In recent years, as a result of comprehensive promotion of new technologies such as greenhouse cultivation, soil conservation, and scientific management of fertilizer and water, the yield and economic benefits of Chinese Wolfberry continue to increase. However, diseases such as white spot disease, rust, sheath blight, tinea sclerotiorum, pyzlococcus sclerotiorum, and ash disease have also occurred in succession. In particular, the occurrence of flax leaf spot disease is widespread, spreading rapidly and causing serious damage. The incidence of the general greenhouse leaf is 57.5%. The incidence of severe greenhouse leaves is as high as 95%, and most of the leaves turn yellow to death, resulting in a severe reduction in production of white rice, which tends to increase year by year. First, the symptoms of the disease mainly damage the disease leaves, leaf sheaths can also occur. The leaves were affected by needle-like brown dots at the beginning and expanded to round, oval, and fusiform lesions. The size and shape of the lesions ranged from sesame seeds to gray to yellow in the middle, dark brown on the edges, and surrounded by yellow halos. In severe cases, the lesions are densely covered with leaves, and they heal into pieces, resulting in a larger area of ​​necrosis. Deadly leaves gradually die from the tips of the leaves or leaves. Leaf sheath lesions are large and small. When it is wet and wet, black mold, conidial stems and conidia of the pathogen are produced on both sides of the diseased part. Second, the incidence of the disease èŒ èŒ èƒ¡ 胡 胡 胡 胡 胡 胡 胡 胡 胡 胡 åŠ åŠ åŠ åŠ åŠ åŠ èŒ èŒ èŒ èŒ èŒ èŒ èŒ. The pathogens overwinter on host and diseased bodies with mycelia and conidia. The first infestation was performed with conidia in the following year, that is, when the conditions were suitable, the spores of the pathogen spread to the host leaves with air currents and rain, and then penetrated directly into host epidermal cells or directly invaded from the stomata. The conidiospores that develop on the lesion after the onset can be re-infected. In general, greenhouses have high temperatures, high humidity, and poor ventilation and light transmission. Therefore, they are very conducive to the occurrence and serious epidemic of Flax spot disease. In addition, the continuous cropping of Pak Nai, lack of oxygen and potassium in soil, lack of fertility, and the development of densely planted and declining plant growth are also serious. Third, comprehensive prevention measures Avoid continuous cropping and implement crop rotation: According to the actual local conditions, take in the rice stubble after harvesting, ie plant other crops. 2. Strengthen the management of greenhouses and implement scientific cultivation: (1) Select disease-free alfalfa to retain the original source of bacteria. (2) The yellow leaves, diseased leaves and invalid tillers at the base of the plant should be frequently stripped during the growth period to reduce the bacteria source and improve the ventilation and light transmission conditions between the plants. After the harvest, the debris was removed promptly and burned. (3) Proper close planting: The science of Putian, that is, about 20 days after planting and each planting field before plant closure, and removing weeds to loosen the soil to accelerate fertilizer decomposition and reduce disease infestation. (4) Applying basal fertilizer, applying more phosphorus and potassium fertilizers such as plant ash. In the rainy season, appropriate paddy fields should be added to increase soil oxygen content, increase root activity, promote plant growth, and increase disease resistance. During the summer season, proper irrigation of deep water is required to reduce the temperature, and water is changed regularly to control late delivery. 3. Chemical control: At the beginning of the disease, 12.5% ​​Leucococcus WPl5 ~ 25g, 12.5% ​​diniconazole ECl500 ~ 2000 times or 25% enemy force EC2000 ~ 3000 times liquid spray can be selected. Every 15 to 20 days, the disease condition is continuous. Spray 2 or 3 times and stop using drugs before pregnancy. (Author: Taizhou, Zhejiang Institute of Agricultural Sciences Wang Huifu, Linhai agricultural station Zhouxian Xing Xun Town Linhai 317000)
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