262 



LESSONS IN AGRICULTURE 



will be saved from tin* moth and from the fungous dis- 

 eases, and the apple trees may yield a hundredfold. 



Applications to the State Experiment Station should 

 be made for the latest spray calendars. 



This exercise should by all means be carried out in 

 the public schools. 



Reference: Farmers' Bulletin, No. 243. 



FIG. 79. 



Courtesy of B. F. Johnson Pub. Co. 

 APPLES FROM SPRAYED AND UNSPRAYED BRANCHES 



Problems 



1. Our farm orchard contains four acres of apple 

 trees. How much will it cost to spray the orchard 

 with the lime-sulphur and lead arsenate? Lime-sul- 

 phur at 20 cents a gallon, and lead arsenate at 15 cents 

 a pound. 



2. The Bordeaux-lead-arsenate mixture, ready pre- 

 pared will cost $1 per gallon. This will make up fifty 

 gallons of spray material. How much could we save 

 by making our own mixture, if lime is 1 cent per pound, 

 and copper sulphate 10 cents per pound? (See Lesson 

 12.) 



3. Which is cheaper, lime-sulphur or Bordeaux f 



