Treatment for leaf spot lawn disease may be required every 3–4 weeks to gain control. Leaf spot (drechslera, bipolaris, exserohilum), or “melting out” disease takes the form of brown or black spots on grass blades. Leaf Spot is a fungal disease characterized by grass blades having small oval spots with straw-colored centers and maroon borders. Houston Grass South Owner Michael Romine talks about gray leaf spot in established lawns and how to treat the fungus in this video. For more information on proper St. Augustinegrass care, see HGIC 1218, St. Augustinegrass Maintenance Calendar and on other turfgrass diseases, see HGIC 2152, Leaf Diseases of Lawns, and HGIC 2150, Brown Patch & Large Patch Diseases of Lawns. Preventing Lawn Fungus 1. Leaf spots on grass blades are tan to gray with purple to brown margins. Water your lawn only when necessary. Leaf spots on grass blades are tan to gray with purple to brown margins. During the leaf spot phase of this lawn disease (spring or fall), individual grass blades will have large numbers of lesions (or infection marks) that appear a little like a cigarette burn, a dark circle with a tan spot in the center. Under these conditions, the disease causes serious thinning of the turf. Grey Leaf Spot Fungus can devastate a lawn, killing the entire blade of grass, and if left untreated, it can make its way all the to the runner, killing off sections of grass. Proper Care For cool-season grasses, follow the proper care for your lawn during the summer and then core aerate and overseed in the late summer to early fall with leaf spot resistant seed. ›. Under favorable conditions for disease development, large areas of turf may appear to be scorched, resembling extreme drought stress. Gray leaf spot of St. Augustinegrass is a disease caused by a fungus that is common during extended periods of hot, humid weather. Conditions for leaf spot are extreme this year because rain events have created prime conditions for the fungus and prevented many producers from accessing hay pastures to cut, she said. Gray leaf spot is a fungal disease (caused by Pyricularia grisea) that occurs most commonly on St. Augustinegrass (Stenotaphrum secundatum), but occasionally may also be found infecting tall fescue, bermudagrass, centipedegrass and ryegrass in home lawns. Leaf spot disease — or melting out disease as it’s sometimes called — is a common lawn disease that is caused by different fungal organisms from the Helminthosporium species. Enter your address to find available services. Disease-causing fungi are almost always present in the soil, waiting for a time when conditions are right to attack. Symptoms are small reddish brown, oval lesions which coalese resulting in an overall reddish cast to affected turf. Treat grey leaf spot fungus using thiophanate-methyl Grey-leaf is a fungal disease characterized by irregular bleached-out patches on your turfgrass and is caused by high humidity levels and over-fertilization. This helps prevent the spread of leaf spot spores. https://getlawnstar.com/blog/lawn-fungus-identification-guide Choose a product labeled for control of turf leaf spot fungal disease. Discount Code. Cause and Symptoms: Gray leaf spot develops rapidly with abundant moisture and warm temperatures on St. Augustine grass. Lawn treatment services, if needed, should begin early. Development Factors. Leaf spot makes turf look sick, but does little permanent damage. Clemson University Cooperative Extension Service offers its programs to people of all ages, regardless of race, color, gender, religion, national origin, disability, political beliefs, sexual orientation, gender identity, marital or family status and is an equal opportunity employer. Melting out occurs in hot weather and can be easily confused with drought stress or insect damage. Grey Leaf Spot thrives in conditions of high humidity above 95%, extended wet periods, including rainfall, and temperatures exceeding 80-90 degrees consistently. It is especially troublesome in shaded areas that remain damp for some time. “Charlestongrass”) and ryegrass. The disease usually shows when the sward is under stress and when the right weather conditions prevail. Spotted leaves occur when fungal spores in the air find a warm, wet, plant surface to cling to. If the leaf spot has progressed in the disease cycle (where grass leaves are close to being overtaken by the spots) or if melting out has begun, it might very difficult to control. Limb up over-hanging trees and prune back nearby shrubs. Many conditions can cause patches of brown, dead grass on your lawn, but only one gets the official name brown patch. Leaf spot and melting-out are the common names given to a large number of lawn diseases caused by the same family of fungi. Gray Leaf Spot Gray leaf spot is caused by the fungus, Pyricularia grisea, and causes severe damage primarily on St. Augustinegrass (a. k. a. Leaf spot / melting out is one of several Helminthosporium diseases which survive in thatch during periods that are unfavorable for disease development. Use pesticides only according to the directions on the label. If you see Grey Leaf Spot in your lawn it is best to treat straight away to avoid/limit the spread. Brown patch disease is a condition caused by a single species of fungus, Rhizoctonia, that often occurs in mid- to late-summer when the weather is hot and humid. Follow all directions, precautions and restrictions that are listed. It’s caused by several different fungi that kill the grass when the weather warms up. It’s best to be sure the grass does not stay continuously wet or become excessively dry. On St. Augustinegrass the initial leaf spots are small and brown, but they expand rapidly into large, oval or elongate, tan to gray leaf spots, which are surrounded by purple or brown borders. Enter yourNeighborhood Red Leaf Spot caused by Drechslera erythrospila is a disease of bentgrasses. All recommendations for pesticide use are for South Carolina only and were legal at the time of publication, but the status of registration and use patterns are subject to change by action of state and federal regulatory agencies. Leaf spot generally starts in cool weather but can occur at any time. A yellow halo may surround some of the spots, or a general leaf yellowing may occur. Avoid medium to high nitrogen fertilizer levels. It is identified by the purple and brown spots that appear on the grass blades. Daconil Ultrex Turf Care Fungicide. Did you receive a mailing or email from us? Blades of grass will wither and die if leaf spots are numerous. 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