Pine Woolly Aphid - Pineus pini

Alternative names
Scots Pine Adelgid

The apterous female of Pineus pini, known as the 'sistens' is covered in white wax wool. Under the wax the sistens is dark brown to dark red, and almost spherical. The adult Pineus pini aptera has a body length of 1.0 to 1.2 mm. It is associated with Scots Pine where it can cause serious damage.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required and your record should state whether the aphids were recorded on Scots Pine.


On Scots Pine.

When to see it

Colonies can always be found on the smaller stems and shoots of pine throughout the year with three or more generations per year.

Life History

Infestation of Scots Pine by this species causes premature needle shedding and reduction in the length of infested needles. Pineus pini has an overwintering generation on the twigs, and two or more overlapping generations attacking the current year's shoots. Pineus pini eggs are laid in abundant wax-wool. The second of the summer generations in May-June includes winged forms which disperse to other pine trees.

UK Status

Status in Britain is difficult to determine due to lack of records.

VC55 Status

Status in Leicestershire and Rutland not known.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map