What Is It?

What Is It? | Facts in Depth | For the Professional Diagnostician

Brassica Diseases | Peppery Spot

Peppery Leaf Spot


  • Symptoms begin as tiny water-soaked lesions or chlorotic spots on the leaves
  • Circular spots are gray to light brown in color and sometimes have chlorotic halos
  • As disease progresses, the lesions coalesce into irregular shapes
  • Lesions are light brown in color and are confined along the leaf veins
  • Severely infected leaves dry and become brittle

Peppery leaf spot on mustard (left; center) and collard greens (right).

Favorable Environmental Conditions

  • Cool temperatures around 65°F to 75°F

Often Confused With

  • Bacterial leaf spot caused by Xanthomonas campestris pv. armoraciae
  • Black rot caused by Xanthomonas campestris pv. campestris
  • Downy mildew caused by Peronospora parasitica

Scouting Notes

  • Peppery leaf spot is most prevalent in the fall and early spring
  • Check foliage for water soaked lesions during and after periods of cool weather