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From: David Biggs
Dixon, IL
How do I kill crab grass or at least slow down it's growth in an existing yard without killing the grass I want to be there? I know I can use a 2-4D product to kill the broadleafs in the yard I don't want. Roundup will kill everything. What could be selective enough to kill crab grass and not desirable lawn grasses?

Extension Message
From: Greg Stack
Extension Horticulturist
Extension Web Development

The first thing you need to be sure of is it really crabgrass you are dealing with. Crabgrass is an annual grass that right now is very small and kind of chartruese green looking and low growing. There are a lot of other weed grasses that are confused with crabgrass and are perennial. The controls are different. Crabgrass is best controlled in the spring using a preemergent herbicide to control germinating seeds as crabgrass plants die offf after the first frost. While there are herbicides to control crabgrass plants it is more efficent to control it before germination. I would suggest contacting you local extension off\ice so yo can bring a sample of the grass in question for positive identification and then make the right choice of control materials.

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