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I have just read all the posts, some going back a few years, and everyone no matter from which country be it the US or France, Luxemburg or italy has the same story of dying wisteria, maybe its a worldwide problem, maybe its a new disease or insect, i wish someone could give us some answers.
Most wisterias are cultivars grafted onto a rootstock. One of the tutors on my RHS course advised me that these grafts can suddenly start to fail even on mature plants. As the graft fails you will start to see the symptoms many of you have described and suckers growing from the base are also a sign that the graft may be failing.
Unfortunately there isn't anything you can do to cure the problem. If you get fresh growth from the base of the plant this should grow healthily but remember it won't be the same variety as your original plant. It should be vigorous but may not have the same flowering properties (colour, scent etc).
Our huge (20x40 feet), rampant, thriving, prolifically flowering wisteria, that has been in situ against a south facing house wall in very sandy, poor soil for eight very successful years has suddenly wilted, shrivelled and dropped all its leaves. Help! I've tried barrel loads of water to no avail and I can find no signs of bugs or pests. What can we do?