The fullback kentucky bluegrass variety exhibits super elite performance across trials. G19 necrotic ring spot and summer patch diseases in turfgrass. Summer patch or necrotic ring spot first appears in kentucky bluegrass turf in light green patches that soon enlarge and rapidly fade to a dull reddish brown, then a light tan, and finally to a light straw color courtesy w. If you manage your turf properly, it can recover quickly from brown patch. Kentucky bluegrass, fine fescue, annual bluegrass fertility is an important management aspect for summer patch. Kentucky bluegrass, annual bluegrass, fine fescues. Primary symptoms initial symptoms on kentucky bluegrass are roughly circular strawcolored patches of turf that may resemble another turf disease called dollar spot. The summer patch fungus begins to attack the roots, stolons, and rhizomes in the spring when soil temperatures reach 65f. Necrotic ring spot and summer patch symptoms are virtually indistinguishable, and both diseases are difficult to control. Magnaporthe poae introduction kentucky bluegrass poa pratensis, annual bluegrass poa annua, and fescues festucasp. It will also affect annual bluegrass and creeping red fine fescue. Summer patch close mowing has been shown to aggravate summer patch.
Adequate levels of nitrogen are essential in managing summer patch. This disease affects kentucky bluegrass and annual bluegrass. These are pictures of summer patch on kentucky bluegrass at the horticulture research station. Kentucky bluegrass annual bluegrass creeping bentgrass.
Compared to summer patch, the necrotic ring spot pathogen is more aggressive less dependent on stressing factors, and the symptoms are often observed under cooler temperatures and in cooler regions of the united states. Patch diseases in kentucky bluegrass lawns plant pathology. Patches enlarge into irregular, yellow to bronze colored areas ranging in size from. Below ground, roots and crowns of affected plants are brown and decayed, a result of fungal colonization.
Summer patch appears as circular yellow or tan areas up to 1 foot in diameter, consisting of dead and dying plants. Fast germination and quick establishment makes it the perfect bluegrass for new stands or overseeding. Summer patch is a serious disease of poa annua and kentucky bluegrass. Characteristic symptoms of the disease are rings of affected turf that. It will show up in the form of irregular brown patches, rings, and crescent shapes. Keep a relatively high mowing height in lawns where summer patch develops. Summer patch is difficult to diagnose by symptoms alone. Summer patch, caused by the fungi magnaporthe poae, is showing up on kentucky bluegrass turf at the research station in central iowa in. Mercury kentucky bluegrass has the high shear mercurymercury. These patches may grow to form ring or crescentshaped patches 3. Kentucky bluegrass, fescues, annual bluegrass, bentgrass. Summer patch of bluegrasses umass center for agriculture. The causal agent of summer patch, the soilborne fungus, magnaporthe poae. Summer patch nc state extension turffiles nc state university.
Light green in color it is most obvious in the early spring when it grows more rapidly than other turfgrasses. Summer patch disease symptoms evident now horticulture. Occasionally, kentucky bluegrass lawns can be affected by brown patch, although this grass is less susceptible than others. It is one of the most important causes of summer death of annual bluegrass. Glyphosate will kill any plant the spray contacts so apply carefully. Pathogen and symptoms the pathogen a fungus, magnaporthe poae is active in spring and colonizes the roots. Summer patch first appears in the warm weather of summer as yellow to bronzecolored, irregularshaped patches ranging from 6 in.
In the national turfgrass evaluation program ntep tests, hgt actually took over some heavily affected neighboring. Symptoms occur later in the summer during high temperatures. Tested intensively on many locations across the country and in university trials, hgt stood out for its resistance to summer patch. This is likely due to the fact that more people are growing varieties of kentucky bluegrass with better tolerance to this disease than was the case 20 or more years ago. As temperatures rise in the summer its growth will slow and it often goes semidormant until cooler temperatures and rainfall return in the autumn. Landschoot and jackson identified the summer patch pathogen as m. This lawn disease thrives in sunny, hot lawns and appears most readily in short grass. Summer patch is most likely to be seen in weather of 90 degrees or higher.
