methusala wrote:

If its a powdery white spot then its a common fungus to cucumber type
plants and not fatal.

Happily, I don't think it is any more.

As long as it doesnt get really bad and the leaves fall off. It wont
effect the fruit except for the loss of shade from missing leaves. However
if it gets worse there are chemical sprays available I however use a milk
solution, 9 parts water to 1 part milk and spray the plant. Works a treat.

That's good to know - thanks for the tip.

Improving greenhouse ventilation helps prevent recurrences.

These are outside, so ventilation shouldn't be a problem at least.

Regards,

Peter