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I currently have 3 Hunter butternut squash plants in my veg plot, 2 are in a raised bed and the other is in a potato bag. The one in the bag has about 5 fruits on it, but the leaves are now going yellow and dying (I think they got powdery mildew, the same thing happened to my courgette plants), the other 2 don't have any fruit yet but the leaves are going the same way. Please can anyone shed some light on this and is there anything I can do now to save the plants? Thanks.
