Plasmopara muralis Thines, 2011

on Parthenocissus

Parthenocissus quinquefolia<, Belgium, prov. Limbourg, Reppel, Abeekvallei, 13.viii.2021 © Carina Van Steenwinkel: early infection

underside of an infected leaf

seriously infected leaf

conidiophores (congo-red staining)

ultimate branchings

conidia

conidia; measurements (11)-16.3-(24) x (13)-26.5-(43) µm (n=23)

gall

leaves with reddish brown spots. Underside with a whitish fungal down consisting of vertical conidiophores that apically several times are branching, each branch ending upon an ovoid conidium.

host plants

Vitaceae, monophagous

Parthenocissus quinquefolia, tricuspidata.

notes

The conidia in the material illustrated here are larger than mentioned by Thines in his original description of the species, viz: (10)12.5-14(17) x (11.5)14.5-20.5(29.5) µm.

references

Duarte, Choi, Soares & Barreto (2014a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Kruse (2019a), Kruse, Thiel, Brodtbeck ao (2017a), Rouxel, Mestre, Baudoin ao (2014a), Thines (2011a).