1, injury disease Luffa brown spot disease mainly hurts the leaves of Luffa. In the early stage of the disease, oval-shaped spots appear on the leaves, the boundaries of the spots are not very obvious, and the color tone is mainly dark brown. With the change of time, the lesion will gradually expand into irregular spots. The lesion is very easy to soften and crush. However, it is generally impossible to have a mold layer. Usually, in the early, middle and late days, you can see a dark gray gloss on the diseased spot. The root cause is the pathogen of pathogenic bacteria. In severe cases, many diseased spots are produced on the leaves, which is very easy to cause the leaves to smash.
2. The regularity of the disease is similar to other diseases, and the pathogen of towel gourd brown spot will spend the winter in the soil layer and the disabled body in the form of mycelium. In the next spring, when the ambient temperature is suitable, the wind, rain and other substances are used to spread. The conidia of pathogenic bacteria will invade according to the exhaust port of Luffa plant after germination. However, after the onset of the disease, the diseased spots caused by strong plants will produce conidia to spread and cause reinfection. The disease spread rapidly in the field after the onset. Pathogenic bacteria are more serious under the condition of high temperature and humidity, so we should pay more attention.
3. Preventive Countermeasures In the case of planting loofah, it is best to take high ridge planting as the leading factor. And in the whole process of planting, it is necessary to do a good job in ditching and drainage pipes to prevent water storage in the fields from causing high and low temperature natural environment. If the disease is serious, it is necessary to carry out at least 2 years of rotation work with vegetables and fruits other than melons. Apply enough organic fertilizer, do a good job of fertilization, and pay special attention to adjusting the base fertilizer when applying fertilizer. Irrigation should be dominated by small water and diligent irrigation, rather than flooding. Do a good job of drainage pipeline after rainy days. Then, after picking melons every autumn, we should do a good job in soil disinfection, and bring the disabled and weeds out of the field for damage. Moreover, it is necessary to pay attention to the disinfection and sterilization of the soil in the work of ploughing and subsoiling. At the fruiting stage, soil testing and fertilization should be taken as the leading factor to meet the nutrient requirements for the growth and development of Luffa. The diseased leaves should be removed immediately before the onset of the disease to prevent the spread of the disease. Then rational use of drugs to prevent, drugs can be dominated by drugs such as mancozeb and metalaxyl copper. It is necessary to carry out garden-level disinfection and sterilization to solve pathogenic bacteria and prevent some unnecessary damage.