A very large psyllid, 5 - 6 mm, associated with Alder.    The adults are green, but may become red-brown later in the year. The wings are clear, wth dark veins. The nymphs are covered in a white waxy secretion.

Baopelma foersteri is also associated with Alder, but has pale wing veins.

host

Good quality photographs clearly showing wing venation; note host plant

On Alder.

Late spring and summer.

Associated with Alder.

Common (ref.: British Bugs website; link below)

Frequent

https://www.britishbugs.org.uk/homoptera/Psylloidea/Psylla_alni.html