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Chrysanthemum aphidOn this page: Identification & Distribution Other aphids on the same host Damage & Control
Identification & Distribution
Adult apterae of Macrosiphoniella sanborni (see first picture below) are shiny with no wax powdering, and coloured dark red-brown to blackish brown. The antennae are dark except for the base of antennal segment III, and have 5-28 secondary rhinaria usually distributed over the entire length of antennal segment III (cf. Macrosiphoniella tanacetaria which has secondary rhinaria on antennal segment III restricted to the basal 0.6 or less). The base of antennal segment VI is 0.7-0.9 times the length of the apical rostral segment (RIV+V). The siphunculi are completely black (cf. Macrosiphoniella oblonga which has siphunculi which are mainly dark brown but paler at the base). The siphunculi are relatively short and thick, shorter than the black cauda, and with reticulation on the distal 0.6-0.8 of their length. The body length of adult Macrosiphoniella sanborni apterae is 1.0-2.3 mm. Immatures (see second picture below) are similarly coloured to the adults.
First image above copyright Marko Šćiban, all rights reserved.
The alate Macrosiphoniella sanborni is dark brown with well developed scleroites and marginal and antesiphuncular sclerites. The spinal scleroites on abdominal tergites I-III are fused into short cross bands. The clarified slide mounts below are of adult viviparous female Macrosiphoniella sanborni : wingless, and winged.
The chrysanthemum aphid is found on cultivated florists' chrysanthemums, namely Paris daisy ( Argyranthemum frutescens), Indian chrysanthemum (Chrysanthemum indicum), and florist's daisy (Chrysanthemum mortifolium). Macrosiphoniella sanborni is of east Asian origin, where it also occurs on other Asteraceae such as Anthemis, Artemisia, and Aster. Sexual morphs are not known, and reproduction is entirely parthenogenetic. The distribution is cosmopolitan.
Other aphids on same host:
Damage and control
Infestations of Macrosiphoniella sanborni on chrysanthemums result in loss of vigour, yellowing, premature leaf fall and stunted growth. In heavy infestations, the honeydew deposits secreted by the aphids favour the development of sooty moulds, and the aphids can transmit viral diseases. Control can be achieved with insecticides, but release of coccinellid larvae is more environmentally friendly.