1 The correct selection of drugs: Each pesticide has a certain range of prevention and control of the object, before use to understand the performance of pesticides and the use of methods, according to the characteristics of the shed and the object of the correct selection of drugs, to achieve a targeted. In rainy and snowy weather, dust agents are generally used to reduce the air humidity in the shed. 2 The right medicine: accurately distinguish between physiological diseases and invasive diseases, confirm the types of pests and diseases, and achieve the right medicine. 3 timely medication: According to the law of the occurrence of pests and diseases, pesticides should be applied in the early stages of the occurrence of pests and diseases to control the occurrence of pests in the spot to prevent the spread. Taking into account the warm and humid environment in the shed, it is not appropriate to spray on cloudy or rainy days to prevent excessive humidity and reduce the efficacy of the shed. Under high temperature conditions, sulphur preparations are used to prevent diseases of melons and vegetables in order to avoid phytotoxicity. 4 even anti-drug dressing: After the occurrence of pests and diseases, it is generally necessary to prevent and treat 2 to 3 times in a row, each time between 7 and 8 days. During the prevention and treatment process, attention should be paid to the rotation of drugs, and pesticides of different types and different mechanisms of action should be alternately used. 5 standard application of pesticides: In strict accordance with the instructions on the use of concentration and dosage of medication, spray, dusting must be comprehensive, uniform spray spray, usually in the morning, in order to increase ventilation after the temperature in the greenhouse, reduce the humidity within the greenhouse . Aerosols are generally used after closing the greenhouse in the evening, and attention should be paid to arson. 6 safe use of drugs: in the production of vegetables should use high-efficiency, low toxicity, low residue pesticides, avoid arbitrarily increase the concentration of the drug, the number of medication can not be too much, strictly according to the interval medication, to prevent vegetable phytotoxicity, reduce pesticide residues . The use of highly toxic pesticides such as organic chlorine, carbofuran and methamidophos is prohibited. 7 Rational mixing: appropriate amount of fertilizer or foliar fertilizer can be added to pesticides. However, it should be noted that the first thing to know about the characteristics of various medicines is to mix them. Otherwise, it would be counterproductive. For example, bactericides such as zeocin and zesinam are easily decomposed by alkaline substances and cannot be mixed with lime sulfur or Bordeaux mixture.
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Use of pesticides in winter greenhouses should pay attention to what the problem
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