[rich24uk]

Is this downy mildew? First time growing pumpkin so I'm a bit stumped.

[Yorkie]

Looks like mosaic virus to me.

I get it every year on my courgettes etc - you're supposed to remove affected leaves and sometimes plants, but I don't tend to bother and still get crops.

Out of interest, do you smoke?

[japagow]

As the weather has been warm and wet perhaps these forms of fungus/ mildew will be unavoidable this year.

[Yorkie]

It's definitely not mildew, although I agree with your general sentiment, japagow

[mum23kids]

Downy mildew looks exactly likes it sounds: white, soft and fluffy! It is like a powdery coating a bit like someone's gone bananas with the talc.  If you get it a spray of milk and water (1:5 I think) works quite well.

Sadly the yellowing near the veins on your leaf could be the start of something nasty or could simply be a lack of nutrients. Give them a feed tomorrow and see if it improves (tomato feed will do fine).

Good luck

[mum23kids]

Actually having blown up your picture and looked at it better I'm inclined to go along with the bad news given before. It does look like the start of mosaic I'm afraid. Nutritional deficit would be a more general yellowing I think. Sorry.

[rich24uk]

I've attached some more pics. If it's mosaic virus am I best off to destroy the plant or is it worth leaving it and feeding.

Out of interest, do you smoke?

No, I don't.

[JayG]

I agree it could be mosaic virus but given that it looks as if it's being grown in isolation anyway I'd remove the worst leaf (and the dead one underneath it), feed with a tomato fertiliser and see what happens.

Wash your hands after handling the plant (plant viruses don't affect humans but can transfer to other plant hosts, although it's usually aphids which spread them around.)