Paraperonospora minor (Savulescu & Rayss) Constantinescu, 1989

on Achillea, Artemisia

gall

spots epiphyllous, pale, brown when tissues become necrotic, polyangular. Down hypophyllous, whitish or yellowish, in patches, sometimes powdery, covering large, vein-limited areas or the entire lower surface, but often obscured by the trichoma. Conidia oval, 25-30 µm lang; tip of terminal branchlets of the conidiophore blunt but not swollen.

hostplants

Asteraceae, oligofaag

Achillea clusiana; Artemisia clusiana, siversiana, vulgaris.

Outside of Europe also Dendranthema boreale, Nipponanthmum nipponicum

synonyms

Peronospora sulphurea f. minor Savulescu & Rayss, 1930.

references

Choi, Park & Shin (2008a), Constaninescu (1984a, 1996a), Săvulescu (1948a).

mod 30.viii.2017