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RECJMMEMIIAnjNS FOR APPLE SCAB CONTROL - 19^5 



Apple scab can be controlled satisfactorily on a protective schedule with 

 the modern fungicides. In such a program, the fungicide must be applied thoroughly 

 before each rain which is long enough for infection to take place or during such a 

 rain before infection has taken place. 



However, there are times when it is not possible to apply a f\ingicide before 

 an infection rain or, if the fungicide was applied on time, it was v/ ashed off by 

 prolonged and heavy rain so that green tissues are no longer protected toward the 

 end of the infection period. Fortunately, there are fungicides and combinations of 

 fungicides which have the ability - called "kickback" - to inactivate the scab 

 organism in the early stages of infection, A knowledge of the fungicides which 

 have "kickback" and the length of time after the beginning of an infection period 

 that such action is effective can be used to advantage in controlling scab. 



Finally, if scab has not been prevented or stopped, and scab spots appear 

 on the apple leaves, the grower still has a chance. It is a drastic measure and 

 consists of using a powerful chemical to eradicate or "bum out" the scab spots, 

 Becaiose of the element of risk grovrers are urged to make a conscientious effort 

 to control scab by protection and use of "kickback" fungicides so that there will 

 be no need for eradication. 



There are three basic protective schedules to choose from with variations 

 for "kickback". All of them will give satisfactory scab control is used properly. 



Basic Ferbam^ulfur Schedule 



In: this program, Ferbam 3 A Ih. is combined with Sulfur at half strength. 

 No sulfur is used in 2nd Cover or later and Ferbam is reduced to 1 lb, heire or in 

 3rd Cover if there is good primary scab or if the weather is dry. Combinations are 

 at he If strength each. 



Delayed Dormant 

 Up-To-Pink 



Pre Rain 



In Rain 



Post Rain 



Basic 

 DiseSse Control 



Ferbam 1-1/2 lbs. 



Variations 



Neutral Copper Fungicides 

 (gO^)-l lb,; 25^2 lbs. 



Ferbam plus Sulfur 

 Ferbam plus Sulfur 



Ferbam 1-1/2 lbs, 



Dichlone plus Ferb, or Sulf , 

 cr Dichl«ne or Sulfur dust 

 . Dichlone l/2 Ib.j Dichlone 



plus Ferb, or Su3f .; Ferb. 



plus phenyl mercury, 



