• White or gray colored powdery appearance to leaf surface (does not easily rub off)
• Leaves may  yellow and turf stand thin

• Moderate/high humidity
• Shade
• Areas of poor air circulation

1. Reduce shade
2. Increase air circulation
3. Use resistant Kentucky bluegrass varieties
4. Agri-fos fungicide

• May start as small dead spots
• Leaves often look dark/black/greasy
• Fluffy gray to white "cottony" fungus may be present when disease is active
• Spots may run together and have an irregular shape, turf quickly dies, turns brown
• May be confused with brown patch

• Very hot/wet (this is a water mold, abundant water is required)
• Days high 80s to 90s and warm nights, 70 or above
• Often found in low wet areas, with poor drainage

1. Improve soil drainage
2. Increase air circulation by removing surrounding vegetation
3. Avoid excess watering
4. Avoid high rates of nitrogen
5. New seedlings often affected in hot wet conditions
6. Agri-fos fungicide

Red Thread

• Patches appear as tan, light pink or reddish
• Leaf tips and edges of leaves have fine pink or red strains of fungus present
• Size of patches 2-12"

• Moderate/wet foliage
• Prolonged periods of wet leaves

1. Follow complete fertilization program, avoid deficiencies in nitrogen and phosphorus
2. Promote growth by aeration, watering, etc.
3. Use resistant varieties
4. Bayleton or Propiconazole

• Starts as small yellow flecks on leaves, flecks enlarge to form rust colored raised spots (spores rub off on shoes)
• Over all turf yellows and thins

• Moderate/wet foliage
• Dry soil (slow leaf growth so poor recovery from damage)

1. Avoid nitrogen deficiency
2. Use resistant varieties of bluegrass and ryegrass
3. Water if dry, promote growth
4. Bayleton or Propiconazole

• Infected grass in patches, bleached, matted
• Grass appears slimy when wet
• Patches may run together to form large irregular infected areas
• Crowns are often alive for recovery

• Cool wet winters
• Saturated, unfrozen soil for long periods is ideal
• No snow required
• Occurs in winter and spring

1. Avoid lush turf in winter, keep mowing to prevent long turf in winter.
2. Rake leaves
3. Control drifting snow, prevent piles of snow.
4. Bayleton or Propiconazole

• Begins as dark wilted spots like drought stress (1-3”) and enlarge to patches (about 12’ in diameter). 
• Shapes are variable, crescents, streaks, etc. 
• Outer edge of circles/patches are brown with green centers are common. 
• Crowns & roots usually die

• Warm/extremes in soil moisture (fluctuating wet to dry)
• Poor quality soil, compacted, clay, buried stone and debris
• Usually occurs on sodded lawns with poor site preparation

1. Avoid low mowing & thatch buildup

2. Maintain soil pH of 6 to 7

3. Frequent watering when dry to avoid stress.

4. Use very slow-release fertilizer

5. Renovate the damaged areas with resistant grasses

6. Difficult to manage with fungicides

7. Bayleton or Propiconazole

• Small pin-head sized balls/debris on leaves, vary in color yellow, white, gray, purple, etc. 
• Cosmetic problem, rubs off of leaves

• Moderate to warm temperatures
• Prolonged wet foliage

1. Mechanically remove by raking or mowing (causes no injury, only cosmetic)
2. Bayleton or Propiconazole

• Irregular to circular patches (6-24”)
• Patches variable shades of tan to brown
• Outer edges of patch may be darker
• Irregular shaped lesions on leaves
• Gray to white fungal growth may be present when turf wet and high humidity
• May be confused with Pythium blight

• Hot/wet
• Days above 80 to mid 90s and warm nights, mid 60s+
• Abundant water, wet soils

1. Avoid excessive Nitrogen fertilization
2. Avoid excessive watering & poor drainage
3. Increase air circulation by removing surrounding vegetation increase sun light
4. Manage to prevent lush succulent turfgrass plants
5. Bayleton or Propiconazole

Bluegrass, Bentgrass, Fine Fescues,
Perennial Ryegrass

• Circular tan patches/spots (1-6”)
• Leaf lesions light tan with dark edges
• Leaf lesions go across leaf blade (a band)
• White fungal growth may be present in early morning when dew present

• Moderate days 60 to low 80s
• Prolonged periods of wet leaves
• Dry soil - slow leaf growth so poor recovery from damage

1. Avoid Nitrogen deficiency
2. Choose resistant grass varieties
3. Manage watering to minimize time leaves are wet
4. Water to increase growth
5. Bayleton or Propiconazole

• Dark green or brown circles (1-10’+)
• Grass in dark green ring may grow taller
• Rings may turn brown and die
• Mushrooms may grow in the ring
• A white fungal mat may be present in the thatch area of the ring and smells musty

• Grow over a wide range of temps
• Often favored by moist soils
• Brown turf may develop in
  prolonged hot dry periods

1. Improve water penetration; aeration, deep watering and wetting agents
2. Remove infected soil and sod; replace with clean soil & sod or seed

• Starts as very small dark spots/flecks
• Leaves often quickly wither and die
• Irregular patches to large areas die
• Only perennial ryegrass affected, other grasses and weeds are not affected
• No fungus (mold) is found on plants

• Prolonged hot humid weather
  patterns in summer and fall, long summer stress conditions for cool season grasses
• Moist soils (turf may appear wilted but soil moist)

1. Plant resistant varieties or avoid perennial ryegrass
2. Avoid lush turfgrass, use moderate fertilization
3. Manage watering to minimize time leaves are wet
4. Use resistant grass species
5. Minimize turf stress; reduce compaction, avoid chemical injury (herbicides)
6. Bayleton or Propiconazole

• Initially very small dark spots on leaves

• Center of spots may be lighter brown

• Crowns rot, turf thins

• Spots enlarge in size

1. Raise cutting height
2. Mow frequently to avoid stressing turf
3. Avoid excessive nitrogen
4. Avoid frequent watering and wet turf
5. Bayleton or Propiconazole