Tamalia coweni
In 3 days ~30% in a week ~50%
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 |
With luck
About 10% of wildlife watchers report a Manzanita Leafgall Aphid sighting in Channel Islands National Park on a given day, based on 16 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 47th most-seen of the 131 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.
May
In that month about 20% of wildlife watchers report a Manzanita Leafgall Aphid in Channel Islands National Park on a given day, against under 5% in January–February and September–November, the lowest months. That is one of Channel Islands National Park's driest months, with almost no rain against 60 mm in January.
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.
Among the best
Of the 4 parks where we can rate Manzanita Leafgall Aphid sightings, Channel Islands National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Sequoia and Kings Canyon National Parks (United States, about 10%).
Same order: Hemiptera
The closest relatives of the Manzanita Leafgall Aphid that you can see in Channel Islands National Park (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are Mediterranean Red Bug (about 30%), California Bordered Plant Bug (about 20%) and North American Common Water Strider (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Manzanita Leafgall Aphid is recorded against all the insects logged in Channel Islands National Park (16 verified sightings from 2019 to 2026), 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.
