it is different walkers every time.it has aleady happened twice this year. and twice last year.they are 700-800 dollers apeace.  we have been combining peas. they seem to have a lot of koshaw weeds.  {fireweed}   and a little cadian thistle. the peas are dry. we swathed most of the peas so the weeds would be dry. and no the walkers never plug.