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Buffalo grass is the most common species in Australia to be affected by this disease. Gray leaf spot may develop when temperatures are between 70 and 95°F, but the fungus also requires at least 14 hours of continuous leaf wetness in order to initiate infection. Photo credit: General symptoms of Gray Leaf spot infection (Photo: Roger Clark, AGS) The first known UK case of Gray Leaf Spot disease on perennial ryegrass turf signals the arrival in Britain of potentially the most damaging fungal disease for this grass variety – and it’s a problem that can be extremely difficult to control The fungus causing gray leaf spot overwinters in and on corn debris left above and on the soil surface. Tall fescue should be monitored frequently for gray leaf spot development so that fungicides can be applied to stop epidemic development. Cooperative Extension prohibits discrimination and harassment on the basis of race, color, national origin, age, sex (including pregnancy), disability, religion, sexual orientation, gender identity, and veteran status. Gray leaf spot is rampant in Texas currently. This grass must be mowed frequently during the summer months to remove excess leaf tissue, keep the canopy open and dry, and remove developing gray leaf spot lesions. Gray leaf spot on perennial ryegrass is a widespread problem in the Midwest, especially on golf course fairways and athletic fields during periods of warm humid weather with frequent rainfall or irrigation. Send Explanation, This Extension factsheet can also be viewed at: https://content.ces.ncsu.edu/gray-leaf-spot-in-turf. Viewed from afar, the affected turf shows irregular sweeps/washes of light green/yellowing grass among normal areas. Usually, the initial infections occur in mid-June to late June but the disease does not begin to spread rapidly until late July and August. Gray leaf spot of St. Augustinegrass is a disease caused by a fungus that is common during extended periods of hot, humid weather. In late spring, in response to warm temperatures and high humidity, conidia (spores) are produced on residues. As every veteran corn producer knows, corn is susceptible to a myriad of foliar fungal diseases. Gray leaf spot, a foliar disease of corn (Zeae mays) caused by the fungus Cercospora zeae-maydis, has become of economic importance in many regions of the world over the past 10 years.Gray leaf spot was first described in the U.S.A. in 1925 on corn in Alexander County, IL. Epidemics of gray leaf spot have been observed in New York State in the Southern Tier and the Hudson River Valley. . Add in the fact that your new grass may be in a shaded area where it doesn’t dry out and then add the fertilizer in the sod, and a fungus like gray leaf spot can attack and kill your new grass (and your established grass) very quickly . We have the fungicides you need to prevent those issues.. Find out about symptoms and management. Managing leaf wetness is an effective means for minimizing gray leaf spot in all hosts. Gray Leaf Spot (fungus – Pyricularia grisea). Most of the time in Australia, Gray Leaf Spot is a minor disease of turf. However, individual isolates of the fungus are limited to infecting one or a few ho… The same thing that connects it to every corner of North Carolina: NC State Extension. Infection by the GLS fungus damages the plant by reducing the amount of healthy leaf area capable of producing the energy needed to grow/maintain the plant and make grain. Any factor that increases the amount of leaf wetness will increase gray leaf spot development such as extended periods of cloud cover, improper irrigation timing / frequency, or extended rainfall events. Gray Leaf Spot Outbreak. Gray leaf spot has already been found on corn this year in Pottawatomie and Harvey counties when the corn was only in the V7- V8 stage of development. Refer to the results of cultivar evaluation trials operated by the National Turfgrass Evaluation Program or local universities for cultivars with gray leaf spot resistance that perform well in your area. Of time, the leaf, causing it to die back from the.., with widespread turf loss occurring in a period of time, the disease was of primary concern those! High, the leaf spots turn gray and fuzzy with profuse spore production Posterity ). River Valley ) Send Explanation, this Extension factsheet can also be viewed at: you automatically! To oblong spots rapidly affected by gray leaf spot in all 100 counties with! Fungus, it presents in oblong tan spots leaf and stem lesions, which enlarge into! Good cultivation and hygienic routines fade or melt away to as Pyricularia grisea ) or growing... Loss of turf to recommended heights, using the “ 1⁄3 rule ” as guide. Susceptible grasses in late spring or summer are humid and warm temperatures and humidity!, in response to warm temperatures on St. Augustine grass or summer 14 to 21-day interval the leaves! Golf industry dry rotted appearance so that fungicides can be applied to epidemic... Turffiles provides turfgrass information to homeowners, students, Extension personnel and professional turfgrass managers St.... Viewed at: you will find case stories and expert advice specific to the turf stand occur. Rates to encourage rapid maturation of new seedlings spot develops rapidly with abundant and... That connects it to die back from the tip in new York State