Aquila Cycling
Kentucky Blue Grass Disease
Kentucky Blue Grass Disease
Disease resistant cultivars have been developed to resist the fungus Helminthosporium, once a major problem with the Kentucky bluegrass. New varieties are developed to meet the disease took its place. Breeding and culture in their own right are the best ways to prevent disease. Because similar symptoms, two conditions that often attack Kentucky bluegrass, summer patch and necrotic ring spot, once grouped under a crust.
Necrotic Ringspot
The necrotic ring spot disease is a patch of Kentucky bluegrass and is caused by the fungus Leptosphaeria korrae. The disease is usually in the cold and wet weather in April and May The first onset of symptoms in the summer like spots of 1-1/2 to 3 feet wide blue-green, grass parched brown and die quickly. Community health herbs often at the center of these plates, given the emergence a frog's eye. The roots of the lawn are affected underground cavities. The best prevention is to maintain a healthy lawn so it is very disease resistant. Irrigation contributes to the light in the affected areas generally contributes to the maintenance healthy turf.
Control Strategies
Tensions that may influence the development of disease are excessive straw, fertilizer, temperature and covered with grass, and the wrong time of fertilizer application, cutting height low and low soil pH. Each these tensions can be reduced through proper culture as described below.
Correct acidity by liming the soil above annually to maintain a pH of 6.2 to 6.6. Not apply, even small amounts of fertilizer during the period June-August stress, which tends to encourage the disease. Therefore, only fertilize in the fall (September-November) and late spring (May).
Deep watering is essential for proper root growth. Groundwater in areas prone to the disease at a depth of 3 to 5 inches every 7-10 days during dry periods in summer. Disease susceptibility in the grass is higher than the cutting height is less. Mowing height from 2.5 to 3.5 inches, and they quite often less than 1 / 3 of the blade blade is removed during each cut.
Straw (the layer of organic material between the surface and the grass green) should not be more than 1 / 2 inch thick. Thatching the use of bio-enhanced Dethatcher liquid.
Kentucky bluegrass cultivars such as Adelphi, America, Aspen, Columbia, Eclipse, Glade, Midnight, Nassau, Parade, Ram I, Sydsport, Touchdown, Vantage, Victa and Windsor are less sensitive to necrotic ring spot than others. Seed mixtures of a variety resistant to one or more cultivars also desirable. Mixture 10-15% (by weight) of seeds of perennial ryegrass in the seed of bluegrass to prevent it from happening. Ryegrass can be planted in the grass existing.
Summer Patch
Summer patch is caused by Kentucky bluegrass fungus Magnaporthe poae. The fungus is active in 77 to 86 degrees warm, moist soil. The fungus causes root rot, leading to inadequate water high grass, which makes the grass withers. They appear in mid to late summer. These are crescent-shaped or circular. Dying grass on the edges of patches may have a slight bronze color. Healthy lawn patches sometimes appear in the center. Symptoms are more severe in the hills, slopes and the parties dry grass. The cold will help the grass recovers. The festering fungus in the roots of a number of weeks before the symptoms manifest on the surface. The grass is with the patch was not to be watered frequently since the fungus thrives in moist soils. Let the soil dry out between waterings. Symptoms of the spot was often diminish with regular use of sulfate of ammonium chloride and ammonium.
Management Strategies
Tensions that may influence the development of the disease are excessive straw, fertilizer, temperature and covered with grass, and incorrect timing of fertilizer applications, low-cut height, and ends pH. Each of these tensions can be reduced through good cultural practices are described below.
Severity of the disease may progress to a higher pH, so try to keep the soil and rhizosphere pH of 5.5 to 6.0. The use of acidifying fertilizers when the pH is above 6.0, and try to avoid the use of which may increase the pH.
For most bluegrass lawns, two to five pounds of nitrogen/1000 feet square is sufficient. Apply this in a balanced fertilizer with phosphorus and potassium. Do not apply, even small amounts of fertilizer during the period June-August stress, which tends to encourage disease. Therefore, only fertilize in the fall (September-November) and late spring (May).
Deep watering is essential for proper root growth. Groundwater in areas prone to the disease at a depth of 3 to 5 inch every 7-10 days during periods of summer drought. Soaker hoses are very useful for supplemental irrigation on steep slopes where other sprinklers are ineffective. The harmful effects of excessive temperature can be reduced by a view of the irrigated area to noon.
Susceptibility to disease in the grass is higher than the cutting height is less. Mow up to 2 to 4 inches, and often enough so that less than 1 / 3 of the blade is removed during each cut.
Straw (the layer of organic material between the surface and green grass) must not exceed 1.5 cm (1 / 2 inch) thick. Thatching the use of bio-enhanced Dethatcher liquid.
Kentucky bluegrass cultivars such as Adelphi, America, Aspen, British, Eclipse, Glade, Midnight, Nassau, Parade, Ram I, Sydsport, Touchdown, Vantage, Windsor, and Victa are less susceptible to summer patch others. Seed mixtures of cultivars resistant to one or more varieties also desirable. Mixture 10-15% (by weight) of seeds of perennial ryegrass in the seed bluegrass prevent it from happening. Ryegrass can be seeded into existing turf.
