Abstract
Most of the native cyclamen varieties were resistant, and many recent popular cultivated varieties such as "pastel" were suceptible to anthracnose caused by the pathogen. In main production areas, damage caused by this disease has recently decreased, because of cultivation with subirrigation to escape conidia dispersion. Judging from the characteristics of pathogen; colonial color, spore shape and size, production of ascus, ascus shape and size and hyphal growth of 16-32°C, the pathogen of cyclamen anthracnose was identified as Glomerella cingulata (Colletotrichum gloeosporoides).
Healthy cyclamen plants produced anthracnose symptoms when inoculated with Colletotrichum acutatum from antracnose diseased strawberry. When the pathogen was inoculated to the susceptible variety "Pink Rose", small brownish lesions appeared 3 days after inoculation on leaves, the lesions spread to the upper parts of the plants and finally the plant wilted and died. In the resisitant variety "Victoria", much smaller brownish lesions appeared on the inoculated leaves, but lesions did not spread to the upper plant parts and only the leaf ridge of inoculated leaves died. Colletotrichum gloeosproides of cyclamen antracnose attacked "Toyonoka" and "Nyoho" varieties of strawberry. "Nyoho" was more severly damaged than "Toyonoka".
The isolate collected from Tochigi Prefecture was highly susceptible to benomyl, but moderately resistant to procymidone and diethofencarb. Otherwise, the isolate from Kumamoto Prefecture was highly susceptible to diethofencarb and moderately resistant to benomyl and procymidone. Collettrichum acutatum of strawberry was moderately resistant to the above 3 agricultural chemicals.
