Phragmites australis, Bierum, Laag Watum: light infestation © Arnold Grosscurt

Phragmites australis, Vlaardingen, Riertputten: heavy infestation; © Ben van As

Phragmites australis, Oud-Loosdrecht

transverse section, after removal of the outermost leaf sheath

thransverse section through a rolled in and galled part of a leaf

to the left, below, between the extremely enlarged epidermis cells a cavity can be seen with (vagely!) a mite, and three egss

Phragmites australis, Zeewolde, Wilgenreservaat: for comparison at right two galls of Lipara lucens (photo eind maart); © Arnold Grosscurt

detail

Phragmites australis, Dronten, Roggebotzand, 23.viii.2019 © Arnold Grosscurt: opened gall

detail

gall

The galing consists of an extreme enlargement of the epidermal cells of the inside and/or outside of the more inner leaf sheats, rarely also of a strip of the leaf blade.

hostplants

Poaceae, monophagous

Phragmites australis.

synonyms

Tarsonemus phragmitidis.

predators

Lestodiplosis tarsonemi.

references

Abraham & Carstensen (1982a), Baetens & De Bruyn (1999a), Bellmann (2012a), Buhr (1965a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Houard (1908a), Koops (2013a), Lambinon Schneider & Feitz (2012a), Redfern & Shirley (2011a), Roskam (2009a), Schwarzländer & Häfliger (2000a), Skuhravá, Skuhravý & Meyer (2014a), Tomasi (2014a), Weidner (1954a).