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Chasmothecia Grapevine Berry
February / March 2023

POWDERY MILDEW in SA vineyards

SA Fruit Journal: February / March 2023

New research on the spread of grapevine powdery mildew is underway to help improve its management in the table-grape and wine industries. By Jorisna Bonthuys

Grapevine powdery mildew disease, caused by the fungus Erysiphe necator, inflicts serious economic damage in grape-growing regions across the globe. Grape yields are lower in infected vineyards, in both quality and quantity. In the case of wine grapes, the disease also affects the taste of the end product.

In 1996 Prof Francois Halleen, a specialist researcher at the Agricultural Research Council (ARC), started to track the spread of grapevine powdery mildew disease in local vineyards.

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