Courgette Leaf

Hi
Have a very healthy and strong growing courgette plant but one of the leaves has gone a bit yucky...any ideas

 

Hi Always

I'm no expert, but mine tend to do that as well, generally it happens to one or several of the leaves lower down the stem and the newer ones are proper green. My squash do the same.
Not sure if there is a definite answer as a search on the internet brings up all sorts of answers (someone more knowledgeable will come along soon I'm sure to give a better answer) but one cause can be lack of nutrients, when it happens early on I generally give mine some weak tomato feed, seems to sort them out.

Good luck with those
GG

 

Leaf miner or sun scorch possibly, nothing to worry about, as GG says they're always making new ones

 

I get it on mine too!