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Old 08-16-2017, 09:28 PM
J-Mech J-Mech is offline
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Join Date: Apr 2013
Location: Oblong, Illinois
Posts: 17,594
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2-4-D won't touch crabgrass. It's a grass, not a broadleaf. 2-4-D is a broadleaf killer.

Interseed the yard, with minimal till. Something like an plug aerator will work. There are special planters that are made to interseed grass in existing sod. You might be able to rent one. They have a disrupter bar that can be run at an angle, so it tears up some of the top layer of soil, then has a drop seeder above them, and a tamper on the back. (I just think the seeder is cool is why I brought it up, and because I want you to know there are tools for interseeding grass in existing sod.)

Depending on what type of grass you have, you may be mowing it too short also. Crabgrass isn't a perennial. It's an annual, so it goes to seed, and dies in the fall. Best way to stop it is to get the soil condition where crabgrass doesn't like it. Crabgrass likes acidic soils. Most likely, you need AG lime on your lawn.

Here is some more reading for you if you want:

https://www1.maine.gov/dacf/php/gotp...ss-cornell.pdf

http://extension.illinois.edu/lawnta...home_lawns.cfm
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