1 armillaria root rot i selected this because my property had many trees remove but roots where left...
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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
General information
BRE Properties, Inc.2
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
Signs & Symptoms
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Mushrooms Fully bloom
First sign can be Aug
Short weak shoots Small clusters Poor ripening Low NPK in Petiole lab tests
Signs & Symptoms
Leaves turn red Wilted leaves Early defoliation Death is normally during dormancy
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Sign & symptoms
Mushrooms – needs moisture. Doesn’t act as disease spreader
Near former diseased trees
Vine productivity slows and die 2-4 years
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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
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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 is one way of control
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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
Management – preplanting
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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
Early season
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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 not yet on market
Treatments – Sept - Nov
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.
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My question for the Final
The Armillaria fungus thrives best in what type of soil
a – Hot wet soilb – Cool moist soilc. – Dry warm soild.- Dry cool soil
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