Bacterial Leaf Spot

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Physical Description

In peppers, raised brown spots that look like warts, sometimes appearing water-soaked

In brassicas (cabbage, broccoli, cauliflower, etc), infections start as small, dark specks on leaves. As the disease develops, numerous water-soaked leafspots appear. Leafspots remain small (0.125 inch in diameter). Older leafspots turn tan and may or may not have a purple border around them. Leafspots are visible from both the top and bottom sides of leaves.

Species & Taxonomy

  • Kingdom:
  • Phylum:
  • Class:
  • Order:
  • Family:
  • Genus Species:
    • in brassicas: Pseudomonas syringae
    • in lettuce, peppers & tomatoes: Xanthomonas campestris

Lifecycle

 

Plants Affected

 

Plants Unaffected

 

Geographical Range

 

Signs & Symptoms

Whole Plant

Leaves

Flowers

  •  

Fruit

Peppers

  • raised brown spots that look like warts, sometimes appearing water-soaked

Roots/Tubers

How to Positively Identify

 

Treatment

 

Prevention & Control

 

Cultural Controls:

Habitat:

Temperature & Humidity:

Mulching & Cultivation Practices:

  • Choose resistant varieties
  • Follow a 3-year crop rotation of tomato family crops
  • Pick off infected leaves
  • switch to drip irrigation or soaker hoses for watering
  • don’t touch the plants when wet
  • Disinfect all cages and trellises or supports with bleach water (1 part bleach : 12 parts water)

Natural Enemies & Biological Controls

Insects:

Animals:

Reptiles:

Barriers

Traps

Sprays & Dusts

Sources:

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