Pyrus communis © R Coutin, OPIE, Inra

gall

Around the female, up to 1.5 mm large, sessile scales a circular elevation is formed on the bark of young shoots. When the infestation is heavy the shoots obtain a knobby, irregular shape. Female scales greyish white, in the centre the brown remnants of the exuvia of the previous moults.

host plants

polyphagous on woody plants

Aesculus hippocastanum; Amelanchier alnifolia; Betula; Crataegus rhipidophylla; Juglans regia; Malus domestica; Mespilus germanica; Opuntia ficus-indica; Ostrya carpinifolia; Pistacia; Prunus avium, domestica, dulcis, persica; Pyrus communis, spinosa; Ribes nigrum; Sorbus aucuparia.

references

Blay Goicoechea (1992a), Buhr (1964a, 1965a), Çalişkan Keçe & Ulusoy (2017a), Cean, Cean & Stǎnicǎ (2012a), Gómez-Menor Ortega (1957a, 1960a, 1965a), Hellrigl (2004a), Jansen (1999a), Kozár, Guignard, Bachmann ao (1994a), Kozár & Ostafichuk (1987a), Malumphy & Kahrer (2011a), Mifsud, Mazzeo, Russo & Watson (2014a), ScaleNet (2018), Schmutterer & Hoffmann (2003a), Seljak (2010a), Tomasi (2014a).