DOCTOR UMAR REHMAN

1. Diseases of Grapes
Vitis Vinifera

2. Fungal Diseases
1.Downy Mildew; Plasmopara Viticola
2.Powdery mildew;Unicnula Nectator
3.Anthranose; Alsinoe Ampelina
4.Brown Spot; Cercospora Viticola
5.Blue Mould; Pencillium Digitatum

3. Downy Mildew
Plasmopara Viticola

5. Symptoms
• Initial irregular,translucent spots appear on the
surface of leaves
• The lower surface of leaves show white powdery
growth of fungus
• The infected leaves turns brown resulting premature
defoliation
• White fungus growth appears on grapes and grapes
wrinkle and shows reddish brown discolouration
• The infected fruits becomes mummified later

6. Mode of spread and survival
• The sporangia of fungus spread through wind,rain
etc.
• Fungus survivesas spores infected leaves,shoots
and grapes
• The dominanat mycellium survivies in twigs

7. Epidemology
Disease development is favoured durning;
• Heavy Dew
• Relative Humidity 80-100%
• Temperature 23-27o'C

8. Management
• Spray Bordeaux mixture 1% OR
• Metalaxyl+Mancozeb .3 to .4% OR
• Difolation .25% OR
• chlorothalonil .2%

9. Powdery Mildew
Uncinula Necator

11. Symptoms
• Powdery Mildew mostly appears on upper surface
of leaves
• Floral infection results in shedding of flowers and
poor fruit set
• powdery growth on older grapes and infection
results in severe cracking of grapes

12. Mode of spread and survival
• The fungus spreads through air borne conidia

13. Epidemology
• Warm condition with sultry weather is favourable
for disease development
• Heavy rain has an adverse effect on disease
development

14. Management
• Proper pruning should be followed
• Spraying wettable Sulfur .2%
• OR
• carbendazim.1 %
• Dinorcap effectively controls disease

15. Blue Mould Rot
Pencillium Digitatum

16. Symptoms
• Decay the Grapes
• Infected tissues becomes soft and watery
• Infected Grapes emits a mouldy flavour

17. Management
• Avoiding injuries to the ripe Grapes helps to reduce
Rot
• Funicide application at shoot extension and later if
temperatures are cool
• Sulphur is used to reduce the new infections in
early spring