Chrysoteuchia topiarius
In 3 days ~10% in a week ~20%
Chrysoteuchia topiarius, the topiary grass-veneer moth, subterranean sod webworm or cranberry girdler, is a moth of the family Crambidae. The species was first described by Philipp Christoph Zeller in 1866. It is found in most of North America.
The wingspan is 17–20 mm. Adults are on wing from late June to early August in one generation per year. The larvae feed on a wide range of plant, including mostly grasses. As larvae, they also feed at the base of cranberry vines, which results in irregular brown and dead patches, thus giving it the name the cranberry girdler. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Topiary Grass-Veneer sighting in Vancouver on a given day, based on 29 verified sightings from GBIF citizen-science data. It is the 187th most-seen of the 482 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 and July
In those months about 10% of wildlife watchers report a Topiary Grass-Veneer in Vancouver on a given day, against under 5% in August to May, the lowest months. Those are among Vancouver's driest months, with about 35 mm of rain a month against 210 mm in November.
7th of 11
Of the 11 cities where we can rate Topiary Grass-Veneer sightings, Vancouver ranks 7th at under 5%. The best odds are in Edmonton (Canada, about 10%), Portland (United States, about 10%) and Montreal (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Topiary Grass-Veneer is recorded against all the insects logged in Vancouver (29 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.
