76 
IOWA ACADEMY OF SCIENCE 
COMPARATIVE DISTRIBUTION FOR THE UNITED STATES OF COMMON 
1900 
1901 
1902 
21 Red clover rust 
+Iowa 
+Iowa 
22 Wheat rust 
—Country at large 
—Country 
+N. D., Kan., 111., 
Wis., Mo., Iowa 
23 Oats rust 
—Iowa 
—Iowa 
+N. D., Kan., Mo., 
Wis., 111., Iowa 
24 Barley rust 
25 Oat smut 
—Country at large 
— N. D. to Kan., Mo., 
Wis., 111. 
—Country at large 
26 Wheat smut 
—Country at large 
— N. D., Kan., Mo., 
Wis., Illinois 
—Country at large 
27 Corn smut 
—Country at large 
— N. D., Kan., Mo.. 
Wis., Illinois 
■ 
—Country at large 