Brown patch is most destructive when the weather is humid and temperatures are stressful to the grass. Nrs appears in the spring or late summer months during cooler weather irrigation or rainfall is necessary. Summer patch long winter dormancy many susceptible to stem and leaf rust arcadia excellent seedling salt tolerance, high sod strength, high wear tolerance quantum leap high drought tolerance, high performance all. Summer patch caused by magnaporthe poae is a highly destructive disease of poa species and fineleaved fescues. The superior performance is shown in that many a new cultivar have been developed to try and emulate it, but it continues to be top rated in the newest ntep. Roughstalk bluegrass poa trivialis is a coolseason perennial grass often considered a weed. Summer swelter stresses iowa lawns horticulture and home. Symptoms of the disease first occur in the warm weather as small circular patches of slowgrowing, wilted, and thinned turf. Vascular discoloration and cortical rot occur in later stages of the disease. See fullback bd 0384 in the 20062010 ntep kentucky bluegrass trial at. Summer patch affects kentucky bluegrass and annual bluegrass on all kinds of turf venues, including golf courses, athletic fields, professional landscapes, and residential lawns.
As scotts most coldtolerant grass seed mix, it has the ability to selfrepair from heat, drought, and hightraffic damage. Fielder kentucky bluegrass sptr 2959 poa pratensis with excellent wear tolerance and high turf quality is an ideal choice for all bluegrass blends. Magnaporthe poae is an ascomycete fungus which causes the turfgrass disease commonly known as summer patch, or poa patch. Necrotic ring spot most commonly occurs when wet weather is followed by hot, dry periods. It is called brown patch in tall fescue or zoysiagrass and summer patch in kentucky bluegrass.
Susceptible grasses the most commonly infected grasses are kentucky bluegrass and fine leaf fescue. It can affect many types of lawn grasses, including bentgrass, kentucky and annual bluegrass, and fescueespecially when cultivars are unsuitable for local conditions. Summer patch symptoms are rarely seen during the early stages of disease development, instead, the symptoms appear in midsummer. Cutting that much length from a lawn that has been left to grow long is known as scalping the grass, and is the cultural practice most closely associated with the occurrence of summer patch because it weakens the grass. It is an excellent summer performer under sever summer stress, and will persist indefinitely under demanding turfgrass conditions. Kentucky bluegrass lawns are normally mowed between 2 and 3 inches. It can decimate kentucky bluegrass lawns and athletic fields and annual bluegrass putting greens. Summer patch is a turfgrass disease caused by the fungus magnaporthe poae. Weakened plants with slow growth were often overcome by brown patch and pythium diseases that flourished when.
It has excellent drought tolerance with rapid recovery. Apr 15, 2019 to control roughstalk bluegrass in coolseason lawns and athletic fields, nonselective control with glyphosate roundup and others followed by reseeding is the best option. Patch diseases in kentucky bluegrass lawns paul vincelli extension plant pathologist figure 1. Roots, crowns, and stolons are affected by a dark brown rot. Some patches may have circles of green grass in the center, sometimes called frog eyes. I ol cornell university college of agriculture and life. Lawn problem solver brown patches central sod farms. Blue velvet is recommended for use wherever a premium quality kentucky bluegrass turf is needed. Summer patch as seen from 3m susceptible turfgrass annual bluegrass, kentucky bluegrass, and fineleaf fescue.
Analysis summer patch usually occurs from june through september, when hot, dry weather follows a wet period. Magnaporthe poae causes summer patch of poa species, creeping bentgrass, and fineleaved fescues. Summer patch can be prevented by avoiding cutting more than 23 the length of your grass. Necrotic ring spot nrs and summer patch sp of kentucky bluegrass turf. Young roots may appear healthy, although dark brown hyphae may be present on these tissues. Summer patch, brown patch, leaf spot, and melting out. Mar 17, 2020 hot weather in early july brought on some severe summer patch root disease symptoms in hard fescue. Summer patch affects kentucky bluegrass and annual bluegrass on all kinds of turf venues, including golf courses, athletic fields, professional landscapes, and. Summer patch is seen more often in areas that have heavy traffic, poor air circulation, and inadequate drainage.
