The prevention and treatment of blunt leaf grass spot disease

The prevention and treatment of blunt leaf grass spot disease

Gray spot disease is also called rickets. It mainly occurs on the grass of the genus Blunta, but it can also seriously harm the turfgrass of the genus Bermudagrass, bark grass, gar, etc. Cold-season grasses such as creeping bentgrass, fescue, and pennisetum are occasionally compromised.
Symptoms: At the beginning of the disease, small brown spots appear on the susceptible leaves and stems, and the lesions forming round to oblong shape are quickly enlarged afterwards. The lesions are gray-brown in the middle and have purple-brown edges with yellow halos around or near them. When the weather is wet, the lesions are covered with a gray layer of mildew. Severe disease, the dead leaves. The entire lawn appears scorched, as if it were suffering from severe drought.
Pathogens: The pathogen is Pyricularia grisea (Cook) Sacc., which belongs to the subphylum Aspergillus subsp.
Incidence of disease: pathogenic bacteria overwintering on the body of diseased and diseased leaves with mycelia and conidia (summer). When the temperature and humidity are appropriate, a large number of conidia spread with the wind, water, machinery, animals and so on. When water is saturated in the air and the leaves are moist, the spores germinate on the host foliage and form new infections. High temperature and humidity, excessive nitrogen fertilizer or other stress factors can cause serious harm. The new lawn is seriously ill.
Prevention and treatment: Avoid drought and partial nitrogen fertilizer, prevent soil compaction, careful management, timely chemical control and other measures can effectively control the disease.

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