Byturus tomentosus
In 3 days ~10% in a week ~20%
The raspberry beetle (Byturus tomentosus) is a species of beetle in the fruitworm family Byturidae. It is a major pest that is widespread in north-central Europe, affecting raspberry, blackberry and loganberry plants. This species is related to the raspberry fruitworm (B. urbanus) which is native to North America.
The beetles find raspberry flowers using vision and smell and lay eggs on them, which hatch into pale brown larvae. The larvae feed on the developing fruit and cause the fruit to appear smaller and shriveled. The female adult beetles can lay up to 120 eggs. Adult beetles also feed on the leaves of the plant and its flowers. Grown beetles overwinter in the soil below their host plants.
Because the larvae are hidden in the raspberry fruit during most growing stages, natural predators do not have a large influence on the beetle population. The raspberry beetle is often controlled by use of derris, a pesticide. Although experts in ecological and organic growing no longer consider derris ecologically sound, Rotenone which is made from derris is still sold in the U.S. Some wild raspberry species are resistant against the beetle larvae.
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| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saint Petersburg | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Raspberry Beetle sighting in Saint Petersburg on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 332nd most-seen of the 448 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 Raspberry Beetle in Saint Petersburg on a given day, against under 5% in July to May, the lowest months.
Only Saint Petersburg, in our data
Saint Petersburg is the only city on Wallace's Line with enough records to rate Raspberry Beetle sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Raspberry Beetle is recorded against all the insects logged in Saint Petersburg (7 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.
