status quo:
Recently, a vegetable grower reported that the long eggplant in the shed had plants wilting and dying. There were no obvious symptoms on the leaves, only wilting, and a gray-brown mold layer was growing on the stems. What is the disease? How should it be prevented?
Cause Analysis:
The above symptoms were originally caused by gray mold disease. When the disease infects the stem, the diseased part produces brown water-soaked lesions. When the humidity is high, there is a gray mold layer on the surface. Sometimes the pathogen will directly infect the base of the stem. In severe cases, lesions often surround the stem for 1 week, causing the stem to rot, become thinner, and necrotic, and eventually cause the entire plant to wilt and die. The pathogen can overwinter in the soil and prefer a high-humidity environment. When the spring and summer conditions are suitable, it can be reinfected multiple times by airflow or agricultural operations, causing spread.
Prevention:
Physical control: remove diseased residues in time to reduce the source of bacteria. In normal management, pick flowers in time, pick out diseased fruits, and bring these infection sources out of the shed in time, which can greatly reduce the source of bacteria, and also prevent pathogens from reinfecting and spreading, reducing the incidence of disease.
Pay attention to air disinfection and cut off the spread of air. The pathogenic spores of Botrytis cinerea have a strong reproductive capacity. Once mature, they will produce a large number of spores, which will be scattered everywhere when encountering the airflow, and fall to the ground, the surface of the column, the surface of the wall, etc., causing new Botrytis cinerea source. Therefore, it is recommended that vegetable growers use air disinfection tablets to prevent and treat Botrytis cinerea safely and effectively without air damage.
Cultivate strong plants to avoid disease infection. The growth of the plant is also an important factor affecting the severity of the disease. Plants tend to be weak, yellow leaves are susceptible to serious plant diseases, and strong plants are less susceptible to disease. Therefore, in the management of sheds, we must pay attention to the maintenance of roots and leaves, adjust the balance between vegetative growth and reproductive growth, and improve the disease resistance of plants.
Medicament control: Isoprofen, boscalid, procymidone, etc. can all prevent gray mold disease. When the onset is serious, the following compounding formulas can be used, such as fluoxastrobin + pyraclostrobin, or fluorine Pyridinamine + profenzinc, clotrimazole + pyrimidine · fludioxonil, etc.
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