My zucchini plants produced beautifully for the first part of the season,...
My zucchini plants produced beautifully for the first part of the season, then just withered and died all at once.
Greene County Ohio
Your description of problem is a bit too general for a single diagnosis. The following links may be helpful for matching to your specific symptoms:
The Penn State Extension and the University of Minnesota Extension have overviews that may be of help:
More information on bacterial wilt: http://u.osu.edu/vegetablediseasefacts/cucurbit-diseases/bacterial-wilt/
Once a specific diagnosis is made, control measures may be recommended.
I hope this is helpful.