![]() ![]() The roots and crown of the infected plants get discolored The disease is seen in July- August.Ĭause- excessive soil moisture, compacted soil, poor drainage, and mowing too low roots the growth of the diseaseĬircular patches of dead grass with yellow/ orange leaves Host- Kentucky bluegrass, annual bluegrass, fescueįactors favoring the disease occurrence- hot and wet weather with compacted soil favors the disease’s growth. If the severity prevails, apply thiophanate methyl in the late fall. Seeding with different varieties of grass should be done if there is no growth Mow the lawn to a shorter height to minimize the moistureĪvoid application of Nitrogen during fall if your grass is susceptible to snow mold It will reduce the moisture and help the grass to dry quickly. Yellow patches will be formed in severe cases It infects the crown region and is relatively more damaging than Typhula blight. Hosts: Bentgrass, bluegrass, fescue, and Ryegrass White to grey webbing appears on the leaf bladesĬircular patches of light yellow or greyish brown color can be visible in severe damage. Rust lawn diseaseįactors favoring the disease occurrence: overly cool temperature combined with wet conditions, especially places under snow cover, favors the fungi’ incidence.Ĭause: Over-fertilizing with too much Nitrogen in fall, poor drainage, too much shade and extended periods of snow coverage causes the disease. In extreme damage, treat the lawn with fungicides like strobilurins. Nutrient control, proper aeration, and soil improvement may help control the disease for a more extended period. Symptom- as the name implies, the disease can be identified with the appearance of webbing or thread-like fibers of red or pink color on the grass and the grass blade wither from tips. It is a relatively less damaging disease and affects cool-season grasses.įactors favoring the disease occurrence- mild-early spring temperatures and cool-wet conditions with a temperature between 68-75☏ and high humidity favor the growth of this fungusĬause- under fertilizing, high humidity, poor air circulation, too much shade, excess thatch, leaves left wet for an extended period, and compact soil are the reasons for the disease. Host- Red fescue, Ryegrass, Kentucky bluegrass, bentgrass Red thread lawn disease is caused by the pathogen Corticium fusiform. Red Thread Disease symptoms (BY: Kris Lord) Leaves appear slimy by soaking water and stick together.Ĭircles of withering can be seen on the lawn.Īvoid irrigation methods that keep the grass wet for a longer time.įungicides like Captan, Zineb, Kromad, or any mercury-containing fungicide can reduce the disease’s severity. The disease occurs from April- September.Ĭause- excess fertilization and irrigation, compacted soil, and too much shade cause the disease.Ī group of circular spots of 2-inch diameter is noticeable, especially in the early hours of the day. The fungi are damaging in poorly drained soil with 70 oF and above temperature. Grease spot- occurs in a wide range of grasses.Ĭottony blight- occurs mainly on Ryegrass.įactors favoring the disease occurrence- warm temperature, prolonged wet conditions, and high humidity from early summer to fall favors the disease’s growth. Pythium fungi cause two major destructive diseases. Newly planted grasses are more susceptible to this disease. Hosts- Perennial Ryegrass, creeping bentgrass, Kentucky bluegrass, and tall fescue Pythium blight patches in the lawn (By John Kaminski) Use Fungicides like Acti-dione, Tersan, Kromad to control the disease. Irrigation practices should be appropriate. Leaf-blades show white cottony growth in the early hours of the day. The disease is more prevalent when the temperature remains more than 65 oF at night and occurs from May to September.Ĭause: Excessive Nitrogen, over-irrigation, high humidity and the presence of wet leaves facilitate the spread of the disease.Ĭircles of dead, hollow grass with brownish-yellow patches can be seen on the affected parts, ranging from 6-inch diameter to several feet wide. The pathogen affects the cool season lawn grass.įactors favoring the disease occurrence- brown patch disease occurs mostly in warm to humid weather conditions, especially in Spring and Fall. It is a foliar disease that affects the leaf blades, excluding the root and crown regions. Augustine grassīrown patch disease is also known as Rhizoctonia blight and is harmful to Ryegrass and tall fescue. Host- Ryegrass, Kentucky bluegrass, fescue, bentgrass, centipede grass, St.
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