What is Magnolia brown spot?

What is Magnolia brown spot? Please introduce Magnolia brown spot disease, also known as spot disease, is a common disease of Magnolia magnolia. The disease occurred in all the areas where Magnolia was cultivated in China, and the disease was more serious in Suzhou, Nanjing, Wuhan, Shenzhen, Tianjin and Shenyang. The symptom is that the pathogen mainly infects the leaves. The diseased leaves initially appeared light brown or yellow dots on the surface, one enlarged into round or irregular spots, 5-12 mm in diameter, dark brown at the edge, grayish white in the center, and many black dots on it. The disease spots can merge into amorphous large-scale necrotic damage. The disease is serious and often causes a large number of fallen leaves, affecting the landscape. The pathogen is the law of the occurrence of bacteria. The disease usually begins to occur in summer and the harm is more serious from August to September. Prevention and control methods: 1. Magnolia should be planted in places with fertile soil and plenty of sunshine. On the barren soil. It is necessary to apply more fertilizer to strengthen the tree potential and improve disease resistance. 2. Whether in the courtyard or in the street green belt, it is necessary to remove the diseased leaves in time and destroy them centrally. The seedlings in the nursery should pay more attention to sanitary management, remove diseased leaves as soon as possible and reduce the source of infection. 3. The initial stage of the disease in summer every year. It can be sprayed with 100-fold Bordeaux liquid for protection. In the future, 50% methyl thiophanate wettable powder or 75% chlorothalonil wettable powder can be sprayed 800-1000 times to control the spread of the disease. Click for more magnolia planting techniques click to get more flower planting techniques