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Specific apple variety thinning recommendations

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ALL RATES ARE AMOUNT PER 100 GALLONS WATER DILUTE TREE ROW VOLUME (TRV)

Variety 30-80%
full bloom
Petal fall 5-6 mm
(1 week after bloom)
8-14 mm fruit size
(2-3 weeks after bloom)
Return bloom enhancement
(4-7 weeks after bloom)

Cortland

  1 to 2 pt carbaryl 1 to 2 pt carbaryl  

Delicious (spur type)

2 gal ATS 2 oz NAA plus 1 pt carbaryl 64 oz 6-BA plus 1 pt carbaryl plus 1 qt ultrafine spray oil 0.5 pt Ethrel OR 3 oz NAA (4 weekly sprays)

Delicious (non-spur type)

  1 pt carbaryl 48 oz 6-BA + 1 pt Sevin OR 2 oz Fruitone + 1 pt Sevin  
Empire   2 oz NAA + 1 pt carbaryl 64 oz 6-BA + 1 pt carbaryl OR 3 oz NAA + 1 pt carbaryl  
Fuji 2 gal ATS 64 oz 6-BA + 1 pt carbaryl 64 oz. 6-BA + 1 pt carbaryl 0.5 pt Ethrel OR 3 oz NAA (4 weekly sprays)
Gala 2 gal ATS 3 oz NAA + 1 pt carbaryl 64 oz. 6-BA + 1 pt carbaryl  
Gingergold     2 oz NAA + 1 pt carbaryl  
Golden Delicious (no Provide)   3 oz NAA + 1 pt carbaryl 64 oz. 6-BA + 1 pt carbaryl OR 6 oz NAA + 1 pt carbaryl 0.5 pt Ethrel OR 2 oz NAA (4 weekly sprays)
Golden Delicious (with Provide)   3 oz NAA + 1 pt carbaryl 48 oz. 6-BA + 1 pt carbaryl OR 4 oz NAA + 1 pt carbaryl 0.5 pt Ethrel OR 2 oz NAA (4 weekly sprays)
Granny Smith     3 oz NAA + 1 pt carbaryl  
Honeycrisp 2 gal ATS 4 oz NAA + 1 pt carbaryl 3 oz NAA + 1 pt carbaryl 3 oz NAA (4 weekly sprays)
Jonagold     3 oz NAA + 1 pt carbaryl 0.5 pt Ethrel OR 2 oz NAA (4 weekly sprays)
Lady Apple   3 oz NAA + 1 pt carbaryl 4 oz NAA + 1 pt carbaryl  
Liberty   3 oz NAA + 1 pt carbaryl 64 oz. 6-BA + 1 pt carbaryl OR 3 oz NAA + 1 pt carbaryl  
Macoun 2 gal ATS 3 oz NAA + 1 pt carbaryl 64 oz. 6-BA + 1 pt carbaryl OR 4 oz NAA + 1 pt carbaryl 3 oz NAA (4 weekly sprays)
McIntosh (non-spur type)     2 oz NAA + 1 pt carbaryl OR 36 oz 6-BA + 1 pt carbaryl  
McIntosh (spur-type)     3 oz NAA + 1 pt carbaryl OR 48 oz 6-BA + 1 pt carbaryl  
Mutsu (Crispin)     2 oz NAA + 1 pt carbaryl 0.5 pt Ethrel OR 3 oz NAA (4 weekly sprays)
Northern Spy   3 oz NAA + 1 pt carbaryl 2 oz NAA + 1 pt carbaryl 0.5 pt Ethrel OR 3 oz NAA (4 weekly sprays)
Paulared   3 oz NAA + 1 pt carbaryl 3 oz NAA + 1 pt carbaryl  

Also see: Variety Thinning Recommendations for mature trees - 8 to 12mm fruit size at Cornell Cooperative Extension, Eastern New York Commercial Horticulture