Articles
Hazelnut tolerance and Italian ryegrass (Lolium perenne L. ssp. multiflorum) control with tiafenacil
Article number
1379_73
Pages
503 – 510
Language
English
Abstract
Italian ryegrass (Lolium perenne subsp. multiflorum (Lam.) Husn) has evolved resistance to multiple herbicides in hazelnut orchards of Oregon.
These resistant and multiple herbicide-resistant populations are the prevalent biotypes.
Glufosinate is the only registered herbicide that effectively controls Oregons Italian ryegrass.
However, glufosinate-resistant Italian ryegrass biotypes indicate the need for new management options as alternatives or as complements to glufosinate.
Tiafenacil is a protoporphyrinogen oxidase (PPO) inhibiting herbicide with postemergence control of broadleaves and grasses.
The objectives of this research were to evaluate tiafenacil for Italian ryegrass control and hazelnut tolerance.
A field study was initiated in 2021 in an orchard infested with Italian ryegrass near Canby, OR. Tiafenacil at 50, 75, or 150 g a.i. ha‑1 provided the greatest weed biomass reduction, 62, 67, and 79%, respectively, and percent ground cover, 9, 7, and 6%, respectively, compared to 48 g m‑2 and 77% ground cover in the non-treated control.
Weed biomass reduction and ground cover with tiafenacil (50, 75, or 150 g a.i. ha‑1) were similar to glufosinate (1,150 g a.i. ha‑1), and the combinations of tiafenacil (50 g a.i. ha‑1) with clethodim (135 g a.i. ha‑1), 2,4D (1,060 g a.i. ha‑1), glufosinate, and tolpyralate (40 g a.i. ha‑1). Tiafenacil plus clethodim and tiafenacil plus glufosinate provided the greatest Italian ryegrass control.
Initial results of two multi-year studies initiated in 2022 indicate that multiple applications of tiafenacil up to 200 g a.i. ha‑1 do not injure hazelnut.
Tiafenacil is a promising and effective alternative to glufosinate for Italian ryegrass control and can help with resistance management as no PPO resistance has been documented in the western US. This research is ongoing to document hazelnut tolerance and support future registration of tiafenacil.
These resistant and multiple herbicide-resistant populations are the prevalent biotypes.
Glufosinate is the only registered herbicide that effectively controls Oregons Italian ryegrass.
However, glufosinate-resistant Italian ryegrass biotypes indicate the need for new management options as alternatives or as complements to glufosinate.
Tiafenacil is a protoporphyrinogen oxidase (PPO) inhibiting herbicide with postemergence control of broadleaves and grasses.
The objectives of this research were to evaluate tiafenacil for Italian ryegrass control and hazelnut tolerance.
A field study was initiated in 2021 in an orchard infested with Italian ryegrass near Canby, OR. Tiafenacil at 50, 75, or 150 g a.i. ha‑1 provided the greatest weed biomass reduction, 62, 67, and 79%, respectively, and percent ground cover, 9, 7, and 6%, respectively, compared to 48 g m‑2 and 77% ground cover in the non-treated control.
Weed biomass reduction and ground cover with tiafenacil (50, 75, or 150 g a.i. ha‑1) were similar to glufosinate (1,150 g a.i. ha‑1), and the combinations of tiafenacil (50 g a.i. ha‑1) with clethodim (135 g a.i. ha‑1), 2,4D (1,060 g a.i. ha‑1), glufosinate, and tolpyralate (40 g a.i. ha‑1). Tiafenacil plus clethodim and tiafenacil plus glufosinate provided the greatest Italian ryegrass control.
Initial results of two multi-year studies initiated in 2022 indicate that multiple applications of tiafenacil up to 200 g a.i. ha‑1 do not injure hazelnut.
Tiafenacil is a promising and effective alternative to glufosinate for Italian ryegrass control and can help with resistance management as no PPO resistance has been documented in the western US. This research is ongoing to document hazelnut tolerance and support future registration of tiafenacil.
Publication
Authors
J.W.A. Miranda, M.L. Moretti
Keywords
crop safety, glutamine synthetase inhibitor, herbicide-resistant weed management, N-phenyl-imides, protoporphyrinogen oxidase inhibitors
Groups involved
Online Articles (78)