eliminate crabgrass - Knowledgebase Question

myerstown, Pe
Question by coryraponi
March 25, 2010
what is the best eliminator of crabgrass pre emergent and after? and is there one that will kill existing crabgrass and keep it from comming back? thakyou.


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Answer from NGA
March 25, 2010

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Crabgrass starts germinating when soil temperatures are 50 to 55 degrees F for ten or more days and germination can take place over a 6 week period. Pre-emergence herbicides provide excellent weed control for crabgrass but they last only about 30 days. The compound prevents the weed seed from germinating, but it will not kill the newly sprouted seedlings. Watch the weather - late February to early March is an ideal time to apply pre-emergence control. A second application might have to be made to keep your lawn a little more crabgrass free. At this point, you might want to try raking it out or hand pulling. Next spring use the pre-emergent again, reapplying in 30 days. That should keep the crabgrass under control. Proper lawn maintenance practices can limit crabgrass invasions. A dense stand of turfgrass prevents the weed from germinating and establishing. Fertilize at the end of May and remember that fall fertilizing, overseeding, aeration and thatch control can also limit spring problems. Scott?s Turf Builder with Halts is an example of a fertilizer with a built in pre emergence chemical designed to keep crabgrass from sprouting. Best wishes with your lawn.

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