Helminthosporium Leaf Spot

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Leaf spot symptoms
Leaf spot symptoms on perennial ryegrass
Bipolaris sorokiniana spore
Leaf Spot Symptoms on perennial ryegrass


  • Pathogen: Bipolaris sorokiniana


  • Common Names: Helminthosporium Leaf Spot, Leaf Spot


  • Climatic Zone: Temperate


  • Geographic Distribution: North America (temperate), Europe, Australia (temperate)


  • Favorable Conditions: Warm (85 F (30 C) to 95 F (35 C)) humid conditions



  • Symptoms: Dark purple to black spotting on the leaf blade, Rapid turf thinning occurs that appears an orangish-red to yellow color
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