Selective and non-selective herbicide options for golf course management

By Dean Mosdell, Ph.D., technical services manager for Syngenta

A weed can be defined simply as a plant growing where it’s not wanted. An agronomic view would add that weeds compete for water, light and space with desirable plants, and can harbor diseases and insects. But to your customers, weeds diminish the aesthetic value of the golf course.

Importance of preemergent control

A weed control plan for golf courses should include a pre-emergent program featuring a product such as a Barricade® brand herbicide to prevent development of weed seedlings. This is particularly important for grass weed control, as there are few options for selective post-emergent grass control. Depending on turf type, Tenacity® and Manuscript® herbicides have pre- and/or post-emergent activity on certain grass weeds, such as crabgrass, on turf. However, in landscape areas, woody and herbaceous plants can be sensitive to post-emergent herbicide applications.


Post-emergent control

The most common post-emergent weed control practice in and around landscape areas (and edging) is applying a non-selective herbicide as a direct spray to prevent contact with desirable plants. As turf managers evaluate herbicides for edging and control of weeds, Reward® herbicide offers fast burn down of grass and dicot weeds without concern of staining concrete, volatility and movement from the application site.

Reward is a contact, non-selective herbicide that disrupts photosynthesis, causing degradation of cell walls. Desiccation of green plant tissue can be seen within hours of application, burning all the foliage it contacts. Reward can be applied as a broadcast spray or in a backpack sprayer for spot treatment applications at 0.75 oz. per gallon. All applications will need a non-ionic surfactant to enhance plant surface coverage. Other uses include weed control in joints and edges of hard surfaces around landscape areas, winter weed control in dormant turf and burn-down of existing bermudagrass turf prior to overseeding with ryegrass for winter color.

Fusilade® II Turf and Ornamental herbicide is a selective, systemic herbicide that inhibits the fatty acid synthesis that is required for the growth of new weeds. Because of this mode of action, grass weed control may take two to three weeks, although the plant will stop growing within a week after application. Fusilade II is a grass herbicide that is safe to use around ornamental plants. The spot treatment rate for Fusilade II in landscape areas, fence lines and non-turf areas is 0.75 oz. per gallon. Poa annua and fine fescue are naturally tolerant to Fusilade II.

Non-selective Weed Control Options

A tank-mix of Fusilade II (0.75 oz. per gal.) and Reward (0.38 oz. per gal.) with a dicot herbicide containing dicamba, triclopyr or halauxifen will enhance control of perennial grass weeds such as bermudagrass, bentgrass, quackgrass, plus dicot weeds. This can be an alternative to glyphosate for non-selective weed control.

Selecting a herbicide

Use sites

Use sites

Product
Trim and edge
Landscape area
Renovation
Dormant turf
Non-crop IVM
Reward
Y
Y
Y*
Y
Y
Fusilade II
Y
Y
Y
N
Y
Reward + Fusilade II + Dicot Herbicide
Y
N
Y
N
Y
 

Always consult the product label for complete use and application information

Reward
Benefits: quick burndown of all vegetation (visual effects within 24- 36 hours). Short reseeding interval, aquatic weed control
Note: regrowth of perennial plants; limited tank-mixture partner
Fusilade II
Benefits: control of grasses such as bermudagrass; safe around ornamental dicot plants
Note: no Poa annua activity; reseeding > 14 days; slow acting; limited tank-mixture partners
Reward + Fusilade + Dicot herbicide
Benefits: quick burndown of all vegetation. Control of most perennial grasses and dicot weeds. Glyphosate alternative.

For more information, contact your local Syngenta Territory Manager.

*Will not kill perennial plants

© 2022 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties and/or may have state-specific use requirements. Please check with your local extension service to ensure registration and proper use. Barricade®, Fusilade®, Manuscript®, Reward®, Tenacity® and the Syngenta logo are trademarks of a Syngenta Group Company.

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