Myzocallis coryli
In 3 days ~10% in a week ~20%
Myzocallis coryli, commonly known as the hazel aphid, is an aphid in the genus Myzocallis found in the United States and Europe. This species has recently been seen in Tasmania, as a recent introduction, with the first record being in 2019.
This species is whiteish green when young, turning light yellow green when mature. this species has almost nonexistent siphunculi, which under a microscope are cone shaped. These aphids also have sparse hairs covering their bodies.
Some adults are lighter in coloration and have a set of subtle black lines on their wings. Good close up images are a must for photography and identification of this species in Europe, though the aphid's host plant and its light coloration is an easy way to distinguish in the United States from other aphid species.
This species only uses Corylus genus plants as their host. In the woods, they use beaked hazelnuts. In agricultural settings they can, and will, use Corylus avellana and related species as their host plants. Ornamental trees are also used.
In Oregon, these aphids are major pests to hazelnut farming. Heavy infestations will cause... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Seattle | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Hazel Aphid sighting in Seattle on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 264th most-seen of the 428 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 Hazel Aphid in Seattle on a given day, against under 5% in July to May, the lowest months. That is one of Seattle's driest months, with about 50 mm of rain against 190 mm in November.
Only Seattle, in our data
Seattle is the only city on Wallace's Line with enough records to rate Hazel Aphid sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Hazel Aphid is recorded against all the insects logged in Seattle (12 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.
