Crabgrass (Digitaria sanquinalis) Crabgrass is the major annual weed infesting many home lawns. It is an annual weed germinating in April, setting seed in August and dying with the first frost of fall. Crabgrass has tremendous survival reproductive capabilities. A few crabgrass plants in your lawn are acceptable. The most effective way to control crabgrass is to create a dense, healthy turf. Pre-emergence herbicides prevent emergence of crabgrass plants in the spring. These products must be applied prior to crabgrass germination that could occur as early as April 1st. Post-emergence herbicides control crabgrass after it has emerged. These products are most effective on small crabgrass. It is better to simply tolerate the crabgrass until it dies with the first frost. However, it can be killed by spot-spraying the vinegar-based herbicides. The Agralawn Crabgrass control product is also effective.
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