Brown Patch in Zoysia: Why Soil Tests Won't Detect It

Soil Tests Measure Nutrients, Not Fungi

Extension soil tests only check nutrient levels. Testing for fungi is futile—thousands of species exist, and labs can't distinguish harmful from harmless ones. Brown patch fungi likely live in your soil always; they attack only when plants are stressed, usually by excess moisture near roots.

Prevention Focus

Avoid over-fertilizing zoysia and water only once per week to keep roots healthy and disease-resistant.