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“Background Oomycetes are a group of filamentous, unicellular heterokonts. They
are fungus-like in their growth form, adsorptive and parasitic lifestyles and formation of spores, but are relatively closely related to photosynthetic algae such as brown algae and diatoms [1]. Among oomycetes, also known as water molds, there are economically important pathogens that comprise severe pests, like Phytophthora infestans [2, 3] causing potato late blight, A. euteiches causing Casein kinase 1 seedling blight or legumes root rot [4], A. astaci [5], – the causative agent of crayfish plague, and several fish pathogens from the genera Aphanomyces [6], Achlya and Saprolegnia [7]. There is also at least one species with zoonotic potential, namely Pythium insidiosum – the etiologic agent of the human disease pythiosis insidiosii, which can be life-threatening [8]. The oomycetes A. astaci and Phytophthora cinnamomi are listed among the world’s 100 worst invasive species (Global Invasive Species Database: http://www.issg.org/database, alphabetical list as of November 2008).