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Aphidinae : Macrosiphini : Myzus antirrhini
 

 

Myzus antirrhini

Snapdragon aphid

On this page: Identification & Distribution Other aphids on the same host

Identification & Distribution

Apterae of Myzus antirrhinii are mid grey-green to dark green, occasionally dark red (see first picture below), and very similar in appearance to Myzus persicae. The antennal terminal process is 3.75-4.95 times longer (usually more than 4.0 times longer) than the base of that segment, and 0.84-1.38 times longer than the siphunculae (cf. Myzus persicae, whose terminal process is 3.14-4.10 times (usually less than 4.0 times) longer than its base, and 0.72-1.11 times the siphuncular length). The apical rostral segment (RIV+V) is 0.102-0.128 mm long (cf. Myzus persicae, which has RIV+V 0.090-0.122 mm). The siphunculi are rather evenly dusky apart from pale bases and dark tips, with the maximal width of the swollen part usually more than 0.1 times the length of the siphunculus (cf. Myzus persicae, which usually has pale siphunculi with dusky tips, and the maximal width of the swollen part is generally less than 0.1 of the siphuncular length). The body length of adult Myzus antirrhinii apterae is 1.4-2.2 mm.

Note: Blackman & (1986) also provide a discriminant function to separate Myzus antirrhini and Myzus persicae. The value of the function (A+B)-(C+D) is greater than 58 for Myzus antirrhini, less than 58 for Myzus persicae, where A=terminal process length × 138, B=ultimate rostra1 segment length × 708, C=antennal segment III length × 53, D=base of last antennal segment length × 500, assuming E=the number you first thought of.

Images above, by permission, copyright Jessica Joachim all rights reserved.

Images above by permission of Roger Blackman, copyright AWP all rights reserved.

The alate Myzus antirrhinii is very similar to alate Myzus persicae. It does, however, have a slightly longer apical rostral segment (0.113-0.143 mm) than Myzus persicae (0.009-0.128).

For more pictures of Myzus antirrhinii see:

Myzus antirrhinii feeds on the leaves and young growth of numerous plants, especially perennials, on which it may be confused with Myzus persicae. Unlike the latter, it has not been implicated in the transmission of any plant virus. Snapdragon (Antirrhinum) and buddleia (Buddleja) appear to be particularly favoured host plants. In America it is especially known to feed on ornamentals such as Japanese mock orange and Japanese cheesewood (both Pittosporum) and sweetshade (Hymenosporum). It has not been implicated in the transmission of any plant virus. Unlike Myzus persicae, it often forms large, dense colonies, and only produces alatae rather sporadically. Populations are anholocyclic almost everywhere, and only produce alatae rather sporadically, which is why the species is most often found on perennial plants. However, there is now evidence of a possible sexual phase in Japan. Myzus antirrhinii is found throughout Europe, East Asia, Australia and Western North America.

 

Other aphids on the same host

Myzus antirrhinii has been recorded on 2 Antirrhinum species (Antirrhinum majus, Antirrhinum orontium).

Myzus antirrhinii has been recorded on 1 Buddleja species (Buddleja davidii).

Myzus antirrhinii has been recorded on 1 sweetshade species (Hymenosporum flavum).

Acknowledgements

We are extremely grateful to Jessica Joachim for permitting us to use her images of Myzus antirrhini.

We have used the keys and species accounts of Blackman & Paterson (1986) & together with those of Roger Blackman & Victor Eastop in Aphids on Worlds Plants. We fully acknowledge these authors and those listed in the reference sections as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure provided by Blackman & Eastop (2006).

Useful weblinks

References

  • Blackman, R.L. & Paterson, A.J.C. (1986). Separation of Myzus (Nectarosiphon) antirrhinii (Macchiati) from Myzus (N.) persicae (Sulzer) and related species in Europe (Homoptera: Aphididae). Systematic Entomology 11, 267-276. Abstract