50 DISEASES OF ECONOMIC PLANTS 



cost of 10|^ cents a tree for three applications. This is the 

 cost of the bitter-rot treatment alone ; if the cost of the 

 arsenate of lead used for protection against the codling 

 moth be included, 1\ cents a tree for each apphcation should 

 be added/ 



PROFITS FROM SPRAYING 



Spraying protects the foliage and harvest from insect 

 and fungous attacks. — By properly spraying, perfect 

 produce and good yield are often obtained where the 

 omission of spraying would mean poor yield and diseased 

 products, or permanent injury to the plant in the case of 

 perennials. 



A marked increase in yield is often evident to even a 

 casual observer. To accurately judge this value in first 

 experiences some portion of the crop should be left un- 

 sprayed, and the yield from sprayed and unsprayed parts 

 should be carefully measured and the gain compared with 

 the cost of treatment. In the conduction of any large 

 business every small increase in profit and every saving 

 of leakage is important. 



Perfection of produce. — The quality as well as quantity 

 of the yield is improved by spraying. The perfect product 

 proves its excellence on the market by its ready sale and 

 the high price it commands. ^ 



One cannot afford to raise inferior produce. The in- 

 crease in quaUty, even if the quantity of the yield were 

 not affected, is sufficient reason for spraying. The keep- 



1 Scott, W. M., and Quaintance, A. L., U. S. Dept. Agr. Farmers' Bui. 

 283, p. 13 ; April 29, 1907. 



