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Corylobium avellanae (Schrank)
Insecta, Homoptera, Aphididae .

Hazelnut aphid, Large hazel aphid

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

[R]Description
Adult: 1.5 mm long; globe-shaped; pale green to slightly pinkish. This aphid, being similar in coloration to plant petioles, is difficult to detect (*) .

[R]Biology
This species occurs almost exclusively on new shoots, young twigs and especially fruit-bearing twigs of hazel.

[R]Life Cycle
An autoecious species overwintering in the egg stage, eggs being black and laid at the base of those buds (*) which, in spring, will carry female flowers. There are several generations per year.

[R]Damage
Affected plant parts, especially hazelnuts and their cupules, do not become distorted but are covered with vast quantities of honeydew and sooty moulds. The size of hazelnuts is sometimes reduced.

[R]Common Names
DE: Haselnußlaus ES: Pulgón verde del avellano FR: Grand puceron du noisetier, Puceron vert du noisetier IT: Afide verde del nocciolo o Afidone del nocciolo PT: Piolho da aveleira GB: Large hazel aphid, Hazel nut aphid

[R] Images

  1. Corylobium avellanae (Schrank) (Coutin R. / OPIE)
    Winter egg Protected by the axil of a bud (arrowed).
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  2. Corylobium avellanae (Schrank) (Coutin R. / OPIE)
    Female and her progeny On fructiferous twig of hazel.
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