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Grasses Commonly AffectedĪll types of warm-season or cool-season lawn grasses grown in South Carolina can be affected by large patch or brown patch, respectively. Newly seeded tall fescue in the spring is more susceptible and more easily killed than mature fescue seeded in the fall.

Bentgrass may not show individual lesions, but leaves will turn brown and shrivel. Therefore, it is diagnostic for the disease if one tugs gently on the leaves in the recently discolored perimeter and the blades pull free.Ĭlose inspection of cool-season grass blades reveals small, irregular, tan leaf spots with dark-brown borders. Infected warm-season grasses rarely have leaf spots but instead have rotted leaf sheaths (where the leaf blades attach to the stem) near the soil surface. Joey Williamson, ©2015 HGIC, Clemson Extension Augustinegrass when grown in shady, moist locations.īrown patch on turfgrass tall fescue lawn often has a smoky brown perimeter where there is active fungal growth.This coloration may be more apparent during the early morning hours. This type of pattern is commonly seen on infected St. However, during conditions that are favorable for rapid disease spread, large areas of the lawn may be thinned and killed without the formation of noticeable circular patches. Many times the turfgrass in the center of the patch will recover, resulting in a doughnut-shaped pattern. These areas range in diameter from a few inches to several feet. The diseases usually cause thinned patches of light brown grass that are roughly circular in shape. Symptoms of brown and large patch diseases may vary greatly with the type of grass and soil conditions. However, most symptom development occurs in spring during the green-up of the lawns. The fungus causing large patch disease is most active during the late fall and again during the spring. Typically, bermudagrass is not as severely damaged as are the other warm season turfgrasses because its rapid growth and spread allows it to recover more quickly. Warm-season grasses most commonly affected by large patch are centipedegrass, zoysiagrass, and St Augustinegrass. It may also occur on these grasses during warmer periods of the winter months. Generally, symptoms of brown patch begin on cool-season grasses (tall fescue, ryegrass, bluegrass, and bentgrass) during the late spring and can continue during the summer. These diseases can rapidly develop when there is an extended period of leaf wetness, and the temperatures are suitable for disease development. The beauty of all South Carolina lawn grasses can be quickly destroyed by these diseases, which are each caused by a different strain of the fungal pathogen, Rhizoctonia solani. Brown patch and large patch are probably the most common and damaging diseases of cool-season and warm-season turfgrasses, respectively, in South Carolina.

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