CaroVail · EPA Reg 62097-41-82917 · Plant Growth Regulator
Document last checked 2026-05-30
According to the label From the product label
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Kudos 27.5 WDG is a plant growth regulator used to manage vegetative growth in various crops, including alfalfa (inter-seeded in corn), apples, grass grown for seed, peanuts, pears, and sweet cherries. The active ingredient is prohexadione-calcium at 27.5%. It works by inhibiting the biosynthesis of gibberellins to reduce shoot growth, which can help manage canopy development, improve light penetration, and reduce the incidence of fire blight in certain crops like apples. Application methods vary by crop, including ground application, aerial application, and orchard sprayers. For apples, it can be used for early season fire blight reduction, growth reduction on medium to high vigor trees, and canopy shaping. For grass grown for seed, it is used to shorten internode length to improve pollination and seed yield. Users should note that mixing with Ammonium Sulfate (AMS) can improve performance, but mixing with calcium can reduce efficacy. It is not for use in California. Always follow specific rate and timing instructions for each crop type to avoid phytotoxicity or reduced efficacy.
Areas treatable (4)
Alfalfa inter-seeded in cornApplesGrass grown for seedPeanuts
How to treat each type of area 4
Alfalfa inter-seeded in corn
| Location |
Rate |
Unit |
Label notes |
| Outdoor |
29 oz or less |
oz per acre |
Do not apply to crops under stress due to lack of moisture, hail, flooding, or mechanical injury. |
Apples
| Location |
Rate |
Unit |
Label notes |
| Outdoor |
variable |
lbs. ai per acre |
Used for various purposes: early season fire blight reduction, growth reduction, and canopy shaping. |
Grass grown for seed
| Location |
Rate |
Unit |
Label notes |
| Outdoor |
14-29 oz |
oz per acre |
Used to suppress vegetative growth and shorten internode length. |
Peanuts
| Location |
Rate |
Unit |
Label notes |
| Outdoor |
7.25 oz |
oz per acre |
Apply at 50% row closure; a second application at 100% row closure may be required. |
Mixing instructions 1
| Amount |
Per |
Label notes |
| 1 pound |
per pound of Kudos 27.5 WDG |
Add one pound of spray grade ammonium sulfate (AMS) for every pound of Kudos 27.5 WDG for consistent performance. |
Worker safety
Re-entry interval (REI)
12
PPE required
Long-sleeved shirt and long pants, shoes plus socks, and chemical resistant gloves made of any waterproof material polyethylene or polyvinyl chloride.
Timing & weather
- Avoid application during temperature inversions.
- Avoid application during windy conditions.
Use restrictions 8
- Not for use in California.
- Do not apply to crops under stress (moisture, hail, flooding, mechanical injury).
- Do not apply through any type of irrigation system.
- Do not use to formulate or reformulate other pesticide products.
- For alfalfa: Do not apply more than 29 oz (0.5 lbs. ai/A) per acre per year.
- For alfalfa: Do not harvest corn silage for 50 days following last application.
- For apples: Do not apply more than 36 oz (0.62 lbs. ai) per acre per application.
- For grass: Do not apply more than 29 oz (0.50 lbs. ai) per acre per application.