The cabbage mustard, also known as meat mustard, is one of the main vegetable varieties of winter and spring leafy vegetables. The meat is hypertrophic, sweet and delicious, can be fried together with meat, and can also be used to pickle sauerkraut. Yangchun City grows more than 22,000 mu of mustard every year, and generally produces 2500-3000 kg per mu. The yield is high and the economic benefits are good. However, if it is not properly managed, pests and diseases are easily caused, affecting the yield and quality. The pest occurrence and control methods of Brassica juncea are described as follows: 1. Viral disease: The virus disease mainly occurs when the temperature is low in 11 to 12 months. The disease started from the seedling stage, and the main veins of the leaves changed from dark green to yellow-green, slightly transparent, and the leaves showed mottles of different depths. The leaves were then shrinking, hard and brittle, and the plants were obviously dwarfed. Some plants were Half of the normal side shrinks, and some plants are like open peony flowers. Immediately after the onset of the vegetable field, the central diseased plant should be removed, and sprayed with 20% of the virus A500-fold sprayed, sprayed once every 5-7 days, and sprayed continuously for 2-3 times. At the same time, it is necessary to strengthen the control of locusts to prevent locusts from transmitting the virus. 2. Downy mildew: The disease mainly damages the leaves. On the back of the disease, there is a green point on the back of the leaves. The lesions were light yellow water-stained dots at the beginning of the lesion, and the lesions were polygonal and pale brown due to limitation of veins. Once the disease is discovered, it must be immediately applied to prevent and cure. It can be sprayed with 70% 300mg/100-fold of aluminum-aluminum-manganese-zinc or 70% of mancozebite 500 times, spraying once every 7-8 days. 3. Soft Rot Disease: The disease mainly damages leaf stems and leaf balls. Symptoms were not obvious at the time of first onset. The petiole and the base of the leaf bulbs were yellowed, and the meaty part was water-stained and gradually spread outward. The leaves wilted at noon and recovered sooner or later. With the development of the disease, the epidermis of the diseased area ruptured, the tissues of the leaves and stems rotted, the sap overflowed outwards, the outer leaves scrambled around, and the leaves were bare until the whole plant fell to the ground. The disease is prone to spread when it is cold and rainy, or when the rain is clear and the temperature rises. Once the disease occurs, the diseased plants should be immediately removed, and lime powder should be disinfected in the diseased points. Simultaneously, streptomycin sulfate should be sprayed with 2500-3000 times or 14% coloammonia copper 300-500 times. 4. Black spot: The disease mainly affects the stem. At the time of initial onset, the outer epidermis of leaves and stems showed scattered green spots, and the lesions showed pale yellow water-stained dots at the beginning of the lesion, followed by rapid and obvious lesions. Irregular ring marks appeared in the lesions, black molds appeared in the later stages, and black lesions appeared in the end of the knot. The disease is prone to spread under conditions of temperatures around 20°C and rainy conditions of high temperature and humidity. Once the disease was discovered, it could be treated with 70% mancozeb 500 times or 70% thiophanate-methyl 1000 times. The effect was significant. 5. Yellow song jumps: Adult body about 2 mm in length, long oval, black shiny, bite to eat the plant leaves into many small holes, the seedling period is more serious. Found larvae damage, can be used to control the roots of 90% crystal enemy white pest 1000 times; adults damage, can be used to kill 48% of the Lethburn 1000 ~ 1500 times liquid. In addition, Pieris rapae, Plutella xylostella, Brassica juncea, Vegetable borer damage, can be used fiber insect must be clear, pest control and other insects.
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