DiseaseHigh Severity

Pestalotia (Oak Decline Complex)

Pestalotia macrosporum

A fungal pathogen that contributes to Oak Decline Complex, working alongside multiple other fungi including Botryodiplodia, Fusarium, and Diplodia species. This soilborne pathogen primarily infects through roots, causing progressive vascular damage and tree decline.

Peak Season: Most problematic during drought conditions with soil moisture below 60% field capacity and air temperatures above 60°F. Root damage from construction or compaction increases susceptibility.
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Oak wilt symptoms showing crown thinning and vascular damage typical of Oak Decline Complex diseases

Identification & Symptoms

What to Look For

Initial discoloration of leaf margins
Interveinal yellowing progressing to total leaf yellowing
Stunting and slow to quick wilting symptoms
Dieback evident first in upper crown areas
Individual branches develop thinner foliage
Progressive thinning of entire crown
Vascular discoloration from red-brown to black-blue

Potential Damage

Vascular system disruption in twigs and root crown
Progressive crown thinning and branch mortality
Tree death can occur in 2-3 months in severe cases
Gradual decline over 3-8 years in chronic infections
Root system damage and dysfunction
Economic loss in urban and forest settings

Lifecycle

Primarily soilborne fungus that infects through root systems. Some fungi in the complex may establish as twig-canker inciters. Falling branches and twigs can introduce fungus to root areas. Disease progression varies from rapid (2-3 months) to gradual (3-8 years).

Professional Treatment Approach

1

Apply systemic fungicides like Fungisol for vascular protection

2

Improve soil drainage and reduce compaction around trees

3

Maintain adequate soil moisture during drought periods

4

Remove and destroy infected branches and debris

5

Professional diagnosis required to identify specific fungi involved

6

Early treatment with Arborfos to improve tree vigor and resistance

Recommended Mauget Products

Fungisol

Professional-grade treatment specifically effective against pestalotia (oak decline complex).

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Arborfos

Professional-grade treatment specifically effective against pestalotia (oak decline complex).

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Mycoject Ultra

Professional-grade treatment specifically effective against pestalotia (oak decline complex).

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