Tamalia coweni
In 3 days ~10% in a week ~30%
Tamalia coweni, also known as the manzanita leaf gall aphid and the fold-gall aphid, is a species of aphid in the family Aphididae. Tamalia coweni induces galls on most species of glabrous manzanita tree. This aphid actually induces two types of galls: a midrib or margin leaf gall, and a less common inflorescence gall.
Tamalia coweni is common on the Pacific coast of North America and east to Nevada and Colorado. Tamalia inquilina, an inquiline of this species, is found in the Californias. Recently described species Tamalia glaucensis induces leaf galls on big-berry manzanita specifically. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 2 | Channel Islands National Park | 🇺🇸 United States | |
| 3 | Yosemite National Park | 🇺🇸 United States | |
| 4 | Great Bear Rainforest | 🇨🇦 Canada |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Francisco | 🇺🇸 United States | |
| 2 | Portland | 🇺🇸 United States | |
| 3 | Los Angeles | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Manzanita Leafgall Aphid sighting in San Francisco on a given day, based on 185 verified sightings from GBIF citizen-science data. It is the 105th most-seen of the 737 insects we can rate there. Over three days the chance rises to about 10%, 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 Manzanita Leafgall Aphid in San Francisco on a given day, against under 5% in November to May, the lowest months. Those are among San Francisco's driest months, with about 5 mm of rain a month against 110 mm in December.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Manzanita Leafgall Aphid sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 cities where we can rate Manzanita Leafgall Aphid sightings, San Francisco has the highest daily chance: under 5%. Next come Portland (United States, under 5%) and Los Angeles (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Manzanita Leafgall Aphid is recorded against all the insects logged in San Francisco (185 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.
