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What are the control methods for azalea leaf spot disease?
Leaf spot is a major disease of azaleas. When it first appears, small brown spots form on the leaves; the spots merge with one another and gradually develop into large blotches, and the lesions become irregular in shape, darker on the upper surface and lighter on the underside. In the later stage, the center of the lesion turns grayish brown, and many black or grayish-brown spots form on the lesion. In severe cases, the branches are completely bare and the plant becomes weak. Control plan: at the early stage of the disease, spray 1:1:120 Bordeaux mixture, or 0.4 degree Baume lime sulfur mixture, or 65% zineb wettable powder at 500 times dilution, or 25% car
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How to Propagate Azaleas: A Detailed Guide to Common Methods
Techniques for propagating azaleas: mainly by cuttings. Selection of cuttings: take current-year semi-lignified branches, snap them off with a heel, remove the lower leaves, and keep 4 to 5 leaves at the top. Cutting time: Western azaleas from late May to early June, hairy azaleas from early to mid-June. Cutting method: home growers mostly use pot cuttings, with river sand or perlite as the medium. When working, insert the cutting one-third or one-half deep, then spray with a fine-nozzle pot and place under a shade shed. Management: within 1 month after inserting, focus on shading and spraying water. Keep the cuttings
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Detailed Explanation of Azalea Layering Propagation Methods and Techniques
Azalea layering is also one of the commonly used propagation methods, generally using air layering. Azalea layering is often carried out between April and May. The specific procedure is: first, on the mother plant of a potted azalea, select a robust 2-3 year old branch, and 10-12 cm from the tip of the branch use a sharp knife to cut a ring of bark about 1 cm wide around the branch, gently strip the phloem sieve tubes clean, cutting off the channel through which the leaves send organic matter downward, so that it accumulates, accelerating cell division to form a nodular protrusion and sprout root buds. Then use a rectangular piece of plastic film
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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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What are the common pests of azaleas? Detailed explanation of control methods
The common pests of azaleas include: red spider mites, lace bugs, aphids, short-bearded mites, etc. Red spider mites are tiny in size but cause severe damage to azaleas. This type of pest is most likely to appear when azaleas are grown in high-rise buildings. The control method is manual capture and killing. For chemical pest control, a 5-degree lime-sulfur mixture can be sprayed, or equal parts of walnut leaves, oleander leaves and sweet wormwood can be crushed and soaked to extract the liquid, diluted with water and then sprayed. Spraying with a 1000-fold water dilution of dichlorvos is also a good method. The adult lace bug is small and flat, about 4 mm long, black, and is harmful to evergreen
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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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Symptoms and Control Methods of Azalea Gall Disease
Symptoms: It can harm the young branches, shoot tips and leaves of azaleas. After the leaves are affected, the edges or the entire leaf become swollen and thickened, forming tumor-like or hemispherical fleshy galls. After young branches are affected, they also swell and thicken into fleshy galls, affecting new shoot growth. After flowers are affected, a white powdery mold layer, namely the fungal hymenium, grows on the petal surface or in depressions. In the later stage, the galls turn brown, wither and fall off. Pathogen and current disease situation: Pathogen: Exobasidium hemisphaericum Shirai, Basidiomycota, Hymenomycetes, Exobasidiales.
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How to grow azaleas? A detailed guide to cultivation methods
Azaleas are beautiful, and everyone is willing to grow them, but how do you grow them well? There is a lot of know-how here. Azaleas like acidic soil and water, and are afraid of alkaline soil and water, and afraid of waterlogging: they like cool temperatures and are afraid of dry heat, they like a humid environment and are afraid of dry air; they like partial shade and are afraid of blazing sun; they like light fertilizer and are afraid of concentrated fertilizer. What soil to use: larch humus soil has suitable acidity, is loose in texture, fertile, and has good water permeability, making it suitable for azalea growth. What water to use: water for azaleas should preferably have a pH value below 7. In areas where the water tends to be alkaline, besides storing rainwater and snow water, acidified water can be used, that is, add to one hundred jin of water
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Soilless Cultivation Methods and Key Technical Points for Azaleas
The characteristic of soilless cultivation is the replacement of soil with an artificially made substrate. Summer azaleas grown soilless have a compact crown structure and abundant flowering; large flower diameter and few pests and diseases. It not only improves flower quality but also greatly reduces heavy physical labor, making it 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, 1 part perlite, 1 part river sand, and 1 part coal cinder mixed in proportion. After mixing the substrate, use 0.1% car
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