30 BULLETIN 866, U. S. DEPARTMENT OF AGRICULTURE. 
Table 10. — Effect of various sprays on bitter rot of apples ( Virginia). 
Plat No. 
Tree 
No. 
Spray used. 
Copper 
sulphate 
in spray. 
Total 
apples. 
Total 
apples 
with rot. 
Apples 
with rot. 
Dropped 
apples. 
Apples 
injured 
by 
spray. 
Defolia- 
tion. 
1916. 
3 
1 
2 
3 
1 
2 
3 
1 
2 
3 
1 
2 
3 
1 
2 
3 
1 
2 
3 
Pickering (A) 
do 
Per cent. 
0.13 
.13 
.13 
.065 
.065 
.065 
.23 
.23 
.23 
.115 
.115 
.115 
2,522 
2,724 
2, 543 
2,934 
2,576 
1,852 
1,820 
91 
2,068 
1,312 
1,797 
1,961 
3,184 
3,277 
1,196 
3,375 
1,628 
2,036 
2,495 
2,701 
2,527 
2,918 
2,574 
1,846 
1,810 
86 
2,000 
1,297 
1,794 
1,961 
3,144 
3,265 
1,196 
2,566 
1,200 
1,885 
Per cent. 
99 
99 
99 
100 
100 
100 
100 
95 
97 
99 
100 
100 
99 
100 
100 
76 
74 
93 
{ :! 
f .3 
J 4-1 
1 .9 
J .3 
I - 2 
.5 
15.2 
.1 
.5 
10.3 
.6 
3.5 
2.0 
17.0 
.0 
Per cent. 
Per cent. 
Per cent. 
3 . 
3 
. do . 
4 
..do... 
4 
do 
4 
. do 
5... 
Pickering (C) 
do 
5 
5 
. do .. 
6 
...do 
6 
do 
.. do 
6 . 
Check 
Do 
Do 
Bordeaux, 4-5-50 
do 
1.00 
1.00 
1.00 
.50 
.25 
.13 
.50 
.25 
.13 
.50 
.50 
...do 
1917. 
A! 
Pickering (A) 
do 
3.0 
5.2 
3.0 
6.3 
10.0 
10.0 
12.7 
9.3 
45.5 
35.7 
12.3 
6.0 
10.5 
5.5 
96.2 
50 
A 2 
""82*3" 
""56 
A 3 
do 
"'"95." 7" 
""56 
Pickering (C) 
do 
B x 
93.6 
30 
B 2 
""*98."6' 
"'"is 
B 3 .. 
do 
Bordeaux, 2-2-50 
Bordeaux, 2-1-50 
20 
25.0 
98.0 
15 
20 
Check 
Bordeaux, 4-4-50 
Pickering (C)..-. 
Barium water 
1.0 
.58 
.60 
55.8 
20 
1918. 
5,724 
2,594 
3,736 
4,552 
200 
50 
736 
Check.... 
Bordeaux, 4-4-50 
1.00 
Bitter rot was first seen in this orchard on July 10. On July 13, 
the time of the second spray application, there was a little bitter rot 
on two of the Bordeaux-sprayed trees and on one check tree. A 
small unhealthy tree in plat 5 showed the most bitter rot. On July 
26, at the time of the third spraying, the following observations 
were made: 
Plat 5.— All trees showed a little bitter rot. 
Plat 4. — All trees showed a little bitter rot. 
Plat 5. — One tree showed a little bitter rot, and the other two trees 
a good deal of rot, 
Plat 6. — One tree showed rot at the top, while the other two were 
practically free from rot. 
Bordeaux-sprayed plat. — Some trees showed no rot and others 
quite a little. On an average, the trees did not show as much rot as 
the check trees. 
Check plat. — A good deal of rot was seen, more than on. the other 
trees in the orchard. 
