10 BULLETIN 645, U. S. DEPABTMENT OF AGEICULTUEE. 



large as the sprayed, there would have been 344.1 boxes of fruit in- 

 stead of 300, or a gain of 14.7 per cent. The "russet" grade is smaller 

 in all cars than either the " fancy " or " bright." All large, coarse 

 fruits, were packed in the " plain," although they might be classed as 

 "brights." Table 4, although it contains the data given by a com- 

 mercial concern, does not indicate as great a difference as really 

 existed. On the unsprayed trees there were many fruits so small and 

 of such poor qualitj- that they were never sent through the packing 

 house. 



Grapefruit grown about 1 mile from that discussed in Table 4 was 

 sprayed with a different material, soda-sulphur. The spraj^ed and 

 unsprayed fruit was picked on the same day. The number of fruits 

 per box from the sprayed trees averaged, for the same grades given in 

 Table 4, 47.8, 51.7, 56, and 53.4 per box, respectively ; from the un- 

 sprayed trees, 52.3, 56.7, 59.5, and 0, respectively. The ; ' russet " 

 fruit in both cases was much smaller than any of the other grades. 

 Taken as a whole, the fruit from the sprayed and unsprayed trees 

 averaged 51.5 and 57.8 fruits per box, respectively, which gives a 

 percentage difference of 12.3 in the number of fruits in favor of 

 spraying. In another instance grapefruit from sprayed trees aver- 

 aged 50.2 fruits per box as compared with 57.8 fruits from un- 

 sprayed trees in adjoining rows; a difference of 15.2 per cent in 

 favor of sprayed fruits. 



The reduction in size following rust-mite attack accounts, to a 

 certain extent, for the small number of boxes produced in 1911, when 

 practically all the unsprayed citrus fruit was "russet," and about 

 half was " black russet," or about two sizes smaller than it would have 

 been had it not been affected by rust mites. One test shows that 66 

 sprayed fruits filled the same box as 99 unsprayed fruits picked from 

 an adjoining row, or a difference of 33^ per cent. From orange trees 

 sprayed with lime-sulphur, 1-25, April 22, 1911, 338 fruits averaged 

 3.29 inches in diameter. The skin of this fruit was smooth and the 

 texture good. From unsprayed adjoining orange trees 1,234 fruits 

 averaged 2.58 inches. It would require 112 of the former to fill the 

 average orange box and 226 of the latter, or twice as many. 



The reduction in size in also shown by the average weight of tne 

 fruit. In a miscellaneous lot of oranges, graded commercially, 575 

 " brights " weighed 241 pounds and 575 " russets " weighed 225^ 

 pounds, which made a difference of 6^ per cent. This fruit, of 

 course, had been picked at the same time and from the same grove 

 and the collection represented all the different sizes. The fruit had 

 not received any spraying. In another lot. 75 "bright" grapefruit 

 which had been sprayed thoroughly throughout the season weighed 

 99.75 pounds, and 75 fruits which had received no spraying through- 

 out the year weighed 88 pounds, which makes a difference of 11.77 

 per cent. 



