Bacterial leaf blight

Caused by: Xanthomonas campestris
Problem Category: Bacterial Disease
Symptoms: Small, angular, yellow spots on leaves which expand into irregularly shaped, brown, water-soaked lesions with a yellow halo; centers of lesions dry out, become brittle; leaves may become curled or distorted; flower stalks may develop elongated lesions that exude a bacterial ooze; infected umbels may be blighted
Comments: Bacteria can be spread by splashing irrigation water or rain or on contaminated equipment
Management: Plant pathogen-free seed; avoid using sprinkler irrigation; apply appropriate bactericides if available
Control: Spray 10% cow urine or 6ml Fermented Buttermilk to control the blight