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 Minneapolis [Saint Paul] on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 416th most-seen of the 672 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 Minneapolis [Saint Paul] on a given day, against under 5% in July to May, the lowest months. That is one of Minneapolis [Saint Paul]'s wettest months, with about 130 mm of rain against 20 mm in January.
Among the best
Of the 5 cities where we can rate Hydrangea Leaftier Moth sightings, Minneapolis [Saint Paul] ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Montreal (Canada, under 5%) and Toronto (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Hydrangea Leaftier Moth is recorded against all the insects logged in Minneapolis [Saint Paul] (10 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.
