Autumn chlorotoxin
Chrysanthemum downy mildew mainly damages the leaves. In the early stage of disease, it produces pale yellow near-circular or polygonal lesions on the old leaves of the plants. The disease then gradually spreads to the upper part of the plant, and the lesions are yellow-brown in the late stage. In severe cases, many lesions are connected. One, the leaves yellowed and died. When the humidity is high, a white mold layer is formed on the back of the lesion. The suitable temperature for pathogenic infection is 15-17°C, and it needs more than 85% relative humidity. There is a large temperature difference between day and night in the fall and the frosting time is long. The disease is prone to occur, and the disease is aggravated in the event of fog and rainy weather. In addition, too dense planting, large groups, excessive nitrogen fertilizer application, poor ventilation, poor light transmission, or poor drainage may also aggravate the occurrence of diseases. Prevention and control of Artemisia halodendron should take comprehensive measures. Severe disease field can be used for 2-3 year rotation with non-Asteraceae vegetables; the planting density should be reasonable to avoid excessive close planting in order to facilitate ventilation and spreading wetness; reuse basic fertilizer, increase organic fertilizer, control the amount of nitrogen fertilizer, prevent leggy; not flood irrigation , timely drainage after heavy rain. At the beginning of the disease, 58% methadium zinc WP can be used as a 500 times solution, or 72.2% Precise can be used as a 1000x solution of hydrochloric acid, or 64% MM can be used as a 500 times solution. 7-10 days once, continuous prevention and treatment 2-3 times. Fields cultivated in protected areas can be smoked and smoked with chlorothalonil.
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