Nematus ribesii
In 3 days ~10% in a week ~20%
Nematus ribesii is a species of sawfly in the family Tenthredinidae. English names include common gooseberry sawfly and imported currantworm. This insect is best known as a pest of gooseberries. The larvae feed on the foliage of the plant, often defoliating it completely.
Like all sawflies, this species is a hymenopteran, not a true fly. This insect can produce three generations per year, with larvae emerging between April and September. It differs in this respect from Nematus leucotrochus, the pale-spotted gooseberry sawfly, which has a single generation. The female sawfly lays eggs on the undersides of the leaves and the larvae work their way upwards, stripping the plant of foliage. The larva of this species of sawfly is up to 2 centimeters long and green in color with a black head and black spots along the body. The adult is yellowish with black markings, the females slightly larger than the males. 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 an Imported Currantworm sighting in Edmonton on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 336th most-seen of the 390 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 an Imported Currantworm in Edmonton on a given day, against under 5% in July to May, the lowest months. That is one of Edmonton's wettest months, with about 85 mm of rain against 20 mm in February.
3rd of 4
Of the 4 cities where we can rate Imported Currantworm sightings, Edmonton ranks 3rd at under 5%. The best odds are in Anchorage (United States, about 10%) and Portland (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Imported Currantworm is recorded against all the insects logged in Edmonton (5 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.
