What are the pest and disease control methods for morning glory?
1. Brown spot disease
Symptoms: When this disease occurs, round or polygonal lesions appear on the leaves, usually dark gray in the center with dark brown edges. Many pale black mold layers form on the surface of the lesions, and in severe cases the lesions cover the entire leaf, causing the leaves to wither.
Control methods: Plant appropriately close together, avoid overwatering, and promptly remove diseased leaves; at the early stage of the disease, promptly spray Guoguang Bixian, once every 7-10 days, spraying 2-3 times continuously is sufficient.
2. Damping-off
Symptoms: Morning glory naturally grows prostrate, but damping-off can also occur. When the disease occurs, the entire plant droops and lies flat on the ground, and the leaves gradually turn yellow and rot.
Control methods: Once the disease occurs, promptly pull out and remove diseased plants, use agents such as Previcur, Yishuangling, and Genbingzhi for soil drenching, or use 800-1000 times diluted solutions of chlorothalonil or thiophanate-methyl for control.
Pest and disease control for morning glory
Morning glory (Pharbitis nil (L.) Choisy), belonging to the genus Pharbitis in the Convolvulaceae family, is an annual twining herb. The flowers of this plant closely resemble a trumpet shape, so in some places it is called trumpet flower. Morning glory is generally sown in spring, blooms in summer and autumn, and has many varieties. Flower colors include blue, crimson, pink, and purple, as well as mixed colors, with considerable variation in petal edges, making it a common ornamental plant. The fruit is ovoid and can be used medicinally. Morning glory leaves are three-lobed with a heart-shaped base. The flowers are white, purplish-red, or purplish-blue, funnel-shaped, and the entire plant is covered with coarse hairs. The flowering period is most abundant in summer. The seeds have medicinal value. The main disease is powdery mildew. After being affected, the stems and leaves become distorted and shrunken; once discovered, promptly pull them out and destroy them, and spray 500 times diluted 50% carbendazim solution. The main pest is aphids. Spray 800-**** times diluted 50% dichlorvos solution. For other control methods, refer to the pest and disease control sections for cineraria, scarlet sage, and Chinese rose.White rust control
[Symptoms] The affected parts are mainly leaves, petioles, and tender stems. On affected leaves, light green small spots initially appear on the leaves. They gradually turn pale yellow with indistinct edges, and in severe cases expand into large lesions. Later, white scar-like protrusions form on the underside of the diseased area, and when they rupture, white powdery material is released, which consists of the pathogen's cystospores. When tender stems are affected, flowers and stems become distorted. When lesions surround the petiole or tender shoot, the host parts above the girdle grow poorly, shrink, and die.
[Pathogen and disease occurrence pattern] The pathogen is Albugo ipomoeae-panduranae, a fungus belonging to the genus Albugo. The pathogen overwinters in diseased tissues as oospores. In the following spring, the oospores germinate and produce sporangia, infecting morning glory and other Convolvulaceae plants. The peak disease period is generally from August to September. Morning glory seeds can carry the pathogen and become the infection source for the following year.
Pay attention to preventing damping-off at the seedling stage, especially during the seedling phase. In addition to proper disinfection work, sparse sowing, sufficient light, good ventilation, suitable temperature, and not excessive waterlogging can also greatly reduce the chance of disease. Once the disease occurs, promptly pull out and remove diseased plants, and use agents such as Previcur, Yishuangling, and Genbingzhi for soil drenching, which is generally easy to control. When sowing at high temperatures, also prevent rot during the seedling stage. After the seedlings mature, diseases generally do not occur easily, but due to the influence of the cultivation environment, some diseases may still occur, such as gray mold, fusarium wilt, and physiological diseases. Prevention should be the main approach, and a mixture of carbendazim + streptomycin can be sprayed once every 7 to 10 days. Once disease occurs, timely and targeted treatment should be applied according to actual conditions. For pests, pay attention to preventing aphids, red spider mites, and cabbage caterpillars, with particular attention to controlling leafminers. Observe carefully and spray relevant agents promptly at the early stage of pest occurrence, which is generally easy to control.
[Control methods]
① Promptly pull out and destroy diseased plants. This reduces infection of seeds.
② Select and retain disease-free seeds as propagation seeds, and disinfect seeds before sowing. Avoid crop rotation with Convolvulaceae plants.
③ At the early stage of disease, spray 1% Bordeaux mixture or 500 times diluted 50% Yimeijing solution, once every 10-15 days, for better control results.
Morning glory pests and diseases and control methods
Morning glory brown spot disease
When morning glory is affected, round or polygonal lesions appear on the leaves, with a dark gray center and dark brown edges. Many pale black mold layers form on the surface of the lesions, and in severe cases the lesions do not cover the entire leaf, causing the leaves to wither.
Control methods: Plant at appropriate density, avoid overwatering, and promptly remove diseased leaves when found;
At the early stage of the disease, promptly spray Guoguang Bixian, once every 7-10 days, spraying 2-3 times continuously is sufficient.
Morning glory damping-off
Morning glory naturally grows prostrate, but damping-off can also occur. When the disease occurs, the entire plant droops and lies flat on the ground, and the leaves gradually turn yellow and rot.
Control methods: Once the disease occurs, promptly pull out and remove diseased plants, use agents such as Previcur, Yishuangling, and Genbingzhi for soil drenching, or use 800-1000 times diluted solutions of chlorothalonil or thiophanate-methyl for control.
Morning glory pests
Morning glory grown at home has relatively few pests, and unless your home is particularly messy, pest problems rarely occur. Common pests of morning glory include: aphids, leaf roller moths, red spider mites, and cabbage caterpillars. Observe carefully during maintenance, and spray relevant agents when pests are found. (Click to learn specific pest control methods?Flowers also suffer from being attacked by pests）