PEACH SCAB AND ITS CONTROL. 47 
While many other spraying experiments were reported during this 
period and subsequently, no material advance was made until Scott 
(1907 and 1908), realizing that the copper sprays in their present 
state of development are too toxic for general application upon peach 
foliage, sought to develop an efficient fungicide which would be appli- 
cable to tender-foliaged plants without serious host injury. He con- 
ducted preliminary experiments with self-boiled lime-sulphur and 
reported very promising results in the control of peach scab. The 
same author (1909, p. 7-12) carried out further similar experiments 
and recommended (p. 11-12) self -boiled lime-sulphur treatments for 
the control of this malady. Scott and Ayres (1910) and Scott and 
Quaintance (1911) confirmed these results by extensive spraying 
experiments and gave detailed recommendations for the self-boiled 
lime-sulphur treatments. 
Lewis (1910) conducted peach-spraying experiments in which he 
used, comparatively, self-boiled lime-sulphur, home-boiled lime- 
sulphur, Bordeaux mixture, and certain proprietary fungicides, each 
preparation being applied alone and in combination with arsenate 
of lead. He reports self-boiled lime-sulphur as giving the most 
favorable results, his recommendations (p. 47) paralleling those of 
Scott and Ayres (1910). 
Clinton and Britton (1911, p. 604-618) sprayed peaches with self- 
boiled lime-sulphur, potassium sulphid, and certain proprietary- 
sprays . In certain applications, insecticides were added to the fungi- 
cides. These authors report most satisfactory results from the self- 
boiled Hme-sulphur and recommend its use. 
Blake and Farley (1911, p. 11-30), in an extensive series of peach- 
spraying experiments, made comparative tests of home-boiled lime- 
sulphur, self -boiled lime-sulphur, and certain proprietary fungicides. 
They regarded all the preparations used except self-boiled lime- 
sulphur and a sulphur paste as too toxic to be applied with safety to 
peach foliage unless made too dilute to be efficient. They recommend 
the use of self -boiled lime-sulphur, which they state (p. 26) "is the 
best fungicide known at the present time for the control of peach scab 
and brown-rot." 
Norton and Symons (1912, p. 266-268), in continuation of pre- 
vious experiments, tested self-boiled lime-sulphur and various pro- 
prietary preparations in peach-scab control. They reported that 
self-boiled lime-sulphur gave the most favorable results. 
These and like experiments appear to show (1) that Bordeaux mix- 
ture and various other copper sprays, lime-sulphur, and liver of sul- 
phur, in combination with arsenate of lead, in concentrations suffi- 
ciently strong to control scab, are too toxic to be applied generally as 
summer sprays for the peach; (2) that peach scab may be controlled 
by spraying with self-boiled lime-sulphur, alone or mixed with arse- 
