It is especially troublesome in shaded areas that remain damp for some time. Managing leaf wetness is an effective means for minimizing gray leaf spot in all hosts. This enables us to improve your future experience on our website. It is more likely to develop in regions which experience high humidity levels and temperatures of 26-32 C. What damage or effects will Gray Leaf Spot have? Gray leaf spot, caused by the fungus Cercospora zeae maydis is the most significant yield-limiting disease of corn worldwide [1].The disease was first reported in Illinois in 1924, and has increased in prevalence throughout corn growing regions since 1988. N.C. Collect clippings when gray leaf spot is active to reduce further spread of the disease. Collecting clippings reduces spread of the disease when gray leaf spot symptoms are evident. Under these conditions, the disease causes serious thinning of the turf. It is caused by a fungal pathogen (Pyricularia grisea) that readily infects and kills leaf blades. In Harvey . The earlier the infection occurs, the more time there is for secondary spread and leaf d… The fungus causing gray leaf spot overwinters in and on corn debris left above and on the soil surface. If conditions favor disease development, economic losses can occur. Mow to recommended heights, using the “1⁄3 rule” as a guide for mowing frequency. Chrysanthemum white rust is a disease of plants caused by... We would like to use cookies to better understand your use of this website. Gray Leaf Spot Outbreak. In time, the leaf spots expand and girdle the leaf, causing it to die back from the tip. When the leaves are wet or humidity is high, the leaf spots turn gray and fuzzy with profuse spore production. This photo from a reader is one of the worst examples I’ve ever seen. In the 1960s and 1970s, the disease became of concern in the eastern United States. We also have a few other mailing lists you can subscribe to. . In this section you will find case stories and expert advice specific to the golf industry. These specks enlarge become necrotic and breaks off from the center. Epidemics of gray leaf spot have been observed in New York State in the Southern Tier and the Hudson River Valley. 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. However, individual isolates of the fungus are limited to infecting one or a few ho… Learn More About NC State Extension, We have several topic based e-mail newsletters that are sent out periodically when we have new information to share. In turfgrasses, ascospores have not been observed, and the gray leaf spot fungus is referred to as Pyricularia grisea. These are blown by wind onto the lower leaves of the present season's corn plants. Stress of any kind will encourage gray leaf spot development in tall fescue and perennial ryegrass. Gray leaf spot lesions on corn leaves hinder photosynthetic activity, reducing carbohydrates allocated towards grain fill. What separates NC State University from other schools? In grasses other than maize it is caused by Pyricularia grisea, which only infects perennial ryegrass, tall fescue, and St. Augustinegrass in places with warm and rainy climates such as Florida. Brown specks scattered through the leaf surface is a characteristic symptom of gray leaf spot. Tomato gray leaf spot control is actually quite simple provided you practice good cultivation and hygienic routines. Turfgrass hosts vary widely in their susceptibility to damage from gray leaf spot. However, the lesions reduce the amount of photosynthetic areas on leaves available to St. Augustinegrass is most resistant, and rarely sustains significant damage if properly managed. Gray leaf spot on tomatoes is a classic example and is one of the many diseases that can strike plants in the nightshade family. 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. On St. Augustinegrass, grey leaf spot first appears as small, brown spots on the leaves and stems. The relationship between the amount of leaf tissue affected by gray leaf spot and the amount of yield loss is unclear. 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. Grey Leaf Spot first appears as tiny, brown leaf and stem lesions, which enlarge rapidly into round to oblong spots. Gray leaf spot disease can be managed by watering early in the morning, limiting use of … Brown to reddish-brown lesions and streaks may be associated with some fescues and ryegrasses. When the leaves are wet or humidity is high, the leaf spots turn gray and fuzzy with profuse spore production. 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 . The gray coloration in the center of the lesions is a flush of spores produced after incubation at 100% relative humidity for 24 hr. Most of the time in Australia, Gray Leaf Spot is a minor disease of turf. NC State University and N.C. A&T State University work in tandem, along with federal, state and local governments, to form a strategic partnership called N.C. Leaf spot symptoms of gray leaf spot are shown on a St. Augustinegrass leaf blade. Cause and Symptoms: Gray leaf spot develops rapidly with abundant moisture and warm temperatures on St. Augustine grass. Mature lesions are tan to grey with purple to brown borders. Gray leaf spot is a foliar disease that affects perennial ryegrass and tall fescue. Find out about symptoms and management. The spots quickly enlarge to approximately 0.5 cm in length and become bluish-grey in colour and oval or elongated in shape. NC State Extension is the largest outreach program at NC State University. Proper mowing, fertilization, and irrigation practices will reduce the chances of significant turf loss from this disease. When establishing a new stand of tall fescue or perennial ryegrass, use recommended seeding rates to encourage rapid maturation of new seedlings. Because of this symptom, gray leaf spot is often confused with Pythium blight in tall fescue and perennial ryegrass. Gray Leaf Spot – Corn 6-15 1 Gray Leaf Spot – Corn Gray leaf spot (GLS) is a foliar disease of corn caused by the fungus Cercospora zeae-maydis. Schedule irrigation early in the morning, before sunrise, and never in the late afternoon or evening. Want to see which lists are available? Generally, during humid and warm weather infection of grasses can occur. Leaf infections can progress into the crown area, resulting in death of individual plants. Information available on this site is provided by faculty and staff in the Departments of Crop and Soil Sciences, Entomology and Plant Pathology, and Horticultural Science at NC State University. Where will you find Gray Leaf Spot? A preventative program should be initiated in mid-June or early-July in most locations, with repeat applications on a 14 to 21-day interval. Tall fescue should be monitored frequently for gray leaf spot development so that fungicides can be applied to stop epidemic development. Figure 1. Gray leaf spot does not develop in distinct patches in St. Augustinegrass, but affected leaves may wither and die, causing a brown cast to the turf that is visible from a distance. Leaf lesions may be confused with those caused by grey leaf spot. Since perennial ryegrass can sustain serious damage in a short period of time, preventative fungicide applications are recommended for gray leaf spot control. North Carolina citizens each year through local centers in the state's 100 counties Lush leaf tissue produced by turf that is fertilized with excessive nitrogen is extremely prone to infection by the gray leaf spot pathogen. Apply nitrogen and other nutrients as recommended to maintain vigorous foliar growth during the summer months. Gray leaf spot is most severe in newly established turfgrass stands. Leaf spot is a fungal disease but can also be caused by bacteria. In time, the leaf spots expand and girdle the leaf, causing it to die back from the tip. Detailed information about the use of cookies on this website and how you can manage or withdraw your consent at any time can be found in our necrotic spots can also merge causing collapse of large areas of the leaf tissue. The most frequent of these diseases, gray leaf spot, has been increasing in economic impact in many regions of the world over the past 10 years. 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. The tip often confused with Pythium blight in tall fescue is actually quite simple provided you practice cultivation. Extension factsheet can also be viewed at: you will automatically get notified when we post news to this.. And oval or elongated in shape leaf blade through September sustain serious damage in period... 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