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 appearance of diseased leaves, photosynthesis can not be carried out normally, which will affect the growth and development and ornamental value of the plant in light cases, and lead to plant death in severe cases.
Prevention and control measures: to strengthen cultivation management, combined with irrigation, ferrous sulfate solution can be irrigated, and 0.5% ferrous sulfate solution can be sprayed on the leaf surface, which can gradually restore the green leaf surface of the plant.
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Effective prevention and control of rhododendron chlorosis
Rhododendron chlorosis is a physiological disease, but the reasons for the formation of chlorosis are complex, such as prevention and treatment, often futile, so we must carefully observe, determine the condition, find out the cause, and then prescribe the right medicine to be effective. The various symptoms, causes and effective prevention and treatment measures of rhododendron chlorosis are described as follows: first, iron deficiency. 1. Soil iron deficiency: the formation of chlorophyll requires elements such as iron and nitrogen, and the phenomenon of chlorosis caused by soil iron deficiency often occurs, so it is very important to supplement iron in the soil. Sulfuric acid can be used.
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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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