PEACH SCAB AND ITS CONTROL, 59 
These results show that where brown-rot, scab, and the curculio 
are serious factors, spraying is not only highly profitable, but that 
it is indispensable to commercial success. 
Recommendations for Spraying- 
scab only. 
Early varieties. — Spray with self-boiled lime-sulphur, 8-8-50, or 
wettable sulphur, 5 pounds in 50 gallons in the case of the paste 
(approximately 50 per cent sulphur) used in the foregoing experi- 
ments, about one month after the petals fall. 
Midseason varieties. — Spray as for early varieties, adding a similar 
application about three weeks later. 
Late varieties. — Spray as for midseason varieties, adding a third 
application about one month after the second. 
SCAB, BROWN-ROT, AND THE PLUM CURCULIO. 
In practice it is rarely desirable to spray for scab alone, .since in 
most sections where scab is seriously injurious brown-rot and the 
plum curculio must also be combated. In order to secure the most 
profitable combination treatment, therefore, certain deviations must 
be made from the ideal individual schedules, while modifications 
must be made to meet the needs of sections, seasons, and varieties. 
Recommendations for the control of brown-rot and the curculio are, 
consequently, inseparable from those for scab, and, though incidental 
to this paper, must be included. The recommendations for brown- 
rot are based upon the results of Scott (1907, 1908, and 1909), Scott 
and Ayres (1910), Scott and Quaintance (1911), and others, and upon 
unpublished results of the writer. That part of the schedule which 
relates to insect control has been kindly supplied by Mr. A. L. Quaint- 
ance, of the Bureau of Entomology, United States Department of 
Agriculture. 
While for obvious reasons ironclad recommendations are not 
attempted, the following schedule, subject to intelligent modifica- 
tion, 1 should be applicable in most commercial peach sections of the 
United States where scab is a serious factor. 
Early varieties. — The early varieties, such as the Greensboro, Car- 
man, Hiley, and those with similar ripening periods should be sprayed 
as follows: 
(1) With arsenate of lead and lime about ten days after the petals fall. This appli- 
cation may be omitted in sections where the curculio is not a serious factor. 
(2) With arsenate of lead and self-boiled lime-sulphur or finely divided wettable 
sulphur about a month after the petals fall. If the latter type of fungicide is used, 
the addition of lime, as in the first treatment, may be a desirable precaution against 
arsenical injury. 
1 For suggested modifications, see Scott and Quaintance (1911, p. 38-40). 
