DOWNY MILDEW OF GRAPES | Disease Management and Symptoms

DOWNY MILDEW OF GRAPES

SYMPTOMS

                                                    

•        Small Translucent, pale Yellow spots with Indefinite borders on the upper Surface of leaves.
•          Downy growth of the fungus appears, on the under Surface of leaves & directly under the Spot.
•          Later, Infected Areas are killed and turn brown.
•          Growth on lower Surface becomes dirty grey.
•          Resulting in defoliation of leaves, Soot remains stunted in growth.
•          Flowers & Berries are also Affected.
•          Flowers may blight or rot.
•          Berries become leathery & wrinkle, Developed a reddish marbling to brown colouration.
•         Fruits shed, juice quality & yield is reduced.

                                   EPIDEMIOLOGY-:

• Disease development Favoured- Rainy season with heavy dew, RH- above 80% & temp-23°-27°С.

                                      Management-:

•          Sanitation is very Important, remove & burn all diseased leaves, shoots, flowers & berries.
•          After pruning, the vines should be sprayed with Bordeaux mixture 1% or Difolatan 0.2% or Chlorothalonil 0.2% or COC 50wp 2.5-3gm or Copper hydroxide 1.25-1.5 gm/ Lit.
•          When the flushes are formed, spraying the difolatan 0.2% or Chorothalonil 0.2% or metalaxy 10.2% is effective.
•          Repeat the spray at weekly Intervals.

Published by

                      Shubham S. Malode  

(B.Sc Agriculture Biotechnology)