Fusarium wilt is one of the most important diseases of chrysanthemum. It occurs in many areas of our country. Although the incidence of the disease is not high, it is extremely harmful. Once the plants become infected, if the control measures are not timely, it will cause the plants to die quickly.
Chrysanthemum wilt is a fungal disease. The pathogen is Fusarium oxysporum, a soil-borne disease. The most suitable temperature for disease onset is 27°C-32°C. At 21°C, the disease tends to ease, and when it is less than 15°C, the disease is no longer affected. In recent years, in particular, some chrysanthemums, which are to be controlled for flowering and shaded, are susceptible to the disease because of the high temperature in the shed and the lack of ventilation.
When the pathogen infects the plant, it initially appears as the chlorosis and yellowing of the lower leaves, which is generally not easy to detect. Then the plant leaves began to wilt droop, brown, and dead, especially the lower leaves began to fall off. Back to this, when the plants are beginning to show symptoms, they must not easily think of water shortages and delay the prevention and treatment. Observe carefully and check whether the stem of the plant is slightly swollen and brown. The epidermis is rough with cracks. When the humidity is high, white mold is visible. Stem transection or longitudinal cut, visible vascular brown or dark brown. The plants can also be depotted, and it can be seen that the roots that have been infected with the bacteria become black and rot.
In the prevention of chrysanthemum wilt disease, the first is to select disease-prone varieties and collect shoots from disease-free plants. The second is to disinfect the soil and sterilize it regularly with a bactericide. The third is to control the soil moisture content, should use well-drained matrix. The fourth is to grasp the plant density in order to facilitate ventilation.
When a plant is infected with a pathogen, it must be applied quickly. The author found that the disease, with 50% carbendazim for treatment, the effect is good, the method is as follows: When the disease occurs in the plant, the preparation of carbendazim 200 times -400 times the solution is milky white, the roots of the plant watering, and Spray the whole plant. Start the first day, the second day in two consecutive days, once in the fourth day, and once in the sixth day. Under normal circumstances, use four or five times to recover. However, some seriously ill plants must be removed and best burned.
In addition, it can also be used 25% Benzol powder 200 times -400 times the liquid, or 50% dexamethasone emulsion 800 times, the same method and carbendazim, the effect is not bad.
Levamisole As Immunomodulator,Levamisole As Chemo,Levamisole Vs Albendazole
Shaanxi YXchuang Biotechnology Co., Ltd , https://www.peptidenootropic.com