Bremia lactucae Regel, 1843

on Asteraceae

Crepis capillaris, Belgium, prov.Antwerp, Balen, Griesbroek © Carina Van Steenwinkel

infected leaf, upperside

onderzijde

ultimate branchings of the conidiophore

conidia

Cirsium oleraceum, Belgium, prov. Antwerp, Mol, de Maat © Carina Van Steenwinkel

conidiophore (congo red staining)

detail

gall

Yellowish spots on the upperside of the leaves, corresponding with a thin whitish hypophyllous fungal bloom at the underside, consisting of erect, apically multiple branched conidiophores. Each ultimate branch ends in a swelling with four short stalks, each one bearing an almost globular conidium.

host plants

Asteraceae, broadly oligophagous

Amberboa moschata; Ammobium alatum; Andryala integrifolia; Aposeris foetida; Arctium lappa, minus, tomentosum; Arctotheca calendula; Arctotis perfoliata; Callistephus chinensis; Carduus acanthoides, crispsus, defloratus, nutans & subsp. leiophyllus, personata; Carlina acaulis, vulgaris; Carthamus tinctorius; Centaurea borysthenica, jacea, nemoralis, phrygia subsp. pseudophrygia, scabiosa & subsp. fritschii; Chrysanthemum; Cichorium endivia, intybus; Cirsium arvense, oleraceum, palustre, vulgare; Coreopsis grandiflora; Cotula barbata, turbinata; Crepis biennis, capillaris, conyzifolia, mollis, paludosa, praemorsa, pulchra, pyrenaica, sancta, tectorum, vesicaria subsp. taraxacifolia; Cyanus montanus, segetum; Cynara cardunculus, scolymus; Dimorphotheca pluvialis, sinuata; Echinops sphaerocephalus; Gaillardia amblyodon, aristata, x grandiflora, pulchella; Gazania; Helichrysum macranthum; Hieracium amplexicaule, lachenalii, laevigatum, murorum, sabaudum, umbellatum; Hypochaeris glabra, radicata; Ismelia carinata; Jurinea alata; Lactuca alpina, muralis, perennis, quercina, sativa, serriola, virosa; Leontodon hispidus & subsp. hastilis, saxatilis; Ligularia sibirica; Monoculus hyoseroides; Moscharia pinnatifida; Onopordum acanthium; Osteospermum ecklonis; Pericallis hybrida; Picris hieracioides; Pilosella aurantiaca, caespitosa, cymosa, officinarum, piloselloides, ziziana; Polycalymma stuartii; Rhagadiolus stellatus; Rhaponticum scariosum; Rhodanthe manglesii; Scorzoneroides autumnalis, helvetica;Solidago virgaurea; Tanacetum vulgare; Tephroseris; Xanthium; Xeranthemum; Xerochrysum bracteatum.

references

Blumer (1946a), Brandenburger (1985a: 685), Buhr (1964b), Chater, Woods, Stringer, ao (2020a), Choi & Thines (2015a), Dietrich (2013a), Doppelbaur (1973a), Doppelbaur, Huber & Poelt (1965a), Ellis & Elis (1997a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, Voglmayr, Riethmüller, Weiß & Oberwinkler (2003a), Hafelner (198a), Jage, Klenke, Kruse ao (2016a, 20017a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Kruse ao (2022b), Kruse, Thiel, Beenken ao (2018d), Losa España (1942a, 1944a), Melgarejo Nárdiz, García-Jiménez, Jordá Gutiérrez ao (2010a), Müller (2015a), Müller & Kokeš (2008a), Mułenko, Kozłowska, Bacigálová ao (2014a), Mułenko, Sałata & Wołczańska (1995a), Negrean (1995a, 1996b), Negrean, Constantinescu & Denchev (2004a), Petrak (1957a), Porta-Puglia & Mifsud (2006a), Riethmüller, Voglmayr, Göker, Weiß & Oberwinkler (2002a), Ruszkiewicz-Michalska (2006a), Ruszkiewicz-Michalska & Michalski (2005a), Scheuer & Bechter (2012a), Thines, Runge, Telle & Voglmayr (2010a), Voglmayr & Constantinescu (2008).