In winter, with rain, snow, and fog, the ventilation of the greenhouse is poor, and the humidity is high. Because of the special environmental conditions, the occurrence of the disease is more serious. Using the spray method is time-consuming and laborious and increases the humidity of the greenhouse. Therefore, it is worthwhile to improve greenhouse vegetable disease prevention methods. There are three measures: 1. Covert application methods: Insecticides and fungicides are added to seed coating agents, or processed into tablets or granules. In the middle, let the crops absorb the drugs through the roots and transport them to various parts of the plant tissues, which has a good effect on the killing of earthworms, cockroaches, cockroaches, cockroaches, and underground pests.
2. Smoke application method: The aerosol agent made with the prevention of the disease as the main component can evenly release the pesticide in the form of smoke after ignition, and play the role of bactericidal and disease prevention in the confined space of the greenhouse. At present, the pesticide species that can be used for greenhouse smoke agents are increasing year by year. Dichlorvos and chlorothalonil are common and can be used to control cucumber downy mildew, epidemic diseases, tomato early blight, late blight and gray mold, and grey mold of chives. And locusts, and a variety of vegetable pests and other insect pests. Some vegetable farmers use sawdust to absorb diuretic emulsifiable concentrates in the shed, and use 80% dichlorvos EC 300-400 milliliters per acre, mix in 3 to 4 kilograms of sawdust, and conduct smoke prevention and control, which is easy to operate and does not require any medicine. , Save time and effort, economic convenience, high efficiency and stability. The time for using aerosols is appropriate to ignite in grass in the evening and it is best to ignite the aerosols in cloudy or snowy evenings to prevent disease and disinfestation. Apply once every 7 to 10 days, 2 to 3 times in a row to receive good results.
3. Dust application method: Dust agent is a new type of pesticide. It is produced by special processing of pesticides to become fine solid particles. The dust agent has a unique flying effect, so that the pesticide dust particles can freely and evenly fall on the stems and leaves of vegetables to prevent and kill diseases. The currently used dust agents are: 10% chlorothalonil compound dust agent, can control cucumber downy mildew, cucumber powdery mildew, cucumber anthracnose, tomato disease; extermination dust agent can control aphids, whiteflies, etc.; morpholine dust The agent controls cucumber sclerotinia disease, tomato gray mold, leeks and other vegetables such as gray mold; 5% anti-bacterial dust agent to prevent cucumber leaf spot; 12% no dust agent to control cucumber downy mildew and keratopathies in Applied at the time of concurrent use; 10% chlorhexidine dust agent prevents and control tomato gray mold, early blight, and leaf mold; 10% procymidone dust agent prevents tomato leaf mold, gray mold, cucumber gray mold, sclerotinia, etc. . The dust agent is generally applied before or at the beginning of the disease. The dosage per kilogram of the greenhouse is 1 kilogram per time, once every 7-10 days. It is best to do it 1 hour before or after the morning or late evening ventilation. In this method, the plants are evenly distributed, the chemical loss is small, the utilization rate is high, and the control effect is good.
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