Lawn and Turf: 2,4-D damage categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:46 2,4-D damage to grass Photo by: Beth Staley Biology Bentgrasses are commonly used for lawns in western Washington and found as weeds in eastern and western Washington. Both weedy species and cultivated varieties are susceptible to damage […]
Lawn and Turf: Algae categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:47 Black algae Photo by: G. Stahnke Biology Algae are tiny, single-celled plants commonly found in lakes and wet areas. Algal growth on lawns is common in the coastal regions of the Pacific Northwest, particularly on grass planted in […]
Lawn and Turf: Anthracnose/Basal crown rot categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:49 Basal crown rot Photo by: R.S. Byther Biology Anthracnose of turfgrass is a fungal disease with two phases: Phase I affects the leaves and is active in the summer. Typical symptoms include yellow to tan or […]
Lawn and Turf: Brown blight categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:49 Brown blight Photo by: R.S. Byther Biology Brown blight is a fungal disease affecting the leaves of perennial ryegrass and some fine fescues. Infection commonly occurs during cool, wet periods. The disease is typically worse during the […]
Lawn and Turf: Brown patch categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:50 Brown patch Photo by: G. Stahnke Biology Brown patch is a fungal disease typically affecting bentgrasses and annual bluegrasses. Infected grass appears as patches a few inches to several feet in diameter. The patches are generally circular […]
Lawn and Turf: Curvularia blight (Fading out) categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:51 Biology Curvularia blight of turfgrass can be caused by eight species of fungi. Infected areas of lawn develop yellow or dappled yellow-green patches 2 to 3 inches in diameter. These patches later turn reddish-brown. The […]
Lawn and Turf: Dog injury categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:52 Dog damage dead patch Photo by: R.S. Byther Biology Dog injury typically appears on lawns as brown, circular patches a few inches in diameter. These patches may be surrounded in a few days by a ring of […]
Lawn and Turf: Dollar spot categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:53 Dollar spot Photo by: G. Stahnke Biology Dollar spot is a fungal disease that affects most turfgrass species under low fertility. Leaves develop water soaked, dark lesions which become light tan with a reddish-brown margin as they […]
Lawn and Turf: Fairy ring and mushrooms categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:54 Fairy ring and mushrooms Photo by: R.S. Byther Biology Several species of fungi can cause fairy rings in lawns. The common symptoms may include a ring of dead grass with darker green grass and mushrooms […]
Lawn and Turf: Leaf spot categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:55 Drechslera leaf spot Photo by: R.S. Byther Biology Fungal diseases of turf caused by Drechslera sp. include leaf spot and melting-out, root, crown, and rhizome rots, and net blotch. Leaf spots first appear as small, water-soaked areas […]
Lawn and Turf: Microdochium patch (Pink snow mold) categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:55 Fusarium patch Photo by: R.S. Byther Biology Fusarium patch is a fungal disease common in western Washington. It is typically most severe on bentgrass and annual bluegrass at low mowing heights in shaded areas. […]
Lawn and Turf: Moss categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:56 Moss in lawn. Photo by: G. Stahnke Biology Mosses are small, simple, non-flowering plants. They are typically low-growing and somewhat yellowish-green in color. They grow vigorously in the cool, moist weather of fall, winter, and spring, when lawn […]
Lawn and Turf: Necrotic ringspot categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-16 02:57 Necrotic ring spot Photo by: R.S. Byther Biology Necrotic ringspot (NRS) is a fungal disease primarily occurring on Kentucky bluegrass in central and eastern Washington and Oregon. It is most common on 2- to 5-year-old lawns grown […]
Lawn and Turf: Powdery mildew categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-21 05:10 Powdery mildew on grass Powdery mildew Biology Powdery mildew is a fungal disease affecting the leaf blades. Bluegrasses and fescues are the most commonly affected lawn grasses. Blades and sheaths of older leaves are covered with mats […]
Lawn and Turf: Pythium crown and root rot categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-21 05:12 Pythium crown and root rot Photo by: R.S. Byther Biology Pythium crown and root rot is caused by fungi which can also cause damping-off of new grass plantings. The rot causes a general decline […]
Lawn and Turf: Red thread categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-21 05:15 Red thread Photo by: R.S. Byther Biology Red thread is a fungal disease common in cool, moist regions. It may occur on bentgrasses and bluegrasses but is most common on red and chewings fescues and perennial ryegrasses. […]
Lawn and Turf: Rusts categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-23 12:16 Rust Photo by: R.S. Byther Biology Several species of fungi cause rusts of turfgrasses. Typical symptoms include yellow specks on the leaf blades followed by development of yellow, orange, dark orange-brown, or red rust pustules on either or […]
Lawn and Turf: Septoria leaf spot (Tip blight) categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-21 10:32 Septoria leaf spot (tip blight) Photo by: R.S. Byther Biology Septoria leaf spot is a fungal disease of the leaves of many grasses. Gray-green spots develop near the leaf tips, later fading to yellow […]
Lawn and Turf: Slime molds categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-21 10:36 Slime mold Photo by: R.S. Byther Biology Slime molds are related to fungi. They do not cause disease on turfgrasses as they feed only on decaying organic matter, but they can be an aesthetic concern. They emerge […]
Lawn and Turf: Take-all patch categories: Lawn and Turf Lawn and Turf Diseases last review date: 2025-08-21 10:37 Take-all patches Photo by: R.S. Byther Biology Take-all patch is a fungal disease common on bentgrass, particularly on young plants. Symptoms first appear in late spring as small, brown, dead areas of grass approximately 2″ in diameter. […]