At present, the cabbage in the Beijing suburbs is generally at the seedling stage, but recently it is hot and rainy, with many insect pests, and it is susceptible to a variety of diseases. Therefore, prevention and control of pests and diseases at the seedling stage are critical to the production of Chinese cabbage. Scientific management to cultivate strong seedlings 1. The seedlings will be given in divided doses. When the cabbage seedlings are in two leaves and one leaf and 4-5 leaves, the seedlings are divided and the leaf shape is normal and robust. After the seedlings, the seedlings are planted according to the characteristics of the varieties, and the seedlings are cut off and the weak seedling diseased plants are filled in time. Plant replacement. 2. Reasonable water and fertilizer should not be flooded. The water requirement at the seedling stage is not large, but the temperature is high and the evaporation is fast. The water should be added in a timely manner to keep the soil moist and can be combined with fertilization and fertilizer supplementation. Such as the growth of weak seedlings, point 2-3 times 200-300 times the urea water, prompting the growth of weak seedlings; in the early and mid-ball rushed compound fertilizer 10 kg / acre. Avoid flooding and prevent the spread of diseases such as soft rot and black rot. 3. Weeding and weeding are indispensable. In the seedling stage, the cultivator will plant 2-3 times of cultivating time to loosen the surface to prevent the water from disintegrating and losing too quickly. At the same time, weeds will be removed to reduce the occurrence of diseases and insects. The depth of tillage after tilling is 5-6 cm, so as to promote root growth. Timely Inspection of Seedling Pests and Diseases Aphids and whiteflies: Yellow plates can be used to trap or kill the silver-gray reflective film on the ground, or use high-performance cypermethrin, avermectin, aktam, imidacloprid, matrine, etc. Plutella xylostella, Pieris rapae: Sex attractant can be used to trap and kill Plutella xylostella; Bt emulsion, azadirachtin, Azithromycin, avermectin, etc. control larvae. Flea and fleas: The use of high-efficiency cypermethrin, or high-efficiency eradication of 100 grams, or killing milk spray control. Soft rot: At the beginning of the disease, spray control can be used such as streptomycin, neomycin, Garrinone, and chlorpyrifos. Downy mildew: In the early stage of disease, it can be controlled by sprays such as DuPont Kelu, Antivirus, Ank manganese zinc, metalaxyl and other agents. Viral disease: A small number of occurrences are recommended for timely removal, and at the same time, it is necessary to control the transmission media such as aphids and whiteflies. Note: 1. The chemical should be used or reconstituted in order to avoid drug resistance. 2. The use of highly toxic and high residual chemical pesticides is prohibited. 3. Rational use of drugs in combination with weather conditions, pay attention to human and animal safety. Frozen Mussels,Frozen Cooked Clean Mussel Meat,Cooked Mussel Meat,Seafood Mussel Meat Shengsi Huali Aquatic Products Co.,Ltd , https://www.mytilus-edulis.com
Chinese cabbage seedling disease inspection