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What are the reasons that azaleas drop their leaves and die after being watered with organic fertilizer?
After azaleas are watered with a liquid organic fertilizer that has been composted, abnormal leaf drop and death may occur for the following reasons: First, the eggshells and soybean residue may contain a small amount of table salt (sodium chloride), and the fine fibrous roots of azaleas are relatively sensitive to sodium ions, causing root rot, leaf drop, and death. Second, the 5% concentration may still be too strong for the fine hairy fibrous roots of azaleas, or the fertilizer liquid left at the end may have an even higher concentration, making it hard for the plant to withstand. Third, the timing of fertilization may be inappropriate, such as after the flowers fade, when new root tips have just emerged,
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Rhododendron species introduction: What kind of plant is the Chinese azalea (Rhododendron molle)
It belongs to the subgenus Rhododendron subg. Pentanthera. Deciduous shrub, 0.5-2 m tall. Branchlets slender and sparse. Covered with soft hairs and bristles. Leaves papery, tender green, long elliptic-lanceolate, 5-12 cm long, 2-4.5 cm wide, apex obtuse, with a protruding tip, base cuneate, margins ciliate, petiole, leaf surface and leaf underside all covered with soft hairs. Terminal racemose umbel, with 5-9 flowers, blooming in early May, about 10 days later than the red azalea (Rhododendron simsii), flowering before leaves or flowers and leaves appearing together, corolla broadly campanulate, 5-6 cm in diameter, golden yellow to orange-yellow
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Fully Enclosed Cutting Propagation Technique for Azaleas
1. Selecting and building the cutting bed: Choose a sheltered, shady, well-drained site to build the cutting bed. Cover it with a black shade net (60% to 70% shading rate); the sides of the shade net must hang down to the ground so that the entire structure is in a cool, shady environment. On the seedbed, set up a small arch tunnel with a center height of 40 cm. Cover it with a layer of plastic film, then a layer of black shade net (60% to 70% shading rate). 2. Laying the substrate: In early May, mix leaf mold and perlite (1:1) evenly and spread it in the seedbed to a depth of no less than 30 cm. Level it
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How to grow azaleas? Master these cultivation key points
Azaleas are one of China's ten traditional famous flowers, with rich flower forms, brilliant colors, and graceful flower postures. However, azaleas have high requirements for the growing environment. If managed improperly, growth and flowering are often unsatisfactory, and they may even wither and die. Therefore, when cultivating azaleas, pay attention to the following six key points. 1. Soil. Azaleas prefer loose, well-aerated, well-drained acidic soil with a pH between 5 and 6.5, rich in humus. Mountain soil is most suitable, and leaf mold, pine needle soil, peat soil, or decomposed sawdust can also be used. Avoid alkaline soil or
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Analysis of the Causes of Azalea Death or Bud Drop and Countermeasures
The azalea has a graceful tree form and brilliant flowers, and is one of China's ten traditional famous flowers; it is a commonly used flower for landscaping, indoor pot culture, and bonsai making. There are many causes of azalea bud drop or death, mainly: Soil. Azaleas are suited to growing in acidic sandy loam rich in humus, with strong permeability and a pH value of 5.0 to 6.5, and dislike alkaline soil and clay soil. If the planting site is alkaline or highly clayey with poor aeration, it easily causes poor plant growth, bud drop, and even death. Fertilization. Fertilization concentration
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What causes azalea death
Azalea death is generally caused by the following reasons. Alkaline and clayey soil: Azaleas are fibrous-rooted plants and require soil with a pH of 5.5 to 6.5, preferably a growing medium with strong water permeability and rich in humus. After the growing medium is mixed, it should be used only after insecticidal sterilization or high-temperature disinfection. Clay soil has poor permeability, and alkaline soil can cause small flowers, withered stems, leaves and branch tips, and even death. Poor ventilation: Azaleas prefer cool temperatures and fresh air. Poor ventilation easily creates a high-temperature, hot and dry environment, and makes them prone to brown spot disease,
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Identification and Control Methods for the Azalea Lace Bug
The azalea lace bug, also called the azalea lace bug (Stephanitis pyrioides), and "little stink bug." Adults are about 3.5 mm long, dark brown, with wings covered in a network of veins; the forewings are slightly rectangular, and at rest the dark brown markings on the wings form an "X" shape. Nymphs resemble the adults but are tender and small, wingless, and about 2 mm long. Eggs are 0.6 mm long, oval, milky white, laid along the midrib and larger leaf veins, pale green when first laid and later turning pale yellow. There are 3 to 4 generations per year. Adults overwinter from mid to late October in bark and soil crevices and other such places, and the following year
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What causes azalea leaf drop?
There are roughly ten reasons why azaleas drop their leaves due to disease: ▲Excess fertilizer burns the roots, the leaf tips dry out and the leaves fall. ▲Too much water waterlogs the roots and the leaves drop. ▲Watering with water that is too cold or too hot. ▲The soil is too alkaline and compacted. ▲High humidity leads to black spot disease. ▲Red spider mite damage. ▲Tumors grow along the leaf edges. ▲Being moved outdoors too early or too late, or improper ventilation. ▲Excessively dry conditions. ▲Damage from paint or other toxic gases.
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How to control pests on the underside of azalea leaves?
(1) Red spider mite. The individual is extremely small, with a body length generally around 0.3 mm, difficult to see with the naked eye, and observation requires the aid of a magnifying glass. The body is red, and it often gathers on the underside of leaves, mainly sucking the plant's sap and causing grayish-white spots on the leaves. In severe cases, it causes the leaves to turn yellow and drop, new shoots grow poorly, and the tree vigor weakens. Red spider mites produce 10 generations a year, and the damage is especially severe during high temperature and drought from June to August, but the damage is lighter during heavy rain and rainy weather. In winter, dead branches and fallen leaves should be cleared away to eliminate overwintering adults
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Symptom Identification and Control Methods for Azalea Leaf Gall
Symptoms: Azalea leaf gall, also known as cookie disease. The young tissues of azaleas can all be affected, mainly damaging flower buds, young leaves and new shoots. On the upper surface of the leaves, initially pale yellow semi-transparent round spots appear, later turning yellow and sunken; the underside of the leaves is pale red, thickened and swollen, subsequently raised into galls, with a thick grayish-white powdery layer on the gall surface, like a cookie, and the leaves wither, yellow and fall early. In severe cases, the petiole lesions merge into patches, deformed and thickened. When young shoots are affected, fleshy lotus-like leaves or tumor-like leaves are produced at the tips, later shrinking into sac-like forms. After the petals are infected, they become abnormally thickened, forming irregular galls.
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