Managing Septoria Leaf Spot and Soil‑Borne Tomato Diseases

The Problem

Septoria leaf spot and wilts (Fusarium, Verticillium) are fungal diseases that persist in soil. Copper sprays slow spread but don't cure infected plants. Once soil is infested, diseases return yearly.

Long‑Term Solutions

1. Solarize soil: Cover with black plastic for 6–8 weeks in hot weather (ideal: fall through early spring). Heat kills pathogens.
2. Plant resistant hybrids: Look for varieties labeled V, F, N, T, A resistance. Good sources: Park Seed, Burpee, Harris Seeds, Johnny's Selected Seeds.
3. Rotate crops: Move tomatoes (and related peppers, eggplant, potatoes) to a new bed each year on a 3‑year cycle.

Seed Company Links

• Park Seed
• Burpee
• Harris Seeds
• Johnny's Selected Seeds

Bottom Line

Combine solarization, resistant varieties, and rotation to break the disease cycle.