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Eulecanium corni (Bouché), {Eulecanium persicae (F.)}
Parthenolecanium corni

Insecta, Homoptera, Lecaniidae .

European fruit scale, Brown scale, Peach scale

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

2 Lecaniidae cause severe damage to Vine. Nymphal forms are extremely closely allied and distinction can be made only between adult forms.
E. corni: globe-shaped, 4-6 mm long, 4 mm wide; mahogany-brown, shiny, lacking a median carena, with marked marginal rough patches (*) .
E. persicae: more elongate, measuring up to 10 mm long, red brown, dull, with a marked median carena but no marginal rough patches (*) .

- E. persicae infests vine, peach, currant, rose (Rosa) and Wistaria.
- E. corni is more polyphagous and also attacks plum, cherry, apricot, walnut, hazel, dogwood (Cornus).
Young nymphs move rapidly on the surface of plants and may be transported by the wind over long distances. They occur on the underside of leaves, especially along the veins.
- Number of eggs produced: 1500-2000.
- Non-fertilized females only produce females.
- Duration of incubation: 15-30 days.

[R]Life Cycle
- Hatching begins in mid-June, the 1st nymphal moult ocurring in mid-August. Nymphs overwinter on roots, branches and trunks.
- Adults emerge in April and migrate to young branches, shoots and young leaves(*) . The female lays her eggs during several days from late May to early July. She then dies, her scale protecting the eggs during the whole embryonic development period (*) .
- Males (*) become adults when female nymphs have completed the 2nd moult.

Blossom on affected plants is sparce, fruits remain small; fruit trees are often covered with considerable quantities of sooty moulds.

[R]Common Names
DE: Gemeine Napfschildlaus, Zwetschgen-Napfschildlaus ES: Cochinilla de la vid FR: Lecanium du cornouiller et de la vigne IT: Cocciniglia del corniolo PT: Lapa da vinha GB: European fruit scale, Brown scale, Peach scale

[R] Images

  1. Eulecanium corni (Bouché) (Coutin R. / OPIE)
    Colony of female scales on elm
  2. Eulecanium corni (Bouché) (Coutin R. / OPIE)
    Female and nymphs on shoot of vine
  3. Eulecanium corni (Bouché) (Coutin R. / OPIE)
    Eggs The scale of the female was lifted to show the eggs protected beneath it. A translucent male scale can be seen above on the left.
  4. Eulecanium corni (Bouché) (Coutin R. / OPIE)
    Male scales Winged males left their scales before mating. Some individuals were parasitized (arrowed).
  5. Eulecanium corni (Bouché) (Coutin R. / OPIE)
    Eulecanium persicae Colony of female scales.

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