Tips for a Successful Fall Broadleaf Weed Strategy

A fall broadleaf weed control strategy is essential in a sports field playing surface maintenance program. The main focus of a late fall weed control application is to address winter annuals and other broadleaf varieties.

Although weed control is relatively straightforward with a herbicide program, the best way to minimize weeds is to maintain a thick and dense stand of turf by adhering to sound cultural practices.

Mowing

• Maintain turf within the recommended mowing height for that species of turf.
• Mow frequently and remove no more than 1/3 of the leaf blade during each mowing event.

Aerification

• Core aerify at least once a month with a PTO-driven aerator.
• If budget and time allow, aerify (core or solid tine) monthly.

Fertilization

• Fertilize native soil cool-season athletic fields with 3 to 4 lbs of nitrogen per 1,000 sq. ft. per year, as some weeds (clover) are indicators of low nitrogen.
• For cool-season turf, apply the majority of the fertilizer in the fall.
• For warm-season turf, apply most of the fertilizer when the turf is actively growing.

Herbicide Applications

Fall applications provide the best broadleaf weed control due to the downward translocation of carbohydrates. Broadleaf weeds are getting ready for winter and moving resources to the roots. Herbicides will go along for the ride, more greatly impacting the roots and other underground structures, thus killing the plant completely, achieving better, long-lasting control. 

Tips for Effective Herbicide Applications

• Always read and follow label directions.
• Adhere to mowing recommendations before and after applications per the label.
• Liquid applications consistently outperform granular weed control applications.
• Do not apply to drought-stressed turf.
• Consult the label before application if new seedlings are present.
• Consult the label before application if new sod is present.
• Pay close attention to overseeding windows after application.
• Apply in low wind conditions.
• Use a product containing carfentrazone in cool conditions.