Pine needle scale: what the agencies record

This page reports what the official source says. It is not legal advice: ask the office named here. It does not identify what is wrong with any tree and does not say what should be done about one. The pine needle scale (Chionaspis pinifoliae) is a native North American insect, and none of the three pages read lists it as regulated or notifiable. Each section names its source, all read on October 9, 2026. The parent page, insect pests of trees, compares it with the other pests on the list.

Names

Natural Resources Canada, called NRCan, gives the scientific name Chionaspis pinifoliae (Fitch), the French name cochenille des aiguilles du pin, and places the insect in the armored scale family, Diaspididae. Penn State Extension uses the same scientific name and calls it an armored scale insect. The University of Kentucky lists it among the sap-feeding pests of landscape pines.

Hosts and where it is found

NRCan says the insect is found throughout North America, is native, and attacks pine, spruce, hemlock, yew and balsam fir. It says dwarf mugho pine and blue spruce are especially susceptible, and that in the Prairie Provinces it most commonly attacks white and Colorado blue spruces, with trees usually attacked when young and the worst damage in nurseries, shelterbelts and ornamental plantings. NRCan says it is not a threat to the natural forests of the Prairie Provinces. Penn State calls it a key pest of pines, found in Pennsylvania landscapes, nurseries and Christmas tree plantations, and lists mugo, Austrian, red, Scots and eastern white pine, Douglas-fir, most spruces and cedars as hosts. Kentucky names mugho and Scots pine as the pines attacked most often and says nearly every conifer with needles can be infested.

What the sources say to look for

NRCan says waxy, oval white specks about 3 mm long on the needles are usually the first sign, and that when the scale is abundant the needles look white from a distance. Penn State gives the female cover as about 3 mm long, white with a yellow tip at the narrow end, and the male cover as white and 2 mm long; it says crimson red eggs show in early spring under the female's cover. Kentucky describes a narrow white waxy covering with a yellow spot at one end, and says heavy infestations can give a gray cast to the whole tree and make needles yellow and stunted. The foliage of severely infested trees may take on a whitewashed look, per Penn State.

Life cycle as the sources state it

NRCan and Kentucky say the insect overwinters as eggs under the female's scale cover, and Penn State says as females and eggs. The number of generations differs by place. NRCan gives one generation a year in the Prairie Provinces, with most hatching between late June and mid-July, and says 30 to 50 eggs fill the cavity under each scale. Penn State gives two generations in Pennsylvania, with crawlers hatching in mid to late May and a second batch of eggs laid in mid-July, and says as many as 40 eggs may lie under each scale. Kentucky also gives two generations, with the first crawlers in late April to early May and the second in mid to late July.

NRCan and Penn State describe the crawler as the reddish first stage that wanders over the needles before settling to feed, and Penn State adds that it then secretes its waxy cover. Kentucky calls it the mobile crawler stage that moves to feeding sites on the needles. NRCan says the crawlers may be carried to nearby trees by the wind. It describes males that develop into winged adults which hover in swarms in sunny, sheltered spots between infested trees in late July and early August, and females that stay fixed on the needles for life.

Damage as the sources describe it

NRCan says the insect sucks sap from the needles, and that severe infestations often turn all the foliage except the newest growth yellow, cut needle size to half on severely infested pines, and sometimes kill trees of low vigor. Penn State says the needles turn yellowish brown, a severe infestation can reduce plant health, thin the foliage and kill infested twigs. Kentucky says whole branches may be killed and the entire tree may eventually look sickly and die. NRCan adds that continuing infestations reduce vigor and growth and leave trees more open to other insects, diseases and environmental stress.

Regulated status and reporting

None of the three pages names a regulation, quarantine order or report line for the pine needle scale. For the agencies that take reports of regulated pests, see the guides on reporting a pest in Canada and the United States.

Management as the sources list it

NRCan names ladybird beetles and tiny parasitic wasps as important natural controls, and says extreme heat or heavy rain right after hatching destroys many crawlers. Penn State also names lady beetles and wasp parasitoids and describes monitoring and registered insecticides aimed at crawlers. Kentucky describes sprays aimed at crawlers and a dormant oil spray. This page gives no product names, rates or timings. For who may apply pesticides, see pesticide licences.