Adelges abietis
In 3 days ~10% in a week ~20%
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 →
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Rare
Under 5% of wildlife watchers report a Pineapple-Gall Adelgid sighting in Toronto on a given day, based on 17 verified sightings from GBIF citizen-science data. It is the 945th most-seen of the 1689 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 Pineapple-Gall Adelgid in Toronto on a given day, so our monthly data shows no clear season.
2nd of 2
Of the 2 cities where we can rate Pineapple-Gall Adelgid sightings, Toronto ranks 2nd at under 5%. The best odds are in Boston (United States, about 10%).
Same order: Hemiptera
The closest relatives of the Pineapple-Gall Adelgid that you can see in Toronto (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are European Firebug (about 20%), Eastern Boxelder Bug (about 20%) and Brown Marmorated Stink Bug (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Pineapple-Gall Adelgid is recorded against all the insects logged in Toronto (17 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.
