Diseases and their control of Salvia splendens

Red sage leaf virus disease

symptom

When the plant is infected, the main symptoms are on the leaves, with dark and light mosaic or mottled spots. The leaves become wrinkled, smaller, and brittle. The plants become dwarfed and clumped, and the flower spikes become shorter. Aphids are closely related to the occurrence of diseases. In addition, grafting can also transmit viruses.

Prevention and treatment measures

During the growing season, it is necessary to prevent and control aphids. Use 1000 times diluted 40% Dimethoate, 1000 times diluted 50% Marathon or 1000 times diluted 90% Trichlorfon for prevention and control. Remove surrounding weeds to reduce sources of infection. Destroy diseased plants promptly. In the early stage of the disease, 400 times diluted 20% Virus Ling can be applied about 2-4 times. Choose healthy plants as seed mother plants or choose seed propagation.

Leaf spot and downy mildew of Salvia splendens

symptom

Leaf spot disease is caused by factors such as ground moisture, temperature, severe shade, and long-term lack of ventilation, which causes the leaves of the impatiens to rot. Measures should be taken in time.

Mildew blight is a devastating disease of salvia officinalis. It has a wide range of damage and will affect the flower stems, branches and leaves. It has a high incidence rate and develops rapidly, causing the death of a large number of flowers. After the plant is infected, in the early stage of the disease, water-soaked, dark green, irregular spots will appear on the infected parts of the stem, which will then gradually expand and spread upward. In the later stage of the disease, the spots turn dark brown with unclear edges. It will soon spread to the middle part, and even spots will appear on the top. When the disease is serious, the entire stem will turn black. Leaf damage mostly occurs at the leaf margins and bases, and leaves wilt when petioles are damaged.

Prevention and treatment methods

Mainly control the humidity and avoid planting too densely. During the rainy season, do a good job of drainage and potting, and pay attention to ventilation. When watering, prevent soil from splashing onto the leaves. Water the leaves less. Destroy diseased plants promptly. In addition, about 5g-10g of 70% pentachloronitrobenzene powder can be sprayed every day to disinfect the soil, which can help prevent the spread of the virus. In the early stage of the disease of Salvia officinalis, you can apply 600 times of mancozeb wettable powder or spray 700 times of 75% thiophanate-methyl wettable powder, and you can also spray the soil at the same time.