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Eriosoma lanigerum (Hausmann)
Schizoneura lanigerum

Insecta, Homoptera, Pemphigidae .

Woolly aphid, Woolly apple aphid, American blight, Apple root aphid

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

- Apterous individuals: about 2 mm long; purplish-black but this coloration concealed by a woolly and filamentous wax covering, hence the name 'woolly aphid' (*) .
Alatae: body brown and lightly coated with a woolly covering; siphunculi pore-like and hardly visible.

- Host plants: in America, the country from which it originates, this aphid has a sexual phase on its primary host, the American elm (Ulmus americana). In Europe, it reproduces exclusively parthenogenetically on apple. It is also to be found on quince but is rarely present on pear.
- Apterous nymphs and females overwinter under bark, in crevices in the trunk of trees, cankers or on roots near the collar. Activity resumes in early spring (March-April) and females begin to reproduce, each producing more than 100 nymphs.
Heavy infestations form dense whitish colonies. Adults and nymphs feed by sucking up sap from ligneous parts or tender shoots but never from leaves (*) .
Alatae appear from July onwards and migrate, thereby forming new colonies on other trees.

[R]Life Cycle
- The capacity of this aphid to multiply is very important: 10-12 generations succeed one another until the autumn.

- Probing and the injection of toxic saliva cause blisters and cankers to appear which can reach the size of a walnut and interfere with the circulation of the sap. Affected trees decline and can be attacked by secondary pests.
- Biological control attempts were carried out at the beginning of this century, using the parasite specific to the woolly aphid: Aphelinus mali (Hymenoptera).

[R]Common Names
DE: Blutlaus ES: Pulgon lanigero del manzano FR: Puceron lanigère du pommier IT: Afide lanigero o pidocchio sanguigno del melo PT: Pulgão lanígero da macieira GB: Woolly aphid, Woolly apple aphid, American blight, Apple root aphid

[R] Images

  1. Eriosoma lanigerum (Hausmann) (ACTA)
    Colony on trunk of apple On the scar tissue formed after cutting of a twig.
  2. Eriosoma lanigerum (Hausmann) (Coutin R. / OPIE)
    Detailed picture of a colony on apple It is possible to see the filamentous wax produced by the aphids.

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HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.

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