. Diseases of field crops. Plant diseases. 52 California Agricultural Extension Service [Cir. 121 The small, light-red, pustules of crown, or leaf, rust, Puccinia corona fa, which attacks only oats among the cereals, are found mainly on the leaves. They are slow to open and covered with a thin membrane of the plant epidermis. This fungus disease is less destructive than stem rust. In the latter disease, long, dark-red or black pustules of rust spores, P.. Fig. 32.—Leaf-blotch disease of rice. graminis var. avenae (fig. 38, p. 62), break out on the leaves and on the leaf sheaths which enclose t
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. Diseases of field crops. Plant diseases. 52 California Agricultural Extension Service [Cir. 121 The small, light-red, pustules of crown, or leaf, rust, Puccinia corona fa, which attacks only oats among the cereals, are found mainly on the leaves. They are slow to open and covered with a thin membrane of the plant epidermis. This fungus disease is less destructive than stem rust. In the latter disease, long, dark-red or black pustules of rust spores, P.. Fig. 32.—Leaf-blotch disease of rice. graminis var. avenae (fig. 38, p. 62), break out on the leaves and on the leaf sheaths which enclose the stem (fig. 31). The thin epidermis of the plant curls back from these pustules in ragged margins. The plants may be badly injured and die without forming grain. No tried varieties resistant to rust can be recommended at present for California. Consult the Division of Agronomy, College of Agriculture, Davis, for further information. Smut.—Two types of smut—covered and loose—attack oats. In cov-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Smith, Ralph E. (Ralph Eliot), 1874-1953. Berkeley, Calif. : College of Agriculture, University of California