not fruit set in 1975; however, 

 1000 ppm did increase fruit set 



ethephon, 1000 ppm 

 in 1975 (Table 4) . 



plus Alar-85' 



Table 3. Effects of limb spreading, scoring and growth regulator 

 sprays in 1973 on bloom and fruit set on non-spur type 

 Delicious trees in 1974. 



Treatments in 1973' 



Check 



Limb spreading 



Scoring 



Alar, 1000 ppm 



Ethephon, 500 ppm 



Ethephon, 1000 ppm 



Ethephon, 500 ppm + 



Alar, 1000 ppm 

 Ethephon, 1000 ppm + 



Alar, 1000 ppm 



Blossom clusters/ 

 cm limb circ. , 1974 



■oi^ 



6ab 



5a 



4de 



2bc 



Oabc 



Fruit/ 

 cm limb circ, 



1974 



0, 

 0, 

 0, 

 0. 

 0, 

 0, 



16a 

 33a 

 89a 

 19a 

 30a 

 77a 



3.9cd 

 5 . 2abc 



0.24a 



0.84a 



2 



Scoring, limb spreading, and growth regulator treatments estab- 

 lished May 28, 1973, 13 days after full bloom. 



^Means in the same column followed by different letters are signif- 

 icantly different at the 5% level. 



Table 4. Effects of limb spreading, scoring and growth regulator 

 treatments established in 1974 on bloom and fruit set of 

 non-spur Delicious trees in 1975. 



^Growth regulator treatments applied May 28, 1974, 13 days after 

 full bloom. Scoring and limb spreading May 31, 1974. 



y^Means in the same column followed by different letters are signif- 

 icantly different at the 5% level. 



Summary 



We have shown that both mechanical and chemical techniques 

 can suppress vegetative growth of young Delicious trees. However, 



*Trade name 



