Some of my pumpkins have yellow vines and leaves. Any suggestions? I live in Washington so they are planted in clay soil. I dug holes 2-3 feet wide and filled them with a manure, compost and potting soil mix and have given them organic fertilizer....did I overdo it with the fertilizer? It's been a cold and rainy year...powdery mildew? Some of them are okay and others are completely yellow and the little pumpkins fall off the vine.

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