So quickly the peas turned sad

I'm not quite sure how this happened.  The other day when I came home to abundant English peas, I saw some dying vines toward the back, but I assumed it was just survival of the fittest.  A few days later the whole lot seems to be suffering.  The lower leaves have a white powdery substance on them.  My first diagnosis with the help of the internet is powdery mildew.  It looks like powdery mildew should look.  In a cursory search for the possible sins I could've committed to make this happen,  I came up with not enough fertilizer, not enough mulch, and too much watering.  It's probably been a bout 9 weeks since my last fertilizer round, I did not mulch this bed, and  I could very well be over-watering with my automatic soaker hose, but the ground doesn't feel saturated.   Thanks to the soaker hoses though, I know I'm not having problems with water splashing fungus up onto the leaves.  I've got a call into my parents at Maas Nursery to see what they suggest -- rolling over or somehow fighting back.  Meanwhile I collected the pods that aren't already shriveled and brown for what could be one last meal of peas.  And do I need to get those plants out of the yard so they don't infect anything else?