Archips crataegana
In 3 days ~10% in a week ~20%
Archips crataegana, the brown oak tortrix, is a moth of the family Tortricidae. It is found in most of Europe east to Japan. The wingspan is about 20 mm for males and about 25 mm for females. Adults are sexually dimorphic. The forewings have a sinuate termen There is an irregular vertical, costal fold from the base to 2/3 and light brown or ochreous-brown There is a transverse dorsal spot near the base. The central fascia has the anterior edge angulated below middle. The costal patch is extended as a streak to the termen above the tornus. It is dark ochreous-brown. The fascia is attenuated and sometimes obsolete towards costa. The hindwings are grey, the apex in female sometimes yellowish. Julius von Kennel provides a full description.
They are on wing from June to August. The larvae feed on various deciduous trees, including Quercus, Ulmus, Fraxinus and Salix species. They feed in a tightly-rolled leaf. The species overwinters as an egg. Wikipedia →
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Rare
Under 5% of wildlife watchers report a Brown Oak Tortrix sighting in London on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 1300th most-seen of the 1504 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Brown Oak Tortrix in London on a given day, so our monthly data shows no clear season.
Among the best
Of the 4 cities where we can rate Brown Oak Tortrix sightings, London ranks 4th at under 5%, level with the leaders once rounded. The best odds are in Moscow (Russia, under 5%), Vienna (Austria, under 5%) and Paris (France, under 5%).
Same genus: Archips
The closest relatives of the Brown Oak Tortrix that you can see in London (genus Archips) are Large Fruit-Tree Tortrix (about 10%) and Variegated Golden Tortrix (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown Oak Tortrix is recorded against all the insects logged in London (7 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
