If you’re seeing brown or black spots on leaves—often starting on lower foliage and spreading upward—leaf spot may be the cause.
Overview
Leaf spot is a common plant disease
It causes visible spots on leaves and gradual decline
It spreads through water, contact, and plant debris
Common Signs
Small brown, black, or tan spots on leaves
Spots may have yellow halos
Leaves may yellow and drop early
Often Confused With
Blight
→ faster spread and larger dead areas
Bacterial spot
→ smaller spots, often water-soaked
Leaf spot spreads more slowly and stays as defined spots
Plants Commonly Affected
Tomatoes
Peppers
Beans
Roses and ornamentals
Occurrence
More common in warm, humid conditions
Spreads through rain, watering, and splashing soil
Often starts on lower leaves
Fast Control (Start Here)
Remove affected leaves early
Keep foliage dry
Mulch to prevent soil splash
Monitor plants to prevent spread
Which Treatment Should You Use?
For early signs
→ Remove affected leaves and improve conditions
For ongoing risk
→ Use preventative fungicide if needed
For widespread spotting
→ Focus on removing infected foliage
Do not rely on treatment alone
Instructions
Immediate Action
Remove spotted leaves while dry
Dispose of infected material
Clean tools after handling plants
Environmental Control
Water at the soil line
Avoid overhead watering
Space plants for airflow
Prevention
Space plants properly
Water at the soil line
Use mulch to prevent soil splash
Remove lower leaves touching soil
Remove plant debris at end of season
Sanitize tools and supports
When to Remove Plants
Mild infection
Remove affected leaves
Monitor closely
Severe infection
If most leaves are affected, consider removing the plant
If You Pull Plants: Compost or Trash?
Do not compost heavily infected plants
Bag and trash infected material
Can You Plant Again in the Same Space?
Yes, with precautions
Remove debris and improve conditions
Rotate crops if disease was severe
Gardener’s Notes
Leaf spot is common and often manageable
Early removal slows spread
Watering habits are a major factor
Key Takeaway
Remove infected leaves early
Keep foliage dry
Prevent soil splash
Stay consistent with cleanup
