Drosophila suzukii
In 3 days ~10% in a week ~20%
Drosophila suzukii, commonly called the spotted wing drosophila or SWD, is a fruit fly. D. suzukii, originally from southeast Asia, is becoming a major pest species in America and Europe because it infests fruit early during the ripening stage, in contrast with other Drosophila species that infest only rotting fruit.
Native to east Asia, D. suzukii was first described in 1931 by Shōnen Matsumura, it was observed in Japan as early as 1916 by T. Kanzawa. D. suzukii is a fruit crop pest and is a serious economic threat to soft summer fruit, i.e., cherries, blueberries, raspberries, blackberries, peaches, nectarines, apricots, grapes, and others. Research investigating the specific threat D. suzukii poses to these fruit is ongoing.
Like other members of the Drosophilidae, D. suzukii is small, approximately 2 to 3.5 millimetres (5⁄64 to 9⁄64 in) in length and 5 to 6.5 millimetres (13⁄64 to 1⁄4 in) in wingspan and looks like its fruit and vinegar fly relatives. Its body is yellow to brown with darker bands on the abdomen and it has red eyes. The male has a distinct dark spot near the tip of each wing; females do not have the spotted wing. The foreleg of the male sports dark... Wikipedia →
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Spotted-Winged Drosophila sighting in Toronto on a given day, based on 24 verified sightings from GBIF citizen-science data. It is the 612th 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.
November
In that month about 10% of wildlife watchers report a Spotted-Winged Drosophila in Toronto on a given day, against under 5% in December to October, the lowest months.
7th of 14
Of the 14 cities where we can rate Spotted-Winged Drosophila sightings, Toronto ranks 7th at under 5%. The best odds are in London (United Kingdom, about 10%), Berlin (Germany, under 5%) and Washington (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Spotted-Winged Drosophila is recorded against all the insects logged in Toronto (24 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.
