Phylloxera quercus Boyer de Fonscolombe, 1834
on evergreen oaks
primary host plants
Fagaceae, narrowly monophagous
Quercus ilex.
on deciduous oaks
Quercus pubescens, France, dép. Haute-Garonne, Avignonet-Lauragais, 28.vi.2017 © Catherine Reymonet
detail of the underside
aphids
gall
tiny (< 1 mm) orange-yellow aphids on the underside of a leaf; each causes a yellow necrotic spot at underside and upperside. Some animals deposit large numbers of shining yellow eggs in a double concentric circle.
secondary host plants
Fagaceae, narrowly monophagous
Quercus cerris, coccifera, frainetto, petraea, pubescens, robur.
notes
south-european species; records of Ph. quercus from more northern Europe most probably are erroneous.
references
Barbagallo, Binazzi, Pennacchio & Pollini (2011a), Barbagallo & Massimino Cocuzza (2014a), Barson & Carter (1972a), Blackman & Eastop (2014), Braggion (2013a), Buhr (1965a), Houard (1908a), Hrnčić, Radonjić & Perović (2017a), Laamari (2016a), Meliá Masiá (1986a), Redfern & Shirley (2011a), Roques, Cleary, Matsiakh & Eschem (2017a).