Pyrrhalta viburni
In 3 days ~10% in a week ~20%
Pyrrhalta viburni is a species of leaf beetle native to Europe and Asia, commonly known as the viburnum leaf beetle. It was first detected in North America in 1947 in Ontario, Canada. However, specimens had been collected in Annapolis Royal, Nova Scotia in 1924. In 1996 it was discovered in a park in New York, where native plantings of arrowwood (Viburnum dentatum complex) were found to be heavily damaged by larval feeding. The UK-based Royal Horticultural Society stated that its members reported Pyrrhalta viburni as the "number one pest species" in 2010.
The spined soldier bug, Podisus maculiventris is used and developed as a biological control agent against the beetle. Adult viburnum leaf beetles range from 4.5-6.5 mm in size, while mature larvae are roughly between 10 and 11 mm. It has a brown head, thorax and elytra with dense golden-grey hair on its dorsal surface.
Viburnum leaf beetles go through one new generation of offspring per year. Eggs are laid throughout the summer and into October. Female beetles burrow into the underside viburnum terminal twigs and create 'spaces' in pith tissue. Then they lay eggs in clusters of 5-6 and cover them... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Paris | 🇫🇷 France | |
| 2 | Liverpool | 🇬🇧 United Kingdom | |
| 3 | Birmingham | 🇬🇧 United Kingdom | |
| 4 | Helsinki | 🇫🇮 Finland | |
| 5 | Manchester | 🇬🇧 United Kingdom | |
| 6 | London | 🇬🇧 United Kingdom | |
| 7 | Boston | 🇺🇸 United States | |
| 8 | Vienna | 🇦🇹 Austria | |
| 9 | New York City | 🇺🇸 United States | |
| 10 | Toronto | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Viburnum Leaf Beetle sighting in Vienna on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 838th most-seen of the 1406 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Viburnum Leaf Beetle in Vienna on a given day, so our monthly data shows no clear season.
8th of 16
Of the 16 cities where we can rate Viburnum Leaf Beetle sightings, Vienna ranks 8th at under 5%. The best odds are in Paris (France, about 10%), Liverpool (United Kingdom, about 10%) and Birmingham (United Kingdom, about 10%).
Same family: Chrysomelidae
The closest relatives of the Viburnum Leaf Beetle that you can see in Vienna (family Chrysomelidae, Leaf Beetles) are Colorado Potato Beetle (about 10%), Willow Clytra (about 10%) and Cassida nebulosa (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Viburnum Leaf Beetle is recorded against all the insects logged in Vienna (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.
