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Species Page

European pear scale

Epidiaspis leperii
This information is part of a full datasheet available in the Crop Protection Compendium (CPC). Find out more information on how to access the CPC.
©CAB International. Published under a CC-BY-NC-SA 4.0 licence.

Distribution

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Extent
Invasive
Origin
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Host plants / species affected

Main hosts

show all species affected
Juglans regia (walnut)
Malus domestica (apple)
Malus sylvestris (crab-apple tree)
Prunus (stone fruit)
Prunus americana (American plum)
Prunus avium (sweet cherry)
Prunus domestica (plum)
Prunus persica (peach)
Pyrus (pears)
Pyrus communis (European pear)

List of symptoms / signs

Fruit - reduced size
Stems - distortion
Stems - external feeding
Whole plant - external feeding

Symptoms

E. leperii causes pitting of the young stems of pear and apple (Kosztarab, 1990; Gill, 1997), and plum. Heavy infestations cause distortion and death of branches, especially on pear and plum (Kosztarab, 1996). At the feeding sites of E. leperii plant tissue stops growing, making the branches become deformed so that they break easily at these points (Kosztarab and Kozár, 1988).

Prevention and control

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

Impact

E. leperii causes pitting of the young stems of pear and apple (Gill, 1997), and plum. It was listed as a pest of deciduous fruit trees of world importance but especially as an important pest of pear and plums by Kosztarab and Kozár (1988) and Kozár (1990) and on pear and cherry in Turkey (Kozár et al., 1979). Danzig and Pellizzari (1998) describe E. leperii as a dangerous pest in the Palaearctic region, and it is an economically important pest of pear and plum in France (Bianchi and Bénassy, 1979; Foldi, 2001), and of plum in Italy (Bassi, 1994). It was regarded as one of the most important pests of apple in the southern USSR (Konstantinova, 1976). In Hungary, E. leperii is one of the most important scale insect pests of ornamental trees and shrubs (Ripka, 1999). In California, USA, it is not particularly injurious except on walnut trees with heavy lichen growth, where large populations weaken trees and reduce nut size and yield (Gill, 1997). Argyriou (1990) lists it as damaging to olive in Greece, Spain, Algeria, Morocco, Turkey, and in Italy (where it has been seriously damaging). The importance of E. leperii has increased proportionately to the decrease in the density of Diaspidiotus perniciosus in Central Europe (Kozár and Viktorin, 1978).