Brevicoryne brassicae
In 3 days ~10% in a week ~20%
Brevicoryne brassicae, commonly known as the cabbage aphid or cabbage aphis, is a destructive aphid (plant louse) native to Europe that is now found in many other areas of the world. The aphids feed on many varieties of produce, including cabbage, broccoli (especially), Brussels sprouts, cauliflower and many other members of the genus Brassica, but do not feed on plants outside of the family Brassicaceae. The insects entirely avoid plants other than those of Brassicaceae; even though thousands may be eating broccoli near strawberries, the strawberries will be left untouched.
Cabbage aphids, from the genus Brevicoryne of the family Aphididae, are grayish-green, but a waxy covering gives them a grayish-white to powdery blue appearance. Cabbage aphids produce a myrosinase (beta-thioglucoside glucohydrolase) enzyme in head and thoracic muscles; the aphids also uptake glucosinolates, particularly sinigrin, from the plants on which they feed, storing the glucosinolates in their haemolymph. (Glucosinolates are natural defenses for plants in the order Brassicales against pests and herbivores.) The combination of the glucosinolates and the myrosinase enzyme... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Berlin | 🇩🇪 Germany | |
| 2 | Auckland | 🇳🇿 New Zealand | |
| 3 | London | 🇬🇧 United Kingdom | |
| 4 | San Diego | 🇺🇸 United States | |
| 5 | San Francisco | 🇺🇸 United States | |
| 6 | Los Angeles | 🇺🇸 United States | |
| 7 | Melbourne | 🇦🇺 Australia | |
| 8 | New York City | 🇺🇸 United States | |
| 9 | Seattle | 🇺🇸 United States | |
| 10 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Cabbage Aphid sighting in Auckland on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 574th most-seen of the 689 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.
April
In that month about 10% of wildlife watchers report a Cabbage Aphid in Auckland on a given day, against under 5% in May to March, the lowest months.
Among the best
Of the 10 cities where we can rate Cabbage Aphid sightings, Auckland ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Berlin (Germany, under 5%).
Same family: Aphididae
The closest relatives of the Cabbage Aphid that you can see in Auckland (family Aphididae, Aphids) are Oleander Aphid (about 10%), Giant Willow Aphid (about 10%) and Hairy-Tailed Fig Aphid (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Cabbage Aphid is recorded against all the insects logged in Auckland (6 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.
