PEACH SCAB AND ITS CONTROL. 
25 
of one fruit, even under the most severe conditions of natural infection (PI. Ill, fig. 1). 
Nos. 428 to 436 and 444 to 452, inoculated with Dematium sp. and with the undeter- 
mined fungi A and B, developing no disease upon the areas of inoculation, confirm the 
negative results of preceding parallel experiments and may be considered as supple- 
mentary controls. 
In this series, including 32 fruits, 15 scattered infections, which have not been dis- 
cussed, occurred upon uninoculated areas. These evidently resulted from occasional 
chance infections, which obviously can not be entirely precluded in work of this type. 
Their number, however, is so small in comparison with the number of infections 
resulting from inoculations that they are clearly negligible. Furthermore, the areas of 
inoculation were so chosen with reference to the parts of the fruit subject to natural 
infection that even this minimal amount of chance infection appears to have been 
escaped, as is witnessed by the freedom from disease of all the 100 control areas. 
Table V. — Summarized results from a typical fruit -inoculation experiment, Cornelia, Ga., 
1913. 
Inoculation. 
Number of infections after stated number of days (28, 42, 52, or 60) 
had elapsed. 
On inoculated areas. 
On uninoculated areas. 
Total infections. 
Serial 
No. 
Wet- 
table 
surface. 
Pro- 
tected 
surface. 
"Wettable surface. 
Pro- 
tected 
surface. 
On in- 
oculated 
areas. 
On unin- 
oculated 
areas. 
Source and medium. 
Above in- 
oculated 
area. 
Below in- 
oculated 
area. 
28 
42 
52 
60 
28 
42 





6 
10 
















"6 







52 




55 
24 
61 











o 

25 
10 
6 




6 
60 



12s 
35 
70 

"6 


"o 
"o 
"o 
3.3 
15 
42 
"o 
28 
_ 


o 




s 














'6 







42 
o 
52 
n 
60 



"6 

1 

"6 


'6 
"6 
'6 
12 


! 


o 
8 
s 
















42 
— 


















o 
8 


"6 







52 

1 

1 











1 


3 



"6 


2 

"6 
60 

1 

'6 
n 
28 





n 
42 













o 


■8 




"6 







52 
~ 



(1 



















"6 
o 



"6 
60 

1 





"6 


6 





'6 
28 


o 
















8 


~6 







42 




5 
12 
18 
























52 




10 
65 
103 












o 
45 
14 
32 
"6 




"o 
60 



ioi 
83 
136 

"6 


"6 
"6 
"6 
58 
19 
50 
"6 
28 























'6 







42 























6 



[ 

1 
Q 
52 

1 

1 







o 
3 
1 

1 

J 


o 

1 


2 

' 6 
60 
Distilled water: 
421 
422 
423 
424 
425 
426 
427 
428 
429 
430 
431 
432 
433 
434 
435 
436 
437 
438 
439 
440 
441 
442 
443 
444 
445 
446 
447 
448 
449 
450 
451 
452 























'6 














n 



63 
4s 
m 

;; 
'6 


23 
4 
8 
"6 











8 







o 

"6 


1) 





Do 
Do 
Do 

01 
oi 



o! 




3 
1 

o| o 
I 


1 

0, 
o 

2 

C. carpophilum 
Do 
545 
6 41 
8 49 


Do 
o 
1 
Undetermined fun- 













i 
'6 









o 
I 








20 
4 
8 
'6 


I 

6 
1 
"6 


"6 
"6 
i 



"6 
















6 


I) 


1) 

a} 
Do 
(b) 
Do 
aft 
Dematium sp 
Do 
aft 
a0 
Do 
fb) 
Undetermined fun- 
(b) 
Do 
Of) 
Do 
(b) 
Prune decoction (0.09 
per cent): 
Do 

Do 
- 
Do 
1 
C . carpophilum 
Do 
cl2 

Do 

Undetermined fun- 
"6 







1 

(d) 
Do 
... 

(b) 
Do 
(0) 
Dematium sp 
Do 
o 
o.-i o 
aC 
(b) 
Do 

"6 
.. 

(K 
Undetermined fun- 
(J) 
Do 


(d) 
Do 
(b) 
a Considered as supplementary controls. 
b Considered as supplementary controls; no records 
were made for these fruits on these days. 
48408°— Bull. 395—17 4 
c See discussion of results on p. 24. 
d Fruit shed before results were conclusive. 
