Enargia decolor
In 3 days ~10% in a week ~30%
The pale enargia or aspen twoleaf tier (Enargia decolor) is a moth of the family Noctuidae. It has a boreal-transcontinental distribution, occurring across the Canadian boreal plain and then southward through the western cordillera at higher elevations, where it is presumably limited by the availability of trembling aspen and possibly other poplars. Records range from northernmost British Columbia and south-western Northwest Territories east to New Brunswick. It has also been reported from Nova Scotia, Ohio and New York. In the western United States it is known from western Montana, Idaho, Washington, Oregon, Nevada, Utah, Wyoming (Albany and Carbon counties), western Colorado, New Mexico (Grant Co.), and Arizona (Graham Co.). There are no records from the Rocky Mountain front ranges of Colorado, where it would be expected to be widespread if there is a continuous distribution southward into New Mexico and Arizona. The populations from west of the Rocky Mountains south to New Mexico and Arizona may represent a distinct species.
The wingspan is 30–40 mm. Adults are on wing from late July to early September with most records after mid-August. Larvae have been recorded on Betula papyrifera, Populus balsamifera, Salix species, Populus grandidentata and Alnus rugosa, but can reach population levels high enough to cause extensive defoliation of Populus tremuloides stands in boreal forests. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Elk Island National Park | 🇨🇦 Canada |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report an Aspen Twoleaf Tier Moth sighting in Edmonton on a given day, based on 19 verified sightings from GBIF citizen-science data. It is the 139th 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 30%, if each day is a fresh chance.
August and September
In those months about 10% of wildlife watchers report an Aspen Twoleaf Tier Moth in Edmonton on a given day, against under 5% in October to July, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Aspen Twoleaf Tier Moth sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 2 cities where we can rate Aspen Twoleaf Tier Moth sightings, Edmonton has the highest daily chance: under 5%. Next come Calgary (Canada, under 5%).
Same family: Noctuidae
The closest relatives of the Aspen Twoleaf Tier Moth that you can see in Edmonton (family Noctuidae, Cutworm Moths and Allies) are American Copper Underwing (about 10%), Alfalfa Looper (about 10%) and Bicolored Sallow (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Aspen Twoleaf Tier Moth is recorded against all the insects logged in Edmonton (19 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.
