Biology, images, analysis, design...
|"It has long been an axiom of mine that the little things are infinitely the most important" |
Willow - carrot aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution:
Cavariella aegopodii apterae are small and greenish or reddish. The tips of their antennae and apices of the legs are brownish. The antennae are about 0.4 times the body length, with the terminal process about 0.85-1.3 times the basal part of segment VI (cf. Cavariella archangelicae, Cavariella konoi, Cavariella pastinacae and Cavariella theobaldi which all have the terminal process more than 1.3 times the length of the basal part of segment VI). Cavariella aegopodii siphunculi are swollen and about twice as long as the cauda. The supracaudal process is 0.75-1.05 times the cauda, broadest at the base and oblong triangular to conical. The body length of Cavariella aegopodii apterae is 1.5-2.8 mm.
The alate of Cavariella aegopodi has a central black patch on the abdominal dorsum, and a dark cauda and siphunculi. As with the aptera, it is best distinguished from the other common Cavariella species by its short terminal antennal process which is less than 1.5 times longer than the base of antennal segment VI.
The clarified slide mounts below are of adult viviparous female Cavariella aegopodii : wingless, and winged.
The willow-carrot aphid host alternates from willows (Salix spp) to umbellifers (Apiaceae). The preferred primary hosts are crack willow (Salix fragilis) and white willow Salix alba, although some Willow species seem only to be colonized in spring, by winged forms from populations which have overwintered parthenogenetically. Preferred secondary hosts are cultivated umbellifers such as carrots (Daucus carota) and fennel (Foeniculum vulgare) and several wild umbellifers. Cavariella aegopodii is widespread throughout temperate and warm temperate parts of the world.
Other aphids on same host:
Cavariella aegopodii has been recorded from more than 40 willow species worldwide.