Abstract
The causal fungus of the leaf spot disease of Gomphrena globosa was isolated at Fukuoka, and its pathogenicity was proved by inoculation experiments. Infection took place k etc een two and four days after inoculation and sporulation began after a few weeks.
In morphological and cultural characters, the fungus is much resembling Macrosporium Solani, M. Corotue or M. Porni and produces on the host plant long, tapering, slnder-beahed conidia arising singly at the tips of conidiophores. No attempts were succoedccd to produce conidia by ordinary cultural methods. But, on the hyphae which were cut into small pieces and rendered to dry, were produced conidia in keeping them in the moist chamber for several days. These conidia were quite similar to natural ones.
The organism is identified morphologically with Alternaria Gomphrenae, Togashi. on the characters of the cultured fungus, however, it is quite different from Togashi's description. Some comparative studies of these points have been tried.
