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in Problem solving
Our grapevine is well over ten years old, its planted just outside the greenhouse but it grows inside the greenhouse. well after some really hot weather some of the leafs have got brown patchs and some grapes have shrivelled up.Tthe green house is well ventilated and its well pruned so whats gone wrong???
This sounds like grape shanking. There is a good page about grape shanking on the RHS website.