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Powdery Mildew

Powdery Mildew
Erysiphe graminis

Turf Disease

Susceptible turfgrass: Kentucky bluegrass, fine-leaf fescue, bentgrass, ryegrass, and Bermuda grass.

South Africa Golf Turf Care Treating Powdery Mildew

Symptoms

  • The disease first appears on the leaves as individual tufts of fine, white mycelium.

  • The tufts enlarge and coalesce, causing the leaves to have a greyish-white or powdery appearance.

  • Severely infected turf initially turns yellow, then tan and brown in colour.

  • Infected, shaded turf can become thinned, severe infection can result in turf necrosis. 

Conditions favouring disease

  • Powdery mildew is favoured by humid, cloudy weather with temperatures between 15°C and 22°C.

  • It occurs in areas under stress, with low light, and with high humidity.

  • Powdery mildew is also common in areas with poor air circulation, but does not require a film of water to infect turf.

Integrated turf management

• Water to alleviate drought stress.
• Avoid high levels of nitrogen and irrigation that produce lush leaf growth.
• Raise the mower height.
• Prune tree limbs to improve air circulation and the amount of sunlight.
• Convert to a polystand of shade-adapted turfgrass.

Fungicidal Control
Banner has a label recommendation for powdery mildew in South Africa.