52 
BULLETIN" 1474, U. S. DEPARTMENT OF AGRICULTURE 
Like the experimental spraying, the results of these commercial 
tests are not quite so striking as was the case in 1922. The maximum 
control on oranges is 100 per cent, and the minimum only 5 per cent, 
and this minimum control is apparently no better than the best of 
the unsprayed groves. There is a maximum control of 99 per cent 
on grapefruit and a minimum control of per cent on the sprayed 
groves. The latter is not as good as the best of the unsprayed groves. 
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Fig. 14. — Comparison of grading of fruit with respect to melanose blemish in 
sprayed and unsprayed orange groves in 1923. Bordeaux-oil emulsion was used 
by the owners 
The combined results of the commercial spraying tests are given in 
Table 13. 
Table 13 shows a surprisingly small proportion of fruit entirely 
free of melanose markings and also a very small proportion showing 
melanose as occurring in a very high degree. In general, applica- 
tions of Bordeaux-oil emulsion made for citrus-scab control before 
April 1 gave fairly good control of melanose, but it was more satis- 
factory wherever the applications were made just in advance of the 
onset of the May rains. Applications later than this were much less 
effective. 
