Nothing here is label direction — the label is the law. These are notes from other applicators, moderated before they appear. Check the labeling accompanying the product and applicable state requirements.
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Promalin is a plant growth regulator used on apples, non-bearing pears, and non-bearing sweet cherries to manage fruit development. Its active ingredient is Gibberellins A.A. at 1.8% w/w. The product is designed to improve the shape of apples through fruit elongation and to increase the size and weight of fruit on most varieties. It also helps increase lateral bud break and shoot growth, providing a better tree framework for early cropping. For pears, it can be used to increase fruit set after a frost. Application involves spray coverage to ensure all parts of the plant receive the directed amount. When applying, ensure sufficient water is used to ensure thorough coverage without excessive runoff. Users should avoid application during freezing temperatures or when temperatures are below freezing at 90°F. It is important to note that rainfall or irrigation within 6 hours after application can reduce effectiveness. For pest control technicians, note that this is a growth regulator, not a pesticide for pest control, and requires specific PPE including long-sleeved shirts, long pants, waterproof gloves, and shoe plus socks.
| Location | Rate | Label notes |
|---|---|---|
| Outdoor | Not specified for general use | Used to improve apple shape, increase fruit size/weight, and increase lateral bud break/shoot growth. |
| For pests | Location | Per | Finished strength | Label notes |
|---|---|---|---|---|
| Apples (Nursery and Orchard) | Outdoor | 3,500 - 7,500 ppm | 0.2-0.33 pints (3.2-5.3 fl oz) per pint of latex per mille | Apply in the spring when terminal buds are about to swell before shoots emerge. |
| Non-bearing Sweet Cherries (Orchard only) | Outdoor | per mille parts per million. | ||
| Pears | Outdoor | 6-16 ounces | 0.5-1 pints | To increase fruit set; apply without frost beginning at flowering and between flower and petal fall. Case specific: apply between pink bud and petal fall within 24 hours. |