The symptoms, general concensus of opinion here, the possible method transport, and the general location from whence it came points right at aminopyralid. I understand a product named Forefront, which is popular for hay fields, may also contain 2,4D. It is surmised it came in a 2010 hay cutting. This is incidious, that a product could be created by the chemists they must have known would be terminal to farms dependant on imported manure for their nutrients. All small farms here, at least ones I know with an occasional exception, have to import. We turned half the garden, fallow at the time (not now!), to a herd of 16 goats with the intent of making our own manure. The problem was my garden was in dire need or organic material, a large injection, as it were. All these years I had resisted import, did it twice, and got bit. Without dirt replacement, which is about as traumatic to a garden one can get (thinking about when I started with sand on top of peat and added bags and bags of various mineral nutrients). That's 1/2 an acre! Of course I was in my 40's then with lots of energy. All had to be hauled in by tractor bucket, one by one. Slowing down a bit these days, don't know if I have the energy to move 100 yds. Taking the day off today, I am runout, tired, exhausted from all this. Dirt replacment, similar to realizing a wooden boat needs to be refastened, did that last summer. Jim