Phylloxera foae (von Heyden, 1837)
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.
Fagaceae, narrowly oligophagous
Rarely also other deciduous oaks.
Blackman & Eastop (2014), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Ripka (2011a).