First, yellow leaf spot is caused by the pathogenic fungi of the genus Fusarium. It is one of the major diseases of day lily, also known as "flood disaster" and "water maggot". It is the earliest disease of day lily. Serious damage can cause all dead, no flowers can be received. After the onset of general incidence will reduce 30-50%. (I) Incidence of disease The occurrence of diseases is mainly related to climate, cultivation and management, and varieties. Climatic factors are important causes of disease and disease epidemics. The pathogenic bacteria overwintered with the plant residues. In April-April the following year, the temperature rose and the germs invaded the tender seedlings. If the temperature changes or the rainy weather occurs, the relative temperature is large, and the disease is easily prevalent. From the aspect of cultivation and management, the land that has been planted for a long time is more severe, and the disease resistance of the younger plants below 15 years is strong; the disease in the winter where the pipework is done well is lighter, and nitrogen fertilizer is re-applied. If the application of phosphorus and potassium fertilizers is neglected, the disease will be heavy. (B) Prevention and control methods (1) Strengthen cultivation management Each year, lily picking is finished, lime sulfur powder is applied to 50-100 kilograms or black and white powder 100-150 kilograms per acre, and then sunny excavation or guest soil is selected. For those over 15 years of age, calluses should be refurbished and updated to enhance their growth potential and their resistance to disease. (2) Appropriate application of fertilizers Day lily should be dominated by the application of organic fertilizers. The use of chemical fertilizers should use nitrogen, phosphorus and potassium in combination with compound fertilizers to avoid leggy and reduce disease resistance. (3) Chemical control 1 Every spring, the seedlings are unearthed and sprayed with the same amount of Bordeaux mixture or Baume 0.5 degree lime sulfur, sprayed once every 10-15 days, and sprayed 3-4 times in total, which has a certain effect. 2 At the beginning of the onset, use 50% thiophanate WP 800-1000 times, 50% carbendazim WP 800-1000 times, and 75% chlorothalonil WP 600-800 times every 7- 10 times a day, spray a total of 2-3 times. Second, yellow leaf blight is caused by the pathogenic fungi of Staphylococcus. The disease is widespread and serious in the day lily area. Serious victims can make a whole block withered, without flowering or only part of the plant bolting, seriously affecting yield. (I) Incidence of disease The incidence of this disease is slightly later than that of leaf spot. It usually begins in late April and is fastest growing in May and June. In areas with heavy rain, high humidity, and poor drainage, the disease is heavy, and the dense and young crops are heavy. Plots with a single application of nitrogen fertilizers or nitrogen fertilizers are more severe than those with organic manure. (B) Prevention and control methods 1 Strengthen the cultivation and management of timely cultivating loose soil, strengthen the management of autumn and winter cultivation, rational application of nitrogen, phosphorus and potassium fertilizers, promote the robust growth and development of plants, thereby enhancing the plant's resistance. 2 Chemical control Every year before and after Ching Ming, the same amount of Bordeaux mixture is sprayed, sprayed once every 10 days, and sprayed 3-4 times in total, which has a certain effect. In the early stage of disease, the leaves may be sprayed with 50% carbendazim 600-800 times, or 50% 500-600 times, or 50% of rice bran 600-700 times.
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