CITKUS MELANOSE AND ITS CONTROL 
41 
Table 9. — Spraying experiments for melanose control with various materials on 
orange and grapefruit trees at Orlando, Fla., in 1922 
Materials used 
Lime-sulphur solu- 
tion. 
Copper soap 
do 
do 
Bordeaux-oil emul- 
sion. 
do 
do 
do 
do 
do 
Neutral Bordeaux- 
oil emulsion. 
do 
do 
Commercial Bor- 
deaux-oil emul- 
sion. 
do 
Improperly pre- 
pared Bordeaux- 
oil emulsion. 
do 
Bordeaux'oil emul 
sion. 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
Average of 12 no- 
treatment plots. 
Num- 
ber of 
appli- 
cations 
Proportions 
1-40 
^-0-3-50. 
do.... 
do.... 
1-1-50+1 
oil. 
per 
cent 
do 
do ... 


2-2-50+1 
oil. 
do.... 
do— . 
3-X-50+1 
oil. 
do—. 
do— . 
Approxim 
-50+% 
oil. 
do—. 
3-3-50+1 
oil. 
per 
cent 
per 
ately 
per 
cent 
2-x 
cent 
per 
3ent 
do.... 
do— 
do— 
do— 
do— 
do— . 


—do. 
...do-., 
—do. 
...do., 
—do-. 
..do—. 
..do—.. 
..do 
..do.—. 
..do 
.-do— 
..do 
.-do— 
-do 
-do 
Date applied 
Apr. 13 and 14, 28, 
May 23. 
Apr. 13 
Apr. 13, 28 
Apr. 13,28, May 23. 
Apr. 11 
Apr. 11, 29 
Apr. 11, 29, May 23 
Apr. 11 
Apr. 11,29 
Apr. 1 1, 29, May 22 
Apr. 13 
Apr. 13,28 
Apr. 13, 28, May 22 
Apr. 13, 29 
Apr. 12, 29, May 22 
Apr. 12,28 
Apr. 12, 28-29, 
May 23. 
Apr. 10 
Apr. 10, May 1____ 
Apr. 10, May 1,22. 
May 1,22, June 9_- 
Apr. 10-11, 25, 
May 10. 
Apr. 25, May 10,25 
May 10, 25, June 9. 
May 25, June 9-10. 
Apr. 12, May 10— 
Apr. 12, May 10, 
June 10. 
Apr. 20, May 20-22 
May 1, June 1 
May 10-11, June 10 
Apr. 20 
May 1 
May 11; no fruit.. 
May 20 
June 1 
June 10 
Apr. 12, May 11, 
June 10, July 10, 
Aug. 12, Sept. 13, 
Oct. 13, Nov. 10. 
Melanose infections 
Per Per 
cent cent 
21 
91.) 
Per 
cent 
26 
11 
22 
17 
11 
30 
3 
20 
19 
5 
4 

2 
2 
Per 
cent 
32 
Per Per 
cent cent 
17 4 
In view of the failure of sulphur sprays as a class to control 
melanose in 1921, it was considered unnecessary to use again a wide 
range of these materials. The following materials were tested : Lime- 
sulphur solution, copper soap, various strengths of alkaline Bordeaux 
mixture plus oil emulsion, improperly prepared 6 Bordeaux mixture 
6 Bordeaux mixture made bv pouring concentrated milk of lime into concentrated blue- 
stone solution. 
