. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 376 FUNGOUS DISEASES OF PLANTS Where the disease is very abundant it would be practicable, on plats to be employed for seed, to weed out smutted plants prior to final maturity. The most recent recommendation with respect to seed treatment is to soak five hours in cold water, and then ten minutes in water at 540 C. IV. SMUT OF CORN Ustilago Zea (Beckm.) Ung. Arthur, J. C, and Stuart, W. Corn Smut. Ind. Agl. Exp. Sta. Ann. Rept. 12: 84-135. 1900. Hitchcock, A. S., and Norton, J. B. S
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 376 FUNGOUS DISEASES OF PLANTS Where the disease is very abundant it would be practicable, on plats to be employed for seed, to weed out smutted plants prior to final maturity. The most recent recommendation with respect to seed treatment is to soak five hours in cold water, and then ten minutes in water at 540 C. IV. SMUT OF CORN Ustilago Zea (Beckm.) Ung. Arthur, J. C, and Stuart, W. Corn Smut. Ind. Agl. Exp. Sta. Ann. Rept. 12: 84-135. 1900. Hitchcock, A. S., and Norton, J. B. S. Corn Smut. Kan. Agl. Exp. Sta. Built. 62: 169-212. pis. 1-10. 1896. Knowles, E. L. A Study of the Abnormal Structures Induced by Ustilago Zeae-mays. Journ. Myc. 5: 14-18. pis. 2-7. 1889. The common smut of corn (Zea mays) occurs in all regions where maize is grown. It is productive of considerable losses at times, and it is probable that in many corn- growing sections the yearly loss will aver- age as high as 5 per cent. It may vary, however, from o to about 25 per cent. Habitat relations. This fungus some- times causes enormous enlargements of various parts of the host, occurring in staminate and pistillate flowers, on the stalk, especially at the nodes, and also in the leaves. The abnormalities or swellings are usually prominent and often attain the size of several inches in diameter. Very careful experiments throughout a long period of time have made it clear that infection takes place through any young and growing tissue, but that the plant is not affected, as a rule, until a foot or more in height. The spores retain their vitality in the soil for some time, and the sporidia may, by a sprouting process, be propagated and dissem- inated through manure or compost spread upon the land. The. Fig. 191. Ustilago Zeje: Smut of Corn. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearan
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