Common crops affected
What is it?
Fire blight is caused by the bacterium Erwinia amylovora. It overwinters in cankers and spreads in spring during bloom, when warm, wet weather and insects move the bacteria into open flowers. From there it moves into shoots, branches, and the main structure, killing tissue as it goes.
How to identify it
- Blackened, scorched-looking shoots, leaves, and blossoms that stay attached
- Shoot tips that wilt and bend into a shepherd's crook
- Oozing droplets of bacteria on infected tissue in humid weather
- Sunken, dark cankers on branches and trunk
Damage and how it spreads
Fire blight can kill blossoms, shoots, branches, and even whole young trees, and it spreads fastest during warm, wet bloom. Infected cankers harbor the bacteria into the next season. Because there is no cure once tissue is infected, prevention during bloom plus aggressive pruning of infected wood is the core of management.
How to control it
- Prune out infected wood well below visible symptoms, disinfecting tools between cuts.
- Remove cankers in winter to reduce overwintering bacteria.
- Avoid excess nitrogen and heavy succulent growth, which is more susceptible.
- Protect during the bloom infection window 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 fire blight program during the high-risk bloom period, alongside the essential cultural controls. Note that fire blight is bacterial and cannot be cured once tissue is infected — the priorities are prevention during bloom and prompt removal of infected wood. Disinfect tools and prune well below symptoms.
| Role | Product | Use |
|---|---|---|
| Primary control | Spore Control | Broad-spectrum protective fungicide |
| Companion / broader pressure | Armour Boost | Silica for tissue resilience |
Preventing it next season
Prune out cankers in winter, avoid excess nitrogen, disinfect tools, and protect during warm, wet bloom. Balanced, unstressed growth is less susceptible — support firm tissue with Armour Boost.
Claims and product availability vary by jurisdiction. Always read and follow the product label.