DiseaseHigh Severity

Fire Blight

Erwinia amylovora (bacterium)

A devastating bacterial disease affecting many species in the rose family. Infected areas appear water-soaked initially, then quickly turn brown to black as if burned by fire. The disease can progress rapidly and kill entire branches or trees if left untreated.

Peak Season: Most active in cool, wet spring weather during bloom period, with symptoms appearing in late spring
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Fire blight damage showing characteristic blackened, burned appearance of infected shoots

Identification & Symptoms

What to Look For

Blossoms, young leaves, and shoots suddenly wilt in late spring
Infected areas first appear water-soaked, then turn brown to black
Areas appear as if burned by fire (hence the name)
Infection progresses down shoots and branches
Inner bark becomes water-soaked, turning green to brown
Surface bark withers and wrinkles
Milky ooze appears on infected bark in warm, wet weather
Dead leaves remain attached to dead branches
Cankers may girdle branches or main trunk

Potential Damage

Sudden wilting and death of blossoms and shoots
Progressive branch death from tip dieback
Cankers that can girdle and kill entire branches
Potential death of entire tree if trunk is girdled
Reduced fruit production in fruit trees
Aesthetic damage to ornamental plantings

Lifecycle

Bacterium overwinters at edges of cankers and on blighted twigs. Becomes active during warm spring rains, producing ooze that attracts insects which carry the pathogen to healthy trees. Bacteria enter through wounds, natural openings, or flower parts. Infections enlarge until spring growth stops about one month after blossoming. Bacteria remain dormant in late summer until the following spring.

Professional Treatment Approach

1

Early detection and removal of infected branches during dormant season

2

Sterilize pruning tools between cuts with 70% alcohol

3

Avoid overhead irrigation and excessive nitrogen fertilization

4

Apply preventive bactericide sprays during bloom period

5

Professional assessment for systemic treatment options

6

Remove infected nursery stock and avoid planting in wet areas

Recommended Mauget Products

Professional bactericide applications

Professional-grade treatment specifically effective against fire blight.

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Copper-based sprays for prevention

Professional-grade treatment specifically effective against fire blight.

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