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I think it started in the dry spell, but I've slept on it and worried they'll now infect my squash as it's so bad. I'll spray with bicarb first as a less drastic measure. The fruit are actually already pretty decent but I think they're ornamental pumpkins (can't actually remember) so I was hoping they'd last until Halloween.
Polygon
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.