Hypsopygia costalis
In 3 days ~10% in a week ~20%
Hypsopygia costalis, the gold triangle or clover hay moth, is a species of moth of the family Pyralidae. It was described by Johan Christian Fabricius in 1775 and is found in Europe. The wingspan is 16–23 mm.The forewings are purple, sometimes blackish-sprinkled; median part of costa dotted with yellow; lines yellow, nearly straight, forming large spots on costa; a terminal line and cilia yellow. Hindwings as forewings, but lines much
nearer together, irregularly curved, not forming costal spots. The adult moths fly from May to July, depending on the location. The supposed species H. aurotaenialis is included here pending further study. The caterpillars feed on dry vegetable matter. They have been found in haystacks or thatching, as well as in chicken (Gallus) and magpie (Pica) nests. The caterpillar is injurious to clover hay, and to other hay when mixed with clover. Its depredations can be prevented by keeping the hay dry and well ventilated, as the insect preferably breeds in moist or matted material such as is to be found in the lower parts of haystacks, where affected hay becomes filled with webbings of the caterpillars and their excrement, rendering it unfit for feeding. A treatment is to burn the webbed material and to thoroughly clean the affected location. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Pyrénées National Park | 🇫🇷 France | |
| 3 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
Rare
Under 5% of wildlife watchers report a Clover Hayworm Moth sighting in Portland on a given day, based on 18 verified sightings from GBIF citizen-science data. It is the 242nd most-seen of the 507 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.
July and September
In those months about 10% of wildlife watchers report a Clover Hayworm Moth in Portland on a given day, against under 5% in August and October–June, the lowest months. Those are among Portland's driest months, with about 35 mm of rain a month against 250 mm in December.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Clover Hayworm Moth sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
13th of 15
Of the 15 cities where we can rate Clover Hayworm Moth sightings, Portland ranks 13th at under 5%. The best odds are in Budapest (Hungary, about 10%), Kyiv (Ukraine, about 10%) and Essen (Germany, about 10%).
Same family: Pyralidae
The closest relatives of the Clover Hayworm Moth that you can see in Portland (family Pyralidae, Pyralid Snout Moths) are Meal Moth (about 10%) and Indian-Meal Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Clover Hayworm Moth is recorded against all the insects logged in Portland (18 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.
