Rhagoletis cerasi
In 3 days ~10% in a week ~20%
Rhagoletis cerasi (the cherry fruit fly or European cherry fruit fly) is a species of fruit fly in the family Tephritidae. This species is widespread in most of Europe, except British Islands, in western Siberia to Caucasus, in Kazakhstan, Central Asia and Altai. It was first detected in North America in 2016.
Rhagoletis cerasi can reach a body length of about 3.5–5 mm (0.14–0.20 in). These small fruit flies have a shiny body, dark brown, almost black. Mesonotum shows silvery vittae. The wings are transparent, with four transverse dark stripes. Eyes are green with reddish reflections. The head is brown, while scutellum and the legs are yellow.
This species is very similar to Rhagoletis berberidis. The adults can be found from late May to early July. They feed on the sugary secretions produced by the cherry itself or by insects (such as the aphid honeydew). After 10–15 days the females lay 50-80 eggs one at a time in the pulp of the fruit. After 6–12 days the eggs hatch and white legless larvae 4–6 mm long come out and feed on the pulp of the fruit. During the ripening the larvae leave the fruit and pupate in the soil, where they overwinter... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Cherry Fruit Fly sighting in Toronto on a given day, based on 26 verified sightings from GBIF citizen-science data. It is the 557th most-seen of the 1689 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.
June
In that month about 10% of wildlife watchers report a Cherry Fruit Fly in Toronto on a given day, against under 5% in July to May, the lowest months.
Among the best
Of the 4 cities where we can rate Cherry Fruit Fly sightings, Toronto ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Berlin (Germany, under 5%).
GBIF citizen-science records
It is estimated from how often the Cherry Fruit Fly is recorded against all the insects logged in Toronto (26 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.
