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Asian woolly hackberry aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
For several species in genus Shivaphis, only alate viviparae are known, but in Shivaphis celti apterae also occur. Adult apterae of Shivaphis celti (see first picture below) are pale to dusky greenish, sometimes pinkish (or orange?). They are covered in bluish-white flocculent (=foam-like) wax which is borne in streamers, especially from the head, thorax, abdomen and legs. The head, thoracic and abdominal segments all bear dorsal and dorsolateral wax glands. The wax gland pores resemble biscuits, with well defined facets. The antennae have a rather short terminal process, about 0.25 times the length of the base of antennal segment VI, and only about 3 times as long as wide (cf. most other Shivaphis apart from Shivaphis catalpinari, all in Asia, which have the terminal process at least 6 times longer than the base is wide). The eyes are brilliant red with well developed ocular tubercles. The rostrum is elongate, reaching between the fore and middle coxae, with the apical segment longer than its basal width. The fore coxae are strongly enlarged (cf. Shivaphis catalpinari in Turkey & China, which have the fore coxae weakly enlarged). The siphunculi are very short, their length being about half their diameter. The apical part of the cauda is finger-like, but rather irregular in shape (cf. Shivaphis catalpinari, where the apical part of the cauda is a rounded knob). The body length of the adult Shivaphis celti aptera is 1.9-2.6 mm. Immatures are yellowish green.
First image above copyright Erin Powell, second image copyright Jonathan Breytenbach,
Alate Shivaphis celti (see second picture above and pictures below) are also wax-covered, with forewing veins thickly bordered with fuscous distally, and have large black patches on the pterostigma and distal part of wing vein Cu1b. Antennal segment III has 9-11 secondary rhinaria distributed on the middle part of the segment. On the abdomens of alatae, the wax glands are often on sclerites.
First image above copyright cecileroux, second image copyright CBG group,
Shivaphis celti feeds on the undersides of leaves or on the shoot tips of hackberries (Celtis species). S. celti is usually monoecious holocyclic in its native habitat (East and South east Asia), with sexuales occurring late in the year, eggs laid in January and hatching in March. However, in some parts of East Asia, and in countries where it is invasive, populations may be partly or completely anholocyclic. Shivaphis celti was introduced to Florida, USA in the late 1990s, and by 2002 had spread to California. It has since been found in Australia and South Africa.
Other aphids on the same host
Shivaphis celti has been found on 16 hackberry / nettle-tree species (Celtis africana, Celtis australis, Celtis biondii, Celtis bungeana, Celtis cinnamomia, Celtis hamiltoni, Celtis jessoensis, Celtis juliane, Celtis koraiensis, Celtis kunmingensis, Celtis laevigata, Celtis nervosa, Celtis occidentalis, Celtis sinensis, Celtis tetranda, Celtis triandra).