Pale Green to Yellow Spots Form on Upper Surface and Downy Growth on Lower Side of Leaves

1. Small, yellowish areas occur on the upper leaf surface. Later a more brilliant yellow color develops with the center of the lesion turning brown.
2. Usually spots are angular because they are restricted by leaf veins.
3. When leaves are wet, a downy, white-gray-light blue fungus growth can be seen on the underside of individual lesions.
4. Spores produced on the lower leaf surface are readily spread by the wind. Rainy, humid weather favors the development of downy mildew.

 Management

1. Use resistant variety.
2. Prefer crop rotation.
3. Collection of infected leaves at primary stage.

 Biological: 

1. Spraying of Recover Nutri @0.5gm/L + Geomycin @0.5gm/L
2. Spraying of Pseudomonas fluorescens +Bacillus subtilis @5g/L.