EXPERIMENT STATION BULLETINS. 285 



different parts of the state, but it was sold by druggists in many places 

 last rear at $2.50 to $2.75 per 100 lbs. When purchased in bags in 

 carload lots it can be laid down in most points in Michigan at |2.15 

 per 100 lbs. Battelle and Renwick, 163 Front street, New York, offer 

 it in bags in 100-pound lots, f. o. b. New York, at $2.30 per 100 lbs. and 

 at |1.90 in carload lots. The freight to Michigan points on small lots 

 would be 45 to 50 cents per 100 lbs. When shipped in carload lots the 

 freight would be not far from 25 cents per 100 lbs. When put up in 

 barrels the price would be about ten cents more per 100 lbs., but as this 

 would be fully equaled by the reduction in freight upon lots less than 

 100 lbs., and the sulphur will be in better condition, it will generally be 

 advisable to order the sulphur in barrels if to be shipped in small lots 

 by freight. As will be observed, the cost is estimated at the usual price 

 in barrel lots for soluble oils and the price put down for sulphur and 

 lime is about what is charged for these materials when purchased in 

 quantities of one hundred to five hundred pounds. 



Material. Amount. 



Cost Cost of Cost of Total cost 



per unit. Materials. Preparation, per 50 gals. 



Soluble oils .... 21/0 gals. 50c. $1.25 — $1.25 



K-U Mixtures- 

 Kerosene 10 gals. 10c. 1.00 ) o ^ 90 



Lime 40 lbs. i^c. .20 [ ^^- "^'^^ 



Sulphur-Lime Mixtures — 



Sulphur 15 lbs. 3c. .45 \ -. _ ^9-, , 



Lime 25 lbs. i/oc. .121/2^^^' •'^^" 



From the above it will be seen that the soluble oil sprays figured at 

 the lowest prices at which they are furnished, cost 2i^ cents per gallon, 

 while the K-L mixture cost practically the same. The sulphur and lime 

 mixture, after allowing liberally for the cost of its preparation and reck- 

 oning the materials at prices somewhat higher than sold for at retail in 

 sections where there is a large demand for them, cost slightly less than 

 11/^ cents per gallon. 



MAKING THE TEST. 



4 



The comparative test of the different mixtures was made in a peach 

 orchard near South Haven in which the trees were about eight years 

 old, under the supervision of Mr. F.' A. Wilken, Superintendent of the 

 South Haven sub-station. The San Jose scale had become very evenly 

 distributed through the orchard, but the trees had not been very seriously 

 injured. The soluble oils were prepared at the strength recommended 

 by the manufacturers, that is, one gallon of oil was used in twenty gal- 

 lons of water, and in order that the results of increasing the strength 

 of the application might be determined, duplicate experiments were 

 carried on, using one gallon of oil in ten gallons of water. The K-L 

 and sulphur and lime mixtures were at the usual strength as noted in 

 the above table. 



One of the claims made for the soluble oils is that they spread upon 

 the trees so that a somewhat smaller amount than is required of the 

 sulphur and lime will suffice. In this experiment twenty-five gallons 

 of each material was prepared and instructions were given to spray the 



