Black Gram Disease — Blackgram D4
| Field diagnostic symptoms |
- Powdery spots/patches on leaves, petiole, stem and pods
- Diseased leaves turn black and finally shed
- Malformed pods with few ill filled seeds
- Fungus: Oidium type and ectophytic
- Condiophores - simple, erect, bear chained conidia
- Conidia - hyaline, thin walled, elliptical/ barrel shaped/ cylindrical and single cell
- Chasmothecia contain 4-8 asci and each ascus contains 3-8 ascospores
- Survival: Chasmothecia in the infected plant debris
- Primary spread: Ascospores from perennating chasmothecia
- Secondary spread: Air-borne conidia
- Rain splash
- Temperature: 22 to 26°C
- Warm humid weather
- Relative humidity: 80 – 88 %
- Severe during late kharif and rabi seasons
- Remove and destroy infected debris
- Spray NSKE @ 5% or neem oil @ 3% twice at 10 days interval
- Spray Eucalyptus leaf extract @ 10% at initiation of disease and 10 days later
- Spray any one of the following fungicides at initiation of disease and second spray at 15 days later.
