Fast Facts: LEAF SPOT

• Formerly called Helminthosporium, now known as Drechslera poae.
• Primarily affects Kentucky bluegrass.
• Damage can be severe if allowed to progress from the leaf spot stage to the crown and root    rot state (also known as melting out).
• Typically seen during cool, wet weather (40°– 80°F; peak 60-65°F).
• Infection occurs from conidia and dormant mycelium in thatch.

CLEARY SOLUTIONS FOR LEAF SPOT CONTROL

• Endorse, with its unique chemistry and novel mode of action, provides excellent control of    leaf spot while also controlling other spring diseases like yellow patch and red thread.
• Protect DF is a top performer in leaf spot control, while also offering control of late season    pink snow mold. The contact mode of action makes it a great tank mix partner with    Endorse. Choosing Protect in the spring also helps you to manage seasonal limits on    chlorothalonil use.
• Spectro 90, with its dual mode of action, provides excellent control of leaf spot, as well as    red thread, yellow patch and snow mold (pink and gray).
• 26/36 Fungicide is excellent for controlling leaf spot as well as red thread, yellow patch,    pink    and gray snow mold and smut. Its penetrant and systemic activity gives you the       benefits of    a tank mix in a single product.

BEST MANAGEMENT PRACTICES FOR LEAF SPOT CONTROL

• Maintain adequate and balanced fertility; avoid high N, especially in spring.
• Avoid prolonged leaf wetness i.e. late afternoon watering.
• Increase light penetration and air movement.
• Remove excessive thatch.
• Mow regularly at the recommended height for the species.
• Use hormonal-type pesticides carefully (phenoxy herbicides/plant growth regulators)
• Choose resistant cultivars.

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