36 



FARMERS BULLETIN 



dentals, but naturally can not be construed to apply to such unusual 

 conditions as those bearing on a local shortage in chemicals due to 

 unprecedented freight congestion, or to a deficiency in the supply of 

 the chemicals in the United States generally. 



TABLE I. Cost of spraying. 



The figures of Table I show that it will cost from $3 to $5.50 per 

 acre per application to spray the average bearing grove. 1 The cost 

 per box is also seen to be from 1 to 1J cents for each application and 

 the cost per tree from 5 to 10 cents. To carry out any annual spray- 

 ing schedule it will cost about 6 cents per box, 20 cents per tree, 

 and about $15 per acre. The cost of spraying young trees is very 

 small. One nurseryman sprayed 40,000 trees with the oil spray 

 for less than one-sixth of a cent each. Young grove trees from 1 to 

 3 years old can be sprayed for about 1 cent each. 



PROFITS FROM SPRAYING. 



After many years of work it is still impossible to express the per- 

 centage of profits to be expected on money expended in spraying for 

 the control of citrus pests. This same condition, however, applies 

 to every grove operation in Florida. The profits which may arise 

 from following a spraying schedule are due to the raising of the 

 grade of the fruit and increasing the yield by preventing the devitali- 

 zation of the trees following insect attack. (Compare figs. 23 and 

 24.) A detailed statement of the profits a grower should expect from 



