Yellow to orange flecks on leaves or stems.Rings or circular patches of blighted grass.Gray to brown shaped lesions on leaves or leaf sheaths. Roots may have dark strands of mycelium parallel to the root axis. Lower leaves are chlorotic first and then chlorosis moves to upper leaves. Irregular chlorotic patches up to 0.5 m across.Concentric ring of dead grass may be present. Circular rings of dark green grass 10-20 cm wide.Individual leaf blades may or may not develop lesions. Patch is greater than 6 cm in diameter.Individual leaf blades develop white lesions. Patch is small, circular, sunken, and rarely exceed 3 inches in diameter.Distinct patches of yellow to brown colored grass are present. Simplified Turfgrass Disease Identification Key A. Use literature and resources to reach a diagnosis.Place cover slip over mount and view beginning with smallest magnification and change magnification as the desired signs in question are found.Pull sections from the roots, blade sheath and /or crown, and any leaf spots.Place a small drop of water or stain on the slide.Prepare a microscope slide mount based on signs and view with compound microscope.Using a hand lens or compound microscope, observe any fungal signs that may be present (mycelia, sclerotia, pycnidia, etc.).Store rest of the sample inside a plastic bag which contains a moist paper towel. Use half of sample to perform diagnosis.Collect a representative sample with a range of symptoms including leaf blades and roots.What is your watering and fertilization schedule?. Ask questions to narrow down the cause of the symptoms.Patches, yellowing, chlorosis, leaf spots, etc.Some diseases are more likely to occur on certain grass species.Systematic Approach to Diagnosis of Turfgrass Diseases Simplified Turfgrass Disease Identification Key.Systematic Approach to Diagnosis of Turfgrass Diseases.
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