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Lepidosaphes ulmi

 

Description

Female adult: scale pale or dark brown, 2-3.5 mm long, egg-shaped, elongate and often comma- shaped, cast skins pile up at the anterior part of the scale. Eggs are oval and white. Nymphs yellowish- brown, mobile and egg-shaped.

Biology and Damage

It is very polyphagous. It feeds on fruit trees, forest trees and ornamentals. Eggs overwinter under the female’s scale and hatch from May onwards. Young nymphs are iniatially mobile but settle on the twigs and branches 2-3 days after hatching. After 2 moults, they become females in June and July. Females produce parthenogenetically in the autumn. Each lays 40-80 eggs and then dies, the eggs overwintering under the scale. They very often can be seen on hazelnut branches in low population in Turkish hazelnut orchards. They produce one generation in hazelnut orchards of Turkey.Infestations cause encrustations to appear on branches, twigs and fruits and also lead to a splitting of the bark, affected parts becoming progressively dry and eventually dying.

Common Names

DE: Gemeine Kommaschildlaus, ES: Serpeta del olmo, FR: Cochenille virgule du pommier, IT: Cocciniglia a virgola dell’Olmo e dei fruttiferi, GB: Oystershell scale, Muel scale, TR: Virgül kabuklu biti