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Chemicals for Apple Thinning

Timing Chemical Trade Name Rate per 100 gal
dilute TRV
REI (HOURS)
Bloom Naphthaleneacetic acid-sodium Fruitone-L, PoMaxa, Refine 3.5 WSG, Refine 3.5L 2-4 oz 48
  ATS (ammonium thiosulfate)*   2 to 4 gal.  
  Lime sulfur (calcium polysulfide)* Lime Sulfur Solution

4 to 10 gal (alone)

2 gal )with oil)

48
Petal fall Naphthaleneacedtamide Amid-Thin W 4-8 oz  48
  Naphthaleneacetic acid-sodium Fruitone-L, PoMaxa, Refine 3.5 WSG, Refine 3.5L 2-4 oz 48
  Carbaryl Sevin XLR Plus, Sevin 4F 0.5 to 1.5 pt 12
  6-Benzyl Adenine (6-BA) Maxcel, RiteWay 48-200 oz 12
 

6-Benzyl Adenine (6-BA)

Exilis 9.5SC

Exilis Plus

9.6 to 25.6 fl oz

see label

12
8-13 mm Fruit Size Naphthaleneacetic acid-sodium Fruitone-L, Pomaxa, Refine 3.5 WSG, Refine 3.5L 2-6 oz 48
  Carbaryl Sevin XLR Plus, Sevin 4F 0.5 to 1.5 pt 12
  6-Benzyl Adenine (6-BA) Maxcel, RiteWay 48-200 oz 12
  6-Benzyl Adenine (6-BA) Exilis plus, Exilis 9.5SC 6.4 to 25.6 fl oz 12
  S-Abscisic Acid (ABA) Protone® 6.6 to 33.1 oz 4
15-20 mm Fruit Size Ethephon Ethrel 1 to 1.5 pt 48
  Carbaryl Sevin XLR Plus, Sevin 4F 0.5 to 1.5 pt 12
  S-Abscisic Acid (ABA) Protone® 6.6 to 33.1 oz 4
VT and CT only ACC Accede® (apple and peach only) 23 to 46 fl oz 12

* not registered for chemical thinning in New England