Planting Technology Lists
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What are the common diseases of rhododendron? How to prevent and cure?
The main diseases of rhododendron are root rot, brown spot, black spot, leaf blight, iron deficiency chlorosis and so on. After the rhododendron suffered from root arm disease, the growth was weak, the leaves wilted and withered, the surface of the root system appeared water-stained brown fields, serious soft rot, gradually rotted and peeled, and the xylem blackened. The disease is most likely to occur in an environment with high temperature and high humidity. The prevention and control method is to strictly disinfect Pei 10 soil before turning the basin, and keep the soil condition sulfur loose, moist, make it have good permeability, and avoid stagnant water. If the plant is found to be sick, it should be dealt with in time.
2019-01-16 -
Rhododendron gall disease
Symptoms: it can harm the twigs, shoots and leaves of rhododendron. After the injury of the leaf, the margin or the whole leaf was swollen and hypertrophic, showing tumor-like or hemispherical fleshy gall. After the twig was damaged, it also swelled and thickened into fleshy galls, affecting the shoot. After the flower is damaged, the white powdery mildew layer appears on the petal surface or depression, that is, the seed layer of the pathogen. In the later stage, the galls turned brown and withered and fell off. Pathogens and disease status: pathogens: hemispherical epidiomycetes Exobasidiumhemisphaer-icumShirai, basidiomycetes subphylum, stromatomycetes, exophytes
2019-01-16 -
How should azaleas be fertilized?
Rhododendron is a kind of flower that does not need big fertilizer. If the fertilizer is applied too much or too thick, it will be harmful to its growth. But this does not mean that it should not be fertilized, but that it should bloom more and more, and that the sky should apply some fertilizer at the right time and in the right amount. Therefore, flower growers summed up eight words of experience in fertilization: "less dry fertilizer, less liquid fertilizer". This is very appropriate and worthy of reference by florists. In general, 1. 2-year-old seedlings do not need to apply fertilizer, because the fertility contained in humus soil is enough to meet the needs of seedling growth and development. two
2019-01-16 -
Control techniques of Leaf Blight of Rhododendron
First, the main symptoms: occur in the leaves, mostly in the tip of the leaves. In the initial stage, the disease spot is faded green macula, the disease spot spreads inward from the edge, showing an irregular shape; in the later stage, the disease spot is yellowish brown, and when the disease leaf is serious, the disease leaf is dry. Second, the cause of the disease: fungal diseases. The pathogen lives on the plant disease residue and spreads through watering, insects and human activities. It can occur all the year round in the indoor environment. High temperature, dryness and poor ventilation are easy to cause diseases. Plant growth is weak or affected by insect pests (especially aphids, shell insects, whitefly)
2019-01-16 -
Disease knowledge of Leaf spot of Rhododendron
Round spot, or irregular polygonal spot, dark brown, 1mm-5mm in diameter. In the later stage, the central tissue of the lesion turned gray. When the disease is serious, the disease spots are connected to each other, resulting in withered and yellow leaves and early fall. Under the moist environment, there are many brown mildew spots under the leaf spot, that is, the conidia and conidiophores of the pathogenic bacteria. Pathogen and disease status: Cercospora rhododendron CercosporarhocdodendriFer., half-known subphylum and filament
2019-01-16 -
Rhododendron culture
Azaleas are very beautiful, and everyone is willing to raise them, but how can they raise them well? There are many fastidious here, azaleas like acidic soil and water, afraid of alkaline soil and water, afraid of waterlogging: like warm and cool, afraid of dry and hot environment, afraid of dry air; like semi-overcast, afraid of scorching sun; like thin fertilizer, afraid of thick fertilizer. What kind of soil larch humus soil acidity is suitable, soil quality is loose, fertile, good permeability, suitable for rhododendron growth. What kind of water should be used for cuckoos? the PH value is less than 7. In areas where the water quality tends to be alkaline, in addition to storing Rain Water and snow water, acidified water can be added to 100 jin of water.
2019-01-16 -
A New Rhododendron Variety 'Rhododendron'
Variety source: rhododendron, a new variety of rhododendron, is selected from the sown seedlings of rhododendron. The registration of new horticultural plant varieties was carried out in June 2001 by the Forestry Department of Yunnan Province. Variety characteristics: deciduous shrub, high 60--80cm, fibrous root. Leaves papery, oblong, long 5--11cm, wide 2--4cm. Terminal umbel, with 13 flowers, Corolla tubular-campanulate, long 3--3.5cm, wide 4--5cm, golden outside
2019-01-16 -
Soilless cultivation techniques of Rhododendron
Soilless cultivation is characterized by replacing soil with man-made substrates. The soilless cultivation of summer cuckoo has compact crown structure, more flowers, large flower diameter and less diseases and insect pests. It not only improves the quality of flowers, but also greatly reduces the heavy physical work, so it is a cultivation method worth popularizing. 1. The preparation of matrix. The root system of rhododendron is very slender, which requires loose matrix to facilitate air permeability and drainage. 1 part of vermiculite, 1 part of pearl sand, 1 part of river sand and 1 part of cinder were mixed in proportion. Mixed matrix, using more than 0.1%
2019-01-16 -
Management of soilless propagation of rhododendron
The propagation method of rhododendron can be propagated by cutting, grafting, striping and sowing, while cutting and grafting are widely used, and the excellent characteristics of crystal seeds can be maintained. The sowing method is mainly used for cross breeding to select excellent individual plants. Most of the cuttings are semi-lignified branches, which can be carried out from May to August. Often use river sand, perlite and peat as the matrix. After planting the flowerpot, cover it with a plastic bag and put it in a half-shaded place. Spray water once a day in the morning and evening within a week, and keep the pot soil moist after that. At the temperature of 20-25 ℃, the general variety is about 4.
2019-01-16 -
What kind of soil is rhododendron suitable for?
The choice of soil is very important for the growth and development of rhododendron. There are many methods for the cultivation of rhododendron, which vary from variety to variety, but they must have the following conditions: loose, unobstructed drainage, good ventilation, acidic soil, rich humus and sufficient base fertilizer. Usually azaleas thrive when living in acidic loam. If they are in alkaline soil, they soon die of leaf yellow exhaustion. Rhododendron is regarded as an indicator of acidic soil. Generally speaking, rotten leaf soil belongs to acid soil, and pine leaf humus soil is the best, which is planted du.
2019-01-16