LIME-SULPHUR MIXTURES FOR SUMMER SPRAYING. IL 
The self-boiled mixture made of 10 pounds of lime and 10 pounds 
of sulphur to 50 gallons of water prevented the early infections of 
scab, but heavy rains soon washed it off and allowed late infections 
to take place, so that the percentage of scabby fruit at picking time 
was high. However, very little of the fruit was badly affected 
and the foliage had been almost entirely protected. This mixture 
almost completely controlled apple bitter-rot in an experiment con- 
ducted at Bentonville, Ark., in 1907, and in special cases it may prove 
to be a useful substitute for Bordeaux mixture as a summer spray 
for apple trees. 
The commercial lime-sulphur solution, two different brands of 
which were used, adhered better and remained effective longer than 
the self-boiled mixture. It controlled the scab fully as well as 
the 3-3-50 and almost as well as the 4-4-50 Bordeaux mixture. 
On varieties subject to serious injury from applications of Bordeaux 
mixture, such as Ben Davis and Jonathan, commercial lime-sulphur 
solution might be used to good advantage and is certainly worthy 
of trial. 
The use of arsenicals in the commercial lime-sulphur wash is an 
unsettled question. They are broken down by the sulphids and 
theoretically the combination would be exceedingly injurious to apple 
foliage. However, Paris green at the rate of 6 ounces to 50 gallons 
of the diluted solution used in these experiments apparently did no 
damage, but it would be somewhat risky to use the combination in 
extensive spraying operations until a further investigation is made. 
Arsenate of lead was not tested in combination with the commercial 
lime-sulphur solution, and an opinion as to its probable effect on the 
folhage when so used can not be expressed here. It was.used in the 
self-boiled wash without injury to apple foliage, but this would not 
be a criterion for the prepared wash. 
Dr. Charles Brooks, botanist of the New Hampshire Agricultural 
Experiment Station, in cooperation with the writer, conducted a 
similar set of experiments in that State, comparing the lime-sulphur 
sprays with Bordeaux mixture in the treatment of apple scab. The 
results were about the same as those reported in this paper. The com- 
mercial lime-sulphur solution controlled the disease fully as well as 
Bordeaux mixture, and the use of Paris green with it had no appar- 
ent injurious results. 
Approved: 
JAMES WILSON, 
Secretary of Agriculture. 
WasuineTon, D. C., March 9, 1909. 
[Cir. 27] 
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