Does the parasite follow its host? Occurrence of morphologically barely distinguishable powdery mildew anamorphs on Oenothera spp. in different parts of the world

Australia: A Continent Without Native Powdery Mildews? The First Comprehensive Catalog Indicates Recent Introductions and Multiple Host Range Expansion Events, and Leads to the Re-discovery of Salmonomyces as a New Lineage of the Erysiphales

“…This powdery mildew is a well-known pathogen of oaks ( Quercus spp. ), and has also been found on other woody hosts such as mango ( Mangifera indica ), and on herbaceous hosts, such as Oenothera spp., in different parts of the world (Limkaisang et al, 2006 ; Takamatsu et al, 2007 , 2015a ; Bereczky et al, 2015 ; Desprez-Loustau et al, 2017 , 2018 ). In Australia, E. alphitoides was detected earlier on Quercus spp.…”

“…9.9) is an established and useful tool to overcome problems in the genetic characterization of ascomycete species, including powdery mildews, when type specimens cannot be used for genetic analyses due to their age, state of conservation, or sparseness. Furthermore, many plant species, and even single leaves of the same host plants, are sometimes infected with more than one powdery mildew species (Chen et al, 2008 ; Kiss et al, 2008 ; Krístková et al, 2009 ), and these could be morphologically indistinguishable (Takamatsu et al, 2002 ; Jankovics et al, 2008 ; Bereczky et al, 2015 ; Desprez-Loustau et al, 2018 ). Such mixed infections may complicate the identification of powdery mildews.…”

“…However, some of these records are doubtful as the original identifications were presumptive, being based only on the morphology of the asexual morph, in the absence of the sexual morphs, and/or plant disease lists from overseas. It is difficult, and sometimes impossible, to distinguish powdery mildew species belonging to the same genus by morphological characteristics of the asexual morph (Takamatsu et al, 2002 ; Jankovics et al, 2008 ; Bereczky et al, 2015 ; Desprez-Loustau et al, 2018 ).…”

Morphological, molecular phylogenetic and pathogenic analyses of Erysiphe spp. causing powdery mildew on cashew plants in Brazil

“…The first references to this group of diseases are from past centuries; consequently, their taxonomy became unclear with the advent of techniques using molecular and phylogenetic systematics. It has been found from molecular genetic studies that the original descriptions based on morphological characters sometimes have no taxonomic consistency, because molecular analyses reveal that cryptic species are genetically different from their close relatives, even when they are undistinguishable on the basis of morphology (Kiss et al ., ; Bereczky et al ., ). Therefore, molecular analysis supported by sequencing specific genome regions dramatically changed the classification of this group (Braun & Cook, ).…”

Observaciones con MEB de cinco especies de Erysiphales en plantas ornamentales y frutales en México

“…Al respecto, Braun y Cook (2012) complementaron la información de ML con estudios de MEB, lo cual permite diferenciar a los géneros y a diversas especies de anamorfos de Erysiphales, sin la necesidad de caracterizar los casmotecios del teleomorfo o estado sexual. No obstante, existen complejos de especies de Erysiphales que únicamente pueden ser identificadas o distinguidas mediante la combinación de caracterización morfológica y análisis de secuencias de ADN (Braun y Cook, 2012;Bereczky et al, 2015;Scholler et al, 2016;Pastirčáková et al, 2016;Bradshaw et al, 2017). Existen algunos estudios previos (Félix-Gastélum et al, 2005, 2011, 2013, 2014Domínguez-Serrano et al, 2016;Tovar-Pedraza et al, 2016;Camacho-Tapia et al, 2018) en los cuales se analizaron las características morfológicas de especies de Erysiphales presentes en México usando MEB.…”