The turf is also vulnerable when it becomes stressed, usually resulting from excessive nitrogen and water applications or when the grass is mown short and is in shade. The turf is vulnerable when the stress is present, resulting from excessive water and nitrogen applications or when the grass is mown shorter. The first symptoms are noticed as small leaf spots on leaf blades. There are a number of resistant turfgrass cultivars available, so susceptible cultivars should be avoided. Cool, wet weather during spring, followed by drought, during the summer accentuates the damage from this disease. These pustules are orange-red, bright-yellow, reddish-brown or black in color. The "leaf spot" diseases are widespread on cool and warm-season turfgrasses and are caused by many different genera of fungi. Understanding this cycle will enable you to understand how the pathogen can be controlled by effective management to break the cycle of disease. Don’t worry. Ascochyta can occur throughout the growing season, but is more prevalent in the spring when there are extended wet periods. These diseases occur on leaves, however, some of them may occur on fruits and stems. Leaf disease is the most common disease. The leaf spot pathogen, Bipolaris sorokiniana, attacks bluegrasses, bentgrasses, ryegrasses, and fescues. There have not been any comments left on this post. Leaf spot disease can be prevented by making sure that you don’t cut the grass too low. Do you have troubles with leaf spot disease right now and you need a lawn care company like. If left untreated, it can reach the melting out stage. Only specific fungicides are effective against the leaf spot disease. The fix: Water deeply but infrequently, and water in the early morning hours so leaves won’t stay too moist for too long. Expect somerefusal from animals. Spores are spread by wind, water, and by traffic. Maintain Soil pH between 5.8-6.5; do not allow the soil to become alkaline. Melting out, cause by Drechslera poae , is the most serious disease of Kentucky bluegrass and also occurs on ryegrasses and fescues. (Reduction of thatch by hollow coring and scarification). Initial symptoms often appear as tiny pinprick lesions, which often go unnoticed or are mistaken as another less aggressive disease. Raising the mowing height and applying nitrogen fertilizer in the early fall will contribute to a healthier lawn. Dormant and active pathogens are able to survive for long periods among infected debris found in the thatch layers of the turf. Also, avoid overwatering infected grass and make sure to aerate the soil in order to stimulate water drainage during wet and rainy conditions. Remove all debris from the plants each spring to prevent leaf spot. Leaf Spot. Leaf spot is a common turf disease caused by bacteria and fungi. You aren’t seeing the disease pathogen, but a symptom caused by the pathogen. Grey Leaf Spot is one of the common problems we encounter in early summer on St. Augustine grass. Some nematodes also cause plant disease. Both melting out and leaf spot disease occur when dry weather and high temperatures alternate with wet periods, cloudy weather, and moderate temperatures. Water in the morning so turf can dry out quickly. 4. There is a problem with your comment, please see below and try again. It is important to rotate the fungicide products you are using to make sure the fungus in your lawn doesn’t become resistant to certain products, leaving you with aggressive turf disease. The symptoms vary depending on the severity of the disease, which is often defined by the type of fungi involved. There are no legal, effective or economical fungicides to control leaf spot in foragebermudagrass. Houston Grass South Owner Michael Romine talks about gray leaf spot in established lawns and how to treat the fungus in this video. Melting out and leaf spot are usually mentioned together. The pathogen also attacks many genera of warm season turfgrass, as well as Festuca species. Melting out is a different disease also caused by fungi in the same group. Inspect and monitor existing surface water drainage systems; ensure that they are working. Spotted leaves occur when fungal spores in the air find a warm, wet, plant surface to cling to. (previously classified as Helminthosporium fungi) that is active over a wide range of temperatures.At any given time of the year, at least one species within this fungal group can be isolated. The leaf spots are tan to gray, often depressed at the center, with irregular purple to brown margins. Leaf spot is caused by fungi and often affects many types of grass. However, it is important to understand when and how to treat this. Infection in the crown of the plant during the summer can lead to the death of plants (thus "melting-out"). Reduce the return of clippings. 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