Cucumber disease

[Argonaut]

I know this is fruit really but seems most logical sub-forum.
My Greenhouse Cucumber plant (min F1 all female) has developed what looks like brown scab on many leaves …. Is this Anthracnose ? If so should I try and get some anti-fungus treatment. Assume it was the Hot Wet weather last month.
Or should I take off the good fruit and destroy it.
They are container grown (Quad Grows) so it’s not in the soil.

[burnie]

Is it on all the leaves, can you remove the worst and destroy them, does the new growth also have this problem?

[Argonaut]

The new leaves start fine ..... it the large lower leaves

[burnie]

I am removing some of the old leaves from my ridge cukes that are discolouring, there's plenty of new growth/flowers and fruits, so I don't think it harms the plants, if you remove yours I wouldn't put them in your compost, just in case yo spread the problem.

[Plot70]

It might just be scorching from sunlight.
We did get quite a bit of sun without aircraft trails in the sky.