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Lawn Disease Control

red thread lawn disease controlEven if a lawn is properly fertilized and treated for weeds and insects, it doesn’t protect it from turf disease. Due to certain environmental conditions, turf diseases may damage lawns in summer. If you suspect or are concerned about damage to your lawn disease control can be a possibility worth considering. One of our Certified Turfgrass Professionals will be able to diagnose which specific disease is or could affect your lawn and discuss options of control and/or prevention with you.

Read more about how lawn diseases occur, on our blog!

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Pink Snow Mold

Susceptible Turfgrass:  Most species of cool-season turfgrass

Favorable Conditions:  Favors temperatures of less than 60°F, occurs on turfgrass under long periods of snow cover.

Recommendations:  Regularly mow turf until dormancy, leaving leaf blades 2.5”-3” on last mowing. Maintain balanced fertility. Reduce thatch. Rake areas in late winter to increase air movement on leaf tissue. Rarely warrants fungicide applications unless conditions are severe.

Red Thread/Pink Patch

Susceptible Turfgrass:  All turfgrass but especially severe on fine-leaf fescue and perennial ryegrass

Favorable Conditions:  Thrives in temperatures between 40°F and 85°F and in areas that are low in nitrogen. Areas that experience more than 10 hours a day of folar wetness for several consecutive days are conducive to this disease.

Recommendations:  Mow frequently and collect clippings to remove diseased portions of leaves. Maintain adequate nitrogen fertility levels. Apply moderate to high amounts of phosphorus and potassium. Maintain soil pH of 6.5-7.0. Irrigate turf deeply and infrequently. Use fungicides to control disease when it is a severe or chronic problem, applying on approximately 21-28 day intervals.

Leaf Spot/Melting-Out

Susceptible Turfgrass:  Creeping red fescue, Kentucky and annual bluegrass, perennial ryegrass, tall fescue

Favorable Conditions:  Favored by temperatures between 40°F and 80°F and in areas that experience more than 10 hours a day of foliar wetness for several consecutive days. High amounts of nitrogen and low mowing heights are also conducive.

Recommendations:  Increase height of mowing cut. Apply moderate rates of nitrogen, irrigate turf deeply and infrequently. Reduce thatch. Apply fungicides in spring to the end of summer on approximately 21-28 day intervals.

Fusarium Patch

Susceptible Turfgrass:  Most species of turfgrass

Favorable Conditions:  Thrives in temperatures less than 60°F and in locations that experience more than 10 hours a day of foliar wetness for several consecutive days. It also favors areas high in nitrogen fertility and low in phosphorus and potassium. Areas of turf that grow slowly and have heavy thatch are also likely areas of infection.

Recommendations:  Maintain balanced fertility. Reduce thatch. Apply fungicides prior to or at the first signs of disease on approximately 21-28 day intervals. Turf recovery is more likely in the fall.

Dollar Spot

Susceptible Turfgrass:  All species of turfgrass

Favorable Conditions:  Favored by temperatures between 59°F and 86°F and continuous high humidity. Warm days, cool nights, and intense dews are conducive to Dollar Spot.

Recommendations:  Use an adequate level of nitrogen during spring and summer. Mow at regular intervals. Reduce thatch. Irrigate turf deeply and infrequently. Convert to a turfgrass variety that is more resistant to this disease. Apply fungicides in late spring to the end of summer on approximately 21-28 day intervals.

Summer Patch

Susceptible Turfgrass:  Annual bluegrass, fine-leaf fescue, and Kentucky bluegrass

Favorable Conditions:  Daytime temperatures over 85°F during the day and over 70°F at night, found in areas with high soil moisture, compaction, poor drainage, and low mowing height.

Recommendations:  Reduce soil compaction by core aerating, convert turfgrass to resistant turfgrass species. Apply fungicides in late spring to the end of summer on approximately 21-28 day intervals.

Pythium Blight

Susceptible Turfgrass:  Annual bluegrass, tall fescue, perennial ryegrass

Favorable Conditions:  Nighttime temperatures over 68°F, occurs in areas that experience more than 10 hours a day of foliar wetness for several consecutive days, and in areas with poor drainage and air circulation.

Recommendations:  Avoid mowing wet turf to reduce spreading of disease. Reduce thatch. Reduce soil compaction by core aerating, convert turfgrass to resistant turfgrass. Apply fungicides in late spring to the end of summer on approximately 21 day intervals.

Brown Patch

Susceptible Turfgrass:  All species of turfgrass

Favorable Conditions:  Prefers high relative humidity as well as daytime temperatures over 85°F and nighttime temperatures over 60°F, occurs in areas that experience more than 10 hours a day of foliar wetness for several consecutive days, and in areas with poor drainage and air circulation, and in lawns that are mowed to short.

Recommendations:  Increase mowing height. Reduce thatch. Reduce soil compaction by core aerating, convert turfgrass to resistant turfgrass. Apply fungicides in late spring to the end of summer on approximately 21-28 day intervals.

Rust

Susceptible Turfgrass:  Kentucky and annual bluegrass, ryegrass, tall fescue, fine fescue

Favorable Conditions:  Typically occur in early spring through fall, but most prevalent in late summer, prefers moist, low-light areas. Prefers temperatures between 65°F and 86°F and particularly on turfgrass with low nitrogen levels and/or drought stress.

Recommendations:  Water deeply and infrequently in morning.  Reduce thatch. Reduce soil compaction by core aerating, convert turfgrass to resistant turfgrass. Rarely warrants fungicide applications unless conditions are severe.

Slime Molds

Susceptible Turfgrass:  All turfgrass varieties

Favorable Conditions:  Typically occur in cool, humid weather.

Recommendations:  Slime molds do not damage turf (apart from shading) and can be removed by watering, mowing, brushing, and raking. Chemical control is not necessary.



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