54 
BULLETIN 1474, U. S. DEPARTMENT OF AGRICULTURE 
the year was considerably less severe than is usually the case, as indi- 
cated by the relatively small percentage of very severe infection on 
the unsprayed parts. 
Table 13. — Comb-hied results of commercial spraying for melanose control on 
orange and grapefruit groves at various points in Florida in 1923 
Treatment 
Variety 
Num- 
ber of 
groves 
Melanose infection 
Absent 
Very- 
slight 
Slight 
Me- 
dium 
Severe 
Very- 
severe 
Sprayed 
Unsprayed 
Sprayed 
Unsprayed 
Sprayed 
Unsprayed 
Homemade Bor- 
deaux 
Commercial Bor- 
deaux 
Sprayed early « 
Sprayed in April 2 
Sprayed in May 3 
Orange 
do 
Grapefruit 
do 
Orange and grapefruit. 
do 
.do. 
Per cent 
13 

8 

10 

Per cent 
49 
2 
48 
2 
49 
2 
53 
33 
45 
Per cent 
26 
23 
26 
20 
26 
22 
Per cent 
7 
34 
11 
40 
9 
37 
Per cent 
4 
35 
Per cent 
1 
6 
1 
8 
1 
7 
1 Groves sprayed in February or March for citrus-scab control. 
2 Spraying" completed before May rains set in. 
3 Spraying started and completed after May rains set in. 
Commercial spraying in 1924. — Again in 1924 counts were made in 
groves sprayed by the owners with Bordeaux preparations for mela- 
nose control. The groves selected were representative and scattered 
throughout the citrus belt. They included old seedling properties as 
well as rather young budded groves. The results of these findings 
are recorded in Figures 16 and 17. 
Table 14. — Combined results of commercial spraying for melanose control on 
orange and grapefruit groves at various points in Florida in 1924 
Treatment 
Variety 
Nunf- 
ber of 
groves 
Melanose infection 
Absent 
Very 
slight 
Slight 
Me- 
dium 
Severe 
Very 
severe 
Sprayed 
Unsprayed 
Sprayed 
Unsprayed- _. 
Sprayed 
Unsprayed 
Homemade Bor- 
deaux 
C ommercial Bor- 
deaux 
Orange 
do 
Grapefruit 
do 
Orange and grapefruit. 
do 
Per cent 
68 
13 
68 
18 
68 
16 
69 
65 
Per cent 
19 
16 
21 
37 
20 
28 
19 
22 
Per cent 
9 
24 
9 
23 
9 
23 
Per cent 
3 
21 
2 
16 
3 
18 
3 
3 
Per cent 
1 
15 

5 

10 

1 
Per cent 

11 

1 

5 


Because of a lighter melanose outbreak than in former years, the 
arbitrary grading represented in Figures 16 and 17 was made more 
strict than formerly. Only those fruits entirely free of melanose 
were placed in the first grade, those very slightly and slightly blem- 
ished were placed in the second grade, and those moderately, se- 
verely, and very severely affected were placed in the third grade. On 
oranges the effectiveness of the spraying ranged from the maximum 
