Bacterial leaf spot (Pseudomonas syringae pv. sesami)
Light brown angular spots with dark purple margin appear in the leaf veins. Defoliation and death of plant may occur in severe leave and stem infection. Sunken and shiny spots appear on the capsules. Early capsule infection renders them black and seedless. The pathogen is seed borne. High temperature, rainfall and persistent humidity favour the disease.
- Hot water treat seeds: 10 min. at 52°C. For further information on Hot-water treatment of seeds click here
- Use white seeded varieties. They are reported to be more resistant than coloured varieties.
- Destroy crop residues.
- Use resistant varieties, if available.
- Cultivate at low humidity and temperature (change sowing date).