Plant Parasites of Europe

leafminers, galls and fungi

Venturia ditricha

Venturia ditricha (Fries) Karsten, 1873

on Betula

parasite

Leaf spots with caespituli, later pustules. Caespituli: conidia solitary, pale olivaeous, often warty, 5-9 x 15-24 µm, 1-septate. Pustules: perithecium with brown, thick-walled, ≤ 80 µm bristles; asci 9-14 x 50-68 µm, spores 4-7 x 10-17 µm.

host plants

Betulaceae, monophagous

Betula nana, pendula, pubescens.

synonyms

Fusicladium betulae Aderhold, 1896.

references

Brandenburger (1985a: 54), Fakirova (1997a), Ruszkiewicz-Michalska & Połeć (2006a), Schubert, Ritschel & Braun (2003a).

Last modified 1.ix.2022