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 applied alone. It is altogether probable 
that thorough applications of finely divided sulphur of any type will 
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 lime-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 application, 
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 1^ cents per tree for each appli- 
cation in foliage. 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 4J cents per tree. Blake and Farley (1912, p. 70-71), 
working in New Jersey with a hand outfit, reported making four 
summer applications, 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 under 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-sulphur (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 Valley, 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 
