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Pistacia horn gall aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
Baizongia pistaciae produces large, horn-shaped galls (see first picture below) on Pistacia trees. Adult apterae of Baizongia pistaciae are plump-bodied, whitish or pale yellow with brown head, prothorax, antennae, legs and anal region pale brown, producing wax in short threads (see second picture below). The body and appendages have sparse hairs, all with pointed apices. They have no siphunculi. The body length of adult Baizongia pistaciae apterae is 1.6-2.3 mm.
First image above, by permission, copyright Brian Eversham all rights reserved.
Alate Baizongia pistaciae, which develop in the gall from September to November (see third picture above), have a variably developed series of short dark abdominal cross-bars. The pterostigma has a dark central patch. The terminal process of the antenna is 0.35-0.45 times the length of the base of the last segment. The apical rostral segment (RIV+V) is 0.6-0.9 times the length of the second segment of the hind tarsus. Dorsal hairs are all with pointed apices.
Baizongia pistaciae host alternates from pistachio trees (Pistacia) to grass roots. Among the grasses colonised are species of Agrostis, Avena, Corynephorus, Dactylis, Festuca and Poa. Baizongia pistaciae colonies are attended by ants, especially Lasius flavus, and may overwinter in ants' nests. Host-alternating populations occur in the Mediterranean area, and in north-west India. Anholocyclic populations are found on grass roots in many parts of the world including Europe, north Africa, Kenya, India and Pakistan.
Other aphids on same host:
Baizongia pistaciae has been recorded from at least 7 Pistacia species, but its presence on Pistachio (Pistacia vera) is unconfirmed. It has not been recorded from Pistacia in Britain.