Tomato Blight (Early & Late): How to Identify and Control Them Organically
Tomato Blight (Early & Late) are one of the most common garden diseases affecting home food gardens. They target Tomatoes, Potatoes, Peppers and other crops. Here's how to identify, prevent, and control tomato blight (early & late) using organic methods—no synthetic chemicals needed.
Affected Crops
How to Identify Tomato Blight (Early & Late)
Early blight: brown spots with concentric rings (target pattern) on lower leaves first.
Late blight: dark, water-soaked patches that spread rapidly in cool, wet weather. Both cause fruit rot.
Prevention Strategies
Rotate tomatoes to new beds each year.
Mulch heavily to prevent soil splash. Stake or cage plants for airflow. Water at the base, never overhead. Remove lower leaves that touch the soil. Choose resistant varieties.
Treatment and Organic Control
Remove and destroy (don't compost) infected leaves immediately.
Apply copper-based fungicide preventively. For late blight, remove severely infected plants entirely to prevent spread to neighbors' gardens. Serenade (Bacillus subtilis) provides biological control.
Organic Control Quick Reference
- Immediate action: Remove and destroy (don't compost) infected leaves immediately
- Ongoing prevention: Rotate tomatoes to new beds each year
- Monitor: Check every 2-3 days during active growing season
- Learn more: Full Organic Pest Control Guide
Understanding the Life Cycle
Early blight fungi overwinter in soil and plant debris.
Late blight spores travel on wind for miles. Both thrive in wet conditions. Late blight is the disease that caused the Irish Potato Famine.
Frequently Asked Questions
How do I get rid of tomato blight (early & late)?
Remove and destroy (don't compost) infected leaves immediately. Apply copper-based fungicide preventively. For late blight, remove severely infected plants entirely to prevent spread to neighbors' gardens. Serenade (Bacillus subtilis) provides biological control.
What causes tomato blight (early & late)?
Early blight fungi overwinter in soil and plant debris. Late blight spores travel on wind for miles. Both thrive in wet conditions. Late blight is the disease that caused the Irish Potato Famine.
How do I prevent tomato blight (early & late)?
Rotate tomatoes to new beds each year. Mulch heavily to prevent soil splash. Stake or cage plants for airflow. Water at the base, never overhead. Remove lower leaves that touch the soil. Choose resistant varieties.
What plants do tomato blight (early & late) affect?
Tomato Blight (Early & Late) commonly affect: Tomatoes, Potatoes, Peppers, Eggplant. Look for these signs: Early blight: brown spots with concentric rings (target pattern) on lower leaves first.
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