Jan. 15,1925 
Ecological Relations of the Smut of Maize 
173 
Such a local culture is likely to produce 
other infections in adjoining nodal tis¬ 
sues and thus produce a pseudosystemic 
development of the disease. 
(6) Apparent partial smut control 
with fungicidal sprays has been shown 
to be due to host injury by the spray, 
resulting in a reduced vegetative ac¬ 
tivity, a circumstance which involves 
a correspondingly lessened production 
of smutted tissues. Wherever the smut 
was lessened by fungicides, a similar 
reduction in yield occurred. 
(7) Planting numerous varieties of 
corn on several successive dates in an 
attempt to avoid infection gave only 
negative results. 
(8) Strains of corn can be secured 
by inbreeding which show great vari¬ 
ations in susceptibility and resistance 
to smut. Their behavior in different 
regions is being studied in an attempt 
to discover whether a difference may 
exist in the corn-smut organism. This 
phase of the problem is now being 
studied at Manhattan, Kans. 
LITERATURE CITED 
(1) Arthur, J. C., and Stuart, William. 
1896. REPORT OF THE BOTANICAL DEPARTMENT. 
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1900. corn smut. In Ind. Agr. Exp. Sta. 12th 
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Bibliography, p. 130-135. 
(3) Brefeld, Oscar. 
1883. ustilago maydis d. c. In his Untersuch- 
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(4) - 
1895. INFECTIONEN MIT MAISBRANDCONIDIEN. In 
his Untersuchungen aus dem Gesammtgebiete 
der Mykologie, Heft 11, p. 52-92. 
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1908. ON THE TOXIC ACTION OF BORDEAUX MIX¬ 
TURE AND OF CERTAIN SOLUTIONS ON SPORES 
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(6) Hecke, L. 
1907. DIE TRIEBINFEKTION BEI BRANDPILZEN. In 
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(7) Hitchcock, A. S. 
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(8) - and Norton, J. B. S. 
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(9) Keitt, G. W. 
1915. simple technique for isolating single¬ 
spore strains of certain types of fungi. In 
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(10) Kellerman, W. A. 
1891. EXPERIMENTS WITH CORN SMUT. In KanS 
Agr. Exp. Sta. Bui. 23, p. 101-104. 
1900. A FOLIICOLOUS FORM OF SORGHUM SMUT 
AND NOTES ON INFECTION EXPERIMENTS. In 
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(12) McAlpine, D. 
1910. THE SMUT OF MAIZE AND ITS TREATMENT. 
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illus. 
(13) MacMillan, H. G. 
1918. AN EPIDEMIC OF CORN SMUT FOLLOWING 
hail. In Phytopathology, v. 8, p. 584-585. 
(14) Melchers, L. E. 
1921. ECOLOGIC AND PHYSIOLOGIC NOTES ON CORN 
smut, ustilago zeae. (Abstract). In Phy¬ 
topathology, v. 11, p. 32. 
(15) Pammel, L. H., and Stewart, F. C. 
1893. PREVENTION OF CORN AND OATS SMUT. In 
la. Agr. Exp. Sta. Bui. 20, p. 721-728. 
(16) Piemeisel, F. J. 
1917. FACTORS AFFECTING THE PARASITISM OF 
ustilago zeae. In Phytopathology, v. 7, p. 
294-307. Literature cited, p, 307. 
(17) Potter, Alden A. 
1914. HEAD SMUT OF SORGHUM AND MAIZE. In 
Jour. Agr. Research, v. 2, p. 339-372, pi. 31-37. 
Literature cited, p. 369-371. 
(18) - and Melchers, L. E. 
1917. ECOLOGICAL OBSERVATIONS ON USTILAGO 
zeae. (Abstract). In Phytopathology, v. 7, 
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(19) Selby, A. D., and Hickman, J. F 
1897. corn smut. In Ohio Agr. Exp. Sta. Bui. 
78, p. 92-96. 
(20) Stuart, William. 
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smut. In Proc. Ind. Acad. Sci. 1895, p. 96-99. 
