Distinguishing characteristics of some forage-grass Distinguishing characteristics of some forage-grass diseases prevalent in the North Central states distinguishingch747alli Year: 1946 12 CIRCULAR 74 7, U. S. DEPARTMENT OF AGRICULTURE DISEASES OF ANNUAL GRASSES SUDAN GRASS Bacterial Spot Bacterial spot, caused by Pseudomonas syringae Van Hall (Bacterium hold Kenclr.), attacks several grasses and is common on Sudan grass {Sorghum vulgare Pers., var. sudanensis Piper and Hitchc). Initial infections appear as circular to elliptical water-soaked spots on the lower leaves. These spots soon becom
Distinguishing characteristics of some forage-grass Distinguishing characteristics of some forage-grass diseases prevalent in the North Central states distinguishingch747alli Year: 1946 12 CIRCULAR 74 7, U. S. DEPARTMENT OF AGRICULTURE DISEASES OF ANNUAL GRASSES SUDAN GRASS Bacterial Spot Bacterial spot, caused by Pseudomonas syringae Van Hall (Bacterium hold Kenclr.), attacks several grasses and is common on Sudan grass {Sorghum vulgare Pers., var. sudanensis Piper and Hitchc). Initial infections appear as circular to elliptical water-soaked spots on the lower leaves. These spots soon become dry and papery and are light- colored (fig. 12). The disease appears soon after . seedlings emerge in spring and progresses with plant development throughout the entire growing period, gradually spreading from the lower leaves over all the others. Disease development is favored by periods of warm, moist weather. Figure 12.—Bacterial spot on Sudan grass. Bacterial Stripe Bacterial stripe, caused by Pseudomonas an- dropogoni (E. F. Sm.) Stapp, attacks several grasses and is common on Sudan grass. Initial infections appear on the leaves as long, narrow, irregular stripes (fig. 13). These soon dry, be- come pigmented, and are covered with an abun- dance of dry exudate. Severely infected leaves dry and wither. Stripe first appears about midsummer and continues until plant maturity. Disease development is favored by periods of warm, moist weather. Figure 13.—Bacterial stripe on Sudan grass.
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