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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Rare
Under 5% of wildlife watchers report an Imported Currantworm sighting in Portland on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 308th most-seen of the 507 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.
May
In that month about 10% of wildlife watchers report an Imported Currantworm in Portland on a given day, against under 5% in June to April, the lowest months.
2nd of 4
Of the 4 cities where we can rate Imported Currantworm sightings, Portland ranks 2nd at under 5%. The best odds are in Anchorage (United States, about 10%).
Same order: Hymenoptera
The closest relatives of the Imported Currantworm that you can see in Portland (order Hymenoptera, Ants, Bees, Wasps, and Sawflies) are Black-Tailed Bumble Bee (about 20%), European Paper Wasp (about 20%) and Yellow-Faced Bumble Bee (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Imported Currantworm is recorded against all the insects logged in Portland (12 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.
