The main conditions for the occurrence of pests and diseases in greenhouses are temperature, humidity, source of bacteria, disease resistance of varieties, and cultivation measures. The ecological control of greenhouse vegetables is through the control of the above ecological factors, so as to reduce the amount of chemical pesticides and eliminate pollution residues. As a result, people eat more safely and the pests are controlled. I. Ecological control of eggplant, melon gray mold, and disease 1. The regulation of temperature conditions. The low temperature in the greenhouse is the main reason for the occurrence of eggplant and melon gray mold. In practice, high-twin double-film cover is used, and a ventilation window is left every 3 meters in the booth. The grass curtains are opened early in the morning and the curtains are closed in the afternoon. The temperature exceeds 30 °C in a timely manner. When the average temperature in winter and spring is lower than 15°C, close the vents to achieve better insulation effect. 2. Regulation of light conditions. Insufficient light temperature is difficult to guarantee, aging of the film, poor light transmission, and dust droplets all affect the light. Tests determined that the use of non-drip film can increase light about 20%. When building a shed, it is required that the shed be shifted towards the west by about 10 to increase the temperature of the shed. 3. Regulation of moisture conditions. Excessive humidity in the shed is also an important factor in causing disease. For this reason, when the relative humidity in the morning shed exceeds 90%, the air should be released 20 to 30 minutes in a timely manner. Practice has proved that the use of double membrane coverage, under the film watering, timely release, the relative humidity within the shed at 3 pm was 62%; double film coverage, drip irrigation under the membrane was 58%, the relative humidity of the control shed covered by a single membrane was 87 %. 4. Regulation of gas conditions. The carbon dioxide concentration in greenhouses is too low, which affects the photosynthesis of vegetables, weak growth potential, and reduces disease resistance. For some of the sheds with higher management levels, organic fertilizers are required to increase carbon dioxide, or after seeing fruits, the addition of carbon dioxide gas fertilizer from the uncovering of the straw curtain to the noon will significantly enhance the growth of fruits and enhance Disease resistance. II. Ecological control of wilt disease of watermelon and cucumber 1. Soil heat sterilization. Each mu of wheat straw with 500 ~ 1000 kg cut into 4 ~ 6 cm long sprinkled on the ground, and then evenly spread lime 100 kg of lime or quick lime 500 kg, turn the floor, film, irrigation, and then close the studio 15 to 20 days, summer The surface soil temperature can reach above 60°C, which can effectively control the blight, nematodes and other soil-borne diseases. The control effect of the heavy watermelon wilt disease can reach more than 95%. 2. Grafting for roots. Yunnan black-skin squash or southern anvil 1 can be selected as rootstock. Grafting roots of cucumber seedlings and watermelon seedlings can effectively control the occurrence of melon wilt disease. 3. Loofah virus disease prevention and treatment. Loofah seeds are soaked in 0.5% soapy water or 0.1% trisodium phosphate solution for 24 hours before seeding to prevent seedborne disease transmission. 30 to 40 kilograms of plant ash can also be used to spray the leaves before the dew has dried, which can inactivate the virus. In addition not mixed with cucumbers, melons or continuous cropping, so as not to pass each other or transmitted by nematodes. Third, the greenhouse ecological control of whitefly 1. Breed "no insects". The seedlings were thoroughly sterilized before the nursery, and the insects were killed and killed with dichlorvos and the foreign insects were controlled. 2. Reasonable layout. Avoid mixing cucumbers, tomatoes, eggplants, beans, etc. in and around the greenhouse. Promote the cultivation of cruciferous vegetables that do not like to eat whitefly, in order to reduce the source of insects. The first crop of greenhouses in autumn and winter in greenhouses, such as celery, garlic, etc., does not like to eat, vegetables that are more resistant to low temperatures, and other vegetables, can significantly reduce the damage. 3. According to the physiological characteristics of pests to regulate. Whitefly has a tendency to yellow, yellow plates can be trapped and killed in the greenhouse, using discarded fiberboard or cardboard, cut into 1cm 0.2cm strips, painted with orange and yellow paint, and then coated with a layer of viscous oil (No. 10 Add a little butter to the oil. Set 15~20 pieces per acre and place them between the rows, at the same height as the plants. Using the above ecological control technology, the amount of chemical pesticides in the greenhouse can generally be reduced by 60% to 80%. The cost per acre can be reduced by 300 to 500 yuan, and the output can be increased by 20% to 30%, which is conducive to the increase of beneficial biological groups around the greenhouse, such as The amount of stored bees and ladybugs reaches 1.5 heads per square meter, and more than 60% of the fields are larger. The ecological and economic benefits are very obvious. Electric Eyebrow Remover,Electric Eyebrow Trimmer,Automatic Eyebrow Trimmer,Best Electric Eyebrow Trimmer Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizons.com