Armillaria Root Disease

From: Steve Williams Landscape, Berkley, CA
To: Keith Giertych []
Subject: Re: Great Improvement on Japanese Maples

We treated six 30-50 year old Japanese maples that had construction damage and were suffering from Armillaria root disease. The fungus was under the bark, the bark was peeling off, and gooey resins & exudates were seeping out from the trunk - both clear signs of extreme stress. Water movement up and down the tree was completely impaired. The tops of the trees defoliated, causing more stress and making the remaining leaves turn red prematurely.

Starting in 2009, we began treating the trees with Companion Biofungicide and Essential Plus, a bio-stimulant. We lost one tree - the one that had been most badly damaged - but the other five trees experienced a remarkable turn-around. By Spring 2010 all five remaining Japanese maples leafed-out nicely, returned to more normal coloring, and looked much stronger than before. Thanks for your help with this project!

In Spring 2009, top of tree is thin and defoliated by leaf loss.
By Spring 2010, leaves have filled in nicely.
Leaf color changes in summer, prior to expected fall foliage change.
A year later, trees are healthier and have better color.
Another photo of stressed foliage prior to treatment.
Color has returned to normal and clients are pleased.
Armallaria fungus lives under bark.
Tree oozes sap, indicating extreme stress.


Growth Products Disease Program
Essential® Plus 1-0-1
1 quart per 100 gallons water
Fall - Apply two applications 30 days apart.
Spring - apply two applications 30 days apart.
Thoroughly "sprench" planting bed to cover leaves, stems, and roots thereby attacking the fungus pathogens wherever they are present.
Companion® Biological Fungicide
1 quart per 100 gallons water
"TKO" Phosphite 0-29-26
1 quart per 100 gallons water
Hydro-Max - An All Natural Wetting Agent
1 quart per 100 gallons water
14-7-14 All Purpose Fertilizer
1 quart per 100 gallons water
Include 14-7-14 in spray tank mix when trees are no longer under stress.

Special thanks for sharing their stories:

Steve Williams Landscape Berkeley, CA
Steve Williams
Phone (510) 499-1382