See specific product labels for OMRI listing.
Sulfur has both contact and volatile activity when applied at temperatures between 68°F and 85°F. When temperatures are colder, it works as a contact product only.
Use with caution on Concord, Labrusca type, and other sulfur sensitive grape cultivars as injury can occur after bloom. Do not mix sulfur products with oil products. Avoid spraying some sulfur products within 10 days of an oil product spray. See specific product labels for details. The efficacy of sulfur may not be improved with the use of a spray adjuvant.
PHI listed is to avoid fermentation issues with field-applied sulfur.
Organic
Effect on Beneficials:
Moderately Harmful
Material Type:
Fungicide
Signal Word:
Caution
Formulation:
Spray Powder
Usage for sulfur on Grapes
Budbreak to Prebloom
| Target | Rate of application | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Powdery Mildew | 5.0-10.0 lb | 24 | 28 | M2 | Best |
Sulfur has both contact and volatile activity when applied at temperatures between 68°F and 85°F. When temperatures are colder, it works as a contact product only. When temperatures are warmer, there is risk of phytotoxicity. Use of adjuvants or multiple tank-mixing partners may increase risk of phytotoxicity on wine and juice grapes. Organic |
Bloom to Pea Size Fruit
| Target | Rate of application | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Powdery Mildew | 5.0-10.0 lb | 24 | 28 | M2 | Best |
Sulfur has both contact and volatile activity when applied at temperatures between 68°F and 85°F. When temperatures are colder, it works as a contact product only. When temperatures are warmer, there is risk of phytotoxicity. Use of adjuvants or multiple tank-mixing partners may increase risk of phytotoxicity on wine and juice grapes. Organic |
Pea Size Fruit to Véraison
| Target | Rate of application | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Powdery Mildew | 5.0-10.0 lb | 24 | 28 | M2 | Best |
Sulfur has both contact and volatile activity when applied at temperatures between 68°F and 85°F. When temperatures are colder, it works as a contact product only. When temperatures are warmer, there is risk of phytotoxicity. Use of adjuvants or multiple tank-mixing partners may increase risk of phytotoxicity on wine and juice grapes. Organic |