At present, most rural households in the Beijing suburbs still use pesticides to control vegetable pests and diseases, and when using pesticides, problems such as unsatisfactory control effectiveness and occurrence of phytotoxicity will occur. Therefore, farmers' friends must not only understand the basic nature of pesticides, but also have some skills in using drugs in order to achieve scientific and rational use of pesticides, to fundamentally exert the maximum effectiveness of pesticides, and reduce the impact of pesticides on crops, the environment and the ecology. Symptomatic drug selection The so-called symptomatic, first of all to identify crop pests and diseases, especially diseases, to distinguish between infective diseases and non-invasive diseases, distinguish between bacterial diseases and fungal diseases and so on. In recent years, investigations have found that non-invasive diseases in protected vegetable fields account for a large proportion. The occurrence of non-invasive diseases can not be prevented by the use of pharmaceuticals, and measures can be taken to adjust the temperature and humidity and control the amount of water and fertilizer. If you do not know whether it is a disease, be sure to consult local technical personnel, and then take appropriate control measures, and avoid blindly using drugs. Once the use of pesticides is not symptomatic, on the one hand it fails to achieve the desired control effect; on the other hand, it delays the optimal period for prevention and treatment. Do not mix pesticides Mixed use is divided into two types: one is to mix the same type of control agent for the same control object; the other is to mix different types of control object or to play a different role, which also includes the mixture with the foliar fertilizer and growth regulator. First of all, for the same object of control, the use of two or more agents with the same kind of effects is not recommended. One is to increase the cost, and the other is that the efficacy cannot be guaranteed. For the mixed use of different agents, the combination of three or more pesticides (including foliar fertilizers and growth regulators) is not recommended, especially if the chemical nature of the pesticide is not known. The reaction of pesticides in water is divided into acidic, alkaline and neutral. When mixing, it is also necessary to pay attention to: acidic pesticides can be mixed use, neutral pesticides can be mixed, alkaline pesticides can not be mixed, neutral pesticides and alkaline pesticides can be mixed, acidic pesticides and alkaline pesticides can not be mixed. Therefore, if you do not know the nature of the pesticide after it reacts in water, do not use it blindly. Accurate dispensing and application 1 drug and media mix. In the case of a method of mixing a drug with water by spraying, irrigating or pouring, a secondary dilution method is advocated. First, dissolve the drug with a small amount of water to prepare a mother liquor, then add some water to the container of the medicated device or other filling liquid, then pour it into the mother liquor, and finally add water to the required amount to fully mix the medicine with water. Mixing; When using pesticide soil treatment, should first mix the agent (granules or powder) and soil (fine sand or sandy loam soil) and then mix thoroughly. The amount of mixed soil is determined according to the area of ​​application and the habits of medication, and the purpose is to apply the pesticide uniformly. 2 dosage. When dispensing, it must be diluted according to the instructions on the pesticide package. There are two kinds of dilution: one is the dilution of liquid; one is the amount of mu is. The liquid can be divided by the total amount of liquid required to be divided by the required dilution, that is, the amount of the original drug used; according to the amount of use to estimate the total amount of water used to prepare the liquid. 3 Scientific application of pesticides. It is necessary to apply according to the instructions. Do not blindly increase the dosage and avoid the occurrence of phytotoxicity. Take a backpack-type manual sprayer as an example. The speed of the walking, whether or not the two sides of the blade are sprayed, and whether or not the focus is applied will affect the effect of the spraying. 4 daily maintenance of equipment. Take the backpack-type manual sprayer as an example, the wearing parts such as pressure tanks and spray cores should be checked at any time and replaced in time. Such as the core, the normal should be spray, if there is a phenomenon such as spray droplets and other poor, you should promptly replace the core. If the spray core is not well atomized, there will be a phenomenon that the chemical liquid is deposited on the leaves. If the liquid concentration is high, it is prone to phytotoxicity. Application time is scientific Application time is on the one hand for the early, middle and late of the day; on the other hand, it is for the occurrence of crop pests (early, middle and late). First of all, it should be applied on sunny days (mainly for spraying). If it is necessary to apply on cloudy days (refer to protective sites), smokers can choose to use smoked sheds or dusting methods. In the middle of the day, try to use sunny mornings to apply pesticides. Remember to refrain from applying pesticides at noon on sunny days. The first is that the pesticides are easily decomposed at high temperatures and the efficacy is reduced; second, the personal safety of the pesticide application personnel is not guaranteed and poisoning accidents are prone to occur. In addition to following the above, the protection site should also pay attention to: In the early spring, after the curtains are opened in the morning or after the insulation is removed, it is better to apply the pesticide after the dew retreats. If the pesticide is applied in the afternoon (no wind weather), be sure to open the tuyere and wait for the liquid to dry before closing the tuyere. In addition, melons and fruits in the fruit setting, fruit expansion and application of foliar fertilizer need to be careful, such crops are more sensitive and easy to produce phytotoxicity. Disposable Cap,Disposable Non Woven Eco-Friendly Cap,Medical Breathable Stip Hat,Protective Isolation Disposable Cap Shaoxing Weijian Medical Supplies Co.,Ltd. , https://www.wetourmedical.com