EXPERIMENTS WITH LIME AND SULPHUR 

 WASHES FOR THE SAN JOSE SCALE.* 



The "California wash" of lime, sulphur, and salt, and the 

 "Oregon wash" of lime, sulphur, and blue vitriol, have been for 

 many years the general reliance of the fruit growers of the Pa- 

 cific Coast for protection against the San Jose scale. In a letter to 

 me dated October 22, 1901, Prof. C W. Woodworth, of the Ento- 

 mological Department of the University of California, said that 

 "the lime, salt, and sulphur mixture is the sole dependence in this 

 state for killing the San Jose scale," and under the same date Prof. 

 A. B. Cordley, of the Entomological Department of the Oregon 

 Agricultural College and Experiment Station, wrote: "With us 

 the lime, salt, and sulphur compound is a very satisfactory remedy 

 for the San Jose scale, and is used very extensively. In fact, this 

 and the lime, sulphur, and blue vitriol compound are practically 

 the only ones used for winter sprays for this insect." As early as 

 1889 the California wash was the only winter remedy recommended 

 for the San Jose scale by the Secretary of the State Board of Hor- 

 ticulture in the Annual Report of the Board for that year; and in 

 1896 Prof. John B. Smith, State Entomologist of New Jersey, who 

 visited California for a special study of the San Jose scale and its 

 treatment there, found the lime, salt, and sulphur mixture one of 

 the "favorite insecticides" for that scale in California and on the 

 Pacific Coast generally.! 



The introduction of these insecticides in the East has been 

 long delayed, probably owing in large measure to unfavorable re- 



*The resuhs of these experiments were originally published in Bulletins 71 

 and 72 of the State Agricultural Experiment Station, printed respectively in 

 April and May, igo2. The first of these bulletins presented the results as appar- 

 ent March 21;; and the second, as shcnvn May 12. In the present article the con- 

 clusions of Bulletin 72 have been combined with those of 71, and to this have 

 been added the results of a later inspection made August 20. This may, con- 

 sequently, be taken as a revised and enlarged edition of Bulletin 71, and a sub- 

 stitute for that of Bulletin 72. 



fRep. Ent. Dept. N. J. Agr. Exper. Station, 1896, p. 551. 



