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Dithiopyr is a preemergent herbicide for crabgrass control in turf and ornamental grasses. It is effective on 45 grassy and broadleaf weeds. [1] Dithiopyr inhibits root growth of susceptible weeds as well as turf grass and thus should be used only on established turf with a well-developed root system.
Zytron, also known as DMPA, is a chlorophenoxy herbicide. [1] It controls crabgrass and other weeds in turf preëmergently, and ants, chinch bugs and grubs. [2] It is used on baseball pitches in Australia.
Quinclorac is an herbicide used primarily to control crabgrass. [1] It is found in some household herbicides for lawn use. Most [citation needed] lawn maintenance companies use the product for the control of annual grass weeds like crabgrass. Quinclorac is a synthetic auxin.
The best control requires a second application about 6–8 weeks later. This provides coverage in mid-late summer when crabgrass can still germinate. Depending on location, one rule of thumb is to apply when the local forsythia blooms are wilting. In the northeast, they need to be applied before azaleas bloom.
Proturk Goosegrass and Crabgrass Control and Anderson's Goose and Crabgrass Control both have bensulide as one of their active ingredients, along with oxadiazon at a concentration of 5.25% and 1.31% respectively. [3] Bensulide products may be used outdoors by homeowners on lawns and ornamentals, and by professional lawn care operators.
"The best time to plant grass is August to September, when there is less competition from lawn weeds and crabgrass," explains Janice Parker, a landscape architect based in Greenwich, Connecticut ...