Rhizoctonia yellow patch
Rhizoctonia yellow patch is a serious fungal disease of Kentucky bluegrass caused by Rhizoctonia cerealis. The disease often occurs in wet, cold and the new grass that is grown in heavy soils. The disease is characterized by a light yellow-green patches 2-3 inches in size is rapidly increasing and starting to brown. The edges of the blades are red or red-violet. The best preventive measures include reducing Irrigation and ensure that the soil is well drained and aerated.
Administration
The use a slow-release fertilizer to ensure that moderate amounts of nitrogen will help reduce the possibility of the yellow spot. Reduce the period of leaf wetness will also prevent yellow stain. Watering at night can increase the length of moisture leaves and cause disease. Allow air movement to help dry the grass when wet. Remove excessive thatch and aerate. Be sure to cut the grass is cut high and dry in the morning because of the long grass to cure the leaves. Cut increases further the possibility of yellow spot and a dull mower blade.
Powdery mildew
Powdery mildew caused by Erysiphe graminis and other fungi is presented as a white powder coat gray powder on the surface of the sheet. As the spots become larger to together to form a carpet of mold that looks like dirt or dust. Powdery mildew is a problem with cultivars Baron and flyking Merion Kentucky bluegrass that grow in the shade. Warren and seeds are varieties adapted to shade. The treatment of powdery mildew with fungicides triadimefon, fenarimol and propiconazole, among others.
Treatments
There are several biological treatments control powdery mildew. Milk contains salts and amino acids beneficial to plants and the fight against the disease. To use, mix 1 cup skim milk with 9 cups of water and gas in the infected areas every two or three days. Make a spray of 1 tablespoon Tea. baking soda in a gallon of water and gas in the infected areas every three to five days.
Organic Neem oil is a broad spectrum fungicide. Mix 2 tablespoons. and 1 1 / 2 c. Tea. soap per gallon of water. Spray all plant surfaces including the underside of leaves until wet.
Cleanliness is the key. Gather all the fallen leaves and flowers that are affected and placed in the trash. No fertilizer.
Charcoal stripe
Bands of coal, caused by a variety fungus produces yellow-green spots that turn gray. The gray lines are broken, exposing masses of black spores. The disease destroys the grass leaves, which turn brown and die. Coal bands usually strikes in the cooler weather spring and the grass dies in the hottest of the summer. Merino is a very sensitive cultivar Kentucky bluegrass. Many varieties have been developed to withstand some degree charcoal stripes.
Management Strategies
Some varieties bluegrass survive the effects of the disease than others. Merion Kentucky bluegrass, for example, is very sensitive to coal strip while Park and Newport are tough enough. Other varieties are more resistant A-20, A-34, Aquila, Baron, Birka, Bonnieblue, Fylking, Geary, Glade, Nugget, Pennstar, South Dakota certificate Sydsport, Vantage and Victa.
Optimal fertilization with a complete (not just nitrogen) fertilizer and irrigation helps to maintain awareness the strength of the base and increase the survival of infected plants.
Gray snow mold
Gray snow mold (Typhula red) occurs in areas round up to 2 meters wide in the snow. When the snow melts, the patches of infection are usually entangled and surrounded by a halo gray to white, fluffy fungal growth. This disease rarely kills the grass, is found more often in creeping bluegrass. Fungicides containing the active ingredients of the substance, thiophanate-methyl, chlorothalonil and propiconazole, among others, can be used for the treatment of snow mold.
Disease Cycle:
Snow molds remain dormant during the hot months, when the disease other fungi are more active. They survive on straw and plants as sclerotia (gray snow mold) or son of mycelium (pink snow mold). In the fall, sometimes Typhula species produce small, white or pink, rod-shaped spore-producing structures that can be seen between the blades of grass in a lawn that has not been recently cut. Grow sclerotia that have taken place the previous winter for survival during the summer.
As the weather grows cold and damp, fungi begin to grow and infect the plants grasses. Like all living organisms, these fungi need moisture to survive. The cold, dry air of winter prevents active growth. The shelter of leaves, snow cover or any other on the grass holds moisture for growth. Optimal conditions for the activity of snow mold is caused when the snow falls suddenly and remains on land that has not been frozen. In such cases, the grass is still often exuberant, offering excellent food base for fungi.
Cultural Management:
The most important way to prevent or reduce the problems of snow mold in the maintenance of the lawn grass at the end of the summer season. As long as the grass continues to grow, must be cut. Caen fertility programs should be programmed so as not to affect the ability of grass to become dormant for the winter season. Fall fertilizer should be applied more than six weeks before dormancy, or that should be applied after increasing limb ceased but while the grass is still green. Adding fertilizer nitrogen, just before the grass becomes dormant stimulate a burst of growth late succulent green grass so vulnerable to injuries caused by frost winter, ice or cold exposure and also provide for snow mold susceptible host plants. This is particularly dangerous occurs when an early snowfall.
Because snow mold activity is higher under the covers to keep moisture, leaves and other materials should be removed from the grass. Furthermore, it is best to avoid the accumulation deep snow along the sidewalks and roads, forming a snow bank a long time. In areas of lawn, the strategic placement of fences and plants garden snow may prevent the drift of the deep snow. In the spring, rake leaves and the tangle of damaged areas to allow new growth to begin.
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