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Aspidiotus nerii BouchÚ
Insecta, Homoptera, Diaspididae .

Oleander scale

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

- Adult: females possess an almost circular scale, 1.8 to 2.2 mm in diameter, slightly convex, pale blackish-brown in colour, uniform and matt. Nymphal exuviae are slightly excentric (*) .
The male is winged (1 pair of wings, whitish membrane), and small. It is no more than 1 mm long, with a yellowish body and blackish-brown appendages.

- This highlypolyphagous scale insect attacks olive, Citrus fruits, plum and various trees, shrubs and low-growing plants: acacia, carob (Ceratonia), mulberry (Morus), ivy (Helix), oleander (Nerium), palm (Phoenix) (*) , etc.
- Adults: reproduction is exual or parthenogenetic. The female lays about 150 yellow eggs in about 5 to 12 days; from 4 to 30 eggs each day.
- Nymph: between the newly emerged, mobile nymph and the imaginal moult about 40 to 50 days are required.

[R]Life Cycle
- This scale insect usually has three generations per year. This corresponds to three waves of emergence of mobile nymphs, which can be assigned to succeeding generations. Individuals of all ages coexist on the same plant.
- Winter is normally passed as young female or older nymph, but younger nymphs may also overwinter, becoming active again later in the spring.
The first generation starts in March-April; males are numerous. Mobile nymphs then move towards sheltered areas of the tree, settling preferably on the underside of foliage. This generation develops in 8 to 9 weeks.
A second generation then occurs, taking a similar amount of time to develop. The third generation commences in September-October and is maintained for 6 months, until the end of winter.

The damage caused by this piercing and sucking insect consists of weakening of the plant, leaf fall, drying of shoots and the deformation of fruits, the latter being particularly serious in the case of table olives(*) .
Honeydew favours the development of sooty moulds and attracts ants and other insects.

[R]Common Names
DE: Oleanderschildlaus ES: Cochonilla blanca del olivo FR: Cochenille du laurier-rose IT: Cocciniglia bianca del limone, Cocciniglia biancadell'oleandro, Cocciniglia bianca dell'edera PT: Cochonilha branca, Escama branca da oliveira GB: Oleander scale

[R] Images

  1. Aspidiotus nerii Bouché (Daumal J. / INRA Antibes)
    Nymphs and females on olive
  2. Aspidiotus nerii Bouché (Benassy C. / INRA)
    Damage on rough lemon
  3. Aspidiotus nerii Bouché (Benassy C. / INRA)
    Colony on leaf of palm

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