Turf melting out is caused by the fungal pathogen Dreschlera poae, in the family Pleosporaceae. 2) Leaf Spot and Melting-Out. Leaf spot and melting-out are the common names given to a large number of lawn diseases caused by the same family of fungi. Fungicides are an effective control method if cultural management practices do not work. Eventually, the fungus invades leaf sheaths, crowns, and roots causing the "melting-out" phase of the disease.The turf thins, turns yellow to blackish brown, and roots, rhizomes, and crowns exhibit a reddish brown, dry rot. The leaf spots may be widespread throughout the lawn, indicating spread by windborne spores. This can be followed by a process known as a âmelting outâ phase. The best way to control melting out in golf course roughs is to use a resistant cultivar. Grasses affected: All mature amenity and sports turfs containing the following grass species will be susceptible to an attack of leaf spot and melting out diseases. The problem is exacerbated by the addition of nitrogen fertilisers. The melting-out phase begins during hot, dry weather and causes large irregular areas to appear dried out. The following environmental conditions are crucial for Turf Melting Out to thrive: Minimal amounts of pathogen growth can occur on healthy turf whenever there is continuous leaf wetness. Lastly it is important to have a consistent practice of aeration and topdressing to reduce thatch in the grass.[11]. Melting out causes circular to elongated purplish or brown spots with straw-colored centers on leaf blades, leaf sheaths, and stems. Melting Out disease is sometimes called leaf spot. Dollar Spot. Marked first by leaf damage (spots or blotches to be specific) and then by rotting roots, leaf spot fungus can destroy the health of a ⦠When the spores are released, splashing water from rain or irrigation transfer them to new healthy plants. Once this happens, the cells of the turfgrass are killed, causing the spots to form. Cultural Controls include improving soil aeration and water drainage along followed by re-seeding with resistant grasses. [4], Dreschlera poae thrives during spring conditions and affects many cool season turfgrass species such as bluegrasses (Poa spp. The conidia are olive-brown to dark-brown and the conidiophores are light yellow-brown. They are incited by a family of fungi including Drechslera, Bipolaris, and Exserohilum. Melting out starts as a leaf spot, then works its way to the plant base and attacks the roots and crown. Melting-out disease first forms leaf spots in a �bulls-eye� pattern before it spreads to the leaf sheaths, crown and roots, ultimately killing the plant. Chemical Controls include using fungicides if they are applied when the disease first begins to appear. Get free shipping on qualified Melting Out Lawn Disease Control or Buy Online Pick Up in Store today in the Outdoors Department. The leaf-spotting or leaf-blighting phase is less damaging to the turfgrass than is the meltingâout (crown and root-rot) phase of the diseases. During infestation, these spots widen and develop tan centers, killing the grass blade above its root. Melting Out Leaf Spot may progress into a condition called âmelting-outâ, a condition where the turf just seems to âmelt awayâ as the disease activity becomes more and more severe. (adsbygoogle = window.adsbygoogle || []).push({}); At one time, melting-out disease was considered to be one of the most important diseases effecting Kentucky bluegrass and other cool-season turfgrasses, as well as bermudagrass. As the disease progresses, the infected turf becomes thin and brown. During hot weather, the leaf symptoms may not occur, but the rest of the plant is affected. Newly seeded lawns are sensitive to leaf spot and melting-out, but severe damage is most common on established lawns planted with Kentucky bluegrass cultivars that are susceptible to the disease. Helminthosporium (now thatâs a mouthful!) Although it is still a problem, many resistant cultivars and management strategies have been developed for melting-out, thus making it easier to manage. Proper lawn care will help prevent this lawn disease from appearing in the first place. Spacing and aeration keep the plant dry and free from disease. Also it is important to avoid irrigation during cool wet rainy periods. Sporulation then occurs on the infected leaves and continues to reproduce as long as the cool, wet conditions persist. Outâ stage of the turf appears yellow or blackish brown phase of the following are... Affects all parts of the plant base and attacks the roots of the following conditions are either irrigation! 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