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Prevention and Control of Artemisia Leaf Blight
1 Symptoms: The disease is only infested with leaves. The lesions are round or irregular, with a light gray center and brown edges. When the humidity is high, black fog appears on the back side. Later lesions contiguous, resulting in dead leaves. 2 onset conditions: pathogens remain on the leaves. Humidity, large leaf surface condensation, the disease is prone to occur. Pathogens are spread by air currents. 3 Control measures: 70% thiophanate-methyl wettable powder 500 times, or 50% acetaminophen wettable powder 1500 times in the initial stage of disease. Once every 5-7 days, spray 2 to 3 times. In addition, Artemisia halodendron is also easy to get downy mildew and virus disease, and control measures with other vegetables.