Aphis nasturtii Kaltenbach Buckthornpotato aphid

This generally common species is a minor pest of certain vegetable crops, especially potato and watercress. The aphids cause little direct damage and tend to be of greater significance as vectors of viruses, including potato virus A, potato virus Y and turnip mosaic.

BIOLOGY

This aphid overwinters in the egg stage on Rhamnus. Colonies develop during the spring from April onwards and, in June, winged forms migrate to a wide variety of summer hosts, including potato, tomato and watercress. Breeding continues on these hosts until a return migration to Rhamnus takes place in early September.

DESCRIPTION

Aptera 1.1-2.2 mm long, bright yellow to yellowish-green; antennae much shorter than body; siphunculi short, pale with dusky tips but often entirely brown; cauda short and tapered (Fig. 190a).

Infested Plants

Fig. 190 Siphunculi and caudas of some aphids associated with bulb or potato crops: (a) buckthorn/ potato aphid, Aphis nasturtii; (b) glasshouse & potato aphid, Aulacorthum solani; (c) potato aphid, Macrosiphum euphorbiae; (d) shallot aphid, Myzus ascalonicus; (e) peach/potato aphid, Myzuspersicae; (f) bulb & potato aphid, Rhopalosiphoninus latysiphon; (g) mangold aphid, Rhopalosiphoninus staphyleae tulipaellus.

Fig. 190 Siphunculi and caudas of some aphids associated with bulb or potato crops: (a) buckthorn/ potato aphid, Aphis nasturtii; (b) glasshouse & potato aphid, Aulacorthum solani; (c) potato aphid, Macrosiphum euphorbiae; (d) shallot aphid, Myzus ascalonicus; (e) peach/potato aphid, Myzuspersicae; (f) bulb & potato aphid, Rhopalosiphoninus latysiphon; (g) mangold aphid, Rhopalosiphoninus staphyleae tulipaellus.

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