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Control Methods for the Azalea Spider Mite
Distribution and damage: it has occurred in Japan, South Korea, the United States and other countries. It damages azaleas, camellias, tea plants and others. Morphological features: female mite: reddish-brown, body length about 0.14 mm. Male mite: body length about 0.33 mm. This mite damages azaleas mostly from May to July and from October to December, when the damage is severe; it can suck sap on both the upper and lower surfaces of leaves, and in severe cases the leaves lose their green color and turn yellow-green.
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How to grow azaleas hydroponically? Hydroponic methods and care tips
Soilless cultivation is characterized by replacing soil with an artificially made substrate. The Hunan Provincial Forestry Research Institute used a solid substrate for soilless cultivation of azaleas and achieved very satisfactory results. The variety was the summer azalea (Rhododendron); under soilless cultivation the crown structure was compact, the flowering amount was abundant; the flower diameter was large, and there were few pests and diseases. It not only improved flower quality, but also greatly reduced heavy physical labor, and is a cultivation method worth vigorously promoting. 1. Preparation of the substrate: Azalea roots are very fine, requiring a loose substrate to facilitate aeration and drainage. Use 1 part vermiculite,
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Detailed Explanation of Rhododendron Cutting Propagation Methods and Techniques
Plant propagation methods have always been divided into two major categories: sexual and asexual. At present, most large-scale rhododendron production uses the cutting method, which belongs to vegetative propagation. This is one of the methods that ensures the offspring are completely identical to the parent, and is a commercial route for mass-propagating identical so-called clones. 1. Propagation subjects: Roughly speaking, the species with the largest leaves require bottom heat during cutting, and the air humidity must be high. From the end of June, closed cutting beds are used, and the branches must be fully mature; only about two-year-old branches are suitable. For the short, creeping alpine rhododendrons from high mountains, cuttings are taken in autumn during propagation, and no bottom heat is needed during insertion; rooting occurs only under conditions of appropriate ventilation.
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Pruning Methods and Trimming Techniques for Azaleas
The best time to prune azaleas is after the flowers fade. The reason is that azaleas bloom first and grow leaves afterward; they already consume a large amount of nutrients when flowering, and after the flowers fade they send out new branches and grow new leaves, which consumes even more nutrients. At this time, insufficient nutrient supply often results in few new branches and weakened growth. Pruning after flowering greatly reduces the plant's nutrient consumption, giving it a period of rest to store up nutrients so it can grow vigorously later. In addition, all plants show apical dominance; when the branch tip is cut off, it loses apical dominance,
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Occurrence and Control Methods of Brown Spot Disease in Rhododendrons
Brown spot disease is a common leaf spot disease of rhododendrons. It occurs fairly commonly throughout the country, and is especially severe in Guangzhou, Suzhou, Nanjing, Lianyungang, Wuhan, Hefei, Shenyang and other places. Besides harming rhododendrons, this disease also harms other plants of the genus Rhododendron. Symptom characteristics: Brown spot disease mainly occurs on the leaves. Initially, small reddish-brown spots appear on the leaf surface. They then gradually expand into nearly circular lesions, or polygonal lesions due to restriction by the leaf veins. The lesions are 2-5 mm in diameter and dark brown; in the later stage, the center of the lesion turns yellowish-white to grayish-white, with a dark brown edge (varying by variety).
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Identification and Control Methods for the Rhododendron Lace Bug
Also known as the pear lace bug and pear flower lace bug, it belongs to the order Hemiptera, family Tingidae. It is distributed throughout the country. The nymphs and adults damage potted ornamental plants such as rhododendrons, Chinese roses, camellias, banana shrubs, jasmine, wintersweet and Chinese wisteria. Damage symptoms: both adults and nymphs gather on the undersides of leaves to pierce and suck the sap, and the undersides of the damaged leaves show a black sticky substance that looks very much like splattered dirt. This feature makes it easy to distinguish from other sap-sucking pests. The entire underside of the damaged leaf turns rusty yellow, while the upper surface develops many pale spots; when the damage is severe, the spots merge into patches, so that the whole leaf loses its green color and looks pale from a distance.
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Comprehensive Prevention and Control Methods and Techniques for Common Rhododendron Diseases
The main diseases of rhododendrons include root rot, brown spot, black spot, leaf blight, and iron deficiency chlorosis. After a rhododendron contracts root rot, its growth weakens, the leaves wilt and dry up, and water-soaked brown patches appear on the root surface; in severe cases soft rot develops, with gradual decay and peeling of the bark, and the xylem turns black. This disease occurs most easily under conditions of high temperature and high humidity. The control method is to strictly disinfect the potting soil before repotting, and to keep the soil loose and moist with good permeability, avoiding waterlogging. If an affected plant is found, promptly deal with the diseased plant and the potting soil. For treatment
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Cultivation Techniques and Management Methods for Belgian Azaleas
Belgian azalea, also known as Western azalea. It produces abundant flowers, has a long flowering period and grows quickly, and is a valuable ornamental flower introduced into China from the Netherlands and Belgium in recent years. It belongs to the Ericaceae family and is an evergreen small shrub. I. Flower habits: Belgian azalea is an acid-loving flower with well-developed, fine fibrous roots. When planting, loose soil with good permeability should be chosen, with humus soil from under forest trees being the best. During growth it prefers conditions of high temperature and high humidity. II. Cutting propagation: Belgian azalea has a long growth period and can be propagated by cuttings throughout the year, generally
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Cultivation Techniques and Management Methods for the Honey Locust
Tree species name: Honey Locust; Latin name: Gleditsia triacanthos L.; English name: Honeylocust; Family name: Fabaceae; Latin family name: Leguminosae; Chinese alias: Three-thorned Honey Locust; Ecological habits: A large deciduous tree in the subfamily Caesalpinioideae of the family Fabaceae. Bipinnately compound leaves with 18-28 leaflets. Fast-growing, with superior timber quality, a well-developed root system and strong adaptability; it tolerates both wet conditions and barren soil
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What are the control methods for the black locust seed chalcid?
Methods for controlling the black locust seed chalcid: 1. Strict seed quarantine; it is strictly forbidden to transport seeds carrying the pest elsewhere. 2. Strengthen the management of mother trees; when pests are found, control them with chemical agents. During the adult emergence period, fumigate with 741 dichlorvos tube-inserted smoke agent. Spray with 80% dichlorvos emulsifiable concentrate at 800 to 1000 times dilution, 40% dimethoate emulsifiable concentrate at 1000 to 1500 times dilution, or 20% fenvalerate emulsifiable concentrate at 1500 times dilution. 3. Soaking seeds in hot water (60°C) for 15 minutes can kill the larvae inside the seeds, or use 10% to 20% salt water to select seeds.
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