Pemphigus populivenae

Family: Aphididae | Genus: Pemphigus
Detachable: integral
Color: pink, red, yellow, green
Texture: hairless
Season: Summer
Alignment: erect
Location: upper leaf, lower leaf, leaf midrib
Form: pocket
Possible Range:i
Common Name(s):
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image of Pemphigus populivenae
image of Pemphigus populivenae
image of Pemphigus populivenae

Aphids on the world's plants

Pemphigus populivenae Fitch

Galls are elongate pocket-shaped or cock's comb-shaped, greenish or yellowish or pale red, arising alongside mid-rib on upper side of leaf, with a slit-shaped opening underneath. On heavily-infested trees, galls may occur on both sides of the leaf, and those on the underside may then be confused with those of P. betae (Maxson & Knowlton 1934; however see also Footit et al. 2010). Whitham (1978) reported that P. populivenae galling Populus fremontii in Utah caused chlorosis of the leaf distal to the gall. As in the case of P. betae, several species of cottonwoods and their hybrids are colonised (angustifolia, balsamifera, deltoides, fremontii and trichocarpa; the latter species in experimental conditions only). The fundatrix is yellowish green. Alatae (BL 1.1-1.8 mm) emerge in June-July and migrate to found colonies on roots of Amaranthaceae. Rumex (Polygonaceae) may also be colonised. The evidence for this host alternation is work in California by Grigorick & Lange (1962), who transferred sexuparae from sugar beet to poplar bark under controlled conditions and obtained fundatrices that produced galls specifically on P. trichocarpa. The alatae from these galls were identified as P. populivenae, and colonised roots of B. vulgaris and Chenopodium album. However, the suggested synonymy of both P. betae and P. balsamiferae with populivenae indicates some confusion of identity, and further work seems advisable to confirm that the correct name for populations damaging sugar beet in California (e.g. Summers & Newton 1989) is in fact populivenae rather than betae. Foottit et al. (2010) have found molecular evidence that at least three taxa with similar galls occur sympatrically on cottonwoods in Alberta.

- Roger Blackman, Victor Eastop: (2013) Aphids on the world's plants©


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