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Red goldenrod aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
Adult apterae of Uroleucon nigrotuberculatum (see first picture below) are bright to dull orange-red with dark antennae, legs and siphunculi, and a pale cauda (cf. Uroleucon nigrotibium, which is dark brown with dark appendages and pale cauda). Antennal tubercles are well developed. The longest hairs on antennal segment III are about as long as the basal diameter of that segment. The apical rostral segment (RIV+V) is roughly equal to or slightly longer than the second hind tarsal segment (HTII). The aptera has small black marginal tubercles on the abdomen (cf. Uroleucon rudbeckiae and Uroleucon ambrosiae, which have no such tubercles). The proximal half of the femora is pale, the distal half dark. The tibiae are dark brown or black for their entire length (cf. Uroleucon pieloui and Uroleucon gigantiphagum, which have the tibiae of apterae lighter basally). Each first tarsal segment usually has 4 hairs. The siphunculi are uniformly black (cf. Uroleucon rudbeckiae, which has siphunculi with pale bases). The cauda bears 23-32 hairs. The body length of adult Uroleucon nigrotuberculatum apterae is 2.4-4.3 mm.
Note: Blackman, in Aphids on Worlds Plants, has suggested that Uroleucon pieloui and Uroleucon gigantiphagum may turn out to be synonyms for Uroleucon nigrotuberculatum.
First image above copyright Stephen Luk, second image above copyright Kevin.
The alate Uroleucon nigrotuberculatum (see second picture above) has the body dull orange-red, with dark antennae and legs. Antennal segment III has 29 - 53 secondary rhinaria. The legs have the proximal half of the femora pale, and remaining portions dark. There are dusky marginal sclerites on abdominal segments II, III, and IV and dusky scleroites scattered over the abdomen. Some or all marginal sclerites bear small, dark, and elongate or cone-shaped tubercles. The siphunculi are uniformly black and the cauda is pale, usually with a dusky tip, and bearing 22-28 hairs. Immature Uroleucon nigrotuberculatum are similarly coloured to the adults.
First image above copyright Pollinator under a Creative Commons Attribution-Share Alike 3.0 Unported license.
In their native North America, Uroleucon nigrotuberculatum feed on goldenrods (Solidago spp.). When introduced into Japan, the species was initially found feeding on other genera in the Asteraceae (Callistephus, Chrysanthemum, Helianthus, Rudbeckia) and on Oenothera. Sugimoto & Matsumoto (2000) report they later they became more specific to an introduced goldenrod species (Solidago altissima). Different hosts (Eupatorium and Montanoa spp.) have also been reported at high altitudes in Mexico. Sexuales are produced in autumn. Uroleucon nigrotuberculatum are distributed across North America, and are now found in Japan.
Other aphids on the same host
Uroleucon nigrotuberculatum has been recorded from 12 species of Solidago (Solidago altissima, Solidago arguta, Solidago bicolor, Solidago canadensis, Solidago elongata, Solidago gigantea, Solidago juncea, Solidago nemoralis, Solidago odora, Solidago rugosa, Solidago sempervirens, Solidago ulmifolia).