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Postemergence herbicides target visible weeds. They are used primarily against broadleaf weeds, perennial grasses, and sedges. The chemicals 2-4d, dicamba and mecoprop are broadleaf herbicides. They have been combined in many products that control many broadleaf weeds. Look for herbicides with these active ingredients.
When choosing an herbicide, make sure that it will control the weed and that it is recommended for your turf. Before using, read the entire label and follow it precisely. The following tips will help you achieve optimum control in the spring or fall when air temperatures are between 65 and 85 degrees F. In hotter temperatures, turf damage is more likely.
At the time of treatment, soil moisture should be adequate. When turf is drought stressed, weed control is poor and turf damage is more likely.
Mow a couple of days before or a couple of days after application. Mowing lessens the amount of surface area that the herbicide contacts.
Treat weeds when no rain is expected for at least 24 hours.
If it is windy, wait to apply herbicides of any kind. They can and will injure ornamental plants. Best results occur when weeds are young.
For acceptable control, repeat applications, 10-14 days apart, may be required.
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