Peony yellow leaf disease diagnosis and treatment
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Yellow leaves due to excessive fertilization. Peony generally uses manure, bean cake, oil residue and other organic fertilizers as topdressing fertilizer or base fertilizer. Excessive fertilization will lead to water shortage in the soil, resulting in fertilizer damage. The main performance is that the new leaves are hypertrophic and glossy, but the foliar bumps do not stretch and the old leaves gradually turn yellow and fall off. In this case, appropriate watering should be used to dilute the nutrients.
The droughty yellow peony is a fleshy root system, and it should generally be less watered, but the drought will lead to the lack of water yellowing peony leaves, especially the seedlings performance is more obvious. Symptoms are normal at the top of the heart and the new leaves. The first leaf of the lower leaf and the inner iliac leaf is first exfoliated and yellow. At this time, it should be poured once in the morning or evening.
If Alkali yellow peony grows in alkaline soil, the leaves will lose green and yellow. The symptoms began in the new veins, and the veins, especially the main veins, remained green, and the yellow-green phase was quite obvious. With the increase of the degree of yellowing, the veins gradually lose their green color, and then the whole leaves turn white. The leaf margins are scorched and the leaves fall off. In severe cases, the tip of branches shoots dry, causing the entire plant to die. For this "yellowing" phenomenon, 0.2% to 0.3% of ferrous sulfate solution can be used to spray the leaves 3 to 5 times, the concentration should not be too large, and should be used with the distribution.
Hunger yellow lacks yellow leaves caused by certain elements. Symptoms usually show yellowing on a large area of ​​a certain area.
When the peony is deficient in phosphorus, the plants grow slowly and are dwarf and thin, and the leaves are easy to fall off. The color is generally dark green or grayish green and lacks luster. Start with the old leaves of the base of the stem and gradually expand toward the upper part.
In the absence of potassium, the old leaves and leaf margins are usually yellowed and browned. The burns are like burns. Brown spots or patches appear on the leaves, but the leaves remain green in the middle, veins and near the leaf veins. With the intensification of the degree of potassium deficiency, the entire leaf becomes reddish-brown or dry-like, with necrosis and shedding. The root system is short and less prone to premature senescence and severely decays.
Traces of magnesium, manganese, boron, copper and other trace elements will also appear yellowing, necrosis, withered tips and other symptoms, should be sprayed after spraying flowering potassium dihydrogen phosphate and trace fertilizer to supplement nutrition. Peony lesions, leaves can also appear shades of uneven, yellow and green mottled, that is, "flower mosaic." This is the most common symptom of viral disease and needs to be distinguished.
The worms and peony are mostly harmed by earthworms and nematodes such as earthworms and earthworms. The leaves are chlorogenic and yellowish, and even the leaves are dead. The main feature of this symptom is the yellowing and scorching of the leaves of a single plant or several plants. When this symptom is discovered, it should be promptly viewed and applied to prevent and control underground pests.
The rotten yellow peony cultivation site has many years of cultivating and cultivating land, among which there are many pathogens, especially the fungus Fusarium spp., which causes rot and rot of the peony root and stem base. As a result, water absorption and fertilizer absorption capacity weaken, causing the lower leaves to gradually turn yellow and fall off. Or coke, but the color of the top of the peony and the new leaf is still normal. This is the yellow leaf symptom that the root rot of Peony shows when it is dry.
After the summer rain, rot is different from this performance. After the rain, the symptoms of rot show yellowish young leaves and yellowish old leaves. At this point should be combined with the application of anti-microbial bactericidal treatment of root rot or irrigated root, or in conjunction with the autumn seedlings dip root, and dredge medicine.
In the process of daily cultivation and management of peony, once the yellowing and scorching of the leaves are found, it is necessary to carefully observe, determine the cause, and promptly give reasonable treatment.