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Kaolin particle film limits grapevine downy mildew epidemic under open‐field conditions and stimulates the plant defence response

Kaolin particle film limits grapevine downy mildew epidemic under open‐field conditions and... IntroductionDowny mildew, caused by the obligate biotrophic oomycete [Plasmopara viticola (Berk and Curt.) Berlese and de Toni] (Göker et al. 2007), is one of the most serious threats to viticulture. The pathogen attacks all green parts of the grapevine and spreads rapidly during a single season in humid climate conditions.In the field, once exposed to water, over‐wintered oospores mature and germinate rapidly to form sporangia and then zoospores are released. Swarming zoospores attach to stomata and encyst. Germ tubes are formed, followed by development of intercellular mycelia. After an incubation period, sporangiophores emerge through the stomatum and form sporangia on the abaxial leaf surface (Gindro et al. 2003). New zoospores are released and can spread to a new host organism through wind and rain, forming a cycle of secondary infection (Kiefer et al. 2002). Secondary infection can continue multiple times throughout the grapegrowing season under favourable weather conditions.Most widely cultivated Vitis vinifera cultivars are susceptible to downy mildew, causing great economic loss, especially in vineyards with rainy springs (Delmotte et al. 2006). The control of downy mildew is challenging. The most effective treatment currently available is the use of fungicides. Fungicide resistance, however, continuously develops in response to the long‐term application of chemical http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Australian Journal of Grape and Wine Research Wiley

Kaolin particle film limits grapevine downy mildew epidemic under open‐field conditions and stimulates the plant defence response

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References (79)

Publisher
Wiley
Copyright
© 2022 Australian Society of Viticulture and Oenology Inc.
ISSN
1322-7130
eISSN
1755-0238
DOI
10.1111/ajgw.12558
Publisher site
See Article on Publisher Site

Abstract

IntroductionDowny mildew, caused by the obligate biotrophic oomycete [Plasmopara viticola (Berk and Curt.) Berlese and de Toni] (Göker et al. 2007), is one of the most serious threats to viticulture. The pathogen attacks all green parts of the grapevine and spreads rapidly during a single season in humid climate conditions.In the field, once exposed to water, over‐wintered oospores mature and germinate rapidly to form sporangia and then zoospores are released. Swarming zoospores attach to stomata and encyst. Germ tubes are formed, followed by development of intercellular mycelia. After an incubation period, sporangiophores emerge through the stomatum and form sporangia on the abaxial leaf surface (Gindro et al. 2003). New zoospores are released and can spread to a new host organism through wind and rain, forming a cycle of secondary infection (Kiefer et al. 2002). Secondary infection can continue multiple times throughout the grapegrowing season under favourable weather conditions.Most widely cultivated Vitis vinifera cultivars are susceptible to downy mildew, causing great economic loss, especially in vineyards with rainy springs (Delmotte et al. 2006). The control of downy mildew is challenging. The most effective treatment currently available is the use of fungicides. Fungicide resistance, however, continuously develops in response to the long‐term application of chemical

Journal

Australian Journal of Grape and Wine ResearchWiley

Published: Oct 1, 2022

Keywords: defence response; disease epidemic; plant protection; Plasmopara viticola; Vitis vinifera

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