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Some Reasons for Poor Results with SAT 



1. Insufficient deposit because: 



(a) Sprayer inadequate - does not deposit enough fungicide 

 in the tree, especially the tops, from where the fungi- 

 cide redistributes to growth below. 



(b) Nozzle size and arrangement not good. Spray pattern 

 does not give proper coverage, 



(c) Sprayer not calibrated - Some growers do not know how 

 much material the sprayer is applying per acre and some 

 do not know how big an acre is. 



(d) Sprayer speed too fast - especially with concentrate 

 spray. 



(e) Spray dosage in tank reduced for concentrate spray - 

 a common mistake. 



2. Unfavorable weather conditions when SAT spray is applied. 



(a) Too windy - Gusts of wind deflect spray as sprayer 

 passes tree. No spray is deposited either in entire 

 trees or in some parts of trees, especially the tops. 



(b) Rain when SAT spray is being applied or before it dries 

 on the tree. Too much washes off so that what is left 

 is not enough to redistribute in later rains to pro- 

 tect new growth. 



(c) Frequent and heavy rains wash away dried spray deposit 

 so there is not enough to protect up to petal fall and 

 grower does not start regular scab protection soon 

 enough. 



3. Tree development longer than 4 weeks from Green Tip to Petal 

 Fall. 



Don't expect SAT to protect more than 4 weeks under normal 

 weather conditions. May need to start regular scab program 

 in Pink. 



4. SAT is a one-spray program. Inadequate deposit or misses 

 cannot be corrected by following sprays, as with the regu- 

 lar multi-spray program, because there are no following 

 sprays for several weeks. 



Difolatan and oil mixture may cause serious leaf injury and 

 fruit russet. This should not be a problem, because Green Tip is 

 too early to start insect control with oil. 



Adapting SAT to Insect Control Programs that Start in Tight Cluster 

 or Pink 



Some growers start insect control in Tight Cluster or Pink, at 

 which time they are able to include scab fungicides in the insect 

 sprays. Such growers may want SAT scab protection up to the time 

 they start spraying for insects which would be two or three weeks 

 after Green Tip. Dr. M. Szkolnik of the Geneva, New York Experiment 

 Station has had some success in programming the SAT application to 



