Most of the public green space is located in the urban area. The geographical conditions are complex, the environment is small, the microclimate is varied, the flow of people is large, and the plant variety is abundant. Therefore, in the prevention and control of pests and diseases, emphasis should be placed on safety. In particular when using chemical pesticides, it is necessary to pay attention to the safety of drugs to humans, the environment, and natural enemies, so that they can be used scientifically and reasonably. First, the rational choice of drugs for biological agents of choice, its long-lasting effect, economic security, does not pollute the environment. Bacillus thuringiensis and Beauveria bassiana can control the larvae of lepidopteran pests (Prunus persicae, Cinnamomum camphora, and caterpillars from the sky, etc.); antibiotic bactericidal insecticides, and 1.5% polyoxymin are used to prevent and treat colorectal defoliation. Secondly, specific insect growth regulators are selected to kill pests by accelerating or inhibiting pest growth. 5% triflumuron or 25% diflubenzuron 3 had better control effect on the blood-spotting moths and the eggs and larvae of the moths. There is a kind of parasitism parasitism on the conidia of the powdery mildew of the crape myrtle, so that it loses its germination power and can reduce the hazard of powdery mildew. Again, we must use high-efficiency, low-toxic, low-residue pollution-free pesticides. 10% imidacloprid, % spray control embroidered Jerusalem artichoke, pear hibiscus and so on. 80% of Dasheng or 20% of the net or 15% of broomstick net anti-caries control hawthorn leafhoppers and apple all claws, 50% of Lifan farmers control aphids, scale insects and so on. The use of chemical pesticides should try to use selective pesticides, less broad-spectrum pesticides to protect natural enemies. And it is necessary to rotate the drug rationally. A drug can be used no more than twice a year to avoid drug resistance. Second, timely use of garden technicians should be diligently observed, and more engaged in investigations and studies, according to the number of pests and pests and the development of pests to determine whether the use of drugs and medication appropriate period. Hawthorn red spiders, when the wintering female adult clams reach an average of 1 per bud. The prevention and treatment of moths should generally be before the third instar. At this time, the body of the moth is small, often intensive, harm is light, and the drug resistance is weak. With fewer pesticides, better results can be achieved. Lawn armyworms occur from May to August each year, and when it reaches 5 to 10 heads per square meter, it is suitable for control. The response of different insect states to pesticides is different, and it is an opportune time for the control of pesticides before the egg hatches until the third instar. The heartworms, leaf miners, etc. should be administered before eggs and larvae hatch before drilling. Ballkins, cedar turtles, waxes, and other insects should be applied before the secretion of wax to form a shell. According to the distribution of diseases and insect pests, leaf roller moths, aphids, and powdery mildew are more harmful to new shoots, and early damages of cockroaches are mostly concentrated on the leaves of stems of the internal tibia. According to the situation, it is important to spray medicine to prevent the spread of pests and diseases and reduce the number of medications. Third, the correct use of drugs strict pesticide dosage and concentration, the use of pesticides is lower than the effective concentration, it is difficult to achieve the necessary control effect, more than the scope of the effective concentration, both waste, but also easy to produce injury, pollution of the environment. When spraying the liquid, keep an even pressure. The sprayer should be more than half a meter away from the leaf to ensure the atomization effect. The spraying should be even and thorough. The spray should be from top to bottom, from the inside to the outside, and it must not be sprayed or sprayed. It is advisable to be wet and not to form small droplets. Always spray the spray gun or apply single or multiple spray heads to ensure atomized quality. Have a good grasp of the time of spraying, spray medicine every day before the dew does not dry or hot noon at high temperatures, so as not to produce phytotoxicity. IV. Safe Use of Medicines The use of chemical pesticides in public green areas requires that humans, livestock, natural enemies, plants, and other beneficial biological safety issues be considered first. In densely populated areas, residential areas, etc., spraying pesticides should be arranged as far as possible if necessary. Spraying during the day should be preceded by warning signs to avoid accidents. The pesticide application personnel should strictly follow the operating procedures, regulate the work, wear protective clothing, gloves, goggles, masks, protective covers and so on. Different types or varieties of flowers, trees, and flowers and trees have different levels of sensitivity to chemicals at different stages of development. For example, dichlorvos is a highly effective and low-toxic insecticide suitable for gardens, flowers, fruit trees, etc., but it is prone to phytotoxicity to plums, apricots, cherry blossoms, prunus triloba, taro and some flower plants, and should not be used or concentrated. Do not be too big. Seedlings and saplings promote the use of water and powder and try not to use highly toxic emulsifiable concentrates. Fifth, the correct mix of drugs Two or more pesticides can expand the scope of control, improve drug efficacy, overcome or delay pest resistance, reduce the amount of pesticides and application times, improve work efficiency. However, mixing must be scientific and not mixed. Acidic and alkaline chemicals cannot be mixed. For example, sulphur-containing fungicides (Sulfur, Mancozeb, Fumei Shuang, Tuzi et al.) cannot be mixed with copper preparations. Some pesticides can not only not be mixed, but also have a certain time interval. If you do not use mancozebite within 20 days of using Bordeaux mixture, use Bordeaux mixture at intervals of 15 to 20 days in the place where you have used lime sulfur. If the pesticide mixture is stratified, precipitated or has increased toxicity, it cannot be mixed. China Agricultural Network Editor
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