White leaf spot (Brassica)

White leaf spot is a disease caused by the fungal pathogen Cercospora brassicicola. The fungus thrives in warm, humid conditions. It is often caused by diseased seeds or planting materials and promoted by poor air flow, low sunlight, overcrowding, improper soil nutrient and irrigation management and poor soil drainage.

Symptoms
Initial infection appears as tan or light brown spots. Spots soon coalesce and may drop out. Could be confused with spray burn.

Treatment
Remove and destroy infected plants.

Prevention
Practice crop rotation. Use diseased-free seeds or use resistant cultivars. Observe proper planting distances and maintain sanitation by removing a disposing of infected plant materials. Avoid working when plants are wet.