Spray Calendar. 179 



Spread lime in large shallow box, breaking into as small lumps as possible. 

 Dissolve the copper sulfate in six gallons boiling water; also dissolve the lye in 

 five gallons hot water. Keep separate. Sprinkle copper sulfate solution over 

 the lime. Follow with lye water. If the lime does not all crumble to a dust, use 

 clear water to finish. Screen the lime through a fine sieve, rub the sulfur through 

 the sieve into the lime, add the Paris green and thoroughly mix both with lime. 

 Lime should crumble to powder, not granules. 



Copper sulfate water must be used hot, or the copper will re-crystallizc. Mixing 

 should be done out of doors or in separate building, as lime in slaking becomes 

 very hot. 



Missouri Experiment Station Dust-Spray. 



To make 70 pounds of stock powder: 

 4 lbs. copper sulfate. 

 4 " quick lime. 



2 J gallons water in which to dissolve copper sulfate. 

 2^ " " " " slake quick-lime. 



60 lbs. air slaked lime thoroughly sifted. 



Dissolve the copper sulfate and slake quick-lime separately, each in 2^ gallons 

 water. Pour at same time milk of lime and copper solution into a third vessel 

 and stir thoroughly. Surplus water is then strained out and remaining wet material 

 is thoroughly mixed with the 60 pounds of air-slaked lime. All lumps must be 

 sifted out and the mixture must be perfectly dry. One pound each of sulfur 

 and Paris green may be added. 



These dust sprays are not recommended where water is readily available and 

 where liquid spray machines can be operated satisfactorily. Their fungicidal 

 value as demonstrated by various experiments is comparatively weak. 



SOLUBLE OR MISCIBLE OILS. 



These are preparations of petroleum oils, for sucking insects (scale, etc.), mixed 

 in such a way as to emulsify readily when poured into water. They are put on 

 the market under various names. They are ordinarily diluted 12 to 15 or more 

 times when used. That is, one gallon of the "soluble oil" is to be mixed with 

 twelve or fifteen gallons of water. After stirring, it is ready for use. In this respect, 

 they are exceedingly convenient and commend themselves to the orchardist. This 

 spray, however, costs considerably more than lime-sulfur. Some have used these 

 materials with excellent results, others report complete failure, while others find 

 that the results are inconstant in character. They are to be used only during the 

 dormant period in the strengths mentioned. At present it does not appear to be 

 safe to use them on trees in foliage. We recommend each grower to use these 

 mixtures experimentally until their efficacy has been more definitely established. 



FUMIGATION OF NURSERY STOCK. 



Some General Rules. 



Do not fumigate trees when they are wet. Fumigate from half to three quarters 

 of an hour. Do not leave the gas in the house over night. A house ten feet square 

 will answer for a nursery of one hundred acres. Find your space, figure amount 

 of chemicals needed and post in a convenient place for reference. 



