Pathotypes and Races of Pseudoperonospora cubensis – Different Concepts of Virulence Differentiation

Host-parasite interactions between Cucurbitaceae and P. cubensis exhibit significant variation. This contribution reviews the current state of knowledge regarding characterization of P. cubensis virulence variation on the level of pathotypes (variation in host genera and species host-range) and races (variation in intraspecific level). However, our knowledge of the interactions between P. cubensis isolates and the […]

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Cucurbit Powdery Mildew Population Virulence Variation – a Complex View from a Global Perspective

Cucurbit powdery mildew (CPM) is mainly caused by two obligate ectoparasites, Golovinomyces orontii s.l. (Go) and Podosphaera xanthii (Px), that are highly variable in virulence. Various independent systems of CPM race determination and denomination have been used in recent decades. We recently developed new tools to enhance research of CPM virulence variation. Diversity models were […]

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Resistance to Fungicides in Cucurbit Powdery Mildew in Europe

One hundred cucurbit powdery mildew (CPM) isolates (41 Golovinomyces orontii s.l. [Go], 59 Podosphaera xanthii [Px]) from the Czech Republic (2012 to 2015), were screened for fungicide efficacy to the six frequently used fungicides (quinoxyfen /Atlas 500 SC/, propiconazole /Bumper 25 EC/, fenpropimorph /Corbel/, dinocap /Karathane LC/ azoxystrobin /Ortiva/) and penconazole /Topas 100 EC/). Fungicide […]

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