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Crabgrass is a tough, unruly weed that quickly can take over a lawn. Turfgrass experts explain how to kill crabgrass and stop it from growing back.
To prevent growth of crabgrass, preemergent herbicides must be applied at a critical time. If they are applied to the soil too early, they get washed too deep into the soil or washed away by rainwater. If they are applied too late, the key enzyme inhibited is no longer active. The best control requires a second application about 6–8 weeks later.
2,4-Dichlorophenoxyacetic acid is an organic compound with the chemical formula Cl 2 C 6 H 3 OCH 2 CO 2 H.It is usually referred to by its ISO common name 2,4-D. [4] It is a systemic herbicide that kills most broadleaf weeds by causing uncontrolled growth, but most grasses such as cereals, lawn turf, and grassland are relatively unaffected.
The overall Roundup line of products represented about half of Monsanto's yearly revenue in 2009. [3] The product is marketed to consumers by Scotts Miracle-Gro Company . [ 4 ] In the late-2010s other non-glyphosate containing herbicides were also sold under the Roundup brand.
Dicamba is a selective and systemic herbicide that kills annual and perennial broadleaf weeds. [10] Its primary commercial applications are weed control for grain crops and turf areas. It is also used to control brush and bracken in pastures, as well as controlling legumes and cacti .
It is often used in combination with other chemically related herbicides such as 2,4-D, dicamba, and MCPA, which mimic the plant hormone IAA (auxin) and kill most broadleaf weeds by causing uncontrolled growth. The United States Environmental Protection Agency has classified mecoprop as toxicity class III - slightly toxic. [4]
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