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Myzus ascalonicus Doncaster
Rhopalomyzus ascalonicus

Insecta, Homoptera, Aphididae .

Shallot aphid

Description, Biology, Life Cycle, Damage, Common Names, Images

Apterous adult: 1-2 mm long; brownish-green; antennal tubercles well-developed and slightly convergent; antennae as long as body; distal part of siphunculi slightly swollen (*) .

Unknown before 1940, this cosmopolitan and now very common species is polyphagous and occurs on various Liliaceae (onion, leek, shallot), Compositae, Cruciferae, Gramineae, Rosaceae (strawberry), potato, beet and numerous ornamentals.
- Winged migrants appear in the spring and infest various herbaceous plants, causing severe distortion of the foliage and flower trusses. A return migration to strawberry occurs in October, winged forms giving birth to apterous virginoparae; aphids continue to reproduce parthenogenetically during the winter.

[R]Life Cycle
- An anholocyclic species reproducing parthenogenetically throughout the year. During mild winters, colonies can survive outdoors. Otherwise, aphids remain on glasshouse plants, or on crops in store (bulbs).

- Aphid colonies occur on shallot and various bulbs at the end of the storage period, thus causing the malformation of new seedlings (*) . In addition, Myzus ascalonicus is a vector of beet mild yellowing virus (BMYV) and the beet yellows virus (BYV).

[R]Common Names
DE: Schalottenlaus, Zwiebellaus ES: Pulgon del chalote FR: Puceron de l'échalote IT: Afide dello calogno PT: Piolho da echalota GB: Shallot aphid

[R] Images

  1. Myzus ascalonicus Doncaster (Coutin R. / OPIE)
    Damage to onion
  2. Myzus ascalonicus Doncaster (Coutin R. / OPIE)
    Colony on leaf of onion Adults and nymphs.

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