CITEUS MELANOSE AND ITS CONTROL 
55 
control of 94 per cent to the minimum control of 17 per cent, and the 
best showing in the unsprayed groves was somewhat better than the 
least effective control by spraying. On grapefruit the sprays were 
very similar in effectiveness, since they ranged from a maximum con- 
trol of 91 per cent to a minimum control of 33 per cent. Again the 
least effective spraying was not so good as the best of the unsprayed 
checks. The combined data from these counts are given in Table 14. 
It is evident from Table 14 that melanose was not as severe as in 
former years. This is shown by the relatively small proportion of 
fruit affected severely and very severely. The control on grape- 
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Fig. 16. — Comparison of grading of fruit with respect to melanose blemish in 
sprayed and unsprayed orange groves in 1924. Bordeaux-oil emulsion was used 
by the owners 
fruit was about as good as on oranges, and commercial Bordeaux 
mixtures and homemade Bordeaux mixture gave practically the 
same results. There is not as much difference in the amount of mela- 
nose between sprayed and unsprayed fruit as has been the case in 
former years. This may possibly be accounted for by the fact that 
infection did not occur in large amounts until June, and by that 
time a great deal of the spray residue had probably weathered away. 
There were several rainy periods in March that resulted in a con- 
siderable leaf infection, but owing to the delayed blooming period 
very little fruit infection occurred in that month. The rainfall was 
somewhat more than normal, but for the most part the rainy periods 
were of insufficient duration to result in general infection. May was 
showery, but on the average considerably drier than usual, and up 
to the first of June little infection had occurred. General rains set 
