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! 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