Common crops affected
What is it?
Bacterial blights are caused by bacteria such as Pseudomonas and Xanthomonas species. They enter leaves through natural openings and wounds and spread in splashing water, on tools, and via infected seed. Warm, wet, windy conditions favor rapid spread, and the bacteria can survive in debris and seed between seasons.
How to identify it
- Small water-soaked spots that turn brown and often become angular (bounded by veins)
- Yellow halos around the spots
- Spots that merge into blighted, dead patches in wet weather
- Streaking on stems and infected, discolored seed in some crops
Damage and how it spreads
Bacterial blight reduces photosynthesis, blights foliage and pods, and downgrades or destroys yield, with seed-borne strains carrying the disease into the next crop. Because it spreads readily in wet, windy weather and survives in debris and seed, prevention and sanitation are essential — there is no cure for infected tissue.
How to control it
- Use clean, certified disease-free seed and resistant varieties where available.
- Avoid working plants when wet, and don't overhead-water.
- Rotate crops and remove and destroy infected debris.
- Protect plants during warm, wet, high-risk weather as part of an integrated program.
Recommended Vegalab solution: Spore Control
Vegalab Spore Control (Thymol) forms a protective film on plant surfaces and can support an integrated bacterial blight program, while the foundation of control is clean seed, rotation, sanitation, and avoiding leaf wetness. Bacterial diseases cannot be cured once tissue is infected, so emphasize prevention and protect during wet, high-risk periods.
| Role | Product | Use |
|---|---|---|
| Primary control | Spore Control | Broad-spectrum protective fungicide |
| Companion / broader pressure | Armour Boost | Silica for tissue resilience |
Preventing it next season
Start with clean seed and resistant varieties, rotate, avoid working wet plants, don't overhead-water, and remove infected debris. Firm, resilient tissue helps — support it with Armour Boost.
Claims and product availability vary by jurisdiction. Always read and follow the product label.