Abstract
A new leaf spot disease of corn (Zea mays L.), “Kappanbyo” has been found to occur in Hokkaido since 1956.
Round, brownish gray spots, 1∼3mm. in diameter, with brown or brownish purple margin and light yellow halo are found numerously on leaf blades, leaf sheaths or rarely on stems of corn plants.
The causal fungus does not attack any plant other than corn plant.
From the results of the studies on the morphological characters of the fungus, it is considered that the fungus is a new species belonging to the genus Kabatiella Bub. emend. Karakulin.
The technical description of the causal fungus, Kabatiella zeae Narita et Y. Hiratsuka, is given.
