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Lawn Disease

Use this guide to identify some common lawn diseases.

Rust Fungus

Rust spores will turn shoes orangish-red.  Forms when grass in unable to dry out, thatch is thick, mowing in infrequesnt.

Treatment: Regular mowing.  Spores live in blade tips and die when cut.  Clean lawn implements to prevent spreading.

Rust Fungus (Shoe)

Red Thread

Cool season grasses most susceptible.  Grass may appear to be dead, but it does not kill the grass as crown and roots of grass are not affected.

Treatment: None recommended.  Will disappear as the temperature increases.

Red Thread

Necrotic Ring

Infects the roots of Kentucky Bluegrass typically on sports turf.

Treatment: Aggressive.  Dig out to depth of 6 to 8 inches.  Clean implements to prevent spread. Systemic fungicide treatment.

Necrotic Ring

Moss

Can help lawns retain water.  Can be decorative.  Increases and spreads rapidly.

Treatment: 1 gallon of water to 2 ounces of gentle dish soap (blue Dawn) in a spray bottle.

LawnMoss

Mushrooms

Mushrooms break down organic material and make your soil more productive.

Treatment: None recommended.  Will disappear as the temperature increases.

Mushrooms

Fairy Ring

Fairy rings are caused by many different soil-inhabiting fungi (of Basidiomycetes class), which can cause the development of rings or arcs of deep green grass or dead grass. Mushrooms can develop in rings.

Treatment: Mow grass with vertical mower.  Aerate.  Remove stumps and roots that are decaying to reduce amount of organic matter on which they feed.

Fairy Ring

Dollar Spot

Surface of lawn stays wet.  Soil is dry.  Infection occurs in extended dew periods in temperatures (50-80 degrees F).

Treatment: Proper irrigation scheduling and fungicide treatment.

Dollar Spot

Brown Patch

Affects all cool season turf grasses and can result in thinning and poorer quality grass.  May develop overnight.  Active during hot summer when overnight temperatures stay about 65o with dew periods exceeding 10 hours.

Treatment: Be aware of other fungal infestations that may be present, as they affect the type of fungicide treatment used to treat Brown Patch.  Can exacerbate other fungal infestations if not carefully selected.

brown spot

Pink Slime Mold

Will usually go away with the absence of dreary wet weather.

Treatment: None.  Can wash off with a hose.

Pink Slime Mold

Dog Vomit Mold

More closely related to an amoeba than a fungus. Common in wet weather.

Treatment: None.  Can wash off with a hose.

Dog Vomit Mold

Grey Leaf Spot

Can resemble drought stress.  Foliar disease that infects perennial Ryegrass and Tall Fescue with a blue gray cast and noticeably thins, decays and kills grass blades.   Moderate outbreaks result in clusters of dead grass, whereas a severe outbreak can kill the entire turf.  Spreads very fast.  Young lawns extremely susceptible.

Treatment: Avoid extending dew periods by not using irrigation during late afternoon or early evening.  Early detection necessary with immediate fungicide treatment by lawn professionals as responsiveness can be erratic.

Gray Leaf Spot

Irregular patches of straw-like grass that appears dormant or dead, may be caused by one of the 80 various fungal infestations that cause Ascochyta Leaf Blight.  Though the lawn appears severely damaged and dead, the fungi does not affect Bluegrass crowns and roots and the turf can quickly recover with good remediation.  Sharpen mower blades.  Rinse implements to reduce the ability to spread the blight.  Avoid mowing during wet weather.  Core aerate your lawn in the Fall to reduce thatch. Click here to read more about Ascochyta Leaf Blight’s causes, environmental conditions affecting severity, and its treatment. 

Ascochyta Leaf Blight
Bee Green has treated my lawn for several years now and they do a great job on treating my special needs such as grubs and weeds. Great job.
Jay
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