Chrysoteuchia topiarius
In 3 days ~20% in a week ~40%
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.
With luck
About 10% of wildlife watchers report a Topiary Grass-Veneer sighting in Edmonton on a given day, based on 36 verified sightings from GBIF citizen-science data. It is the 69th most-seen of the 390 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June to August
In those months about 10% of wildlife watchers report a Topiary Grass-Veneer in Edmonton on a given day, against under 5% in September to May, the lowest months. Those are among Edmonton's wettest months, with about 80 mm of rain a month against 20 mm in February.
Yes
Of the 11 cities where we can rate Topiary Grass-Veneer sightings, Edmonton has the highest daily chance: about 10%. Next come 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 Edmonton (36 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.
