PEACH SCAB AND ITS CONTKOL. 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 seK-boiled lime-sulphur, 8-8-50, or 

 wettable sulphur, 5 pounds ia 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. 



MidseOfSon 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 deshable 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 ■unpublished results of the writer.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 inteUigent modifica- 

 tion,^ 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 faU. 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. 



I For suggested modifications, see Scott and Quaintance (1911, p. 38-40). 



