Beginning with Petal Fall, the regular program with a standard 

 scab fungicide is followed. However, in some years tree growth and 

 weather conditions are such that the regular program should be 

 started before Petal Fall. For example, tree development from Green 

 Tip to Petal Fall is usually from the third week in April to the 

 third week in May, about 4 weeks. In 1973, it was not 4 weeks but 

 6 weeks and, in some places 7 weeks; in addition, the entire month 

 of May except for a few short breaks was a continuous wetting period. 

 Growers who waited until Petal Fall did not get good scab control. 

 Obviously, a grower needs to remain alert and use judgement whether 

 to wait until Petal Fall to start the regular program or whether 

 to start it earlier. If in doubt, he can include a scab fungicide 

 in rust or powdery mildew control sprays if they are needed or in 

 insect sprays which are started before bloom. 



What to use : Difolatan 4 Flowable is the only fungicide registered 

 for the Single Application Treatment. Other scab fungicides 

 have been tested but do not give satisfactory results. Difol- 

 atan irritates eyes and skin of some people. Observe all safe- 

 ty precautions. 



When: The spray is applied on trees at Dormant to 1/4 Inch Green 

 Tip. It usually causes some crinkling of cluster leaves. If 

 applied later than 1/4 Inch Green Tip, there may be leaf in- 

 jury and fruit russet on some varieties. 



How much to apply : Five quarts in 100 gallons of dilute spray is 



applied at 400 gallons per acre of standard mature trees. This 

 is 20 quarts or 5 gallons of fungicide per acre. 



Concentrate sprays at 3X or 4X may be used provided the same 

 amount of fungicide is deposited on the buds, twigs and branches 

 as with 400 gallons of dilute spray. The full amount, 20 

 quarts or 5 gallons per acre is needed if it is to protect long 

 enough. Do not reduce by 20 to 2S% to compensate for no run- 

 off or drip as is done in concentrate spraying in regular pro- 

 grams. Growers who cut the dosage in concentrate sprays in 

 1973 had disappointing scab control. In order for SAT to work, 

 the maximum amount of fungicide has to be applied to buds, 

 twigs and branches. 



Some adjustment in number of gallons applied per acre may be 

 necessary because of tree size and spacing. High density plantings 

 .with narrow rows may require as much as mature standard trees. Non- 

 bearing or small trees with wide row spacing probably need less. 

 What is important, is that enough gallons are used to provide an 

 adequate deposit of fungicide on buds, twigs and branches. 



