PEACH SCAB AND ITS CONTROL. 
39 
of infection by water-borne spores from lesions upon the subtending twig, only about 
25 uniformly scattered infections occurred. In striking contrast, the three fruits 
immediately adjacent, with excellent conditions for infection of this type, developed 
about 225 lesions each. Instead of being uniformly scattered over the wettable sur- 
faces of the fruits, as would be expected had they resulted from wind-blown spores, 
these lesions were massed about the peduncles and over the proximal portions of the 
wettable surfaces, gradually becoming less abundant toward the apices. Again, had 
the infecting spores been wind blown, the infection should have been practically 
equally prevalent and similarly situated upon the four fruits in question. 
Table VIII. — Summary of observations concerning the occurrence and location of scab 
lesions on unsprayed Elberta fruits and twigs in relation to spore dissemination, 
Cornelia, Ga., July 23, 1913. 
[The observed infections were on the wettable surfaces of the fruits, while the protected surfaces were not 
infected.] 
Fruit 
No. 
1.. 
2.. 
3.. 
4.. 
5.. 
6.. 
7.. 
8.. 
9.. 
10.. 
11.. 
12 2 
VS.'. 
14.. 
15.. 
16.. 
17.. 
18.. 
19.. 
202. 
21.. 
22.. 
23.. 
24.. 
25 2. 
Esti- 
ma- 
ted 
le- 
sions 
Num- 
ber. 
250 
250 
20 
225 
225 
250 
12 
250 
12 
250 
250 
20 
225 
225 
250 
20 
250 
250 
250 
25 
25 
250 
250 
250 
12 
Distribution 
of lesions. 
Aggregated . 
do 
Scattered . . . 
Distance Facilities 
from pe- for infec- 
tion by 
duncle to 
nearest 
lesion on 
subtending 
twig. 
Cm. 
.do 
do 
Scattered... 
Aggregated . 
Scattered . . . 
Aggregated. . 
do 
Scattered. . . 
Aggregated. . 
do 
.....do 
Scattered.. . 
Aggregated. . 
do 
do 
Scattered... 
do 
Aggregated.. 
do 
do 
Scattered. . . 
0) 
0.5 
.5 
.5 
water- oorne 
spores from 
subtending 
twig. 
Excellent . 
...do 
None 
Excellent . 
...do 
...do 
None 
Excellent . 
None 
Excellent. 
do.... 
None 
Excellent . 
...do 
...do 
None 
Excellent . 
...do 
...do 
None 
Poor 
Excellent . 
...do 
...do 
None 
Fruit 
No. 
26... 
27... 
28... 
29... 
303.. 
31... 
32... 
33... 
34... 
35... 
36... 
37... 
38 3.. 
39... 
403.. 
412.. 
42... 
43 2.. 
44... 
45... 
46 3.. 
47... 
48 2.. 
49... 
50... 
Esti- 
ma- 
ted 
le- 
sions. 
Num- 
ber. 
25 
250 
10 
250 
12 
250 
40 
60 
200 
225 
225 
225 
25 
250 
20 
25 
250 
10 
100 
250 
12 
250 
25 
225 
30 
Distance 
from pe- 
Distribution 
of lesions. 
duncle to 
nearest 
lesion on 
subtending 
twig. 
Cm. 
Scattered. . . 
16 
Aggregated . 
.5 
Scattered. . . 
20 
Aggregated . 
.5 
Scattered.. . 
C 1 ) 
Aggregated . 
.5 
Scattered.. . 
4 
do 
0) 
do 
0) 
Aggregated. . 
do 
do 
1 
1 
1 
Scattered . . . 
4 
Aggregated.. 
.25 
Scattered. . . 
8 
...'..do 
Aggregated.. 
.5 
Scattered. . . 
C 1 ) 
Aggregated.. 
1 
do 
.25 
Scattered.. . 
0) 
Aggregated.. 
1 
Scattered. . . 
0) 
Aggregated.. 
.5 
Scattered.. . 
( J ) 
Facilities 
for infec- 
tion by- 
water-borne 
spores from 
subtending 
twig. 
Poor. 
Excellent. 
Poor. 
Excellent. 
None. 
Excellent. 
Poor. 
None. 
Do. 
Excellent. 
Do. 
Do. 
None. 
Excellent. 
None. 
Do. 
Excellent. 
None. 
Excellent. 
Do. 
None. 
Excellent. 
None. 
Excellent. 
Do. 
1 No lesion on subtending twig. 
2 Fruit, apex up, borne upon a short spur. 
3 Fruit in favorable position for infection by water-borne spores from lesions on subtending twig, but not 
such lesion present. 
These data show (1) that every badly diseased fruit observed 
developed under excellent conditions for infection by means of 
conidia from twig lesions; (2) that in all cases where conditions were 
favorable for the passage of water-borne spores from lesions on the 
subtending twigs down the peduncles and over the wettable surfaces 
of the fruits severe infection resulted, the disease uniformly appearing 
most abundantly on the areas obviously most subject to this type of 
dissemination; (3) that in all cases where conditions precluded this 
type of dissemination only sparse infection occurred, the lesions being 
miscellaneously scattered over the wettable surfaces of the fruits in a 
