1. Fungal pathogen activity (Rhizoctonia species)
Likelihood: HighBrown patch is caused by Rhizoctonia species that thrive in warm, humid, and wet conditions. The fungus attacks leaf tissue first, creating characteristic necrotic rings and water-soaked lesions under moist conditions. It spreads quickly across connected wet grass blades and through thatch.
Identification
- remove_circle_outlineCircular to irregular tan or brown patches that can expand fast during wet nights
- remove_circle_outlineDarker, chocolate-brown ring or smoky border around patches when humidity is high
- remove_circle_outlineLeaf blades that pull away easily and show sunken, brown lesions on individual blades
- remove_circle_outlineFixes usually require both cultural changes and, for severe cases, fungicide applications to stop further spread.
