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Epidiaspis leperii (Signoret)
Epidiaspis betulae, Diaspis leperii

Insecta, Homoptera, Diaspididae .

Italian pear scale, Grey pear scale

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

- Adult: female hidden under a circular scale measuring 1.4-1.8 mm across; scale grey-white or whitish-yellow, dark red in the middle; body pink (*) ; male wingless and with a small, elongate, white scale.

- Host plants: common on pear, the Italian pear scale also develops on peach, plum, apple, walnut as well as various other fruit or forest trees.
- The fertilized female overwinters. Activity resumes in spring and egg-laying starts in May, continuing until the autumn. Average number of eggs produced: 40.
- Young nymphs are mobile for a few hours and then settle down mainly on the twigs by inserting their stylets into the plant and begin constructing their scale (*) . They continue to develop and become adult in the autumn. Males appear in August.

[R]Life Cycle
- There is 1 generation per year. However, colonies of a different age may be found on the same tree due to the protracted egg-laying period. Nymphs produced late die if climatic conditions are not favourable.

- Feeding punctures of adults and nymphs cause a delay in plant growth, the formation of splits and distortions (*) . Heavy infestations lead to the appearance of encrustations which cause the branches and twigs to dry out (*) . Fruit production is also reduced. Apple is affected onlu slighly but plum and especially peach react by producing gummy secretions.

[R]Common Names
DE: Rote austernförmige Schildlaus, Rote Austernschildlaus ES: Cochinilla gris del peral FR: Cochenille rouge du poirier IT: Cocciniglia grigia del pero PT: Cochonilha vermelha da pereira GB: Italian pear scale, Grey pear scale, Red oystershell scale

[R] Images

  1. Epidiaspis leperii (Signoret) (Coutin R. / OPIE)
    Colony on trunk of walnut Circular scales of females.
  2. Epidiaspis leperii (Signoret) (Coutin R. / OPIE)
    Female scales on pear in winter In the preceding spring, nymphs had settled on the axil of a flower, the petiole mark of which can be seen.
  3. Epidiaspis leperii (Signoret) (Coutin R. / OPIE)
    Scales on pear The scale of a female was lifted so as to show the red body of the female as well as its winter eggs.
  4. Epidiaspis leperii (Signoret) (Coutin R. / OPIE)
    Damage on peach .

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