When growers use pesticides to control pests and weeds, they often have poor control. In the case of unexplained reasons and failure to obtain proper guidance, they often increase the dosage, concentration, frequency and repeated use of drugs, and even use highly toxic pesticides and other banned pesticides in order to achieve better control effect. This will not only increase the user's drug costs and labor costs, but also put pressure on our agricultural food safety, environmental protection and sustainable agriculture.
Improper use of liquid dosage
The amount of application liquid refers to the amount of liquid sprayed on the farmland per unit area. China's current conventional spray is mainly based on high-volume method and medium-volume method. It has a large amount of water and can be uniformly wetted. However, the liquid that is actually held on the target site or on the crop surface is less, and the liquid is wasted and lost. Modern agriculture needs the concept of modern plant protection. We also need to choose the right amount of water according to local conditions. If necessary, we also need to add suitable spray Additives (such as silicones, mineral oils, vegetable oils), spray equipment (spray nozzles), and pesticides. The formulation can be used in matching to increase the retention of the drug solution on the target site or on the surface of the crop, and to promote stable drug efficacy.
Improper mixing of medicaments
In general, the use of two or more agents with different modes of action and mechanisms may not only improve the control and treatment effects of pests and weeds, but also prevent or delay the development of pest resistance. However, pesticides must be mixed to understand the nature of the various types of pesticides, the role and the object of prevention and control, scientific and rational mix of mixed use, and can not be mixed with indiscriminate use, otherwise it may not only fail to prevent and control purposes, and may even have serious adverse consequences. In addition, when pesticide preparations are used in combination, care must be taken to mix the methods (such as the mother liquor method or the secondary dilution method) and the mixing sequence, and clean water should be used as much as possible.
Increased target resistance
In recent years, the resistance of insects and weeds has become increasingly acute. This has also put forward more accurate requirements for the use of pesticides and the concentration of pesticides used. The use of pesticides or the use of excessive concentrations is prone to phytotoxicity and more residues, the use of pesticides or the use of pesticides. If the concentration is too small, reasonable control effects cannot be achieved. For the important pests and weeds that are frequently used for drugs, their resistance to drugs is often several times, several times, or even hundreds of times more. This will bring many difficulties and challenges to plant protection work. Therefore, when the target resistance increases, how to match the appropriate amount of pesticide is also a practical plant protection technology problem.
Inappropriate timing
Plant protection control must grasp and grasp the optimal timing of the target. Even with the same pests and weeds, the response to the same pesticide is not the same due to the different stages of development. If you miss the best opportunity for prevention and control, it will be very difficult to achieve good control effects with a large amount of use. Therefore, only by fully understanding the occurrence, harm, and development laws of pests and weeds can be accurately targeted at the most appropriate time to ensure good control. For example, some weeds are easier to control before and after the 3-leaf stage, and some weeds have a good control effect during the vigorous growth stage; it is necessary to prevent and control the pests of rice aphid pests at the peak of the hatching of eggs, and it is best to control insects such as cabbage butterfly and leaf roller moth. Morning spray control; prevention and control of Lepidoptera noctuidae and some of the moth family pests, the best evening spray control.
Non-symptomatic prevention
Different pests and weeds require different pesticides for control. If the diagnosis of pests and weeds occurs again, symptomatic prevention and control becomes empty talk. In practice, diseases are confused, insect pests are confused, diseases are treated as pests, pests are killed, and grasses are used as pests. Such as wilt disease confused with Verticillium wilt; leaf mold and gray mold disease confused; early fruit tree defoliation, cotton red leaf dead disease misdiagnosed as red spider; tomato wilt disease caused by dead seedlings, misdiagnosed as root rot or soil pests Root bite caused dead seedlings; soy field weed grass dodder harm mistakenly treated as root-knot nematode disease.
Biochemical industry
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