Olethreutes ferriferana
In 3 days ~10% in a week ~20%
Olethreutes ferriferana, the hydrangea leaftier, is a species of tortricid moth in the family Tortricidae. It is native to eastern North America, from Maine to North Carolina, west to Kentucky, and Texas. The MONA or Hodges number for Olethreutes ferriferana is 2827.
Hydrangea is the host plant for this species, and caterpillars use a silk to tie developing leaves together, hence the common name. The slightly transparent green caterpillars live inside of this structure, which can superficially resemble a plant gall, because of the way it distorts the plant growth. This does not significantly damage the plant, though it may be managed for aesthetic concerns. Physical removal, rather than pesticides, are the best management technique as caterpillars are protected from pesticides inside of the leaf structure. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Montreal | 🇨🇦 Canada | |
| 2 | Toronto | 🇨🇦 Canada | |
| 3 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 4 | Boston | 🇺🇸 United States | |
| 5 | Chicago | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Hydrangea Leaftier Moth sighting in Montreal on a given day, based on 24 verified sightings from GBIF citizen-science data. It is the 322nd 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.
June
In that month about 10% of wildlife watchers report a Hydrangea Leaftier Moth in Montreal on a given day, against under 5% in July to May, the lowest months.
Yes
Of the 5 cities where we can rate Hydrangea Leaftier Moth sightings, Montreal has the highest daily chance: under 5%. Next come Toronto (Canada, under 5%) and Minneapolis [Saint Paul] (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Hydrangea Leaftier Moth is recorded against all the insects logged in Montreal (24 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.
