Black Gram Powdery Mildew: Erysiphe polygoni
White powdery patches appear on leaves and other green parts which later become dull coloured. These patches gradually increase in size and become circular covering the lower
When the infection is severe, both the surfaces of the leaves are completely covered by whitish powdery growth. Severely affected parts get shrivelled and distorted.
In severe infections, foliage becomes yellow causing premature defoliation. The disease also creates forced maturity of the infected plants which results in heavy yield losses.
The pathogen has a wide host range and survives in the oidial form on various hosts in the off-season.
Secondary spread is through air-borne oidia produced in the season.
- Spray NSKE 5% or Neem oil 3% twice at 10 days interval from initial disease appearance.
- Spray Eucalyptus leaf extract 10% at initiation of the disease and 10 days later.
- Do Spray Carbendazim 500 g or wettable sulphur 1500g/ha or Propiconazole 500 ml/ha at the initiation of the disease and 10 days later.
- TamilNadu Agritech Portal