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Western rose aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
Fundatrices of Ericaphis wakibae on rose are mottled yellowish-green (see first picture below) or mottled greenish-red (second picture below), and have generally pale siphunculi with a dark apex. A clarified mount of a fundatrix is shown in the third picture below.
Later generations of adult apterae (see second clarified mount below) are brownish green or greenish yellow, with an ill-defined dark brown mid-dorsal patch of varying extent, dark brown marginal areas, and a light area about the base of each siphunculus. Their antennae are at least as long as the body, and are progressively darker beyond the base of segment III. The rostrum reaches the second pair of coxae, with the apical rostral segment (RIV+V) usually more than 0.12 mm in length, and 1.1-1.4 times the second hind tarsal segment (HTII) (cf. Ericaphis fimbriata, which has RIV+V 0.8-1.1 times HTII). The dorsal abdomen is sclerotic (cf. Ericaphis fimbriata which has the dorsal abdomen pale and membranous). The tibiae are yellowish brown with dark tips. Hairs are blunt and inconspicuous. The siphunculi are slender, cylindrical and imbricated, pale brown and dark-tipped. They are 2.0-2.7 times the caudal length (cf. Ericaphis fimbriata, which has siphunculi 1.5-1.9 times the cauda). The cauda is broad tapering to a point, and bears 2 pairs of lateral hairs. The body length of adult Ericaphis wakibae apterae is 1.6-2.8 mm.
Alatae of Ericaphis wakibae (see two pictures below) have a dark head and thorax. The abdomen is dark green with black cross bars on each tergite. The bars are fused into a large black patch on tergites IV-VI. There are large dark marginal sclerites, but there is usually a clear patch between the siphunculi. The siphunculi are dark and cylindrical, with very faint reticulations.
The primary hosts of Ericaphis wakibae are in the Rosaceae, including roses (Rosa spp.), strawberries (Fragaria spp.) and berries (Rubus spp.). Its secondary hosts are thought to be mainly in the Ericaceae, including plants such as rusty menziesia (Menziesia ferruginea) and Alaska blueberry (Vaccinium alaskaense), but the life cycle has not been studied, and in some areas the species is monoecious holocyclic. Ericaphis wakibae is widely distributed in North America, and has been introduced to the United Kingdom where it is monoecious on wild strawberry (Frageria vesca). It has also apparently been reported from north-east Siberia.
Other aphids on the same host
Ericaphis wakibae has been recorded on 5 species of rose (Rosa gymnocarpa, Rosa nutkana, Rosa rubrifolia, Rosa rugosa, Rosa woodsii).
Ericaphis wakibae has been recorded on 2 species of strawberry (Fragaria x ananassa, Fragaria vesca).