60 
IOWA ACADEMY OF SCIENCE 
COMPARATIVE DISTRIBUTION OF COMMON FUNGUS DISEASES IN 
Name of Disease 
1870- 
1877 
1878- 
1881 
1882 1883 
jlSSl 
1885 
Bacteriaceae— 
] 
1 Apple and pear blight 
+ 
+ 
7 Bacteriosis of potato 
Peronosporeae— 
0 
0 
(?) 
- 
(a) 
10 Downy mildew of Shepherd’s Purse 
11 DnwTiy mildpw of Ipftiipp . . _ _ _ 
- 
- 
12 Afillpf flispfisp 
13 White rust of radish and Shepherd’s Purse ^ 
+ 
+ 
Exoasceae— 
14 Plnm pnplrpf .. . . .. 
-H : 
- 
- 
Ip Enlnrgpfl plum branphps 
Ifi Ppfiph pnrl 
- i 
- 
- 
17 Cottonwood curl 
I 
Erysipheae— 
IS Rnsp mildpvv 
IQ iVTildPw of npplp 
2A Pnwflpry milrlpw of phprry 
- 
-t- 
- 
- 
- 
21 Powdery mildew of grape 
-1- 
’80 
’83 
— 
— 
22 Powdery mildeiv of Dooryard Knotgrass 
23 Powdery mildew of Tiilae _ _ _ 
-i- 
— 
- 
— 
— 
24 Powder^’ mildew of pea _ 
+ 
- 
- 
- 
- 
25 Powdery mildew of grass 
