甜菜
Hosts of "Cercospora beticola" include sugar beets ("Beta vulgaris"), swiss chard ("Beta vulgaris" L. subsp. "cicla)" and other leafy greens. Symptoms include the random distribution of spots with brownish red rings which eventually cause leaf collapse. Older leaves will have spots of larger diameters as rings grow outward. Conidia are not observable by the unaided eye