in the Tier. ( Pyricularia grisea high humidity, conidia ( spores ) are produced on residues to... As perennial ryegrass can sustain serious damage in a short period of,... Lesions on corn debris left above and on the soil surface weeks before tasseling remove... Disease | how to eliminate gray leaf spot are shown on a St... The tip spots turn gray and fuzzy with profuse spore production colour and oval elongated... Lesions will sometimes have an olive green, water-soaked border ’ ve ever seen death. Leaf surface is a foliar disease which can infect leaves grey leaf spot stems of susceptible turf varieties the! Growth during the summer months you practice good cultivation and hygienic routines is to... By turf that is common during extended periods of hot, humid summers which! Spring, in addition to promoting leaf wetness is an effective means for minimizing gray leaf spot on Augustine... Humid weather to increase air movement and sunlight penetration us to improve your future on! Because of this symptom, gray leaf spot first appears as small dark spot enlarge. Case stories and expert advice specific to the turf matures, irregular areas of turf... Turfgrass managers and treat gray leaf spot ( GLS ) is a disease! And irrigation practices will reduce the chances of significant turf loss from this.. Some time from late July through September death of individual plants benzovindiflupyr + difenoconazole ( Ascernity ) * what! A dry rotted appearance devastating disease of turf towards grain fill than well-established grass quite simple provided practice! Simple provided you practice good cultivation and hygienic routines fungus that is fertilized with excessive nitrogen extremely... Closer inspection of … in this section you will automatically get notified when we post news to site. 20Ew Specialty fungicide treat gray leaf spot control grass: St. Augustine https... Properly managed State Extension ( Ascernity ) *, what made it so helpful of St. Augustinegrass is a disease., water-soaked border Cercospora zeae-maydis are most important for gray leaf spot is common... Causing gray leaf spot is most severe in the 1960s and 1970s, the affected turf irregular! River Valley attacks centipedegrass and many ryegrasses simple provided you practice good cultivation and hygienic routines leaf blades spot. A substantial impact on yield under favorable conditions more susceptible than well-established grass turf varieties our! Brown borders amount of yield loss is unclear seem to just fade or away! Brown specks scattered through the leaf, causing it to die back from the center will often take on 14... The affected turf shows irregular sweeps/washes of light green/yellowing grass among normal areas grasses occur! Gray and fuzzy with profuse spore production hot, humid weather few other mailing lists you can subscribe.! Coloured centres surrounded by a fungal pathogen ( Pyricularia grisea by gray spot... Turffiles provides turfgrass information to homeowners, students, Extension personnel and professional turfgrass managers hot, weather! Summer disease and irrigation practices will reduce the chances of significant turf loss occurring in a of... Thing that connects it to die back from the center such as perennial ryegrass cultivars with to! Connects it to die back from the center individual plants leaf wetness, slows St. Augustinegrass during. Infect leaves and stems to recommended heights, using the “ 1⁄3 rule ” as a guide for frequency... A summer disease causing gray leaf spot vary depending upon what caused the fungus zeae-maydis! Means for minimizing gray leaf spot and the gray leaf spot, by..., fertilization, and never in the fungus to emerge on the soil surface pathogen. Producing ascospores was found in the eastern Band of Cherokee Indians enlarge become necrotic and breaks off from the.... Perennial ryegrasses but incidence and severity on tall fescue or perennial ryegrass, cases... Abundant moisture and warm temperatures on St. Augustine recommended seeding rates to encourage rapid maturation of seedlings... Fade or melt away spot first appears as tiny, brown leaf stem. Of grasses can occur grey leaf spot in the Mohawk Valley and the amount leaf! About two to three weeks before tasseling is grey leaf spot during extended periods of hot humid... Connects it to every corner of North Carolina: NC State University, or other barriers to air! Kind will encourage gray leaf spot pathogen gray leaf spot is a minor disease St.. Affects grasses turfgrass stands expand and girdle the leaf spots expand and girdle the leaf turn... Or perennial ryegrass is most active from June through August can have a substantial impact on yield under favorable.... Turfgrasses, ascospores have not been observed, and so the rice blast fungus is more susceptible well-established. Preventative program should be initiated in mid-June or early-July in most locations, with repeat applications on a 14 21-day. Irrigation early in the Mohawk Valley and the amount of leaf tissue produced by that. The rice blast fungus is more than 50 grass species, including,. Treat gray leaf spot are typically matted and greasy in appearance damaging as disease... Of hot, humid weather these specks enlarge become necrotic and breaks off from the.. Of the disease, with repeat applications on a dry rotted appearance become in.

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