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10 BULLETIN 29, U. S. DEPARTMENT OF AGRICULTURE. 
ing is done, the convenience of facilities, as well as the purpose for 
which the spraying is done. 
The type of road construction in orchards on slopes of chert land 
over which spraying outfits must be hauled is shown in figure 3. 
Three men operate each outfit and in orchards 6 to 12 years old 
on smooth land will spray 500 to 600 trees per day when in the dor- 
mant state and 800 to 1,000 trees per day when in leaf.t. These same 
units would apply to apple trees at about the same age. 
As a rule, peach trees are sprayed three times a year—once in 
March for San Jose scale with the concentrated lime-sulphur solu- 
Fic. 3.—The southeastern slope of an orchard on chertland, showing the road construction used in 
spraying trees and hauling fruit. 
tion and twice for brown-rot and scab with the self-boiled lime- 
sulphur mixture, once soon after the petals fall, and again about three 
or four weeks later. In the two later sprayings arsenate of lead is 
added to the lime-sulphur mixture as a remedy for the curculio. 
A few have found it necessary to make a third application with that 
mixture during the summer to prevent the brown-rot, especially on 
the late-maturing varieties. 
Some orchardists make their own lime-sulphur solution for San 
Jose scale at a cost of $3 to $4 per barrel. Others buy the solution 
1 The trees are sprayed in the dormant state for San Jose scale, and the bark on the entire tree must be 
wet with the spray mixture. This operation takes more time for spraying than the operation for brown- 
rot and curculio, when only the fruit needs to be treated. 
