Plant Parasites of Europe

leafminers, galls and fungi

Podosphaera clandestina

Podosphaera clandestina (Wallroth) Léveillé, 1851

on woody Rosaceae

Podosphaera clandestina on Crataegus monogyna

Crataegus monogyna, Amstelveen, Schinkelbos

gall

mycelium amphigenous, often also on stem, forming a thin white film. The fungus may cause galling and reddening of young shoots. Appressoria poorly developed to nipple-shaped. Conidia short-oval, formed in chains, with fibrosin bodies. Cleistothecia with a single ascus, containing 6-8 spores. Appendages 6-12, equatorial or somewhat above, 1-2 x the diameter; they are stiff, almost straight, largely brown; at the very tip they are several times dichotomously branching in quick succession.

host plants

Rosaceae, oligophagous

Crataegus azarolus, coccinea, crus-galli, laevigata, macrocarpa, meyerei, monogyna, orientalis, pallasii, pentagyna, pseudoheterophylla, rhipidophylla, sanguinea; Cydonia oblonga; Mespilus germanica, punctata; ? Prunus padus; Pyrus communis; Spiraea douglasii, japonica, salicifolia, x semperflorens, x vanhouttei.

According to Ellis & Ellis also on Pyracantha coccinea.

P. oxyacanthae (de Candolle) de Bary, 1870.

references

Blumer (1967a), Brandenburger (1985a), Braun (1995a), Braun & Cook (2012a), Bresinsky (2016a), Buhr (1964b), Czerniawska, Madej, Adamska ao (2000a), Ellis & Ellis (1997a), Jage, Klenke, Kruse ao (2016a), Jage, Klenke & Kummer (2010a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Kruse & Jage (2014a), Piątek (2004a), Roskam (2009a), Ruszkiewicz-Michalska (2006a), Ruszkiewicz-Michalska & Michalski (2005a), Talgø, Sundheim, Gjærum ao (2010a).

Last modified 6.viii.2020