This aphid (commonly known as 'blue bug') is a serious pest of apple, causing severe curling and distortion of leaves; affected tissue (pseudo-galls) may also become yellowish or brown but not red (cf. Dysaphis devecta, above). Infested shoots also become distorted and stunted and fruits remain small and malformed. Heavy infestations also lead to premature leaf-fall and will reduce cropping potential for the following year.
Eggs, overwintering on the bark, hatch in the early spring. Colonies then develop on the rosette leaves and, later, on the young shoots. Winged forms are produced in June or July, when there is a migration to Plantago, especially P. lanceolata. Colonies, however, often also persist on apple well into the summer. In early autumn a return migration occurs from summer hosts to apple, where winter eggs will be laid.
Aptera 2.1-2.6 mm long, pinkish to dark bluish-grey, coated with white, mealy wax; siphunculi black, elongate, tapered, flanged apically; cauda dark, triangular (Fig. 191d).
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