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French zucchini pests and diseases
First, root rot. The main infestation of the roots begins with water immersion, which then rots, the stems shrink and dry, the vascular bundles at the rot areas of the disease become brown, and the disease stage deteriorates later, leaving filamentous vascular bundles. The initial symptoms of the diseased plants are not obvious at the initial stage. The leaves wilted at noon, and sooner or later they were able to recover. In severe cases, the majority died. Second, stem rot. The humidity in the main greenhouse was large. The germs spread from the cuts of the melons and the leaves. The initial wounds were infected with rot after infection with gums, and the diseased areas turned brown and eventually died of rot. Transmission and disease conditions: The bacteria in the soil invade from the wounds of the roots and stems, and spread by irrigation water. It is susceptible to high temperatures, high humidity and rainy days, continuous cropping, low-lying land, long-term humidity in clay fields or sheds. . Control methods: (1) The greenhouses are subjected to high-temperature sunlight disinfection before planting. (2) The use of sorghum cultivation prevents flooding and stagnant water. (3) Spray 2-3 times at the seedling stage with 3000 times the number of Greenhenge. (4) When planting, use fairy water 75-100 grams to add 15 kilograms of water and pour 0.25-0.5 kilogram per plant. (5) Apply 3-5 times regularly with Toyota Gold Potash. (6) Pick melons, spray tyrophanine, root rot, carbendazim, and smear wounds promptly after leafing. Third, virus disease. Symptoms: There are dark green lesions on the leaves. The leaves of severely diseased plants become yellow-leaf deformities like chicken feet. The leaves are thin, the chlorotic leaves become smaller, the diseased plants have fewer or no melons, and the melons have tumor-like protrusions or deformities. . Transmission route and disease conditions: spread by watering, aphids, whitefly, etc., and the disease is severe under conditions of high temperature and drought, strong sunlight or lack of water, lack of fertilizer, and extensive management. Control methods: (1) Apply enough base fertilizer, timely watering and intensive fertilizer to strengthen management and promote root development. (2) Be careful not to bring hot virus into the greenhouse during seedling emergence. (3) Timely prevention and control of various insect pests, timely removal of sundries, spraying of anti-viral drugs such as bactericidal agent, virus A, phytosanitary psychic, and 83 antagonism agents in the early stage of disease, once or twice a day for 10 days, continuous prevention and treatment 2-3 times. Fourth, powdery mildew. Symptoms may occur from the seedling stage to the harvest stage. The incidence of leaf disease is heavy. The petiole and stem are secondary. In the early stage of disease, there are white, round and small white spots on the leaves, young leaves and young stems. The leaves have many back surfaces. Afterwards, it was expanded into a contiguous white powder with unclear edges. In severe cases, the entire blade was covered with white powder. In the late onset period, the white mildew turns gray, and black spots are formed on the lesion. Transmission route and onset conditions: 10-25°C can be affected. The onset rate is very fast, and the disease often occurs overnight. The humidity in the shed is too large or the occurrence of chilly and sudden sunshine occurs. When the temperature in the shed is too high, the tuyere is blown out. As soon as it is easy to be affected, it is easy to develop from below the tuyere. Prevention: Observe every day and find that small white spots are sprayed with Fuxing, Guafen or omeprazole in a timely manner. Spraying should be carried out in the afternoon, and must be exhaustive. The diseased leaves that are laid down should be brought to the outdoor burial at any time. Fifth, gray mold. The main hazard is the flowers, young fruits, stems and larger fruits of the zucchini. The peduncles of flowers and young fruits are initially immersed in water, gradually softened, and the surface is densely green. The fruit eventually shrinks and rots, and sometimes black sclerotia grow inside the diseased fruit. Transmission route and onset conditions: germs are lurking in the soil, when the humidity in the shed is low and no light is available, germs come out from the soil and spread with the wind and agricultural operations. Proper temperature 13-23°C, humidity 90%, and even cloudy days The temperature is low, humidity is high, and the onset of illness is severe when the wind is released. Control methods: (1) Apply "Guoguoning No.2" at the time of flowering. (2) Strengthen the management of the shed and keep the shed clean, airy and light-transmitting. (3) At the beginning of the onset of the disease, the greenhouse was closed, and the quick-acting smoke agent was used. The Beijing-made Tianqing ashbaobao was fumigated with good results. (4) The effect of spraying is very good when mixed with Propiacillin, imported Suiking, Greenhenge 5 and Toyota Foliar Fertilizer.