Answer: Grapevines are prone to a number of disease and insect problems so you'll have to do a little detective work to find the cause. If the vine completely dried out, check the crown of the plant near the soil surface for outward clues of insects, or injury (perhaps cracking and splitting, lawn mower or weed whacker damage). If it appears intact and free of problems, then consider root injury - from nematodes, drought, soggy soil, or other stressful condition. For now, cut back the dead vines and remove the debris from the garden. Cut all the way back to the woody parts of the plant. Then cross your fingers and hope for new buds on the remaining woody canes next spring.
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