Appearance of Sporulation Ability after Emergence of Leaves Infected with Java Corn Downy Mildew Fungus, Peronosclerospora maydis
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Conidia of Java corn downy mildew fungus, Peronosclerospora maydis (Racib.) C. G. Shaw [Sclerospora maydis (Racib.) Butl.], were formed on the upper part of diseased corn leaves which were in the process of development or had just developed, but they were not formed on the basal part. This phenomenon was observed in each diseased leaf of a plant and also in both leaves with half-leaf and full-systemic symptoms. When inoculated plants were incubated at 25 C-20 C (daytime-night, 12 hr each) for different durations, the sporulating areas of developing leaves were narrow 20 and 30 days after inoculation (the 7th-8th and the 10th-11th leaves, respectively), being limited to the upper part of the leaves. After 40 and 50 days the sporulation occurred on the whole leaf surface of these leaves (the 7th-10th leaves), and the sporulating areas of newly developing leaves were quite wide (the 13th-14th and the 14th-15th leaves, respectively) compared with the areas of those after 20 and 30 days. The speed of leaf elongation on developing leaves was higher after 20 and 30 days (the 7th-8th and the 10th-11th leaves, respectively) than after 40 and 50 days (the 13th-14th and the 14th-15th leaves, respectively). Namely, the faster the leaf elongation, the narrower the sporulating area. These results indicate that sporulation ability is closely related to the host leaf growth and that the ability on a site of leaf appears after a certain period of time after the emergence of the leaf site.
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