Purple disease is one of the major diseases in eggplant production in recent years. At present, the cause of the disease is bacteria or virus, and it is not clear. Rapid onset of rapid development, resulting in a substantial reduction in eggplant, reducing the value of eggplant products. Many vegetable farmers have had little success in making good medicines. They have no choice but to plant other vegetables.
First, the symptoms
Purple disease can harm fruits, leaves, and flowers at the same time. On the early stage of the disease, purple spots appear on the petals of the eggplant, and as the disease progresses to the petal malformation, the eggplants in the latter stage are hard and slightly uneven and have stagnant fruit. The skin is dark in color, brownish and rot inside the fruit, or brown necrotic spots in the pulp near the pericarp. Copper-sized ring-shaped brown lesions appear on the leaves, causing serious damage. Purple disease can harm fruits, leaves, and flowers at the same time. Second, the cause of the disease
Due to the poor development of soil roots in dry conditions or low ground temperature in winter, the thermophilic microbial activity in the soil is inhibited and the cold-resistant microorganisms continue to move. Therefore, the absorption of nutrients such as calcium, magnesium, boron, and potassium is inhibited, resulting in unbalanced nutrient absorption. As a result, the internal environment of the crop is disordered. With the continuous rise of temperature in spring, the growth of plants is increased, the nutrition is seriously degraded, and the disease resistance and stress resistance of the crops are reduced, which easily causes bacterial diseases. Because the disease's mode of transmission and its onset symptoms are very similar to those of viral diseases, many people think that it is caused by a virus. This disease is called Violet Virus Disease.
Third, the incidence of the law
Eggplant purple disease begins to develop at 20-30°C. It becomes more severe as the temperature rises, especially when field management is extensive and high-temperature droughts are severe. They are spread by airflow, insects, and contact.
Third, control methods
1. Increase the use of organic fertilizers to improve the soil and spray foliar fertilizers containing iron, zinc, calcium, magnesium, and boron in a timely manner. Strengthen water and fertilizer management, maintain nutritional balance and soil moisture balance, promote root development, enhance plant growth, and reduce the incidence of disease.
2. In the summer, high-temperature stuffy sheds can be used to kill bacteria and soil pests in the soil. Appropriate control of aphids, whiteflies and other pests.
3, the initial stage of disease, can be sprayed with 20% leaf wettable powder 600 times liquid, plus 20% morpholine hydrazine. Bronze 800 times, add 700 times the amount of calcium sugar alcohol. Or spray 800 times the doctor of copper, plus 1200 times kasugamycin, 3% sodium dichloroisocyanurate 600 times. Alternatively, foliar proteoglycans, aminooligosaccharides, linnanmycin, morpholinium hydrochloride, and other agents can be used in combination with chitin or alizarin and other conditioners for foliar sprays.
4. Strictly control the quality of scion, disinfect and sterilize, and prevent viruses. Graft healing degree is higher, if the scion and rootstock healing degree is poor, it will lead to poor nutrition supply, plant resistance is easy to infect the disease.
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