Bacterial blight (Xanthomonas hortorum pv. carotae)

Symptoms

• The bacterium causes irregular brown spot on leaves, dark brown streaks on petioles and a blighting of floral parts.
• Lesions on foliage begin as small yellow spots.
• Soon the centre of the spots they become dry and brittle with an irregular halo.

Management

• Rogue out the infected plants
• Use disease free seeds.