SB 
818 . 
C576 
ENT No. 52, SECOND EDITION. 
ited States Department of Agriculture, 
DIVISION OF ENTOMOLOGY, 
L. O. HOWARD, Entomologist. 
THE LIME, SULPHUR, AND SALT WASH. 
By C. L. MARLATT, 
Entomologist in Charge of Experimental Field Work. 
JSE AGAINST THE SAN JOSE SCALE IN THE EAST. 
The experiences of the last two years with the use of the California, 
or lime, sulphur, and salt wash in the East have been in many cases 
of so satisfactory a nature as to cause numerous letters of inquiry, and 
indicate the need of a special circular of information. This wash is 
described and recommended in Circular 42 (second series) of this office, 
relating to treatment for the San Jose scale, and also in Farmers’ Bul- 
letin 127 on insecticides. But in these publications the information is 
very concisely given and none of the experiments on which are based 
the recommendations for the East are described. It is proposed in this 
circular to give a brief history of the employment of this wash in the 
East and to make such recommendations as the results justify. 
EARLY TESTS IN MARYLAND. 
With the discovery of the San Jose scale in Eastern nurseries and 
orchards the first thought naturally was to employ against it the washes 
which were very commonly used for its control in California and other 
Pacific coast regions. The results of the preliminary tests are recorded 
in the first general publication of this office on the San Jose scale, 
namely, Bulletin 3 (new series), pp. 57-71. Among many other tests 
made the lime, sulphur, and salt wash as used in California, and the 
Oregon wash, a slight variation of the latter, were the subject of careful 
experiments. This work was done by the writer, assisted by Mr. 
Coquillett, who, while the California agent of this Division, had employed 
the lime, sulphur, and salt wash in many combinations and was 
thoroughly familiar with its use on the Pacific coast. 
HOW THE WASHES WERE PREPARED. 
The washes referred to were made after the following formulas: 
California wash.—Lime, unslaked, 40 pounds; sulphur, 20 pounds; 
coarse salt, 15 pounds. Add 40 gallons of water to the above ma- 
terials, stirring thoroughly while the lime is slaking. Boil fully three 
