LIME-SULPHUR MIXTURES FOR SUMMER SPRAYING. 7 
pounds to 50 gallons, and both fruit and foliage of the peach were 
somewhat injured. It is possible, however, that under certain con- 
ditions the two substances might be used together on the peach 
without injury, as indicated by reports received from one of our 
correspondents; but according to the data at hand the combination 
can not be recommended for the peach. 
PEACH FOLIAGE INJURY TEST. 
Before the chief experiments of the season were undertaken a 
series of foliage tests was made at Marshallville, Ga., to determine 
the effect of several different mixtures on peach leaves. The Red 
River and the Elberta varieties were used and the trees were sprayed 
about two weeks after the petals had fallen. 
With prepared or factory-boiled lime-sulphur solution at the rate 
of 1 gallon to 30 gallons of water, injury to the foliage began to show 
three days after the application was made, and a week later a large 
percentage of the leaves had dropped. At a strength of 1 to 50, and 
even at 1 to 75, this solution caused severe injury, resulting in a par- 
tial defoliation of the trees. A strength of 1 to 100 also injured the 
foliage considerably and caused a few leaves to drop. A homemade 
wash boiled over a fire forty-five minutes and diluted so as to contain 
only 1 pound of lime and three-fourths of a pound of sulphur to 50 
gallons of water slightly injured the leaves, causing some shot-holing. 
It would seem, therefore, that there is little hope for boiled lime- 
sulphur solution as a fungicide for peach trees in foliage. On account 
of the injury, these plots were not carried through the season to 
determine the fungicidal effect of the boiled wash. 
In the experiments made during 1907 the self-boiled lime-sulphur 
mixture made of 15 pounds of lime and 10 pounds of sulphur to 50 
gallons of water did not injure peach foliage on trees sprayed as many 
as five times. This was rather surprising, and the results of the work 
were published with some misgivings. The first work of the follow- 
ing season, therefore, was to determine what injury, if any, would 
be produced by the mixture under the most severe test. An excel- 
lent grade of lime was secured and hot water used to slake it. It was 
soon proved that by using the minimum amount of water required 
to slake the lime and letting the hot mass of lime and sulphur stand 
for thirty or forty minutes, a large percentage of the sulphur went 
into solution, combining with the lime to form sulphids and thiosul- 
phate as in the boiled wash. The mixture gradually became thinner 
and a reddish liquid bubbled up from the bottom. It seems that the 
top layer holds in the heat sufficiently to continue the cooking for 
an hour after the lime is slaked. The mixture made in this manner 
injured the leaves badly, causing considerable defoliation; but when 
[Cir. 27] 
