704 Report oF THE HoRTICULTURIST OF THE 
once that the disease may spread very rapidly under favorable 
circumstances. Damp locations and damp cool weather are 
generally considered most favorable to the spread of the disease. 
On trees carefully sprayed early in the season the fungus has 
little chance to get a foothold, so that if spraying is begun soon 
after the fruit buds start to open, and continued until the middle 
or last of June, that is to say, three or four weeks after the fruit 
has set, the disease may be largely prevented. 
It is clear that much more good may be accomplished by a 
timely early spraying than could possibly be secured by the same 
treatment later in the season, since the early spraying prevents 
the development of the disease in its incipient stages while the 
later spraying has to contend with the disease after it has ‘become 
widely scattered and well established. 
. The scab continues to develop throughout the season whenever 
the weather conditions are favorable. . This was noted this 
season especially with unsprayed White Doyennés on which the 
_ amount of scabby fruit increased to a marked degree between 
the first of July and the middle of September. Similar obser- 
vations have been made by Jones, who found that the amount of 
scabby fruit on an unsprayed Flemish Beauty tree increased from 
fifty-five per cent July 6 to sixty-nine per cent July 28, and to — 
seventy-two per cent August 31.* 
Injury from spraying.— Greene + has found that, at least with 
some varieties, late spraying with the Bordeaux mixture causes a 
russet appearance on the fruit and therefore advocates but two 
treatments with this mixture after the fruit sets, making the 
second treatment about ten days after the blossoms fall. This 
difficulty was not noticed this season with either the White 
Doyennés or the Seckels sprayed three times after the blossoms 
fell, thus bringing the last spraying as late as June 28. 
Number of sprayings.—Just how many sprayings will be 
found profitable in an ordinary season has not yet been definitely 
‘determined and further experiments on this point are desirable. 
No doubt the number of treatments and the strength of the mix- 
ture may well be varied according to the character of the season. 
*Bull. 28, Vermont Exp. Sta., 1892, p. 31. 
+ Bull. 48, Ohio Exp. Sta., 1893, p. 11, also proceedings of the Western New 
- York Hort, Soc., 1894, p. 65. 
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