SESAMUM :: MAJOR DISEASE :: BACTERIAL LEAF SPOT

Bacterial leaf spot - Xanthomonas campestris pv. sesami
Symptoms
Initially water-soaked spots appear on the undersurface of the leaf and then on the upper surface. They increase in size, become angular and restricted by veins and dark brown in color. Several spots coalesce together forming irregular brown patches and cause drying of leaves. The reddish brown lesions may also occur on petioles and stem.

Xanthomonas campestris pv. sesami - Symptoms

Pathogen
The bacterium is a Gram negative rod with a monotrichous flagellum.
Disease cycle
The bacterium survives in the infected plant debris and in seeds. The secondary spread is by rain water.
Management

• Remove and burn infected plant debris.
• Spray Streptomycin sulphate or oxytetracycline hydrochloride or strephocyclin at 100g/ha.