ArborFos™
ArborFos™ is a unique phosphite formulated fungicide that works differently from traditional fungicides by stimulating the plant's own natural defense systems. Research indicates it may elicit systemic acquired resistance responses, helping trees develop healthier leaves, roots, and stems.
Active Ingredients
- Phosphorous acid 45.8%
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ArborFos™ Product
Problems This Product Treats

Fire Blight
Professional treatment available with ArborFos™

Sycamore Anthracnose
Professional treatment available with ArborFos™

Bacterial Blight
Professional treatment available with ArborFos™
Target Pests
Target Diseases
Nutrient Deficiencies Addressed
This product does not target specific nutrient deficiencies.
Available Packaging Options
Professional Usage Guidelines
Phosphite formulated fungicide that inhibits fungal growth through stimulation of the plant's own natural defense systems. Registered for ornamental, forest and certain crop trees to manage many diseases including root diseases.
States Where This Product is Registered
Arizona
Arkansas
California
Colorado
Connecticut
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kentucky
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
Wisconsin
Wyoming
Need Professional Guidance?
Our expert team can help you determine the right treatment approach and application methods for your specific tree care needs.