This year we found this weed in a hay field I have had rented for several years. It is growing in a circle about 30' across. Not knowing what it was I disc mowed around it and bush hogged it later.
Anyone got any idea?

It is pretty eaten up in the second picture. There were lots of shinny blue/green beetles having lunch.
Anyone got any idea?


It is pretty eaten up in the second picture. There were lots of shinny blue/green beetles having lunch.
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