Napropamide (Devrinol 2-XT, DF-XT)
WSSA Group 0: inhibits very long chain fatty acid synthesis
A pre-emergence herbicide for the control of some annual grasses and broadleaf weeds. Will not give complete control of nightshade, flixweed, tansy mustard, tumble mustard, or perennial weeds.
Apply fall through spring before weeds germinate. May be applied to both newly planted and established vineyards. Applications made from November 1 to February 15 should be incorporated with irrigation or shallow cultivation if rainfall does not occur within 2 weeks of treatment. Performance is reduced if excessive residue occurs on the soil surface. Applications made during the spring should be activated with sufficient water to wet the soil to a depth of 2 to 4 inches within 24 hours. Can be used safely in sprinkler-irrigated vineyards. The pre-harvest interval is 70 days. Do not apply more than 4 lbs of active ingredient per acre per crop cycle.
At least one weed species resistant to this mode of action documented to occur in ID, OR, or WA; data from Heap, I.
The International Survey of Herbicide Resistant Weeds. Available at www.weedscience.org
Usage for napropamide on Grapes
Pre-Emergence (Weeds)
| Target | Rate of application | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Annual Broadleaf Weeds | 2 gal | 24 | 70 | 15 | For newly planted and established vineyards. Do not allow contact with grape foliage. Soil surface debris can limit efficacy. Must be applied with sufficient water to push product 4-8 inches into the soil. | |
| Annual Grasses | 2.0 gal | 24 | 70 | 15 | "Devrinol 2-XT application". For newly planted and established vineyards. |