Broadleaf weeds and specific herbicide recommendations are too numerous to try to list here. There are dozens of trade names for broadleaf herbicides that are labeled for both warm and cool-season turfgrass lawns. Remember to scout the lawn to determine which weeds are present so the correct herbicide can be chosen. The majority of these herbicides belong to only four chemical families; 1) phenoxy 2) benzoic acid 3) pyridine 4) triazolinone. Phenoxy herbicides consisting of 2,4-D, mecoprop and dichlorprop have been labeled since the 1960’s and 70’s. Dicamba is a benzoic acid herbicide that has been labeled many years as well. In the 1980’s and 90’s, pyridine herbicides consisting of triclopyr, cloypyralid and fluroxypyr were registered. Triazolinone herbicides consisting of carfentrazone and sulfentrazone were registered in the 2000’s. In many cases, these chemistries are combined to form 2, 3 and even 4-way herbicides. Because of the wide spectrum of broadleaf weeds that are usually present in any given lawn, package mixes are the surest way to controlling all species that may be present with one application. This is why there are so many broadleaf herbicides to choose from.
Sulfonylurea herbicides such as Monument and Manor can also be used exclusively for broadleaf weed control. Monument is an excellent annual bluegrass herbicide and is actually a very good broadleaf herbicide as well. Many broadleaf weeds are controlled with rate a of 0.33 oz/A. Manor applied at 0.33 to 0.5 oz/A controls even more broadleaf weed species than Monument. Both herbicides are tolerant to bermudagrass and zoysiagrass, with Manor also tolerant to centipedegrass (up to 0.5 oz/A), St. Augustinegrass, Kentucky bluegrass and fine fescue. These herbicides can be tankmixed and applied to bermudagrass and zoysiagrass to create an outstanding broadleaf herbicide treatment.
Leon Warren and Dr. Fred Yelverton