Texas Root Rot

Disease

High Threat

Affects: Over 2,000 plant species - most susceptible: shade trees, fruit trees, ornamentals in alkaline soil

Photo: S.D. Lyda / (CC-BY-3.0-US (Bugwood))

Identification & Biology

Soil fungus (Phymatotrichopsis omnivora) that attacks roots in hot weather. Trees wilt suddenly in summer heat and die within days. One of the most destructive plant diseases in the Southwest.

Current Status

Endemic in alkaline desert soils of AZ, NM, TX.

States affected:

Arizona Nevada New Mexico

What Homeowners Should Do

Plant resistant species (most native desert trees are resistant). Amend soil pH where practical. Flutriafol (Topguard) soil drench is the only partially effective treatment.