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Pine Bark Adelgid


Pine Bark Adelgid

Usually appear in

All Year

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Caused By:-     The Adelgid Pineus strobi


The Pine Bark Adelgid Pineus strobi is aphid-like insects in the family Adelgidae that primarily feeds on pines(Pinus), Spruce(Picea), Larch(Larix) and Silver Fir(Abies). It is closely related to the Pine Adelgid Pineus pini.
The immature adelgids resemble the adult, and are initially yellow but darken with age. The adult is small (about 1/32 inch), dark purple, tear-drop shaped with short legs, and covered by the white woolly secretions. The eggs are white to light brown colour and hidden under the white woolly mass secreted by adult females.
They feed by sucking their host plants sap. It can be problematic for small nursery stock where heavy infestations can discolour, stunt or weakened the tree. On older trees, although unsightly, permanent damage should not result.
They overwinter as immature females on the bark and branches and have several generations per year. Infestations are recognised by the presence patches of white cottony fungus-like material on the bark of trunks and limbs, on buds or at the bases of needles. Pine tree trunks of heavily infested trees often appear to be whitewashed.
See ADELGID, PINE ADELGID, PINEAPPLE GALL ADELGID. Picture by John A. Weidhass, Virginia Polytechnic Institute and State University,


There is usually no need for spraying as there are plenty of predators about which keep this pest in check and the damage is minimal once the tree is established. This pest is more of a cause for concern on young seedlings in nurseries. Spraying is often not very effective due to the waxy coating, but if done in the early winter before the nymphs have produced its waxy coatings it will be more effective. If beneficial predators are present, the use of "predator friendly" insecticides, such as insecticidal soap or horticultural oils, should be used.
Encouraging its predators like Ladybird beetles, Leucopis obscura and hoverflies, which feed on the adelgid, will control populations.

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