Chrysanthemum planting: what is the leaf blight of Artemisia annua?

What is chrysanthemum leaf blight? Please introduce the causes and control methods of chrysanthemum leaf blight disease only infect the leaves, the disease spot is round or irregular, the center is light gray, the edge is brown. When the humidity is high, there is a black fog on both the front and back. In the later stage, there were a series of disease spots, which caused the leaves to die. The main cause of leaf blight of Artemisia annua is that the pathogen remains on the leaves and dew on the leaves with high humidity, so the disease is easy to occur. Pathogens are spread by airflow. Prevention and control of leaf blight of Artemisia annua: spraying 500x solution of 70% methyl topiramate wettable powder or 1500 times liquid of 50% prohydantoin wettable powder at the initial stage of onset. Once every 5 Murray for 7 days, spray 2 Murray for 3 times. In addition, chrysanthemum chrysanthemum is also easy to get downy mildew and virus disease, the control measures are the same as other vegetables. Click to get more chrysanthemum planting techniques click to get more vegetable planting techniques