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There is no symptomatic medication. When purchasing and using pesticides, it is necessary to look at the instructions for use of pesticides and choose medications according to different pests and different stages of occurrence. Many farmers often diagnose mistakes, some treat diseases as insects, and treat them as doctors. The result is counterproductive. Although some pests and diseases are clearly separated, the medication is not correct, and some farmers use insecticidal doubles to treat the disease, which of course does not achieve the expected control effect.
Did not grasp the control period. Crops are not sensitive to pesticides at different growth stages. For example, He Da Zhuang can be used for weeding in paddy fields, but it cannot be used before the second leaf stage of Putian. The appropriate period of pest control is also related to the characteristics of pesticides.
Did not master the correct method of application and concentration. For example, herbicides should only be sprayed and not repeated. If they are applied by mist or repeated many times, they will often cause phytotoxicity. Some pesticides such as paclobutrazol can only be used 1?/FONT>2 times a year. If applied repeatedly, it will accumulate in the soil and affect the growth of crops in the next season and next year. Some farmers did not apply the pesticide to the vital parts when using the medicine. Many farmers use bottle caps to estimate or even use the bottle to pour, so that the concentration of the liquid is too high, which wastes pesticides and easily causes phytotoxicity.
There is no reasonable mixing and compounding of pesticides. Scientific compounding of pesticides can achieve twice the result with half the effort. However, some farmers disregard the physical and chemical properties of pesticides and the high level of toxicity. They can mix and match several pesticides at will, which is very easy to cause losses. The drugs with the same function generally do not need to be compounded. After the pesticides are mixed, it is not suitable for long-term release. It must be used now. Otherwise, it is not a reduction in control effect, that is, pesticide poisoning.
Did not pay attention to the environmental conditions during the application period. Generally, you should choose to fight drugs in good weather. It is not advisable to fight drugs when the dew is not dry. Summer is hot and should be used in the morning and evening. Some pesticides have certain requirements on the environment, especially herbicides should pay more attention. If the field is sprayed with butachlor, the rice is prone to phytotoxicity when the temperature is above 35 °C, and it is safe to apply at around 25 °C.
Apply a method to avoid loss
In recent years, the author's investigation in rural areas found that the phenomenon of improper use of large-scale phytotoxicity has occurred from time to time, which wastes pesticides and increases costs. The main reasons for these problems are:
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