LIME-SULPHUR MIXTURES FOR SUMMER SPRAYING. 5 
During the past two years commercial lime-sulphur has been rather 
extensively tested as a summer spray by investigators and fruit grow- 
ers in different parts of the country, and the results have been some- 
what conflicting. A report of experiments conducted by Mr. R. Kent 
Beattie,“ of the Washington Agricultural Experiment Station, shows 
that a strength of 1 gallon of the solution to 11 gallons of water caused 
no injury to the fruit or foliage of Ben Davis and Jonathan apple 
trees and that it controlled apple scab. In the experiments reported 
later in this paper a strength of 1 to 20 injured apple foliage, and it 
would appear to be entirely unsafe to use it stronger than 1 to 25. 
Even the latter strength can not be recommended with full confidence. 
SELF-BOILED LIME-SULPHUR MIXTURE. 
The self-boiled lime-sulphur mixture is a combination of lime and 
sulphur boiled with only the heat of slaking lime and is primarily 
intended for summer spraying as a substitute for Bordeaux mixture 
where the latter is injurious to foliage or fruit. For most purposes 
Bordeaux mixture is the better fungicide and should be used except 
when likely to injure the plants to be treated. Peach foliage is so 
susceptible to spray injury that Bordeaux mixture can not be safely 
used as a summer spray on peach trees; neither can the sulphur 
sprays which contain any considerable quantity of sulphids in solu- 
tion. The self-boiled lime-sulphur mixture, however, when prepared 
as a mechanical mixture of lime and sulphur with orale a small per- 
centage of the sulphur in solution, is not injurious to peach foliage 
and in our experiments for two years past has proved to be a good 
fungicide. It may also prove useful in spraying some varieties of 
apples, like the Ben Davis and Jonathan, which are often seriously 
injured by applications of Bordeaux mixture. 
The mixture that appeared to be the most satisfactory in our experi- 
ments was composed of 10 pounds of lime and 10 pounds of sulphur 
to 50 gallons of water. However, 8 pounds of lime and 8 pounds of 
sulphur to 50 gallons of water may prove to be sufficient. This 
strength of mixture was not tried, but a 6—-6-50 formula used on 
peach and cherry trees gave good results, though not quite so good 
as the stronger wash. 
The mixture can best be prepared in rather large quantities—say 
20 pounds, or even 40 pounds at a time—so as to get enough heat 
to produce a violent boiling for a few minutes. Place the lime in a 
barrel and pour on enough water (about 3 gallons to 20 pounds) to 
start it slaking and to keep the suiphur off the bottom of the barrel. 
Then add the sulphur, which should first be worked through a sieve 
aThe Western Fruit Grower, January, 1909, p. 6. 
[Cir. 27] 
