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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 | |
| Metamitron | Brevis® SC | 16 to 40 oz | 12 | |
| 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 | |
| 1-aminocyclopropanecarboxylic acid (ACC | Accede® SG | 6.7 to 13.4 oz | 12 |
* not registered for chemical thinning in New England