Powdery Mildew of Grapes

Powdery Mildew of Grapes:-

Pathogen:- Uncinula necator

Symptoms:-

> Powdery growth mostly on the upper surface of the leaves.

> Malformation and discolouration of affected leaves.

> Discolouration of stem to dark brown.

> Floral infection results in shedding of flowers and poor fruit set.

> Early berry infection results in shedding of affected berries.

> Powdery growth is visible on older berries and the infection results in the

> Cracking of skin of the berries.

> It spread through air-borne conidia

> Through dormont mycelium and conidia present in the infected shoots and buds.

> Sultry warm conditions with dull cloudy weather, highly favourable.

Management:- Spray Inorganic sulphur 0.25 % or Chinomethionate 0.1 % or Dinocap 0.05 %.