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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 If they are applied too late, the key enzyme inhibited is no longer active.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.
If you use a pre-emergent herbicide, you’ll need to wait to plant grass seed until 60 days after application. To lay down sod, wait 75 days. John D. Byrd, Mississippi State University, Bugwood.org
This organic spray is not for use on large areas of the lawn, though—it will kill healthy grass, too. This Green Gobbler spray comes with a 100-percent-satisfaction guarantee, so if it isn't a ...
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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 seeds germinate in the late spring and early summer and outcompete the domesticated lawn grasses, expanding outward in a circle up to 30 cm (12 in) in diameter. In the autumn when the plants die, they leave large voids in the lawn. The voids then become prime areas for the crabgrass seeds to germinate the following season.