PEACH SCAB AND ITS CONTROL. 57 



may be used with safety as a summer spray for peaches either alone or 

 with arsenate of lead. In the latter case, however, the same pre- 

 cautions should be taken against arsenical injury that are observed 

 when the lead arsenate is appUed alone. It is altogether probable 

 that thorough appMcations of finely divided sulphur of any type wiU 

 control peach scab. 



From this evidence, the writer recommends for peach-scab control 

 (a) self -boiled lime-sulphur (8-8-50) and (b) finely divided wettable 

 sulphur. With the paste (approximately 50 per cent sulphur) used 

 in the experiments previously reported, 5 pounds in 50 gallons is a 

 satisfactory dosage. These sprays appear to be equally efficient. Self- 

 boiled hme-sulphur is in most sections the cheaper, while wettable 

 sulphur is somewhat easier to apply and leaves a less conspicuous 

 residue upon the fruit. The cheapness of self-boiled lime-sulphur 

 and its efficacy in preventing or diminishing injury from arsenate of 

 lead make it very satisfactory for the first fungicidal appHcation, 

 while the fact that the wettable sulphur leaves little stain upon the 

 fruit makes that the more desirable for the final treatment. While 

 for many cases this combination of the two sprays appears to be the 

 most desirable, the final choice should be made by the individual 

 grower in the light of these facts and of his own needs and preferences. 



Cost of Treatment. 



Selby (1898, p. 260), working in Ohio, estimated that the cost of 

 spraying peach trees was less than H cents per tree for each appU- 

 cation in fohage. Scott and Ayres (1910, p. 21) reported that with a 

 power outfit in Georgia they were able to make four applications of 

 summer spray, two containing arsenate of lead •(2-50) and three 

 containing self-boiled lime-sulphur (8-8-50) for 5f cents per tree. 

 The trees were medium-sized 7-year-old Elbertas. These authors 

 considered that under southern conditions three applications should 

 be made for 4^ cents per tree. Blake and Farley (1912, p. 70-71), 

 working in New Jersey with a hand outfit, reported making four 

 summer appUcations, two containing arsenate of lead (2-50) and three 

 containing self -boiled lime-sulphur (8-8-50) on 5-year-old Elbertas 

 for 5.59 cents per tree. The writer, working imder the direction of 

 Mr. W. M. Scott at Cornelia, Ga., in 1910, kept accurate records of the 

 cost of spraying with a hand outfit. These data, which are reported 

 more in detail by Scott and Quaintance (1911, p. 38), show that the 

 cost of three applications, two containing arsenate of lead (2-50) and 

 two containing self-boiled lime-sulphm' (8-8-50), on 7-year-old trees 

 was 2.76 cents per tree. The conditions for this work, however, 

 were unusually favorable. At Fort VaUey, Ga., where a power 

 outfit was used, but where other conditions were less favorable than 

 at Cornelia, the cost of similar treatments, as reported by the same 



