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Phytoptus avellanae
''Phytoptus avellanae'' is an acarine gall-mite species inducing big bud galls of up to across, sometimes slightly open, on the buds of hazel (''Corylus avellana'') and on filbert (''Corylus maxima''). Synonyms include ''Phytocoptella avellanae'', ''Eriophyes avellanae'', ''Calycophthora avellanae'', ''Phytoptus coryli'', ''Phytoptus pseudogallarum'', and ''Acarus pseudogallarum''. The mites are white, about 0.3 mm long, with numerous tergites and sternites. Two forms of ''P. avellanae'' exist, a gall causer and a vagrant form that has a more complex life-cycle and does not form galls.
Common names include - DE: Haselnussgallmilbe, Haselnuss-Knospengallmilbe, ES: Badoc del avellano, FR: Phytopte du noisetier, IT: Eriofide del nocciolo, GB: Filbert bud mite, Hazelnut gall mite, TR: Fýndýk kozalak akarý.〔
==Galls==
Hazel big bud galls are generally common, resembling the big bud gall (''Cecidophyopsis ribis'') on currants (''Ribes'' spp.), develop as a chemically induced distortion of the expanding leaf buds or female flowers on hazel shrubs, caused by the mite ''Phytoptus avellanae'', several hundred of which can live in a single gall within the 20–40 scale leaves.〔 The inner scale-leaves become thickened and distorted, developing a covering of hairs, in amongst which the mites live. Galled buds appear light green at first and turn brown later in the year. If affected the leaves or female flowers fail to develop as a result of the feeding by the gall-mites.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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