DiseaseHigh Severity

Botryodiplodia and Oak Decline Complex

Multiple fungi including Botryodiplodia querci, Fusarium solani, Cephalosporium diospyri, Pestalotia macrosporum, Diplodia quercina, Phialophora sp., Dothiorella querci, Verticicladiella sp., Fusarium oxysporum, Verticillium albo-atrum

A complex of fungal pathogens causing oak decline, often following drought stress and root damage. The disease can cause rapid death in 2-3 months or gradual decline over 3-8 years. Infection typically occurs through roots from soil-borne phases of the fungi.

Peak Season: Active year-round, symptoms most evident during growing season
Botryodiplodia canker showing characteristic cankers and dieback

Identification & Symptoms

What to Look For

Initial discoloration of leaf margins
Interveinal yellowing progressing to total leaf yellowing
Stunting and slow to quick wilting
Dieback usually evident first in upper crown
Premature leaf drop (may or may not occur)
Individual branches develop thinner foliage
Progressive thinning of entire crown
Vascular discoloration from red-brown to black-blue in twigs and root crown

Potential Damage

Disrupts vascular system function
Causes progressive crown thinning and dieback
Can kill trees in 2-3 months or cause gradual death over 3-8 years
Reduces tree vigor and aesthetic value
Creates safety hazards from weakened branches
Predisposes trees to secondary pests

Lifecycle

Lethal infection generally occurs through roots from soil-borne phases of fungi. Some fungi (Botryodiplodia, Diplodia) may establish as twig-canker initiators causing slower decline. Falling branches and twigs may introduce fungus to root area, creating new infection sites.

Professional Treatment Approach

1

Improve soil drainage and reduce compaction

2

Provide supplemental watering during drought

3

Avoid root damage during construction

4

Remove infected branches promptly

5

Fungicide injection may help in early stages

6

Maintain tree health through proper care

Recommended Mauget Products

Fungisol

Professional-grade treatment specifically effective against botryodiplodia and oak decline complex.

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Tebuject 16

Professional-grade treatment specifically effective against botryodiplodia and oak decline complex.

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