Prevention and control of diseases and insect pests of eight Immortals
The disease and insect pests of the eight Immortals prevent and control the symptoms of green petal disease of the eight Immortals: the plant is short and atrophied; the color of the inflorescence decreases, the petals usually turn yellowish green, and the flowers are small or without flowers.
The route of infection is caused by the infection of mycoplastids (MLO for short). Mycoplastids mainly survive and survive the winter on various perennials such as daisy, spring white chrysanthemum, Plantago przewalskii, Suaeda salsa, unmanned chrysanthemum, bitter borage and other perennials, and mainly infect these plants through leafhoppers. In addition, dodder can also transmit poison.
Prevention and cure method
1. Eliminate the diseased plants and destroy them in time to reduce the source of infection. Pay attention to the removal of weeds and other wild hosts around the planting area.
2. Although the seeds do not carry pathogens, they should also be collected from disease-free and healthy plants for reproduction, and the cultivation of robust seedlings can improve disease resistance.
3. Control the leafhopper by insecticide, remove the virus-transmitted dodder in time and control the disease. Symptoms of Baxian blight: near the ground leaves, produce water-stained yellow-brown spots, and spread to the stem, causing the leaves to dry up, the stems become black and rot. Brown arachnoid mold can be seen at the base of diseased plants in moist soil.
Pathogen: RhizoctoniasolaniKuhn. Belongs to the fungal semi-knowledge subphylum, no spore order, Rhizoctonia, Rhizoctonia solani. The disease condition is about 15 ℃, the soil is moist, and the new tillers sprouting are tender, weak and easy to infect.
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Prevention and control of diseases and insect pests of eight Immortals
It is vulnerable to aphids when it is high humidity, high humidity and poor ventilation. Prevention and treatment: timely ventilation. When the disease is serious, it can spray 1500 times the liquid of Zhiling. It is not serious and can be brushed off manually. It can also be sprayed with cigarette butts or pepper liquid, and the effect is obvious. Its prevention and control methods refer to the rose.
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A method of dwarfing eight Immortals
Baxian flower, alias hydrangea, powder ball flower, in the subtropics, tropics for evergreen shrubs, like semi-shade humid environment, flowers in full bloom during flowering, its color also varies with the acidity of the soil, the flower is light red when the soil is alkaline, and the flower is blue when the soil is acidic. The normal flowering period of potted Baxian flower is from May to August, if it is not treated and allowed to sprout and grow, its plant height can reach 50-70cm, it is easy to lodge in the pot, and the flower has little effect on the ornamental value. How to make potted eight Immortals
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