The disease also develops in putting greens, especially annual bluegrass. Reseed affected areas with resistant cultivars of kentucky bluegrass. Jul 28, 2010 summer patch is a moderately common turfgrass disease of kentucky bluegrass, annual bluegrass and fine fescues. I am also getting some calls and pictures from people in the state asking about this problem. The disease was first described in 1984 by smiley and cravenfowler. Summer patch symptoms are rarely seen during the early stages of disease development, instead, the symptoms appear in midsummer after considerable damage has been done to the root system. The summer patch pathogen, magnaporthe poae, is active during late spring and summer when turfgrass root growth is diminished. Summer patch is one of the most destructive diseases of kentucky bluegrass. It may also affect bentgrass, but to a much less extent.
Summer patch lawns university of maryland extension. Summer patch of bluegrasses summer patch caused by magnaporthe poae is a highly destructive disease of poa species and fineleaved fescues. Once the mercury starts soaring, so should your mowing height. Kentucky bluegrass is the primary host, but the disease can occur on red fescue and poa annua. This disease on fine fescues hasnt been as thoroughly studied as it has been on other grasses. Summer patch mainly grows in rings and crescents which sometimes join together to form more irregular shapes. Common symptoms, and control measures for summer patch are discussed in this video category.
Mercury kentucky bluegrass has the high shear strength needed for sports fields and sod production from its father, p105, combined with the. Mercury kentucky bluegrass has the high shear strength needed for sports fields and sod production from its father, p105, combined with the shade and drought tolerance from its compact america type mother. But, you have to necessarily keep above 2 inches for kentucky bluegrass. Once summer patch is under control, repair the damaged areas quickly and easily by using an allinone patch and repair mix like scotts ez seed.
Symptoms summer patch appears as circular or irregularly shaped patches that measure from several inches to several feet in width. It has very good resistance to dollar spot, summer patch, brown patch, leaf spot, and melting out. This publication describes summer patch symptoms and discusses a variety of management options. Distinguishing between necrotic ring spot and summer patch can be difficult since these diseases produce similar symptoms.
Summer patch is a root disease of several coolseason turfgrasses. Summer patch magnaporthe poae, or poa patch, is a lawn disease. Reseeding is often necessary after summer patch infestations. Patches may coalesce, resulting in areas of affected turf that are several feet in diameter. This partially explains why crabgrass can overtake kentucky bluegrass as the summer progresses. Summer patch is a moderately common turfgrass disease of kentucky bluegrass, annual bluegrass and fine fescues. It is considered one of the most important diseases on turfgrass in north america. Summer patch can wipe out kentucky bluegrass completely. Summer patch is very dangerous for kentucky bluegrass, annual bluegrass and creeping red fescue lawns. Blue velvet is a low growing cultivar that requires less frequent mowing than most other bluegrasses.
Summer patch summer patch is one of the most destructive diseases of kentucky bluegrass. Circular to irregular patches of dead turf up to 12 feet in diameter develop during hot weather in mid to late summer. Go for 34 inches to give those fine blades of kentucky bluegrass better heat and drought tolerance in summer and in low rainfalldry conditions. Good summer performance very high wear tolerance good leaf spot and stripe smut resistance generally susceptible to brown patch and dollar spot barimpala caliber julia jackrabbit julia type description hybrids between texas and kentucky bluegrasses heat tolerant extensive rhizomes drought tolerant with good recovery. Kentucky bluegrass turf, necrotic ring spot and summer patch. Summer patch caused by magnaporthe poae is a highly destructive disease of poa. See fullback bd 0384 in the 20062010 ntep kentucky bluegrass trial at seeding rate pounds1,000 sq. Infections occur when soil temperatures are consistently at. Summer patch, caused by the fungi magnaporthe poae, is showing up on kentucky bluegrass turf at the research station in central iowa in early july.
