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Crabgrass germinates when soil temperatures reach 55 degrees F for a few days. Depending on the temperatures in your area, you may see crabgrass as early as March in some years, says Waltz.
Crabgrass loves the heat, so it doesn’t start popping up until soil surfaces warm up. When soil temperatures remain around 55 degrees for a few days, baby crabgrass plants start appearing.
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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 If they are applied too late, the key enzyme inhibited is no longer active.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.
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.
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.