Why post-emergent applications deter weeds

Why post-emergent applications deter weeds

Pre-emergent herbicide can stop crabgrass, but post-emergent products are a viable option, too.

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May 15, 2018
Kate Spirgen
Industry News Lawn Care
Lawn & Landscape photo illustration

Battling crabgrass is a constant struggle throughout the U.S., no matter what type of grass you’re dealing with. “It’s the weed we get the most complaints about,” says Jim Stockhardt, operations manager at Evergreen Lawn Care in Cherry Hill, New Jersey.

While a pre-emergent herbicide can stop crabgrass in its tracks, post-emergent products are a viable option as well. Warm weather and wet conditions in many parts of the country are facilitating crabgrass germination, and the rains reduce the efficacy of pre-emergent applications.

Crabgrass is particularly tricky because while freezing weather destroys a lot of weeds, crabgrass seeds will pop up again the following year without fail. While pre-emergents are the first choice for these hardy plants, heavy rains can thwart efforts. Or, your new customers may call you once they start noticing problems on their lawns. In those cases, post-emergents can save your customers’ lawns.

To find it fast, look in thinner or shorter grass areas since they warm up first, making it easier for crabgrass to take over, Stockhardt says.

Read the full story from the May issue here.