50 
BULLETIN 1474, U. S. DEPARTMENT OF AGRICULTUBE 
ing a decided perference for fruit free of blemishes. That year a 
large number of groves were sprayed for the prevention of this 
disease. For comparison with results obtained in experimental 
spraying, a careful check was niade on a number of these groves 
scattered well over the entire citrus belt. The counts were made in 
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Fig. 13. — Percentages of first, second, and third grade fruit with respect to 
melanose blemish, from groves sprayed by the owners in 1922 with Bordeaux- 
oil emulsion. Grading of fruit in similar groves that were not sprayed is given 
for comparison 
the same manner and by the same persons who made final counts 
on the experimental plots. In order to present the data from these 
counts in simple graphic form, fruits free of melanose blemishes 
and those only slightly affected were arbitrarily combined into the 
first grade: fruits slightly and moderately affected were placed in 
the second grade: and those severely and very severely affected were 
placed in the third grade. The results obtained in 23 groves by 
commercial growers in spraying orange and grapefruit trees for 
melanose in 1922 are shown in Figure 13. 
