Control measures of anthracnose and yellowing in Magnolia
Anthrax
Symptoms: dark brown round or nearly round disease 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.
Chlorosis
Symptoms: at first, the young leaves on the tender leaf tips lost chlorosis, and then expanded from the leaf edge to the leaf base from the top to the bottom. After the chlorosis of the leaf margin, it gradually extends to the mesophyll tissue, making the intervein tissue turn green, and the veins continue to develop so that the leaf becomes milky yellow to milky white. In serious cases, the leaf margin is scorched, and even the whole leaf is dry and shedding. If the disease of 1-year-old seedlings is lower than that of normal plants, the height of 3-4-year-old seedlings is yellowed, which is about 30 cm shorter than that of normal healthy plants. Chlorosis leads to slow plant growth, shortening of internodes and shoot withering.
Iron deficiency symptoms should be supplemented with ferrous sulfate, specific methods: 1. The mung bean-sized ferrous sulfate was embedded under the basal cortex of the seedling, and then bandaged with plastic film to facilitate wound healing. two。 Apply ferrous sulfate into the trench, add rotten cake fertilizer and cover it with soil. 3. Choose to spray 0.5% ferrous sulfate solution or 500 times of yellow leaf fast green plant antiviral compound nutrient solution to the leaves before sunrise in the morning or after 4 o'clock in the afternoon, spray it again every 7-10 days or so, and spray it 2-3 times continuously.
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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. The disease of the symptomatic 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. The cause of yellowing of Magnolia is not
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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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