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News & Press: OTF News

Broadleaf Weed Control

Monday, May 18, 2015  
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Written by David Gardner, Ph.D.
The Ohio State University

There are many broadleaf weed species in turfgrass. But the ones that are most noticeable now are dandelion and white clover. Dandelion is, of course, easy to identify at this time of year because of the all too familiar yellow flowers and white puffballs. Dandelion is a perennial, thus best control is actually achieved with an application of an ester formulation of a herbicide containing 2,4-D, MCPA, or triclopyr in the fall. Control at this time of year is best with an amine formulation of the above mentioned herbicides, but be aware that you need to use caution around ornamentals when applying herbicide. Another option to consider for early next spring is the new herbicide Defendor, which if applied in March may suppress dandelion flower formation, in addition to providing good control of dandelion and clover. More information about Defendor and new herbicides may be found here:

http://www.turfmagazine.com/services/new-herbicides-for-broadleaf-weed-control/

or here

http://www.sportsfieldmanagementmagazine.com/maintenance/seed-sod/broadleaf-weed-control-update/

White clover will become more noticeable in coming weeks, particularly in areas where the turf will go dormant due to warm weather. White clover is easily distinguished from other clovers because of the white, round flower heads. White clover also can be identified by its characteristic white-colored inner band on the three leaflet leaves. White clover is a perennial, and best control is achieved with the application of a herbicide that contains either an ester formulation of MCPP (many brands) or fluroxypyr (Escalade, for example) in early November. Control at this time of year can be achieved with fluroxypyr or an amine formulation of MCPP, but you need to use caution around ornamentals when applying herbicide.

There are several newer products on the market that combine herbicides for the control of both grasses and broadleaf weeds. The best time of year to use many of these products is May to early June, while crabgrass is still young and before broadleaf weeds have hardened off due to heat/drought. Read about these products here: 

http://www.thepaginator.com/preview.php?ID=1207&pN=14


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