Q What odd colour leaves do courgettes sometimes have?

A White or sometimes almost silvery smooth-surfaced patches of discolouration on perfectly good,
healthy and green leaves often cause unnecessary concern. Many varieties of courgette and marrow have this appearance and it is perfectly normal and nothing to worry about as it is
just a varietal characteristic. Yellow-fruited varieties may also produce yellow leaves and again are nothing to worry about.

Caption: Yellow leaves aren't necessarily a problem for courgette plants

Q What can I do with affected plants?

A Nothing needs to be done.

Q How can I prevent courgettes leaves having odd colours?

A No action is necessary. Fortunately it's not powdery mildew or virus.

Caption: Powdery mildew tends to occur in late summer and early autumn