To prevent and control garden plant pests, chemical agents such as insecticides, fungicides, and herbicides are required. Improper use of chemical agents can cause harm to garden plants. If the chemical is used, the growth of plants will be hindered, and if it is heavy, the plants will become partially necrotic or the whole plant will die. In order to reduce the harmful effects of garden plants, on the one hand, scientific drugs should be used to prevent the occurrence of phytotoxicity as much as possible. On the other hand, it is necessary to do a good job of investigation after the use of drugs and timely treat the injured plants.
Phytotoxicity prevention measures
Use chemical agents as little as possible: Continuously strengthen biological control, give full play to the control of natural enemies in the natural world, and introduce the development of natural enemies that can be commercially produced.
The correct selection of pharmaceutical varieties: In the selection of pharmaceutical varieties, the main killing effect should be changed to the smaller damage. Try to use pesticides that are low in toxicity, fast in decomposition, less in pollution, lighter in phytotoxicity and safe to the environment, such as some mineral pesticides, plant pesticides, etc.
The correct choice of pharmaceutical dosage form: whether it is to pursue the role of killing, or from the perspective of reducing the harm of the drug, the water solvent is better than the powder, and the oil spray applied to the crown is the best. If you combine the selective formulation and improved usage, the effect will be better.
Correctly master the amount of medicine: When formulating pesticides, strictly follow the instructions and accurately weigh. The number of pesticides to be applied shall be based on the occurrence of pests and the duration of their persistence within the tolerance of the plants.
According to the situation of plants, different garden plants have different endurance to different pesticides. The application of pesticides should be carried out in a good period of time, based on the regularity or short-term forecast of the occurrence of pests and diseases. Different developmental stages of plants have different resistance to pesticides. Germination stage, seedling stage, anthesis stage, booting stage and young fruit stage are more sensitive to drugs. To prevent phytotoxicity, the pesticide concentration should be appropriately reduced.
According to the climatic conditions of medication: application of drugs under adverse climatic conditions such as high temperature, high humidity, strong light, strong wind, etc., it is very easy to cause phytotoxicity. Insecticides and fungicides are applied in sunny mornings or in the afternoon, and closed herbicides are effective before or during raining.
Drug treatment measures
Increasing fertilizing water: For the phytotoxicity caused by contact herbicides, insecticides, bactericides, such as local spot, leaf margin scorch, and plant yellowing, the application of organic or chemical fertilizers can be used to increase the compensation for plant regeneration. . If grass seedling grass seedlings appear chloroauron injury, follow-up application of human organic fertilizer such as manure, cake fertilizer, or spraying urea, potassium dihydrogen phosphate and other fertilizers.
Irrigation and immersion soaking: For pesticides, fungicides, and herbicides applied by soil treatment methods, phytotoxicity caused by over-application or improper application may be used for ploughing and drying green soil, soaking in water, and repeated washing. As much as possible to dilute the concentration of the liquid in the soil, reduce the residual amount of the pesticide in the soil, reduce the pesticide damage to the plant roots. If excessive spraying of leaves causes phytotoxicity, the leaves of damaged plants can be quickly sprayed with a large amount of clean water when the early liquid has not been completely penetrated or absorbed.
Spraying Growth Hormone: For the phytotoxicity caused by some growth regulators and conductive herbicides such as alachlor, ethephon, and rhubarb etc., gibberellin and foliar osmotic etc. can be sprayed to reduce the degree of phytotoxicity.
The use of antidote or adsorbent: some drugs can be used and the opposite of the nature of drug neutralization, but also through the use of antidote or adsorbent remedies, such as spray lime water, calcium polysulfide and other methods to prevent or reduce injury .
Selection or breeding of resistant varieties: Through the action of drug-resistant plants, it can also effectively reduce the number of phytotoxicity or reduce the victim's degree of harm.
Removal of victimized tissue: The timely removal of damaged flowers, fruits, branches, leaves, etc., can prevent the spread of the agent in the victim plant.
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