Many vegetable farmers report that their own vegetables are often phytotoxic. What is going on? When using pesticides, we must pay attention to it, don't abuse it, otherwise it will be counterproductive. The following are the precautions for the use of vegetables in greenhouses, welcome to read!
Precautions for the use of vegetable greenhouses:
First, choose a reasonable medication time. During the daytime, the temperature is high, the water evaporates quickly, and the concentration of the drug solution tends to increase after spraying. Especially at noon, the risk is very high. We should choose to take the medicine before 10 am or after 16:00 to reduce the occurrence of phytotoxicity. In addition, always pay attention to the weather changes, 1-2 days in advance of the rainy weather.
Second, the pharmacy mix should be reasonable. At this stage, due to the high temperature, it is a high incidence of viral diseases and various pests. It requires a variety of chemicals to prevent and control. In addition, it is time-consuming and labor-intensive to spray, so many vegetable farmers mix and add a variety of drugs each time, so that they are different. A chemical reaction occurs between the agents, which not only fails to achieve the control effect, but also causes the occurrence of phytotoxicity.
It is recommended that vegetable farmers should understand the physical and chemical properties of different kinds of pesticides, and do not blindly mix them. For example, insecticides and copper preparations should not be used together with foliar fertilizers, and foliar fertilizers have better single-spraying effects. It is necessary to be targeted when spraying, and to prevent and cure the most serious diseases.
Finally, don't increase the amount of medication. Because the bacteria will produce drug resistance, after the same drug is used repeatedly, the control effect will be greatly reduced, so some vegetable farmers will increase the dosage to enhance the drug effect, which is exactly the opposite. Moreover, most of the current greenhouse vegetables are in the seedling stage, and the plants have poor drug resistance and are easy to be harmed by traditional Chinese medicine. Therefore, it is recommended here that vegetable farmers should choose different drug rotations for prevention and treatment of the same kind of diseases. Each drug can not be used continuously for more than 3 times, which can avoid the resistance of the bacteria and prevent the occurrence of phytotoxicity, and can achieve good prevention and treatment. effect.
How to prevent the occurrence of vegetable phytotoxicity
After the phytotoxicity of vegetables, the vegetable farmers must be relieved in time. Once the best opportunity is missed, it will seriously affect the normal production of vegetables. At the same time, in management, we must create an operation to slow down the metabolic activity of vegetables, and avoid the rapid absorption of liquid medicine by plants. Specifically, it should be done in the following three aspects:
First, selectively remove the leaves with severe phytotoxicity and reduce the absorption of the drug solution. At present, most of the fungicides and insecticides are systemic except for protective agents such as chlorothalonil, copper preparations, and mancozeb. In particular, when it is used to control pests, it is mainly based on systemic drugs. Therefore, after the occurrence of phytotoxicity, it is necessary to take care to remove the severely damaged parts, to prevent the plants from continuing to absorb the medicinal agents and to increase the degree of damage to the plants. For example, cucumber cultivation, in order to develop and yield, pay attention to moderate when removing leaves, do not over-pick leaves.
Secondly, spray + watering the water to reduce the amount of leaf liquid and promote plant recovery. After the phytotoxicity occurs, it is necessary to pay attention to spraying the water immediately, cleaning the leaves, reducing the amount of liquid on the leaves, avoiding the continued absorption of the leaves and aggravating the damage.
In addition, it is necessary to pay attention to timely watering the plants, improve the growth of the plants, promote the normal growth of the plants as soon as possible, and reduce the phytotoxicity of the plants.
Finally, the leaf surface is sprayed with a palliative agent in time. The use of professional phytotoxicity mitigating agents can quickly alleviate the occurrence of phytotoxicity and promote the good development of plants.
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