Planting Technology Lists
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Rhododendron chlorosis
Rhododendron chlorosis is not only a non-infectious disease, but also a common disease in rhododendron cultivation. After the plant has pathological changes, the leaves become thinner, chlorotic and pale, so the disease is also called chlorosis, and the new leaves lack green obviously. When the leaves of the new shoots become lighter and the mesophyll turns yellow, the veins are still green. At this time, the symptom of iron deficiency is generally diagnosed. This phenomenon often occurs in alkaline soil and areas where alkaline water is used to water flowers. After the disease appeared in the leaves, the photosynthesis could not be carried out normally, and when it was light, it affected the growth and hair of the plant.
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5 water plants.
One is to choose slightly acidic water. Azalea love slightly acidic water, avoid alkaline water. If alkaline water is often used, it will not take long for azaleas to die. The choice of water quality, generally appropriate to use pH 7 below the natural water or drinking tap water. If the water quality does not meet the acidity requirements, 0.1% ferrous sulfate or 0.5% vinegar can be added to the water. The second is to use "trapped water". Usually, two or three days of water can be trapped. "Trapped water" should be dried at the same temperature as azaleas
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Pay attention to changing pots after azaleas.
The pot should be selected according to the plant size, and the mud pot is better. The general pot diameter (inner diameter) should not exceed half of the crown diameter. Cuckoos like acidic soil and require a pH value of 4.25-5.5. If this acidity is not maintained, it is difficult for potted cuckoos to survive, and the potted soil requires loose drainage, rich in humus, and do not use sticky loess. When using soil, it is best to prepare according to the original soil quality of rhododendron. Previously, plants cultivated with pine soil should still choose loose soil, which can be mixed with a small amount of rotten horse dung and bone powder.
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Prevention and control of rhododendron brown spot
1. The primary reddish-brown dot on the diseased leaf gradually expands into a nearly round, or polygonal spot limited by the vein of the leaf, with a diameter of 1mm to 5mm, dark brown; sometimes gray-white in the center, the edge is not obvious. The disease spot leaves are one-sided deep and the back color is light, and the disease spots on the leaf edge can be connected to each other, and most of them produce gray-black mildew spots on the surface of the disease part when it is wet. 2. The pathogen of rhododendron brown spot is CercosporarhododendriFerraris, which belongs to Trichoderma. The gray-black mildew spot on the disease spot is
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Control of Root Rot of Rhododendron
Root rot is a serious threat to rhododendron. Although its incidence is not high, the mortality rate after infection is very high. Therefore, attention must be paid to the prevention and control of root rot in the cultivation and management of rhododendron. Root rot is a soil-borne disease caused by Fusarium oxysporum, which mostly occurs in the roots of rhododendron, because these parts are often moist, lack of sunlight, and Fusarium oxysporum fungi are active frequently. Once it invades the cortex, it will soon cause rot, watery brown spots and soft rot will appear on the roots, and the xylem will be black and brown.
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Rhododendron rot
Symptoms rhododendron flower rot only harms flowers, resulting in shortened florescence, flower sagging, early withering and shedding. After the petals are infected, the diseased part loses its luster, is waterlogged, softens and fades, and finally turns brown, rotten and black, and a gray mildew layer grows on the surface when it is wet, affecting the ornamental. The pathogen and incidence regularity of the disease belongs to semi-known bacteria subfilaria fungi. The bacteria form sclerotia on the rotten flowers, and the sclerotia fall into the soil with the abortive flowers to overwinter. During the flowering period of the following year, conidia are produced, which are dispersed by wind and rain or spread by air, and sprout in flowers.
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Control of Tetranychus Tetranychus in rhododendron holly
Distribution and harm have occurred in Japan, South Korea, the United States and other countries. Harm to azaleas, camellia, tea, etc. Morphological characteristics of female mite: reddish brown, body length about 0.14 mm. Male mite: body length is about 0.33 mm. The damage of this mite to rhododendron is mainly from May to July and from October to December, and it can absorb juice on the front and back of the leaves, and the leaves are yellowish green in severe cases.
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Key points of cultivation techniques of Rhododendron
1. The choice of land preparation should be warm and humid, light is not too strong, cool climate, fertile soil, acid soil rich in humus, neutral soil with pH below 7 or pH=5-6, good drainage and ventilation. two。 Propagation method (1) seed propagation method most rhododendrons can bear fruit and collect seeds, only double petals are not fruiting. Generally speaking, the ripening period of seeds is from October to January every year. When the pericarp changes from green to yellow to brown, the top of the fruit will crack and the seeds will begin to scatter.
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Four suitable taboos of rhododendron
Rhododendron, also known as Yingshanhong, belongs to the genus Rhododendron of the rhododendron family, and is a typical acid indicator plant. Because of its bright color, peculiar flower shape, long flowering period and different varieties, it is often loved by people. However, due to improper management methods, resulting in less yellow flowers, light color, and even death. Therefore, in peacetime management, special attention should be paid to "four appropriate four taboos". First, it should be warm and humid to avoid the scorching sun getting too wet. Cuckoos should grow in a warm and humid environment, should keep the basin soil moist, but can not accumulate water, which can easily cause rotten roots and lead to death. If you pour tap water, you should add an appropriate amount of vinegar or sulfur.
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Cause of death of rhododendron and its control
Rhododendron, there are many common diseases and insect pests. The author has cultivated flowers for many years and can be summed up into eight reasons from practice. 1. Black spot is the main disease of rhododendron. The disease is more serious from June to August, and it is the most serious when the temperature is 25 ℃ ~ 32 ℃. When the temperature is below 10 ℃, the disease can stop spreading. After the onset of the disease, the leaves formed black spots and gradually dried up and fell off. This is the main cause of death of cuckoos. Prevention and treatment: 1. Burn the diseased leaves. 2. Drug prevention and treatment. ① is sprayed with 50% wettable carbendazim 600 × 800 or carbendazim.
2019-01-16