Blair's shoulder-knot

This moth was not recorded in Ceredigion before the 1980's according to Adrian Fowles. It was first discovered on the Isle of Wight in 1951 and has been moving north very quickly since then. Could the spread be related to abundance of Lawson's and Leyland Cypress, the larval food plants. We recorded good numbers in the garden last year, and we had our first for this year last night.