose of hibiscus: conidia are falcate to fusiform, apices acute, 24.5-28x2.8-4 Ám. Appressoria are medium brown, clavate.
Anthracnose of statice: conidia are falcate to fusiform, apices acute, 21.3-25x3.3-4.8 Ám. Appressoria are medium brown, clavate.
Anthracnose of sweet pepper: conidia are falcate to fusiform, apices acute, 27.3-32.3x3.5-4 Ám. Appressoria, medium brown, clavate.
These pathogens were identified as Colletotrichum capsici (Syd.) Butler & Bisby [1, 2]. As all isolates have a wide host range, it is feared that the disease will spread to other areas of Japan.

References
1. Sutton BC, 1980. The Coelomycetes. p 537.
2. Sutton, BC, 1992. In Colletotrichum: Biology, Pathology and Control. CAB International, Wallingford, UK, pp.11-12.