Yellowing disease of Magnolia
Chlorosis, also known as chlorosis, is a common disease of Magnolia, especially in areas with alkaline soil. The disease is more serious in this area of our country.
Symptom
The disease of the diseased plant begins with the young leaves at the top of the tip. The mesophyll tissue of the diseased leaf turns yellow or light yellow, while the leaf vein remains green. With the development of the disease, the whole leaf becomes yellow to yellowish white, and the leaf margin becomes grayish brown or brown and necrotic. The disease became more and more serious, the growth of the plant weakened and eventually died.
Cause of disease
Yellowing of Magnolia is a non-infectious disease, that is, physiological disease. The main cause of the disease is that the soil is heavy, moist and alkaline, which makes iron insoluble, which leads to iron deficiency in the plant.
Prevention and cure method
1. Magnolia should be planted in sunny, well-drained, fertile and loose acidic soil. Acid soil such as mountain mud should be used in potted soil, and the new soil should be replaced once in 1 ~ 2 years.
2. At the initial stage of the disease, the rhizosphere soil can be irrigated with 30: 50 times of ferrous sulfate (black alum), or mixed retting with "alum fertilizer water" (2.5 kg of ferrous sulfate, 5 kg of bean cake and 15 kg of pig manure). After 10-15 days of fermentation and ripening, the experience of Henan Yanling flower farmers) and clear water were watered at intervals. The foliar surface can also be sprayed with 0.1-0.2% ferrous sulfate solution.
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Magnolia mandshurica
Magnolia is a smooth-skinned papaya. The fruit is long oval, with a few edges. The pericarp is yellowish green during the growing period, yellow after ripening, thick, smooth, waxy and with more fruit powder. The flesh is yellow and white, with more juice, high juice yield and strong fragrance. The weight of single fruit is 500g to 1000g, and the maximum is 2100g. The fruit ripens from late September to early October and can be stored until February to March of the following year. The tree has moderate potential, semi-open posture, high germination rate, strong branching ability, long life of latent buds and axillary flower buds.
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Control measures of anthracnose and yellowing in Magnolia
Symptoms of anthrax: dark brown round or nearly round spots are produced on the leaves, and the edges are slightly deep. after expansion, the center gradually becomes grayish white, with a size of 2-8 cm. In the later stage, there are small black spots on the disease spots, that is, the conidium disk of the pathogen. When the humidity is high, the disease spot is overflowing with yellow slime, that is, the conidia of the bacteria. The disease is serious in rainy and wet weather. Prevention and treatment methods: at the initial stage of the disease, Bordeaux solution sprayed with 100 times of Bordeaux or 25% of Juling 500 times or 70% anthrax 600 times of anthrax to the United States. Etiolation
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