Pollution-free strawberry production using pesticide technology

The so-called pollution-free strawberries require that the fresh fruit be clean, fresh, sweet and sour, and that the toxic and harmful substances content is lower than the human standard for safe food and should meet the double standards of nutrition and medicine. Under the present conditions, the production of pollution-free strawberries is inseparable from chemical pesticides. However, the principle of “strict, accurate, and appropriate” must be followed during use. I. Strictly selecting pesticides and strictly implementing pesticide safety intervals The five pesticides used in the production of pesticides should be strictly screened, using biological pesticides as priority, and selectively using high-efficiency, low-toxicity, low-residue chemical pesticides. These pesticides mainly include: insecticides: Bt series, avermectin series, pyrethrins, plant extracts (such as bitter lactone, capsaicin, etc.), insect hormones (Miman, Kasik, and Titan ), A small number of organophosphorus pesticides (trichlorfon, lasben, farmland) and other pesticides such as imidacloprid; fungicides: Bordeaux mixture, oxo-qing, thiophanate-methyl, shigao, Fuxing, can kill, Chlorothalonil, Tetramethacin, Baccarat, Pyrimethanil, etc.; Herbicides: Herborium, Gazao, etc.; Aerosols: Sulphur Fumigant, Acryloxacin, Extermination Smoke, etc. In the entire production process of strawberry, the use of methamidophos, carbofuran, insecticidal guanidine, omethoate, dicofol, methyl 1605, sodium pentachlorophenol, Kedandan, chloropicrin, and herbicidal ether are highly strictly prohibited. Residue pesticides. The amount of pesticide residues in fresh strawberries was closely related to the length of time from the last application to harvest time. Shorter intervals will result in more pesticide residues, and vice versa. Therefore, producers must strictly control the safety intervals of various pesticides. Generally, it takes about 10 days before the strawberry is harvested or after it is harvested. The pesticides such as imidacloprid, which have a long residual effect, should be collected and marketed more than 15 days after use. Second, pay attention to prevention and control strategies and accurately grasp the appropriate period of prevention and treatment of any pests and diseases in the field have a certain degree of development, according to the law of disease and insect pests, pay attention to prevention and control strategies, accurately grasp the appropriate control, accurate selection of suitable pesticides, have a multiplier effect effect. Prevention of pests such as Spodoptera litura and other moth pests should master the principle of “governance and stress 2 ”, that is, prevention and control of the first generation to depress the second generation of the pest base, and should be controlled during the evening, because they hide in the ground during the day and the pesticide application has almost no effect. In the evening when it comes out of crops when the crop is harmed, the control effect is significant. Prevention and control of red spiders should be in the stage of spotting. Strawberry virus disease is closely related to locusts. As long as locust control is effective, the incidence of viral diseases can be significantly reduced. At the same time, according to the occurrence of pests and diseases in the field, it is very important to accurately select the method of pesticide application. If it can never be ruled, it can never be treated universally. Non-pollution strawberry production should minimize the use of drugs, apply the least drugs, and achieve the best control effect. Third, appropriate, alternating and scientific use of drugs is an important means of scientific drug use. In some producers, there are some misunderstandings in the use of medicines. The more medicines are used, the better the insecticidal or curative effects are. Some farmer households use one-to-two times the prescribed amount of drugs, which not only increases the cost, but also causes phytotoxicity, while the control effect does not increase and will have a great negative effect. Therefore, what kind of diseases and pests, what medicine to use, and how much dose should be used should be strictly controlled. Pesticides must be used alternately to enhance efficacy and delay pest resistance. Some Raspberry farmers like to use a pesticide repeatedly when it is used, which will lead to the gradual formation of resistance to the disease and insect pests, so that the effect of chemical control will gradually decline. One of the effective ways to overcome and delay drug resistance is to use two or more pesticides with different mechanisms of action alternately, and care should be taken to choose alternate agents that do not have cross-resistance. If an insecticide has become resistant, you can stop using it for several years and then activate it. If mixed pesticides are to be used, they should be used immediately. The mixture must be checked before use. For example, mancozeb may be mixed with trichlorfon and dichlorvos, but not with Bordeaux mixture and limestone. Mixtures and other mix. China Agricultural Network Editor

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