Urocystis violae (Sowerby) Fischer von Waldheim, 1867

on Viola

Urocystis violae gall on Viola spec.

Viola spec., Albanië, prov. Shkodër, Theth, vii.2017 © Cor Zonneveld

gall

the petioles, also other parts of the plant, disfigured by up to several cm long blisters that contain a blackish-brown mass of spore balls. The spore balls consist of 3-20 spores, wrapped in a continuous layer of yellowish sterile cells.

host plants

Violaceae, monophagous

Viola alba, alba x hirta, ambigua, biflora, canina, collina, cornuta, elatior x pumila, hirta, hirta x suavis, lutea, mirabilis, odorata, pumila, reichenbachiana, riviniana, stagnina, suavis.

references

Ainsworth & Sampson (1950a), Almaraz (1998a), Buhr (1965a), Chinery (2011a), Dauphin & Aniotsbehere (1997a), Ellis & Ellis (1997a), Klenke & Scholler (2015a), Lutz & Vánky (2009a), Redfern & Shirley (2011a), Roskam (2009a), Savchenko & Heluta (2012a), Tomasi (2014a), Vanderweyen & Fraiture (2014a), Vánky (1994a), Vánky & Abbasi (2013a).