Wheat Ryegrass / Weed Management

— Written By Curtis Fountain and last updated by
To: Duplin Co. Wheat Interests

From: Curtis D. Fountain

Agricultural Extension Agent – Field Crops

Wheat Ryegrass/Weed Management

Overview

As soon as soil conditions/air temperatures allow, please manage ryegrass (if present and you have not already done so) and broadleaf weeds. For best results, herbicide applications should be made when air temperatures are above 50 degrees F and nighttime temperatures are above freezing.

Why spray now (using water as the carrier)? Note optimum ryegrass and broadleaf weed sizes for satisfactory herbicide results. Treatment while ryegrass and broadleaf weeds are small results in better herbicide performance. Treatment while the wheat is small allows for better herbicide weed coverage. The winter annuals (ryegrass and broadleaf weeds) that compete most emerged last Fall. Flat-fan nozzle sprayers will result in better weed control than flood nozzle sprayers.

Weed Identification & Management Video

Click here for a 12-minute video featuring Dr. Wes Everman, NCSU Extension Weed Specialist, and Dr. Randy Weisz, NCSU Extension Small Grains Specialist.

Annual (Italian) Ryegrass Control

Axial XL, Osprey, and PowerFlex are labeled for postemergence ryegrass control in wheat.

Axial XL – Group 1 herbicide (ACCase inhibitor)*

Ryegrass size – 1 to 5-leaf stages on main stem and prior to the 3rd tiller

Wheat size – 2-leaf to pre-boot stages

Adjuvant – not required

Rainfastness – 30 minutes

Tankmix partner – can be tankmixed with Harmony Extra SG

Osprey – Group 2 herbicide (ALS inhibitor)*

Ryegrass size – 1-leaf to 2-tiller stages

Wheat size – emergence to jointing stages

Other common grasses/weeds – also controls annual bluegrass (1-leaf to 2-tiller), wild mustard (1-2 inches), and wild radish (1-2 inches)

Adjuvant – 1) methylated seed oil (1 1/2 pints/acre) or 2) nonionic surfactant (2 quarts per 100 gallons of spray solution) and 30% UAN (1-2 quarts/acre)

Rainfastness – 4 hours

Tankmix partner – can be tankmixed with Harmony Extra SG

Rotational crop restriction – grain sorghum (10 months)

PowerFlex – Group 2 herbicide (ALS inhibitor)*

Ryegrass size – 2-leaf to 2-tiller stages

Wheat size – 3-leaf to jointing stages

Other common weeds – also controls chickweed (1-2 inches) and wild mustard (1-2 inches)

Adjuvant – nonionic surfactant (1-2 quarts per 100 gallons of spray solution)

Rainfastness – 4 hours

Tankmix partner – can be tankmixed with Harmony Extra SG

*Rotating Osprey or PowerFlex with Axial XL is a suggested ryegrass resistance management strategy.

Broadleaf Weed Control

Harmony Extra SG provides postemergence broad-spectrum broadleaf weed control.
Harmony Extra SG – Group 2 herbicide (ALS inhibitor)
Weed size – chickweed (1-4 inches), henbit (1-4 inches), wild mustard (1-4 inches), and wild radish (1-4 inches)
Wheat size – 2-leaf to just prior to visible flag leaf stages
Adjuvant – nonionic surfactant (1 quart per 100 gallons of spray solution)
Rainfastness – label reads “rainfall immediately after treatment can wash Harmony Extra SG off of weed foliage, resulting in reduced weed control”
Additional comments – For henbit, apply 0.75 – 0.9 ounce/acre. For wild radish, apply 0.6 – 0.9 ounce/acre.


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January 15 – 17
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Duplin Co. Extension Center
January 23 – 6:00 pm
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Written By

Photo of Curtis FountainCurtis FountainExtension Agent, Agriculture - Field Crops (910) 296-2143 (Office) curtis_fountain@ncsu.eduDuplin County, North Carolina
Updated on Jul 6, 2015
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