I live in north California, Bay Area. About 7 month ago I planted a Thompson seedless grape tree. Recently its leaves start to turn yellow, beginning with yellow spots all over the leaves, and then the whole leaves turn yellow. Old leaves were affected first and now it has spread to the entire grapevine. Can someone help me save it? Thanks!,

Btw, about 5 month ago, in April, it developed some fungus - leaves turn fuzzy white gray and then dark and die. I sprayed copper fungicide and it was very effective. This time it didn't seem to help.