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.

synonyms

Podosphaera 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), Leysen (2017a), Mieslerová, Sedlářová, Michutová, ao (2020b), Piątek (2004a), Roskam (2009a), Ruszkiewicz-Michalska (2006a), Ruszkiewicz-Michalska & Michalski (2005a), Talgø, Sundheim, Gjærum ao (2010a).