Common diseases and prevention methods of creeping sedge

Common diseases of creeping grass: Botrytis cinerea

Symptoms

The seedlings infected with gray mold are light in color, and the leaves and petioles are grayish white and water-soaked. The tissues soften and rot, and gray mold grows on the surface when the humidity is high.

Young stems often initially develop irregular water-soaked spots at the base of the petiole, which quickly become soft and rotten, and then shrink or break. Finally, the diseased seedlings rot, wither and die.

Prevention and treatment methods

Manually remove diseased leaves or apply pesticides. The agent can be sprayed with 1000 times diluted 70% methyl thiophanate wettable powder.

Common diseases of creeping grass: Anthracnose

Symptoms

Anthracnose is an important disease that harms succulents and is a fungal disease. It often occurs in hot and humid seasons, especially the hot and humid rainy season, and can also be caused by excessive application of nitrogen fertilizer.

In the early stage of the disease, small brown spots appear on the leaves, which then expand into round or oval shapes. The spots gradually dry up, and in severe cases the entire plant is infected.

Prevention and control measures

The seeds should be selected carefully, and disease-resistant varieties should be selected.

Disinfect the seeds. Soak them in 52℃ warm water for 12 minutes before sowing, and mix them with 0.3% of thiram or 50% of captan wettable powder based on the seed weight.

In the early stage of the disease, you can spray 600 times diluted 75% thiophanate-methyl or 500 times diluted 50% thiram wettable powder, once every 7 to 10 days, for 3 times in a row.

Common diseases of creeping grass: powdery mildew

Symptoms

The diseased parts are leaves, young stems, flower buds and flower buds, etc. The obvious feature is the presence of a grayish-white powdery mold layer (conidia and mycelium of the pathogen) on the diseased area. The growth and development of the affected plants are stunted, the leaves are twisted, and they cannot bloom or the flowers become deformed. When the disease is severe, the leaves dry up and the plant dies.

Pathogen analysis

The pathogen of powdery mildew is Erysiphe graminis, which belongs to the subphylum Ascomycota. Mycelium grows on both sides of the leaves, conidia are columnar, ascocarps are aggregated or nearly aggregated, dark brown, oblate, accessory filaments are unbranched or irregularly branched, curved, asci are long or short ovate, and ascospores are oval or elliptical.

Prevention and treatment methods

Apply more phosphorus and potassium fertilizers appropriately, and pay attention to ventilation and light transmission.

Prune off seriously diseased plants or seriously diseased parts promptly, bury them deeply or burn them to eliminate the source of bacteria.

You can use 800 times diluted 50% carbendazim wettable powder, 500 times diluted 80% mancozeb, and 500 times diluted 75% thiophanate-methyl solution for spraying alternately.