The use of pesticides is the most commonly used method to control pests and diseases. In the process of pesticide use, farmers often report poor efficacy. There are also some “good medicines†with complete three-certification, new ingredients, sufficient content and new dosage forms. The “fake medicine†hat has been buckled, and there are not many pesticides that have been smashed. Through understanding, the factors affecting the efficacy of pesticides involve many aspects.
Reasons for poor pesticide efficacy: pesticides affect their effects
The composition, physicochemical properties and dosage forms of pesticides all affect the efficacy of the drug. There are differences between the different dosage forms of the same ingredients. The production process and the production capacity of each company are different, and the efficacy will be different. Exclude some companies to make a fuss about the content, stealing the content affects the efficacy.
Reasons for poor pesticide efficacy 2: Inaccurate diagnosis of disease, deviation of medication
At present, the diagnosis of diseases relies mostly on the experience of dealers and farmers. Because of the amount of experience, things that confuse fungal diseases and bacterial diseases sometimes occur. When fungi and bacterial diseases are mixed, many farmers are blindly identified as fungal or bacterial diseases, and a single agent is used for prevention and treatment. This diagnosis and treatment is extremely easy to miss the best prevention and treatment period of the disease, causing some pesticides to fail to meet the expectations of farmers. The effect of multi-effect medicine, medicine to disease, will produce poor efficacy.
Reasons for poor pesticide efficacy: Spray quality affects efficacy
The quality of the spray directly affects the level of efficacy. At present, in some places, conventional spray equipment is used, and the sprayed droplets are too large. When the mist falls on the surface of the crop, it will bounce. About 50% of the liquid falls on the ground, and the effect cannot be fully exerted. If the diameter of the droplets is reduced by half in the same amount of liquid, the number of droplets obtained can be increased by 8 times, and the efficacy is also greatly improved.
Many farmers worry that the liquid can not be completely stained on the surface of the crop, so they will increase the water consumption. This will not improve the efficacy and reduce the efficacy. Because the drops of the leaves on the surface of the crop leaves are limited, when the spray amount exceeds a certain limit, the fine droplets on the leaves will gather into the large droplets to reduce the amount of pesticide on the leaves.
In order to improve the quality of the spray, it is necessary to improve the existing spray equipment, reduce the aperture of the spray, reduce the diameter of the spray, and maintain a distance of more than 20 cm between the spray and the crop during spraying to form a good atomization effect, while spraying. The addition of silicone spray auxiliaries can reduce the surface tension of the liquid and reduce the loss of the liquid due to bounce, especially in crops with thick waxy layers.
Reasons for poor pesticide efficacy: Seeing medicine, treating and curing
For the prevention and control of crop diseases, the common practice of many farmers is to "seek disease, re-treatment and light prevention". Some farmers said that in order to treat the disease, there are many "special effects" for the single agent of dimethomorph, metalaxyl and cymoxanil, and these drugs are used for prevention and treatment before the disease occurs. The above varieties. This kind of "active attack" disease prevention and control method is widespread in many places.
Once the drug effect is found to be reduced, the dosage is increased. The long-term use of a certain agent alone will inevitably lead to premature resistance of the pathogen, and will face a situation of no cure when the disease is outbreak. We should change the existing concept of prevention and control, adhere to the principle of “prevention first, comprehensive prevention and controlâ€, scientifically select pesticide varieties, and avoid mixing of various preparations of the same active ingredient. It is recommended to rotate the use of different ingredients and mix with protective preparations to delay The occurrence of resistance.
Reasons for poor pesticide efficacy: Misunderstanding of pesticide compounding
At present, farmers hope to solve all the pest problems once and for all, and often mix pesticides of different types and different dosage forms, and there are many problems.
First, there is a misunderstanding of the second dilution. The correct way is to dilute several pesticides to be used separately. After diluting one kind, pour into the nebulizer and dilute the next one, and then proceed in order, so that the role of secondary dilution in improving the effect can be truly exerted.
Second, the order of administration of different dosage forms in the mixing process affects the efficacy of the drug. The medicine and fertilizer are foliar fertilizer , wettable powder, water-dispersible granules, suspending agent, microemulsion, water emulsion, water agent and emulsifiable concentrate, so that the mixed agent has good stability.
Third, the pH of the drug affects the efficacy of the drug. Improper compounding is prone to acid-base neutralization. For example, copper preparations with a large proportion of bacterial diseases can be discolored and precipitated when mixed with other chemicals. The efficacy of the lighter will be weakened, and the serious ones may cause phytotoxicity.
Reasons for poor pesticide efficacy 6: Temperature and humidity affect the efficacy of the drug
Humidity and temperature will affect the efficacy of the drug. For example, when the dew is not dry, the dew will dilute the concentration of the solution. If the temperature is too high or too low, it will affect the effect of the drug. Generally speaking, the temperature is better in the range of 20 °C ~ 30 °C.
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