UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 759 
Contribution from the Bureau of Plant Industry 
WM. A. TAYLOR, Chief 
Washington, D. C. PROFESSIONAL PAPER June 19, 1919 
THE LEAF-SPOT DISEASES OF ALFALFA AND 
RED CLOVER CAUSED BY THE FUNGI PSEU- 
DOPEZIZA MEDICAGINIS AND PSEUDOPEZIZA 
- "TRIFOLIT, RESPECTIVELY ~_~ 
; - By 
FRED REUEL JONES, Pathologist, Cotton, Truck, and 
Forage Crop Disease Investigations 
CONTENTS 
Page Page 
Scope of the Investigation . . . . . . 1 | The Fungi—Continued. 
EEESIAEMCTH a his a 0) m0! < is) le: i'a,) 2 Reported Conidial Stages of These 
Economic Importance ...... 2 Only elie tiatseiie aueleudelet ante \- 9 
Description of the Disease on Alfalfa 3 ' Physiology ofthe Fungi ..... 11 
Description of the Disease on Red Pathogenicity of the Fungi . .. . 19” 
MPM a al od ate a, a) re. 4 | Life History of the Causal Organism in 
DREN alto Wee eo. eh 58 5 Relation to the Host Plants ... 2 27 
EEE oie eis ote) Ss se 5 American Studies Bearing on Life 
Synonomy of Pseudopeziza trifolii . 5 BLIStory ueeiane oat eiheueerben toner ice iP MOA 
Synonomy of Pseudopeziza medi- Method of Overwintering .... 28 
Oe TLE GARE Eee ee Nm 6 Method of Distribution . ... . 30 
Comparative Morphology of the Fungi 6 | Summary . .). :...% Ae tdley ek NAS 35 
Morphological Characters in Culture 8 | Literature Cited .......4.-. 36 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1919 
