Plant Parasites of Europe

leafminers, galls and fungi

Erysiphe russellii

Erysiphe russellii (Clinton) Braun & Takamatsu, 2000

on Averrhoa, Oxalis

Erysiphe russellii on Oxalis stricta

Oxalis stricta, Belgium, prov. Antwerp, Herselt, Langdonken, 7.ix.2020 © Carina Van Steenwinkel

Erysiphe russellii on Oxalis stricta

infected leaf

Erysiphe russellii on Oxalis stricta

same leaf, underside

Erysiphe russellii on Oxalis stricta

also the fruiting peduncle is affected

Erysiphe russellii on Oxalis stricta

conidiophores

Erysiphe russellii on Oxalis stricta

conidium

Erysiphe russellii on Oxalis stricta

cleistothecium with appendage and extruded asci

Erysiphe russellii on Oxalis stricta

asci

Erysiphe russellii on Oxalis stricta

ascus

Erysiphe russellii on Oxalis stricta

detail of the appendages

Erysiphe russellii on Oxalis stricta

only in a minority the appendages were terminally branched

gall

mycelium amphigenous, sometimes also in the inflorescence. Appressoria more or less lobed, single or paired. Conidia solitary, elliptic, without fibrosin bodies. Cleistothecia with 4-10 asci, that contain 3-5 spores. Appendage 5-15, attached to the equator, 2-7 times the diameter; they are septate, brown, flexuous, near the tip 1-4 x times loosely dichotomously branched.

host plants

Oxalidaceae, oligophagous

Averrhoa carambola; Oxalis corniculata, dillenii, fontana, rosea, stricta.

synonyms

Microsphaera russellii Clinton, 1874.

references

Beenken & Senn-Irlet (2016a), Braun (1995a), Braun & Cook (2012a), Bresinsky (2016a), Czerniawska (2001a), Jage, Klenke & Kummer (2010a), Klenke & Scholler (1995a), Kozłowska, Mułenko & Heluta (2015a), Negrean & Anastasiu (2006a), Ruszkiewicz-Michalska (2006a), Ruszkiewicz-Michalska & Michalski (2005a).

Last modified 9.ix.2020