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IntroductionPlasmopara viticola, the downy mildew of grape, is one of the three major grapevine pathogens along with grey mould (Botrytis cinerea Pers.: Fr) and powdery mildew (Erysiphe necator Schwein.). Plasmopara viticola is an obligate biotroph belonging to the Oomycetes (Peronosporales, Peronosporaceae), it colonises the Vitaceae family throughout the world and is among the most important oomycete pathogens (Kamoun et al. 2015). Zoospores of P. viticola are released either by primary sporangia produced from overwintered oospores or by sporangia derived from sporulating oil spots. The zoospores encyst and produce an infection peg which penetrates through the stomata of green grapevine tissues. The infection pegs extend in the substomatal cavity and produce a substomatal vesicle. Further progression of the infection results in the formation of intercellular hyphae and intracellular haustoria. The pathogen emerges through the stomatal or lenticel apertures to produce sporangiophores and sporangia for dispersal (Kassemeyer et al. 2015). All green tissues are susceptible to downy mildew, including leaves, petioles, inflorescences, bunches, rachis, shoots and tendrils. According to the phenology of grapevine, symptoms of P. viticola can differ, particularly on bunches. Infection on the inflorescence leads to severe epinasty (shepherd's crook) and total necrosis of the tissues. In young berries, at fruitset
Australian Journal of Grape and Wine Research – Wiley
Published: Oct 1, 2022
Keywords: berry; microscopy; ontogeny; PCR; Plasmopara viticola
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