Loofah is a kind of high-quality vegetable that people love. However, due to the occurrence of diseases of different degrees, it causes a certain degree of loss every year and affects the income of vegetable farmers. The author investigated the major diseases of loofah and introduced a simple introduction to the prevention and treatment techniques. It is hoped that this will help the production of loofah and loofah in the greenhouse. The main disease types and symptoms of loofah Downy mildew The disease mainly damages the leaves. The diseased leaves first appear irregular yellowish to yellowish lesions, and then expand into polygonal brown spots. When the wet spots appear, the back of the lesions appear purple layer of mycoplasma, and later lesions are connected and the leaves die. Severely reduced production. The source of downy mildew in cucumber and cucumber downy mildew belong to the same kind of pathogen. The pathogenic bacteria overwinter over winter, low temperature and rainy weather, high air humidity, large temperature difference between day and night, flooding in the shed, are conducive to disease. Field cultivation of bacteria spread by wind and rain. anthrax Lesions present with concentric ring patterns are the main features of the later stage of the disease. At the beginning of the disease, it was a pale yellow, almost round, small spot, which expanded into a dark brown color with a rim. When the lesion was dry, it was easily perforated and ruptured. In severe cases, the leaves died prematurely and severely reduced production. Melon vines and petiole sensation, the lesion is oval dark brown pitted spots, when the humidity is high, the lesion site overflow pink mucus. High temperature, high humidity, and more rain are conducive to the occurrence of anthrax, and the pathogenic bacteria overwinter on the diseased bodies with mycelia and conidium discs. Blight The main damage is fruit, and sometimes vines and leaves are also affected. The onset of fruit disease mostly begins with the flower pedicle, the lesion is sag, and the water stain is dark green at the beginning. When the humidity is high, the melon rots rapidly and has white mold. Stem culm infection mainly in the tender stem or internode, the initial water-stained, after the expansion of wet rot, dark brown. The onset of the leaves is yellowish-brown spots with water-stained spots. When the humidity is high, a layer of white mold grows. When it is dry, it is bluish-white and easily broken. powdery mildew It mainly damages leaves, petioles and stems. On the back of the blade, a round or irregular white spot was born on the back of the blade. Later on, the leaves became yellow and dry. At the early stage of the disease, it is not easy to find out. After serious disease prevention and control, and affecting the yield, prevention should be the main focus. Rushan Jinguo Food Co., Ltd , https://www.jinguofood.cn