Spruce gall aphids - Sacchiphantes spp. and Adelges spp.
Symptoms / species
Impact / measures
Galls 1 to several cm in size, at first green, later on brown, shape of a pineapple, on the base of shoots (Sacchiphantes) or on the end of the shoots (Adelges); yelowing and loss of needles distal to the galls, shoot distortion, dieback
Affected tree species
Needle; Stem; Shoot/Twig/Branch;
Very common on Norway spruce; heavy infestation causes shoot- and twig-dieback as well as growth anomalies; most of the species of spruce gall aphids have larches as alternate hosts, where they cause damage to needles; hardly any possibility or errors.
Curative measures If possible, removing of the unripe galls; insecticides: application in winter or at the time of flushing (see official register of Plant Protection)