10 



BULLETIN 29, XJ. 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. 1 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- 



Fig. 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 



i 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 moro time for spraying than the operation for brown- 

 rot and curculio, when only the fruit needs to be trealed. 



