Season (Adult / Immature):
National Status: Nb
Local Status: Rare and very local resident.
Local Record: Grade 4 See here for explanation
Flight time: Late Mar-early Jun.
|Year first recorded||1885||1988||1885|
|Year last recorded||2011||1988||2011|
|Number of records||41||1||84|
|Number of individuals||116||1||234|
For the region, we have a total of 84 records from 40 sites. Earliest record on file is in 1885.
For further information refer UK Moths.
Davey, P., 2009: A local species restricted to southern England, the larva feeding on oak (Quercus spp.). In Dorset, the moth is very local and tends to colonise old oak woods; current sites include: Powerstock Common, Deadmoor Common, Melcombe Park, Oakers Wood, Arne Wood, and historical sites include Wootton Wood and Chamberlaynes. Reduction in old oak and birch woodland to make way for conifer plantation has undoubtedly reduced the number of colonies across the county. Managing a varied age structure of oak could be beneficial to maintaining this species at the above oak woodland sites. Singletons trapped at West Bexington and St Ives well away from potential core habitat, suggest occasional dispersal.
The following account is of a moth flying during the day at Corfe Castle on 24 April 1893: "Heat still intense. Max. shade temperature 67°F. Hurrah for Purbeck! While walking through our Corfe River copse this evening I noticed a small Geometer flying about under an oak tree. It presently settled on a leaf of sallow, and I stood lost in admiration for it proved to be a magnificent specimen of E.irriguata which is quite new to the Purbeck list though I have always rather expected that it might occur here. I gazed at it for some time wondering how in the world I could catch it as it was sitting awkwardly among the leaves and I was net-less, worse luck! Finally I made an attempt to slip a box over it, but it was too wide-awake, and although I got it between my closed hands it escaped and flew off into the brushwood! 'Veni, Vidi' but I cannot truthfully add 'Vici'" (Reverend E Bankes).