picked fruit. A more complete analysis includes thirteen spray programs and their 

 costs per acre, per tree, and per bushel. If you would like to receive this added 

 information please send a card to the Editor. 



In this analysis it is assumed that the cost of phenyl mercury sprays for 

 eradication, or the sulfur dusts necessary during prolonged rainy periods would be 

 a constant amount to add to each program. 



The quality of fruit produced v«-ith the aid of these different fungicidal 

 sprays must also be considered in trying to determineiAhich material is most economi- 

 cal. Some materials ma,y provide superior control, thus allowing a decrease in a 

 nuiTiber of applications. Obviously this would favor the superior materials with less 

 cost than shewn in Table II, However, little tjuantitative information is available 

 on relative effectiveness of these materials under field conditions 4 The ability 

 of the farm operator in timing and adequate spray applications perhaps more greatly 

 influences the success in obtaining a clean crop than the material used. 



TABLE II 



Variation in Cost of Fungicidal Spray Programs 

 (l300 30-year old Mcintosh trees on UW acres) 



1/ Prices used are average prices for four leading companies in 1953. 



2/ Crag or ferbam or captan may be chosen by the apple grower to be used for tliese 



four reduced strength summer sprays, 

 3/ 1/2 S indicates half strength, 



-Ronald 0, Aines 



Laboratory AssL s tan t 

 Farm Management Depti» 



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