How to Manage Pests
UC Pest Management Guidelines
Curvularia blight causes thinning out and decline of the grass; irregular patches and streaks may also occur. Leaves yellow and then become brown from the leaf tip down. Leaf spots can occur with symptoms most severe on older, senescing leaves. Roots, stolons and rhizomes may also become infected. A fine, grey layer of mycelia may cover infected tissues, and there is often an abundance of sporulation from infected and dead tissue. Spores are borne on the mycelia and no enclosed fruiting structures are formed.
Annual bluegrass, bermudagrass, bentgrass, and fescue are susceptible to curvularia blight.
The pathogen invades grasses through cut tips of leaves and is favored by high temperatures and adverse growing conditions. This is primarily a stress pathogen that attacks low fertility and heat and drought stressed plants. Damage often occurs when temperatures are 85°F or higher.
To prevent conditions that can lead to the development of curvularia blight, avoid both overwatering and drought stress by irrigating according to evapotranspiration needs of the turfgrass. Fertilize to promote moderate growth. Maintain as high a mowing height as possible and control thatch. Avoid planting shade trees in the surrounding area. Fungicides may be warranted on golf greens during long periods of high temperatures.
UC IPM Pest Management Guidelines: Turfgrass