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Downy mildew, caused by Plasmopara viticola, is a major fungal disease of grapevines that originates from North America. This disease was first detected in a commercial Western Australian vineyard in October 1998 and has since been found in most grape growing areas within the State. It is found in all other grape growing areas of Australia.
Plasmopara viticola is specific to grapevines (e.g. Vitis vinifera), although not all Vitis spp. are susceptible. The American rootstock species and hybrids are less susceptible or are resistant (refer to ‘Varietal susceptibility’). Other species of downy mildew, such as those found on cucurbits and roses, do not attack grapevines. Although, weather conditions that favour the development and spread of grapevine downy mildew also may encourage the development and spread of cucurbit and rose downy mildews.
Department of Agriculture and Food, Western Australia
Downy mildew diseases, Plasmopara viticola, Grapes diseases and pests Australia
Agriculture | Food Science | Microbiology | Plant Sciences
Fisher, D, Taylor, A, Gordon, C, and Magarey, P. (2007), Downy mildew in vineyards. Department of Agriculture and Food, Western Australia. Bulletin 4708, 20p.