Corn leaf spot _ Hongzhou agronomic

Symptoms and damage of leaves and shell leaves. Lesion, irregular, translucent, the edge of the Central gray, Brown, black, small, i.e. the ascomycetous yeasts pathogenic bacteria. Distribution in Jilin, Liaoning, Henan province. Pathogen Mycosphaerella maydis (Pass.) Lindau called corn cavity bacteria, an ascomycete sarcodina fungi. Germs ascomycetous yeasts, born in two-leaf, powder, or filled with initial burying health circular aperture exposed skin. Ascomycetous yeasts moment circle, near bar-capsule-shaped, size 35-55 × 7.5 — 8.5 (um). Ascospore moment circle, colorless, divide 1, diaphragm, slightly constricted, cells with oil drops 1-2, size 14-16 × 3.5-4 (um). In addition to the damage of corn, infecting Alopecurus, Sudan grass, etc. Transmission and disease conditions germs in the invalidity of the winter, and spring the following year on the formation of ascospores, primary infection. Cold and wet conditions susceptible. Prevention methods see corn leaf blight.