16 CIRCULAR 7 4 7, IT. S. DEPARTMENT OF AGRICULTURE 



The development of disease-resistant strains of grasses offers the 

 only practical control measure. Resistance to many of the diseases 

 reviewed has been demonstrated (1 , 2, 4, and $)- 3 The presence of 

 physiological races in certain of the fungi discussed has been recog- 

 nized (2, 5, and £). 4 Such knowledge will aid greatly in the develop- 

 ment of grass improvement programs. Improvement programs are 

 in progress with all the major grass species reviewed (1, 3, 7, and 8). 



LITERATURE CITED 



(1) Ahlgeen, H. L., Smith, D. C, and Nielsen, E. L. 



1945. BEHAVIOR OF VARIOUS SELECTIONS OF KENTUCKY BLUEGRASS, POA 

 PRATENS1S L., WHEN GROWN AS SPACED PLANTS AND IN MASS SEED- 



ings. Amer. Soc. Agron. Jour. 37: 268-281. 



(2) Allison, J. L. 



1945. SELENOPHOMA BROMIGENA LEAF SPOT ON BROMUS INERMIS. Phvto- 



pathology 35: 233-240, illus. 



(3) Burton, G. W. 



1942. TIFT SUDAN, A UTOPIA GRASS FOR [THE] SOUTHEAST. Soiltb. Seeds. 



man 5 (1): 7, 31, 35, illus. 



(4) Chamberlain, D. W., and Allison, J. L. 



1945. THE BROWN LEAF SPOT ON BROMUS INERMIS CAUSED BY PYRENOPHORA 



bromi. Phytopathology 35: 241-248, illus. 



(5) Davis, W. H. 



1930. TWO PHYSIOLOGIC FORMS OF USTILAGO STRIAEFORMIS (WESTD.) 



niessl. Phytopathology 20: 65-74. 



(6) Hardison, J. R. 



1944. SPECIALIZATION OF PATHOGENICITY IN ERYSIPHE GRAMINIS ON WILD 



and cultivated grasses. Phytopathology 34: 1-20. 



(7) Hayes, H. K., and Schmid, A. R. 



1943. SELECTION IN SELF- POLLINATED LINES OF BROMUS INERMIS LEYSS., 



FESTUCA ELATIOR L., AND DACTYLIS GLOMERATA L. Amer. SoC 



Agron. Jour. 35: 934-943. 



(8) Karper, R. E. 



1940. sweet sorghum cross improves sudan grass. South. Seeds- 

 man 3 (12): 8, 18, 19, 23. 



(9) Tsiang, Y. S. 



1944. variation and inheritance of certain characters of brome 



grass, bromus inermis leyss. Amer. Soc. Agron. Jour. 36: 

 508-522. 



3 Italic numbers in parentheses refer to Literature Cited. 



4 See also Fischer, G. W., and Levine, M. N. summary of the recorded 



DATA ON THE REACTION OF WILD AND CULTIVATED GRASSES TO STEM RUST (PUCCINIA 

 GRAMINIS), LEAF RUST (P.- RUBIGOVERA), STRIPE RUST (P. GLUMARUM), AND CROWN 

 RUST (P. CORONATA) IN THE UNITED STATES AND CANADA. U. S. Bur. Plant IndllS., 



Plant Dis. Rptr. Sup. 130, 30 pp. 1941. [Processed.] 



U. S. GOVERNMENT PRINTING OFFICE: 1946 



For sale by the Superintendent of Documents, U. S. Government Printing Office 

 Washington 25, D. C. - Price 5 cents 



