Diseases of small grain crops Diseases of small grain crops in Illinois diseasesofsmallg35boew Year: 1939 98 ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 35 LEAF RUST Puccinia rubigo-vera, var. Secalis The leaf rust of rye, known also as brown rust, attacks none of the other cereals and has no other hosts among American grasses. It is comparable, among rye diseases, to the leaf rust of wheat, crown rust of oats and leaf rust of barley. Although it has. Fig. 38.—Leaf rust of rye. The pustules shown are the brown, summer-spore pustules, from which are shed the spores that serve to spread the ru
Diseases of small grain crops Diseases of small grain crops in Illinois diseasesofsmallg35boew Year: 1939 98 ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 35 LEAF RUST Puccinia rubigo-vera, var. Secalis The leaf rust of rye, known also as brown rust, attacks none of the other cereals and has no other hosts among American grasses. It is comparable, among rye diseases, to the leaf rust of wheat, crown rust of oats and leaf rust of barley. Although it has. Fig. 38.—Leaf rust of rye. The pustules shown are the brown, summer-spore pustules, from which are shed the spores that serve to spread the rust daring the growing season. like the other cereal rusts, a complicated life history which in- volves another host, the full life history seldom is completed. Appearance.—Leaf rust of rye is similar in appearance to leaf rusts of other cereals, with exception of color. On either surface of the rye leaf, small, oval, brown pustules are formed. These pustules break open as the rust develops, and powdery masses of reddish-brown summer spores are exposed, fig. 38. Elongated pustules may develop on the stem also, and these resemble short pustules of stem rust. Toward maturity of the plant, small, elongated, dark gray pustules appear, which do not immediately break through the epidermis. These pustules con- tain the winter spores. Life History.—Rye leaf rust is unique among cereal rusts because its winter spores germinate when they are formed in the fall and because it overwinters by means of its summer spores.
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