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Weeds galore #341508

Asked July 10, 2016, 6:34 PM EDT

I have some weeds in my field that are very resistant to Roundup. I have included pictures hoping you can help identify them and recommend the right weed killer. These weeds are taking over everything. Thank you for your help. Regards, Diann Paarmann

Carroll County Maryland

Expert Response

Looks like you may have round up resistance building up. I am not 100% sure, but it looks as if you have Marestail weed, which is notorious for developing resistance to herbicide.
Please see:
https://extension.umd.edu/sites/default/files/_docs/programs/ipmnet/Marestail-UMD%20IPMnet.pdf
 https://www.btny.purdue.edu/WeedScience/marestail/ID-323%20HorseWeed.pdf

An Ask Extension Expert Replied July 12, 2016, 8:18 AM EDT

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