Diabrotica undecimpunctata
In 3 days ~30% in a week ~50%
Diabrotica undecimpunctata, the spotted cucumber beetle or southern corn rootworm, is a species of cucumber beetle that is native to North America. The species can be a major agricultural pest insect in North America. Spotted cucumber beetles cause damage to crops in the larval and adult stages of their life cycle. Larvae feed on the roots of the emerging plants, which causes the most damage since the young plants are more vulnerable. In the adult stage the beetles cause damage by eating the flowers, leaves, stems, and fruits of the plant. The beetles can also spread diseases such as bacterial wilt and mosaic virus.
The three primary types of cucumber beetles are the spotted cucumber beetle, the banded cucumber beetle (Diabrotica balteata), and the striped cucumber beetle (Acalymma vittatum). In North America, the spotted and striped cucumber beetles are the most commonly encountered varieties.
The spotted cucumber beetle has three subspecies, each with a different common name: Diabrotica undecimpunctata howardi – spotted cucumber beetle or southern corn rootworm Diabrotica undecimpunctata tenella – western cucumber beetle
Diabrotica undecimpunctata undecimpunctata... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Point Pelee National Park | 🇨🇦 Canada | |
| 2 | Shenandoah National Park | 🇺🇸 United States | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 4 | Redwood National Park | 🇺🇸 United States | |
| 5 | Padre Island National Seashore | 🇺🇸 United States | |
| 6 | Yosemite National Park | 🇺🇸 United States | |
| 7 | Big Bend National Park | 🇺🇸 United States | |
| 8 | Saguaro National Park | 🇺🇸 United States | |
| 9 | Acadia National Park | 🇺🇸 United States | |
| 10 | Cumbres de Monterrey National Park | 🇲🇽 Mexico |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Dallas | 🇺🇸 United States | |
| 2 | Austin | 🇺🇸 United States | |
| 3 | Baltimore | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States | |
| 5 | Detroit | 🇺🇸 United States | |
| 6 | Portland | 🇺🇸 United States | |
| 7 | San Antonio | 🇺🇸 United States | |
| 8 | Houston | 🇺🇸 United States | |
| 9 | Philadelphia | 🇺🇸 United States | |
| 10 | San Francisco | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Spotted Cucumber Beetle sighting in San Francisco on a given day, based on 799 verified sightings from GBIF citizen-science data. It is the 30th most-seen of the 737 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
June
In that month about 20% of wildlife watchers report a Spotted Cucumber Beetle in San Francisco on a given day, against about 10% in July to May, the lowest months. That is one of San Francisco's driest months, with almost no rain against 110 mm in December.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Spotted Cucumber Beetle sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
10th of 27
Of the 27 cities where we can rate Spotted Cucumber Beetle sightings, San Francisco ranks 10th at about 10%. The best odds are in Dallas (United States, about 20%), Austin (United States, about 20%) and Baltimore (United States, about 10%).
Same family: Chrysomelidae
The closest relatives of the Spotted Cucumber Beetle that you can see in San Francisco (family Chrysomelidae, Leaf Beetles) are Bronze Beetle (about 10%) and Australian Tortoise Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Spotted Cucumber Beetle is recorded against all the insects logged in San Francisco (799 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.
