Saperda candida
In 3 days ~10% in a week ~20%
Saperda candida, the roundheaded appletree borer, is a species of beetle in the family Cerambycidae. It was described by Johan Christian Fabricius in 1787. It is known from Canada and the United States. It contains the varietas Saperda candida var. bipunctata.
Saperda candida is preyed upon by the parasitoid wasp species Cenocoelius saperdae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Montreal | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Round-Headed Apple Tree Borer sighting in Montreal on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 694th most-seen of the 926 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Round-Headed Apple Tree Borer in Montreal on a given day, so our monthly data shows no clear season.
Between 4 and 7 pm
Across all the parks we cover, that three-hour window holds the most Round-Headed Apple Tree Borer sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Montreal, in our data
Montreal is the only city on Wallace's Line with enough records to rate Round-Headed Apple Tree Borer sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Round-Headed Apple Tree Borer is recorded against all the insects logged in Montreal (7 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.
