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Psyllopsis discrepans Cottony Ash Psyllid
Family: Psyllidae

Psyllopsis species all feed on Ash, and have a broadly similar colouring, needing some care to separate them.

P. discepans has less intense forewing markings than P. fraxini, but in a similar pattern. The abdomen is often greenish, although the dorsum of the thorax is typically bold yellow and black.

Common on Ash (Fraxinus spp.) across Britain, but more so in the north.

Adult: June to October
Length 3-4 mm
 Psyllopsis distinguenda
Adult female: Huddersfield (June 2008) ©Joe Botting
Psyllopsis discrepans Psyllopsis discrepans
Adult: south London (November 2007) ©Joe Botting
 Adult female: Huddersfield (June 2008) ©Joe Botting