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Dark-striped aspen aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
Adult apterae of Chaitophorus neglectus (see two pictures below) are usually yellowish-green to green, with a somewhat brownish head, prothorax and posterior abdomen, and typically with a pair of dark pleural stripes of varying width running from the thorax to abdominal tergite VI. Occasionally the body may be completely green (see third picture below) without darker dorsal markings, other than dark green flecks. Antennal segments I, II and (usually) IV-VI are dark or dusky, with the others pale (cf. Chaitophorus populifolii, which usually has all antennal segments pale). The antennae bear long hairs, about 3 times the basal diameter of antennal segment III. Abdominal tergites I-VI are always fused, whilst tergite VII is free or fused to segment VI (cf. Chaitophorus leucomelas, which has abdominal tergite I almost always free from tergites II-VI.) Chaitophorus neglectus has the hairs on each tergite arranged in two irregular rows (cf. Chaitophorus stevensis, which has the hairs arranged on each tergite more-or-less in a single row). Most of the long spinal and pleural hairs on tergites I-VII have pointed or blunt apices (cf. Chaitophorus populifolii, which has most of such hairs with expanded or bifurcate apices) The siphunculi are pale and reticulate, about as long as antennal segment I. The cauda is tongue shaped or distinctly knobbed (cf. Chaitophorus populicola, which has the cauda rounded with no trace of constriction). The anal plate is entire. The body length of adult Chaitophorus neglectus apterae is 1.7-2.5 mm.
Images above copyright (2011), Her Majesty the Queen in Right of Canada, Agriculture & Agri-Food Canada.
Chaitophorus neglectus alatae (see second picture below) have dark dorsal abdominal cross-bands and dark siphunculi (cf. Chaitophorus populifolii, which have fewer bars and pale siphunculi). The bars on Chaitophorus neglectus may be fused on tergites III-VI to give a black quadrate patch. The tarsi and last two pairs of femora are brown, but otherwise their legs are pale.
First image above copyright (2011), Her Majesty the Queen in Right of Canada, Agriculture & Agri-Food Canada.
The sexuales of Chaitophorus neglectus appear not to have been described, but they are pictured by Andrew Jensen in Aphidtrek. The ovipara (see first picture below) is dark greyish brown. The males (see second picture below) can be either alate or apterous. The apterous males are dark blackish brown with pale siphunculi and mainly dark antennae. The alate male has dark transverse bands on the abdomen which are just discernable against the dark background colour.
Images above copyright Andrew Jensen, under a Creative Commons licence.
Chaitophorus neglectus feed on aspens (Populus tremuloides, Populus grandidentata) and on eastern cottonwood (Populus deltoides) (cf. Chaitophorus populifolii, which occurs mainly on Populus balsamifera, and only rarely on Populus tremuloides). Feeding sites include the upper and undersides of leaves, or in leaves folded and stuck together by other insects. Colonies are often quite large, and are not attended by ants, although they are sometimes mixed with Chaitophorus stevensis, which is ant-attended. Chaitophorus neglectus is holocyclic, with oviparae and both apterous and alate males occurring in September-November. It is widely distributed in North America.
Other aphids on the same host
Chaitophorus neglectus has been recorded on 4 species of poplar/aspen (Populus deltoides ssp. deltoides, Populus grandidentata, Populus nigra, Populus tremuloides).