Moss also occurs in stagnant water. Some floating water is on the surface of the water, and some are rooted in bottom mud. When the temperature is high, the topdressing of humans is also prone to moss. Lime ponds have grown up with moss and the water quality has deteriorated. When they are serious, the stems and leaves of leeks also grow moss on the shoots, which not only impedes plant growth, but also directly pollutes the product, affecting the quality and even causing the product to lose moisture. The prevention and control of green stems is mainly to keep the pool water clean and flowing, so as not to allow the sewage to enter the pool. Fertilizer should be used when fertilizer is not used during dressing. Every time amaranth is harvested, it can be removed manually. Can also use chemical agents in addition to moss, with 300 grams of copper sulfate, 300 grams of right ash plus 12.5 kilograms of water is made with the same amount of Bordeaux mixture, sprayed in the place of long moss, washed after washing clean Zhen surface, the effect is very good. But do not use copper sulphate spray alone, otherwise it will cause harm to leek. The common disease in the leek pool is leaf rot, which mostly occurs in pool water, and the water is pale yellow or brown. There is a pool of rust and floating foam on the surface of the water. In the case of more moss, leaf rot is also prone to use fertilizer as much as possible. According to the above method, equal amount of Bordeaux mixture can be sprayed to prevent and control. The pests that damage the leek mainly include vertebral real screw, leek roll leafhopper, white silkworm, root water leaf leaf, leaf nail, aphid, and flat coil. Serious damage. With the exception of root stems, which are mainly responsible for the underground stems, the rest are for the leaves and shoots that float on the water. Prevention of vertebral snails in the March when the leek germination, the vertebral real snails are mostly concentrated around the leek pool and running water. The vertebral snails are mostly concentrated around the leek pool and the water outlet. At this time, they are manually removed every day; Gallo is sprayed and sprayed with 75 grams per 10 kilograms of water. It can also treat both leafhoppers and leafhoppers. For ponds that suffer from chronic waterborne leaf beetles all year round, they can be controlled by dish cakes, and 75-150 kg of uncooked cake powder per hectare can be used to kill the larvae in the larvae. Organic fertilizers can be added. Grass is a major obstacle to the production of leeks. It often causes major losses when it occurs. The common and more harmful are eye dishes, amaranth, tetraphylla, black algae, myriophyllum, alga, algae, and goldfish. The control of weeds in the early stage was mainly based on the removal of sub-leaflets, four-leaf peony, and leeks. These weeds germinate early and grow faster. Therefore it can be removed before the leeks. After the leeks germinate, they can be manually removed each time they are harvested; or they can be put in pool water on the evening of the same day. After the morning of the 2nd day, the weeds can be rushed out of the pond and the weeds can be removed from the pond. High temperature sun dried leeks. Chrysospora can be used 250 grams of copper sulfate plus 25 grams of right ash, plus 20 kilograms of water, dubbed liquid, splashed in the growth of goldfish algae, and then washed with water on the leek leaves of the liquid, the control effect is better. But note that if the pool water temperature exceeds 30 °C, the amount of copper sulfate and lime should be reduced, otherwise the leek is easy to produce phytotoxicity. In addition, biological weeding measures can also be used to fish and weed in the pond. By the end of May, 900 to 1200 tail grass fry per hectare, or 600 to 800 grass carp weights of 500 g tail weight per hectare, will also have better weed control effects. After the end of the leeks in November, the pool must be cleared to catch grass carp.