Resistance to flowers and trees pests and its control measures

In the prevention and control of pests and diseases, such a phenomenon often occurs: a pesticide is continuously and repeatedly used on the same pest, and after a period of time, the efficacy will be significantly reduced or even invalid. For example: 1605 is the earliest popularized variety of organophosphate insecticides. When used initially, they prevent and control pests such as spider mites and aphids. The dilution factor is more than 5,000 times. Now it is often impossible to control them with 1000 times. Another example: 666 is a commonly used pesticide in China's agricultural production in the 1950s and 1960s. At that time, the variety of pesticides was relatively single. In daily life, people sometimes use it to control lice and fleas. In the early days of use, where there were lice, the sixty-six pink powder was scattered. A few years later, I grabbed a wolfberry and put it into 666 powder, just like it was in flour. I didn't like it. People often complain that the quality of today's pesticides is getting worse. In actual fact, this is mainly the result of pest resistance.
First, pest resistance is a biological instinct against harsh environments. In an environment that is constantly subject to pesticide attacks, organisms also have a resistance response. This reaction is even stronger when the same agent is repeatedly used repeatedly. The survival of the fittest, any biological population, there are always some individuals sensitive to drugs, some insensitive. After organisms come into contact with pesticides, susceptible individuals are susceptible to poisoning. Insensitive individuals survive and continue to breed, resulting in insensitive drug-resistant populations. Resistance to pests has a weak to strong process. In order to enhance their defensive capabilities, pests and diseases are constantly building their own bastions, such as changing the permeability of the epidermis of organisms and resisting the attack of pesticides. Some pests can also produce an enzyme that can make the decomposition of pesticides ineffective.
Second, control measures Prevention and control of pests and diseases like snoring, pesticides is a powerful weapon to eliminate pests and diseases. With the development of science, new pesticides have been introduced. From the dosage form, there are powders, granules, creams, liquids, mists, and the like. According to the use of points, there are spray, dusting, spraying and so on. However, weapons alone are not enough and there must be a set of scientific countermeasures. To realize the intractability of pests and diseases, we must strategically despise it and attach importance to it tactically.
1. Rotational Drugs In order to prevent the occurrence of insecticide resistance, pesticides with different mechanisms of action should be selected as much as possible and rotated and used alternately.
2, mixed drug choice Two or more different drugs used in combination, the implementation of joint defense. Note: All kinds of pesticides can not be mixed blindly. After some pesticides are compounded, chemical reactions may occur, or the efficacy may be reduced, or the phytotoxicity may be caused to the flowers and trees. Moreover, the long-term use of a single compounded pesticide also tends to make the pest resistant.
3, increase the spray density Spraying again after a drug, we must promptly observe the insect mouth density, if there is leakage of the net, it should be followed by another spray, take advantage of chase, do not give the disease a chance to wheezing, cut off the formation process of its drug-resistant population. If the spraying interval is too long, the surviving pests may spread and form a "pity of the prairie fire."
4. Increasing the spray concentration Increasing spray concentration is a commonly used measure in pest control. As the pest resistance increases, so does the spray concentration. However, everything has a certain degree. If it exceeds this degree, it will undergo a qualitative change. The tolerance of flowers and trees to the concentration of pharmaceuticals will also have a one-degree problem. If the concentration exceeds a certain concentration, phytotoxicity will occur. Therefore, we must correctly understand the toxicity of pesticides, scientific use, strictly based on the use of pesticide instructions, to increase the concentration within the allowable range.

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