70 
IOWA ACADEMY OF SCIENCE 
COMPARATIVE DISTRIBUTION FOR THE UNITED STATES OF COMMON 
1900 
1901 
1902 
1 Apple and pear 
blight 
-fAlleghany region 
—Iowa and central 
-tOhio to N. Dakota 
2 Black-rot of cab- 
bage 
-fMass. to Ohio 
-fSouthern Texas 
—Northern states 
-f- Texas 
—Iowa 
3 Potato-rot 
—Atlantic coast states 
-fPacific Coast 
-fN. Eng. to Mich. 
Absent in Iowa, Cal. 
and northwest 
4 Downy mildew of 
grape 
-flowa 
6 Peach curl 
-f Eastward 
■flowa 
-tEastward 
6 Plum pocket 
