Saissetia oleae
In 3 days ~10% in a week ~20%
Saissetia oleae (syn. Coccus oleae) is a scale insect in the family Coccidae. It is considered one of the three main phytophagous parasites of the olive tree (Olea europaea), together with the olive fruit fly (Bactrocera oleae) and the olive moth (Prays oleae). Although it is a common parasite which occurs most often in olive trees, it is a polyphagous species, also attacking (but less frequently) citrus trees as well as various ornamental shrubs such as oleanders, pittosporums, sago palm, and euonymus.
One of the first scientists who studied the insect in a scientific and modern way was Italian naturalist Giuseppe Maria Giovene. He wrote a publication entitled Descrizione e storia della cocciniglia dell'ulivo (1807) in which he answered Giovanni Presta who had denied the existence of the insect in the Apulian provinces of Bari and Otranto. Giovene showed that the insect was common in the above regions as well, even though it occurred less often. Moreover, Giovene discovered the male of the insect, which at that time wasn't known in Europe. In the Dictionary of Natural History of Paris (1816) (French: Nouveau dictionnaire d'histoire naturelle, appliquée aux arts, à l'agriculture... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Auckland | 🇳🇿 New Zealand | |
| 2 | Buenos Aires | 🇦🇷 Argentina | |
| 3 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Black Olive Scale sighting in Buenos Aires on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 515th most-seen of the 558 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Black Olive Scale in Buenos Aires on a given day, so our monthly data shows no clear season.
Among the best
Of the 3 cities where we can rate Black Olive Scale sightings, Buenos Aires ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Auckland (New Zealand, under 5%).
GBIF citizen-science records
It is estimated from how often the Black Olive Scale is recorded against all the insects logged in Buenos Aires (5 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.
