Aphis fabae
In 3 days ~10% in a week ~30%
The black bean aphid (Aphis fabae) is a small black insect in the genus Aphis, with a broad, soft body, a member of the order Hemiptera. Other common names include blackfly, bean aphid, and beet leaf aphid. In the warmer months of the year, it is found in large numbers on the undersides of leaves and on the growing tips of host plants, including various agricultural crops and many wild and ornamental plants. Both winged and wingless forms exist, and at this time of year, they are all females. They suck sap from stems and leaves and cause distortion of the shoots, stunted plants, reduced yield, and spoiled crops. This aphid also acts as a vector for viruses that cause plant disease, and the honeydew it secretes may encourage the growth of sooty mold. It breeds profusely by live birth, but its numbers are kept in check, especially in the later part of the summer, by various predatory and parasitic insects. Ants feed on the honeydew it produces, and take active steps to remove predators. It is a widely distributed pest of agricultural crops and can be controlled by chemical or biological means. In the autumn, winged forms move to different host plants, where both males and females are produced. These mate and the females lay eggs which overwinter. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Black Bean Aphid sighting in Madrid on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 274th most-seen of the 457 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.
May and December
In those months about 10% of wildlife watchers report a Black Bean Aphid in Madrid on a given day, against under 5% in January–April and June–November, the lowest months.
Yes
Of the 2 cities where we can rate Black Bean Aphid sightings, Madrid has the highest daily chance: under 5%. Next come London (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Black Bean Aphid is recorded against all the insects logged in Madrid (10 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.
