Tiafenacil (Gamma)
WSSA Group 14: protoporphyrinogen oxidase (PPO) inhibitor
A non-selective contact herbicide used for broadleaf and grass weed control.
Gamma herbicide can be applied alone or in tankmix with other burndown herbicides, e.g., glufosinate, glyphosate. It works well on young (less than 5 inch) annual weeds, and can suppress some perennial weeds by desiccating green foliage. It needs an adjuvant (methylated seed oil, MSO, preferred) to have optimum burndown activity. It can be applied at 0.5 to 1.5 oz per acre at 2 week intervals during the season. Do not apply more than 4.5 oz per acre per year.
No weed species are 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 tiafenacil on Grapes
Sucker Management
| Target | Rate of application | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Sucker Management | 0.5-1.5 oz | 12 | - | 14 | Provides sucker control when suckers are less than 6 inches long. Must add adjuvant for optimum results. Apply only to vines older than 2 years. |
Post-Emergence (Weeds)
| Target | Rate of application | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Annual Broadleaf Weeds | 0.5-1.5 oz | 12 | - | 14 | Do not apply to vines established less than 2 years unless protected by nonporous wraps, grow tubes, or waxed containers. | |
| Annual Grasses | 0.5-1.5 oz | 12 | - | 14 | Do not apply to vines established less than 2 years unless protected by nonporous wraps, grow tubes, or waxed containers. | |
| Biennial and Perennial Broadleaf Weeds | 0.5-1.5 oz | 12 | - | 14 | Do not apply to vines established less than 2 years unless protected by nonporous wraps, grow tubes, or waxed containers. |