Pandemis corylana
In 3 days ~10% in a week ~20%
Pandemis corylana, the chequered fruit-tree tortrix, hazel tortrix moth, filbert tortricid or barred fruit tree moth, is a moth of the family Tortricidae. It is found from northern and central Europe to Siberia, Korea and Japan.
The wingspan is 18–24 mm. It is similar to other Pandemis and Choristoneura species, but it is much paler in colour and the forewing markings are barely darker than the rest of the wing. The head and thorax are pale yellowish brown. The base colour of the forewing is pale yellowish brown with a marked brown mesh pattern. The wings, as in the related species, have marked basal blotches, an oblique cross-band in the middle and a triangular spot at the tip. These marks are barely darker than the surrounding parts, but are marked by brown edges. The hindwings are light grey and relatively narrow.
Adults are on wing from July to August in western Europe. In Korea, adults are on wing from early June to the end of September. The larvae feed on the leaves of various deciduous trees and shrubs, including Corylus, Fraxinus, Prunus, Quercus, Rubus, Swida sanguinea, Betula, Fagus, Larix, Pinus, Rhamnus frangula, Thelycrania sanguinea and Vaccinium. Larvae can be found from May to July. Pupation occurs in the larval habitation.
It is an occasional pest of cultivated nut and fruit trees. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | Birmingham | 🇬🇧 United Kingdom | |
| 3 | London | 🇬🇧 United Kingdom | |
| 4 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Chequered Fruit-Tree Tortrix sighting in Moscow on a given day, based on 16 verified sightings from GBIF citizen-science data. It is the 506th most-seen of the 1111 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.
August
In that month about 10% of wildlife watchers report a Chequered Fruit-Tree Tortrix in Moscow on a given day, against under 5% in September to July, the lowest months.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Chequered Fruit-Tree Tortrix sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
4th of 4
Of the 4 cities where we can rate Chequered Fruit-Tree Tortrix sightings, Moscow ranks 4th at under 5%. The best odds are in Liverpool (United Kingdom, about 20%), Birmingham (United Kingdom, about 10%) and London (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Chequered Fruit-Tree Tortrix is recorded against all the insects logged in Moscow (16 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.
