396 NEW YORK STATE MUSEUM 



stroyer of San Jose scale. Our object in experimenting with this 

 mixture was simply to be in position to answer more definitely 

 inquiries regarding this wash which, it may be remembered, was 

 extensively boomed by certain agricultural papers last spring as 

 one of the most effective applications for the destruction of San 

 Jose scale. Experiments had been previously tried by others in 

 different parts of the coimtry, and the above results are simply 

 confirmatory thereof. 



Wash lo was composed of two ounces of mercuric chlorid to 50 

 gallons of bordeaux mixture, the latter containing 5 to 8 poimds 

 excess of lime. This wash was prepared by adding all the ingre- 

 dients to boiling water, and while the chemical action seemed to 

 be perfect it was difficult to strain. It was a dark slate color. 

 This wash was applied Ap. 18 to 7 trees each on the upper end of 

 rows 19 and 20. 



July 22 there was a large number of living scale on the trees 

 which, though not badly injured, showed less growth and were not 

 as vigorous as others, and on Sep. 23 it was seen that these trees 

 were only a very little better than the check row. 



Wash II composed of 14 pounds of lime, 6 poimds of sulfur and 

 6 pounds of sulfid of soda, was prepared by bringing 5 or 6 pails 

 of water nearly to a boil, the lime added, followed at once by the 

 sulfur. The mixture was thoroughly stirred till the lime was slaked, 

 then the sulfid put in, which latter operation was followed by fur- 

 ther chemical action. Boiling was continued 30 minutes and a 

 grayish green color obtained. This mixture was applied Ap. 15 

 to rows 14 and 15. 



Observations July 22 resulted in finding some living scales on 

 these trees, and this was confirmed Sep. 23, at which time a small 

 number of young scale insects were observed on the foliage and 

 young twigs, otherwise the results were as good as in the case of 

 washes i and 2. 



Wash 12 composed of 14 pounds of lime, 11 poimds of sulfur and 

 II pounds of sulfid of soda to 50 gallons of water, was prepared on 

 the afternoon of the 13th, but owing to trouble with the spray ap- 

 paratus, was not applied till the following morning. There was 

 very little crystallization though reheating was probably necessary. 

 The wash was prepared by bringing 5 or 6 pails of water nearly to a 

 boil, the lime was added, followed immediately by the sulfur. 

 This was stirred thoroughly till the lime was slaked, then the sul- 

 fid was put in, which was followed by further chemical action. 

 Boiling was continued for 30 minutes and the compound at this 



