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https://ask.extension.org/questions/460235
Hi Deb, you can try these
How to Remove Yarrow Killing Yarrow without Chemicals It’s much nicer to use the term yarrow control but the goal is the same — to eliminate yarrow plants. Digging and hoeing areas where yarrow has spread can remove some of the rhizomes but mechanical control is only effective if it goes down 12 inches and removes every speck of yarrow weed. Providing superior care to the lawn will make it thick and prevent some of the spread of the pest. Chemical Yarrow Control There are several chemicals available for killing yarrow. They must be used during the period of growth from spring to autumn. Dicamba, chlorsulfuron, clopyralid, MCPA, triclopyr and 2,4D are all listed as useful for yarrow control by the University of Illinois. Yarrow will require several treatments over the growing season, so it’s best to define the problem early and apply controls as soon as possible. Remember to follow all precautions listed by the chemical manufacturer.
Read more at Gardening Know How: Yarrow Control: Tips To Remove Yarrow https://www.gardeningknowhow.com/edible/herbs/yarrow/eliminate-yarrow.htm
Hi Deb, sorry you are having problem with yarrow growing in your lawn. I read this article and hope it has the right answer for you. Good luck How to Get Rid of Yarrow | Home Guides | SF Gate
Yarrow (Achillea millefolium), often considered an unwanted weed, ... digging easier and herbicides are more effective when weeds are not under drought stress. ... Non-selective herbicide will injure or killany plants it comes into contact with, so only ... on grassy vegetation, making them more appropriate for use on lawns.
http://articles.latimes.com/1992-12-20/realestate/re-4398_1_yarrow-lawn DID YOU KNOW Yarrow an Herb contains Sesquiterpene which is natural bug repellent for mosquitos,fleas & ticks.