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Don’t think they grow new leaves if you cut off the old ones. I tend to just live it it. If any leaves get really bad and wilted then lop them off but it’s pretty common in pumpkins/squash/courgettes in our climate (particularly at the moment) only year I hardly got any powdery mildew was last years heatwave/drought.
Got pretty bad mildew all over my pumpkins. What do we think would happen if I just cut off all the leaves? Would they grow new ones?