[sarah44]

Hello All, hope your all doing well on the growing this year.
I have a problem this year,have been growing brassicas for 2 years now, and rotating them on the plot, I am unable to find this problem in my book.
The leaves have white tunnels on the top and the underside shows small whitish looking maggots, that appear to be burrowing in-between the leaf towards the stem..Also infecting the Peas... I read about the Pea Thrips, but my book never explained it very well.
Does anyone know? 
I have removed the leaves that have been attacked from the cabbages, but it's a bit awkward doing the Peas.
Would Crop Saver be a good treatment.

[Ice]

It looks like leaf miner to me.  Have a google for treatment as I'm not sure.

[sarah44]

Yes, thankyou Ice, you were correct.. leaf miners it is. I googled and found plenty of info .This PDF explains quite well.. if anyone is interested.

which.co.uk/documents/pdf/leaf-miners-153737.pdf