Powdery Mildew of Grapes

Uncinula necator

Oidium tuckeri

Description:

A fungal disease that causes grey spots of powdery growth on leaves, shoots, flowers and berries. Dark web like markings can often be seen when the powdery coating is rubbed off. Infection of young leaves may lead to distortion and shrivelling. Fruit may split and dark varieties may have uneven colouring.

Species Affected:

Grapes

Biology:

Favoured by warm humid wether in spring and summer.
Infection of flowers results in poor fruit set.

Life Cycle:

Origin and History:

Distribution:

Significance:

Management and Control:

Apply fungicides.
Reduce foliage density.

Related and Similar Species:

References:

1291

Acknowledgments:

Collated by HerbiGuide. Phone 08 98444064 or www.HerbiGuide.com.au for more information.