In the cultivation process, it is inevitable that various pests and diseases will occur. Therefore, prevention and treatment of pests and diseases is one of the problems that most growers want to know. Let's learn about the main technical points of pest control in the following sections. First, the locust Aphids are catastrophic pests in the production of alfalfa. They have a great impact on the yield and quality of alfalfa. They mainly concentrate on the shoots, leaves and leaf bases, which seriously affect the flowering results and growth. 1. Agricultural control. (1) Strengthen the management of the garden, adopt the formula fertilization technology, prohibit the excessive application of nitrogen fertilizer, and properly water the water. (2) In the early spring and late autumn, timely clean up the pruned, dead, sick, and insect branches, together with the litter leaves around the garden, and concentrate on burning outside the garden to eliminate the insect source. (3) Unified Qingyuan 1 time each spring. 2. Chemical control. Spraying with 3% acetamiprid 2000 times solution or 10% imidacloprid 2000 times solution, the control effect can reach more than 95%. Second, 枸æžç˜¿èž¨ The end of August and the beginning of September are the peak period of the occurrence of cockroaches. The leaves, flower buds, young fruit, tender stems, petals and flower stalks of the cockroaches are damaging. After the murder, the flower buds cannot be flowered, and the leaves are not flat. When severe, the whole eucalyptus grows weak and leaves the leaves, causing a reduction in yield. Seriously affect the yield and quality of alfalfa. For the control of cockroaches, it can spray 1.8% avermectin 2000 times solution on the foliar surface, and the control effect can reach more than 90%. Third, live up to the mud worm The worms are the main leaf-feeding pests of the cockroach. They have a single feeding habit, mainly the leaves of cockroaches. The larvae are more serious than the adults. If it is a bud, it will make the cockroach not properly shoot the leaves. 1. Agricultural control. In the winter, the litter and weeds under the trees are cleaned, and the pastures are cleaned in the early spring, which can effectively reduce the number of wintering insects. 2. Chemical control. The imidacloprid 1500 times solution plus beta-cypermethrin 1000 times solution was used for spray control, and the mortality of the worms was over 90%. Fourth, chalky mildew The white powdery mildew is mainly harmful to the leaves. When it occurs seriously, the plant of the cockroach appears white, which causes the leaves to gradually turn yellow and fall off easily. 1. Agricultural control. (1) Choose a place where the soil is loose and fertile, well drained, open and well lit. (2) From the end of autumn to the beginning of spring, combined with the field management measures such as pruning, ploughing, and applying base fertilizer, completely remove the leaves, weeds, and sick bodies in the park, and concentrate on deep burial or burning. (3) Do not over-tighten the planting, and remove the dense branches in time to ensure the ventilation and light transmission in the garden. 2. Chemical control. Spray 15% powder rusting 1000 times solution before germination in spring; spray 1:1:200 Bordeaux mixture at the beginning of the disease, spray once every 10 days, continuously spray 2~3 times; spray 15% powder rusting WP 2000 during the onset period Double solution, or 40% crystal stone sulphur mixture 300 times solution, spray once every 7 to 10 days, according to the condition can be continuously sprayed 2 to 3 times. The medicine was stopped 20 days before the harvest to ensure the quality of the fruit. Five, root rot The root rot disease is widespread and the damage is serious. The mortality of plants suffering from the disease is 3% to 5% per year, causing great losses to the production of alfalfa. The disease mainly damages the rhizome and roots. The diseased part is brown to dark brown at the beginning of the disease, and then gradually rots. Later, the outer skin is shed, leaving only the xylem, and the vascular bundle browning can be seen. When the humidity is high, the patient comes out with a layer of white to pink hyphae. The upper part of the leaves is yellow or the branches are atrophied. In severe cases, the branches or the whole plant die. 1. Agricultural control. (1) Newly built gardens should be selected on sandy soil with high dryness, and it is strictly forbidden to plant diseased seedlings. (2) The diseased plants were found to be excavated in time, and the plants were replanted, and the lime was disinfected in the diseased holes, and new soils could be exchanged if necessary. (3) It is recommended to apply compost and decomposed organic fertilizer prepared by Japanese enzyme bacteria. 2. Chemical control. (1) Spraying 50% wettable powder 600 times solution at the beginning of the disease, or spraying 20% ​​methyl chlorophosphorus emulsifiable concentrate 1000 times solution, or watering 45% dexamethasone aqueous solution 500 times solution, after 1 and a half months, it can be rehabilitated; 25% carbendazim wettable powder or 65% dasen zinc wettable powder 400 times solution, can also be recovered after 2 months. (2) For areas or fields where root rot is caused by Rhizoctonia solani, try to use a transplanting mixture. In the early stage of the disease, the roots of the diseased plants were watered with 300 times of the Aleks. Adding seaweed rooting agent when rooting - root treasure, can promote rooting, the effect is better. At the same time, use Qinglulik 300 times liquid and 15 ml of garlic oil for spraying, spray once every 3 days, and spray 2 or 3 times. Cable Reel,Water Hose Reel,Water Hose Cable Reel,Commercial Water Hose Reel NINGBO QIKAI ENVIRONMENTAL TECHNOLOGY CO.,LTD , https://www.hosereelqikai.com