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How to treat water quality when watering rhododendrons
When watering rhododendrons, pay special attention to water quality. It is best to use natural rainwater, because natural rainwater does not contain bleach powder and other chemicals and impurities. Next best are river water and pond water, and then tap water. Tap water is softened water that has undergone purification treatment, and it contains chemical agents such as bleach powder, liquid chlorine, and alum. If this kind of water is used for a long time, the alkalinity in the potting soil will gradually increase, which is not good for the growth of rhododendrons. Therefore, the water quality must be treated before use. The treatment method is to acidify it. For water that is neutral or slightly alkaline,
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Detailed Guide to Controlling Leaf Spot Disease in Rhododendrons
Symptoms: It mainly infects the leaves. In the early stage of the disease, small reddish-brown spots appear on the leaves and gradually expand into lesions or irregular polygonal lesions that are dark brown. In the later stage, the tissue in the center of the lesions turns grayish-white. When the disease is severe, the lesions connect with one another, causing the leaves to turn yellow, wither, and drop early. Control methods: 1. In autumn, clear away and dispose of fallen leaves, and during the growing season promptly remove diseased leaves. 2. Planting or potted flower placement density should be appropriate to ensure ventilation and light penetration for the plants and reduce leaf surface humidity. In summer, place potted flowers in an outdoor shade shed to reduce sunscald and mechanical
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Detailed Explanation of Key Points of Rhododendron Tissue Culture Technology
Rhododendron is an evergreen or deciduous small shrub of the genus Rhododendron in the family Ericaceae, characterized by many varieties, early flowering, rich flower colors, and a long flowering period. In recent years, due to the development of cutting propagation technology, China's rhododendron production has increased. However, precious varieties still cannot meet social demand due to few mother plants and a low propagation coefficient. Tissue culture is precisely an effective measure for achieving factory-scale seedling production of rhododendrons. A brief introduction is given below: 1. Basic technical steps of rhododendron tissue culture. In rhododendron tissue culture, the explants usually used are stem tips, stem
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Detailed Guide to Rhododendron Seed Propagation Methods and Steps
Seed propagation is sexual reproduction. Because the seed-setting rate of natural cross-pollination is very low, artificial pollination is generally carried out to increase the seed-setting rate of rhododendrons and obtain more seeds. The main method is: when the rhododendrons are in full bloom, select robust mother plants with good growth and beautiful flower colors, move them to a greenhouse, and on each pot keep 3-4 flowers that are large and bloom early; remove the stamens and the new buds near the flowers so that nutrients are concentrated. When mucus appears on the stigma, dip a new small brush in the pollen of the father plant and apply it several times. One week after pollination, move the pot
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A Detailed Guide to Rhododendron Cultivation Techniques and Pest and Disease Control Methods
Rhododendron, also known as yingshanhong, yangjiaohua, yangzhizhu, hongzhizhu, and hongzhizhu, is a semi-evergreen, evergreen deciduous shrub or evergreen small tree of the genus Rhododendron in the family Ericaceae. Flower types include single, semi-double, and double, with the corolla mostly red, in various shades such as bright red, pink, peach red, vermilion, purple red, and yellow; there are also pure white, golden yellow, pale yellow, and violet colors, or mixed with spots and stripes. There are about 800 species in the same genus, most of which are native to China. It is a traditional famous flower of our country and one of China's "Top Ten Famous Flowers." It is a city
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Identification and Control Methods 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 suffers from 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, and the roots gradually rot and peel, with the xylem turning black. This disease is most likely to occur 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, deal with it promptly.
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How should rhododendrons be fertilized correctly?
Rhododendrons are flowers that do not need heavy fertilization. If too much fertilizer is applied or it is too concentrated, it will instead be harmful to their growth. But this is not to say that no fertilizer should be applied at all. To make them bloom abundantly and produce large flowers, it is still necessary to apply some fertilizer at the right time and in the right amount. Therefore, flower-growing experts have summed up their experience with fertilization in 8 words: "Apply dry fertilizer sparingly, apply liquid fertilizer thinly." This is very appropriate and worth referring to for flower growers. Under normal circumstances, 1-2 year old seedlings do not need fertilization, because the fertility contained in the humus soil is already enough to supply the needs of seedling growth and development. 2
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A comprehensive guide to rhododendron leaf spot disease
Round lesions, or irregular polygonal lesions, dark brown, 1mm-5mm in diameter. In the later stage, the central tissue of the lesions turns grayish white. When the disease is severe, the lesions merge with each other, causing the leaves to turn yellow and drop early. Under moist environmental conditions, many small brown mold spots grow on the underside of the leaf spots, namely the conidia and conidiophores of the pathogenic fungus. Pathogen and current disease situation: it is Cercospora rhododendri Fer., Deuteromycotina, Hyphomycetes
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Do you know about the new rhododendron variety 'Jin Zhizhu'?
Variety origin: The new rhododendron variety 'Jin Zhizhu' was selected and bred from seedlings of Rhododendron molle (Chinese azalea). In June 2001, it was registered as a new horticultural plant variety with the Forestry Department of Yunnan Province. Variety characteristics: deciduous shrub, 60--80 cm tall, with fibrous roots. Leaves papery, oblong, 5--11 cm long, 2--4 cm wide. Terminal umbel, with 7--13 flowers, corolla tubular-campanulate, 3--3.5 cm long, 4--5 cm wide, the outside of the flower golden yellow
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What kind of potting soil is suitable for rhododendrons?
The choice of soil is crucial to the growth and development of rhododendrons. There are many ways to mix potting soil for cultivating rhododendrons, varying with the cultivar, but it must meet the following conditions: loose, well-drained, well-aerated, acidic soil, rich in humus, and with sufficient base fertilizer. Rhododendrons usually grow vigorously only in acidic loam; if in alkaline soil, the leaves soon turn yellow and the plant withers and dies. Rhododendrons are regarded as an indicator plant of acidic soil. Leaf mold soil is generally acidic, and pine needle humus soil is the best, making it the ideal potting soil for growing rhodo
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