Mustard weed under mature trees - Knowledgebase Question

Name: sandy garigan
tucson, Ar
Question by sgarigan
March 25, 2009
In tucson AZ :I have bermuda grass,currently overseeded w/rye,that has been invaded by mustard weed.I have tried manually pulling them but the weeds are winning. My concern is I dont want to damage the grass,&Idont want to hurt the two 40 year old trees (china berry &desert willow)that are just coming out of dormancy & the weeds are growing under them. what can U recommend 2 treat mustard weed?


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Answer from NGA
March 25, 2009

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I'm afraid there is no easy answer to controlling the wild mustard in your lawn. The only thing that will kill it outright is a broadleaf weed killer such as one you would use on dandelions (2,4-D) but this chemical can affect nearby broadleaf plants and can harm your trees and shrubs if used over their root systems. The best approach now is to either dig it out, or spot treat individual weeds with 2,4-D, and keep your lawn mowed short. As long as you mow the weeds down before they flower and set seeds you won't have a fresh crop next spring. You can use a pre-emergent on your lawn this coming December or January (Preen Lawn Fall Weed Control) which will keep any wild mustard seeds in your lawn from sprouting. As for the rest of your landscape, hoe them down or pull them up roots and all. Wish I had another solution for you!

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