Mar. 15, 1925 
Degeneration Diseases of Potatoes 
511 
•<30 
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£ 
> 1 
CS CO 1 CO CO* T-* HH CO CO WrH 
1 1 
Aphids 
Feeding 
period 
Days 
13 
13 
13 
13 
12 
12 
1 
12 
12 
12 
13 
13 1 
13 
13 
Approxi¬ 
mate 
number 
per hill 
+ -H-H -H -H-H -H -H -H + + ++ 
S SS S Si § S§ Jo Si »o »o los 
t-H HH 
Height 
when 
inocu¬ 
lated 
Cm. 
17 
15 
7-15 
17-30 
15-25 
7-15 
20-25 
17 
10-15 
16 
17 
17 
10-15 
s 
s.g 
a> c3 
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mo o 0 mm 
All sources were plants of the Green Mountain variety. 
