DiseaseHigh Severity

Palm Bud Rot

Penicillium vermoeseni

A serious fungal disease affecting palm trees, particularly in coastal areas of central and southern California. This pathogen attacks the terminal bud and crown area, causing progressive rot that leads to tree death. Favored by cool, foggy weather conditions.

Peak Season: Most active during cool, foggy weather conditions. Once established, infection continues year-round. Higher incidence in coastal fog zones.
Penicillium vermoeseni infection showing characteristic fungal rot symptoms and tissue damage typical of this pathogen

Identification & Symptoms

What to Look For

Dying of terminal buds in crown area
Leafstalk bases become rotten and discolored
Progressive decay spreading through crown whorls
Blackening and collapse of new growth
Eventual death of entire palm tree
Foul odor from rotting tissue

Potential Damage

Terminal bud death preventing new growth
Progressive rot of crown and leafstalks
Complete tree mortality if untreated
Rapid spread to nearby palm trees
Continuous infection throughout the year once established
Economic loss in landscape and commercial palm plantings

Lifecycle

Spreads through conidiospores that move throughout crown whorls until all leafstalks are infected. Once infection is established, it continues throughout the year. Cool, foggy weather conditions favor disease development and spread.

Professional Treatment Approach

1

Apply preventive fungicide treatments like Fungisol before symptoms appear

2

Remove and destroy infected palm material immediately

3

Improve air circulation around palm crowns

4

Avoid overhead irrigation that promotes moisture retention

5

Professional diagnosis essential for proper identification

6

Systemic treatments may help early-stage infections but advanced cases are often fatal

Recommended Mauget Products

Fungisol

Professional-grade treatment specifically effective against palm bud rot.

View Product Details

Mycoject Ultra

Professional-grade treatment specifically effective against palm bud rot.

View Product Details

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