Graphocephala fennahi
In 3 days ~20% in a week ~30%
Graphocephala fennahi (rhododendron leafhopper) is a species of leafhopper native to the United States. Its common name derives from it feeding on the sap of rhododendrons. The species was introduced to Great Britain in the 1930s and continental Europe in the 1970s. They possibly contribute to the spread of the rhododendron fungus (Pycnostysanus azaleae) through Europe.
Adults possess green wings with purple tips which each feature two orange stripes. Their heads, undersides and legs are yellow, and they have a purple stripe across the top of their heads, extending over the eyes. Males are 7.4-8.8 mm (about 0.35 in) long, and females are a little larger, around 8.2–9 mm (about 0.35 in). Nymphs are light yellow and wingless.
They move by jumping or, as adults, flying short distances. When disturbed, they quickly jump away. Skin sheds of the leafhopper can be found on the underside of leaves. They are related to cicadas, spittlebugs, and treehoppers. They feed on the sap from rhododendron plants by sucking it out with a proboscis.
They are recorded in grassy lands, brushy habitats, and mixed hardwood forests, usually found in areas with rhododendron... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 3 | Acadia National Park | 🇺🇸 United States | |
| 4 | Shenandoah National Park | 🇺🇸 United States | |
| 5 | Wadden Sea National Park | 🇩🇪 Germany |
With luck
About 10% of wildlife watchers report a Rhododendron Leafhopper sighting in Portland on a given day, based on 55 verified sightings from GBIF citizen-science data. It is the 110th most-seen of the 507 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
June to October
In those months about 10% of wildlife watchers report a Rhododendron Leafhopper in Portland on a given day, against under 5% in November to May, the lowest months. Those are among Portland's driest months, with about 55 mm of rain a month against 250 mm in December.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Rhododendron Leafhopper sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 23 cities where we can rate Rhododendron Leafhopper sightings, Portland ranks 8th at about 10%, level with the leaders once rounded. The best odds are in Hamburg (Germany, about 10%), Berlin (Germany, about 10%) and Vancouver (Canada, about 10%).
GBIF citizen-science records
It is estimated from how often the Rhododendron Leafhopper is recorded against all the insects logged in Portland (55 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.
