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Armillaria Root Rot
I selected this because
My property had many trees
remove but roots where left
I have seen symptoms in one
small area of Vineyard
It’s prevalent in your area of
California
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General information
It’s a fungus, loves cool moist soil
• Infects woody roots & trunk base
• Effects large variation of plants
• Difficult to stop
• Slow death of the plant
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BRE Properties, Inc.
Signs & Symptoms
 First
sign can be Aug
 Short weak shoots
 Small clusters
 Poor ripening
 Low NPK in Petiole
lab tests
Mushrooms Fully bloom
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Signs & Symptoms
 Leaves
turn red
 Wilted leaves
 Early defoliation
 Death is normally
during dormancy
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Sign & symptoms
– needs
moisture. Doesn’t act
as disease spreader
 Near former diseased
trees
 Vine productivity slows
and die 2-4 years
 Mushrooms
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Signs, Symptoms & Diagnose
Base of trunk just
under the surface.
 White Mycelial
under the bark near
 Light brown spongy
wood

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-
Signs, Symptoms & Diagnose
 rhizomorphs
very rare in vines
 Can spread to vine planted near
diseased areas under ground
 Will decrease in severity as
move away from infected center
 This
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is one way of control
Disease cycle

Fungus is present in soil as part of
old tree roots & stumps

Vine roots come in contact with
infected area

These are colonized and become
inoculum and released as spores

Vine tissues are attacked and
spreads to root collar

Trunk is girdled and eventually
incapable of supporting vine
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Management – preplanting
 Avoiding
land with
history of trees or
disease
 Ripping and removal
of roots
 Fumigation chemicals
 Stay updated via
UCDavis options
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Management post plant
Several options
 ID
the smaller
infected area
and don’t plant
 Keep
area dry,
drips lines
 Monitor and
know your land
history
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Early season
 In
spring clear soil
around base of vine
expose upper roots
to air out and dry
12-16 inches.
 This can be very
effective and can be
perminate if done
early life of vine
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More on Controls
Success of chemicals is dependent on drainage,
site slope and site orientation…. Dry soil
Best done before planting or in dormant season
Biological Microbial control is showing promise in
the form of a bacterial strain that inhabits the
pathogen development
Resistant roots stocking is being developed, but
12 not yet on market
Treatments – Sept - Nov
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When choosing a pesticide, consider the environmental impact.
METHYL BROMIDE – see label rates
COMMENTS: Preplant treatment. May only be used under a Critical Use
Exemption. Fumigants such as methyl bromide are a source of volatile
organic compounds (VOCs) but are not reactive with other air
contaminants that form ozone: methyl bromide depletes ozone.
Fumigate only as a last resort when other management strategies have
not been successful or are not available.
METAM SODIUM - (Vapam, etc.)
COMMENTS: Apply in winter when soil moisture is high. Fumigants
such as metam sodium are a source of volatile organic compounds
(VOCs) but are minimally reactive with other air contaminants that form
ozone. Fumigate only as a last resort when other management
strategies have not been successful or are not available.
My question for the Final
 The
Armillaria fungus thrives best in what
type of soil
a – Hot wet soil
b – Cool moist soil
c. – Dry warm soil
d.- Dry cool soil
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The End
Any
questions ?
Next
15
presenter please