Amphicerus bicaudatus
In 3 days ~10% in a week ~20%
Amphicerus bicaudatus, known generally as the apple twig borer or grape cane borer, is a species of horned powder-post beetle in the family Bostrichidae. It is a pest of cultivated orchard trees as well as grapes and other tree species.
Adults are long and cylindrical, about 6 to 13 millimeters long. Color can range from reddish brown to black. Larvae are white with a brown head and mandibles, about 10 millimeters long. Allen et al., 1991 finds some periodicity and some chaos in its population dynamics while Allen et al., 1993 finds only periodicity and quasiperiodicity. Both examine the interaction of beetle, insecticide, cane removal, and the grapevine host. The 1991 model shows some chaotic solutions while 1993 never does.
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| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report an Apple Twig Borer sighting in Dallas on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 1136th most-seen of the 1412 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.
February
In that month about 10% of wildlife watchers report an Apple Twig Borer in Dallas on a given day, against under 5% in March to January, the lowest months.
Among the best
Of the 2 cities where we can rate Apple Twig Borer sightings, Dallas ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Austin (United States, under 5%).
Same family: Bostrichidae
The closest relatives of the Apple Twig Borer that you can see in Dallas (family Bostrichidae, Auger Beetles) are Red-Shouldered Bostrichid (about 10%) and Two-Horned Powder-Post Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Apple Twig Borer is recorded against all the insects logged in Dallas (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.