Summer patch is caused by a soilborne pathogen that begins infecting turfgrass roots, crowns and rhizomes when midspring temperatures reach 65 degrees f. Summer patch disease symptoms evident now horticulture and. I have observed more damage from summer patch disease on hard fescue turf than kentucky bluegrass this year. Summer patch at horticulture research station turfgrass. The state of kentucky lays claim to the nickname bluegrass state, but kentucky bluegrass didnt originate there. Common symptoms, and control measures for summer patch are discussed in this video. Summer patch showing up on kentucky bluegrass turf at.
Scotts turf builder grass seed kentucky bluegrass mix is a unique mix that performs well in hightraffic areas, under moderate shade, and in sunny areas. Kentucky bluegrass fine fescues creeping red and hard types other types of lawn grass, such as tall fescue, perennial ryegrass, and zoysiagrass, tend to be resistant or immune to the disease. The disease occurs mostly on kentucky bluegrass poa pratensis, fescues festuca sp. Turfgrass disease pests kentucky pesticide safety education. Then, anywhere from early june to late august, strange brown patches appear that only seem to grow in size, even though you water more and more. Raising the mowing height promotes healthier turf with better root development and higher levels of nutritional. Summer patch can affect many types of lawn grasses, including bentgrass, kentucky bluegrass, and fescue. Having adequate levels of all major soil nutrients can be determined by soil testing with the exception of nitrogen. Summer is typically the season of greatest root growth of turfgrasses. Summer patch affects kentucky bluegrass and annual bluegrass. However, if the kentucky bluegrass is being smothered beneath a layer of crabgrass that covers 50 to 100% of the visible lawn surface additional action is needed. It has demonstrated excellent resistance to leaf and stem rust, stripe smut, and powdery mildew. Summer patch is primarily a disease of kentucky bluegrass lawns that is at least two or three years old.
Disease library identify common lawn diseases delaware. Apply glyphosate at this time in early spring, before summer stress, for best control. Summer patch can become severe when turfgrass, especially kentucky bluegrass, is under stress and entering summer dormancy. The causal agent of summer patch, the soilborne fungus, magnaporthe poae, infects the plant roots. Summer patch, the more common disease in kentucky landscapes, develops in middle to late summer. Summer patch necrotic ring spot kentucky bluegrass. Jul 10, 20 these are pictures of summer patch on kentucky bluegrass at the horticulture research station. So recommendations are based on knowledge learned in kentucky bluegrass poa pratensis and annual bluegrass poa annua turfs. Summer patch is caused by the fungus magnaporthe poae. The symptoms of necrotic ring spot are so similar to those of summer patch that the two diseases cannot readily be distinguished outside the laboratory.
Reports and samples of summer patch disease from kentucky bluegrass lawns in ames and des moines have been received over the past few weeks. This is the telltale sign of summer patch and necrotic ring spot photo. The symptoms of summer patch appear in circular patches or rings, ranging from 6. Summer patch usually appears between june and september, during periods of high humidity when daytime temperatures are over 85 degrees. Early green up in spring and aggressive lateral growth. It contains highperformance grass seed, continuous release fertilizer, and superabsorbent growing material to help grow grass wherever you need it. Introduction magnaporthe poae causes summer patch of poa species, creeping bentgrass, and fineleaved fescues. Mf3239 summer patch of bluegrass ksre bookstore kansas. Seedlings of all grasses are more susceptible to infection than established plantings. Tough year for summer patch disease rutgers turf blog. Scotts turf builder grass seed kentucky bluegrass mix. Rutgers turf blog from the center for turfgrass science at. Summer patch causes circular strawcolored patches of grass during the summer. Summer patch occurs during the hot portion of the summer.
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