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Symptoms: The typical symptom of red silk disease is a ring-shaped or irregular shape lawn with a diameter of 5-50 cm and a red-brown patch of diseased grass. The diseased grass is watery and quickly died. The dead leaves were scattered between the leaves, causing the mottled grass patches to appear mottled. Red cotton-like mycelia and red filamentous mycelium were produced on the leaves and sheaths of the diseased plants. In the early morning, there were dew or rainy days that were gelatinous and meaty. After drying, they became thin and linear. The disease only infects the leaves, and the death of the leaves begins at the tips of the leaves. Red silk disease can occur at different times of the year and at different locations. Symptoms are variable, especially when red silk or red cotton wool are not produced. Diagnosis is difficult.
Pathogen: The pathogen is Corticium fusiforme (Mcalp.) Wakef., belonging to Basidiomycotina, Mycete, Non-Pneumococcus. The asexual type is (Laetisaria fusiformis Berk), which belongs to the semi-known fungus subphylum, the sclerotium, and the caterpillar.
Incidence regularity: The pathogenic bacteria spend the uncomfortable period on the diseased leaf or diseased body with the mycelium. The mycelium can survive for two years under dry conditions. The pathogenic bacteria are transmitted within a certain range by artifical spores or mycelium bundles through flowing water, machinery, humans and animals. Germination of hyphae or nodule or spores in red silk requires a water film on the surface of the leaf or sheath. Therefore, high temperatures, heavy dew, small amounts of rainfall and fog, and appropriate temperatures are important conditions for disease epidemics, which can cause a large number of initial infestations of pathogens, rapid spread and spread, and can kill grass blades within 2 days. In addition, low temperature, drought, lack of fertility (especially when nitrogen deficiency) and the occurrence of other diseases or the use of growth regulators and other factors that cause turfgrass growth retardation, can promote the serious occurrence of red silk disease. The disease can occur throughout the year, but the general period of serious illness will not exceed several months.
Prevention: 1 Maintain sufficient and balanced soil fertility, and use nitrogen fertilizer reasonably. The pH of the soil should generally be maintained at 6.5-7.0; timely watering, watering should be deep poured, minimize the number of watering, to avoid watering in the afternoon. The trees and shrubs around the lawn, or the design scenery, must be carefully laid out to increase the sunshine and air convection. Appropriate pruning, and timely collection of cuttings when the centralized treatment to reduce the amount of bacteria. 2 plant disease-resistant grass species and varieties; on the basis of scientific conservation management, carry out necessary chemical control.
Red silk disease is also called red line disease. Widely distributed in cold and temperate regions around the world. Seriously endanger a variety of turfgrass, especially in the lack of nitrogen fertilizer on the turf disease is particularly rampant. Caused by red silk sickness is also called red line disease. Widely distributed in cold and temperate regions around the world. Seriously endanger a variety of turfgrass, especially in the lack of nitrogen fertilizer on the turf disease is particularly rampant. Causes grass growth retardation, premature aging, and even death, damaging the lawn landscape.