Adelges abietis
In 3 days ~20% in a week ~30%
The pineapple gall adelgid (Adelges abietis) is a species of conifer-feeding insect that forms pineapple-shaped plant galls on its host species, commonly Norway and Sitka spruce. The adelgids (genus Adelges) are pear-shaped, soft-bodied green insects with long antennae, closely related to the aphid. Adelges lays up to one hundred eggs at a time, one on each needle. Adelges abietis (Linnaeus, 1758) is one of the most common species; synonyms are A. gallarum-abietis, Chermes abietis and Sacciphantes abietis.
The pineapple or pseudocone gall is a type of insect-formed gall, or abnormal outgrowth of plant tissue, that develops as a chemically induced distortion of needles, observed mostly on Norway spruce and Sitka spruce. Prominent in appearance, the pineapple or pseudocone gall is often confused with the actual cone of the tree, due to their superficial resemblance. Pineapple galls are distinguishable by their small size, position on the base of budding twigs, and habit of the branch growing on and extending past the gall.
The pineapple gall adelgid is endemic to Europe, belonging to the 'woolly adelgid' group; it is also widely distributed in the north... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Pineapple-Gall Adelgid sighting in Boston on a given day, based on 60 verified sightings from GBIF citizen-science data. It is the 220th most-seen of the 1200 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
November to April
In those months about 10% of wildlife watchers report a Pineapple-Gall Adelgid in Boston on a given day, against under 5% in May to October, the lowest months.
Yes
Of the 2 cities where we can rate Pineapple-Gall Adelgid sightings, Boston has the highest daily chance: about 10%. Next come Toronto (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Pineapple-Gall Adelgid is recorded against all the insects logged in Boston (60 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.
