1. Characteristics of methamidophos Methamidophos is a highly toxic organophosphate insecticide. A colorless or light yellow viscous liquid with a strong odor. It can be dissolved in water, stable under neutral and weak acid conditions, and is not easy to decompose. On the contrary, it is easy to decompose and fail. Methamidophos is relatively stable at room temperature and will decompose at high temperatures for a long time. Iron will accelerate its decomposition, and this pesticide also has a corrosive effect on metals. The main characteristics of methamidophos are as follows: 1 Wide range of insecticides It has a wide range of insecticidal effects, and has good control effects on many pests such as aphids, planthoppers, leafhoppers and aphids, and red spiders. 2 There are a variety of insecticidal effects. Methamidophos has strong contact and stomach toxicity to pests and red spiders. Whether the pests are in contact with the medicament or eat the stems and leaf tissues with the medicament, they will quickly poison and die. It also has a certain systemic action, which can be absorbed by plants through roots, stems, etc., and transmitted to all parts of the whole plant. When the pests are eaten, they will also be poisoned and die. 3 It has strong insecticidal power and has strong insecticidal power against pests and mites. With a small dose, the ideal control effect can be achieved. In particular, methamidophos is used to control pests that have developed resistance to other pesticides and has a good insecticidal effect. 4 A longer period of efficacy generally lasts for 7-10 days. The length of the efficacy period varies with the subject and dosage. 5 People and animals are highly toxic, so all aspects of the use of the pesticide should be safe. 2. Characteristics of Omethoate Omethoate is also known as omethoate. It is an organophosphate insecticide synthesized by the factory based on the principle that the dimethoate is oxidized and metabolized in the living body and is a compound with greater virulence and toxicity than dimethoate. The original drug is an oily liquid with a strong smell of onion and garlic. It is soluble in water, but the stability of the aqueous solution is worse than that of dimethoate and it is easier to decompose and fail. Omethoate is relatively stable in neutral and acidic solutions, but decomposes quickly under alkaline conditions. Omethoate has a strong contact effect on pests and mites, especially for some aphids that have developed resistance to dimethoate. Omethoate also has a strong systemic insecticidal effect. It can be sucked into the body by the stems and leaves of the plant, and can be transported to the drug solution without being sprayed to the poisonous part. Therefore, when using omethoate, the method of applying a stem can be applied. Under normal circumstances, the temperature has little effect on the efficacy of omethoate. Omethoate is a highly toxic pesticide, but it does not easily penetrate into the human body from the skin. The toxicity of contact with Dimethoate is not significant. 3. The characteristics of carbendazim and the preventable disease. Carbendazim is a wide range of bacteriostatic. A systemic fungicide that has a good inhibitory effect on many fungi that cause crop diseases. Carbendazim can inhibit the growth of germ cells, aspirator or hyphae, making it deformed, and carbendazim has little inhibition on the germination of pathogen spores. Carbendazim has a certain systemic capacity, which can be absorbed by the roots of plants, and is transported to the stems or leaves along with the water and nutrients, but the other parts of the plant can not be transported to other unsprayed drugs. The part. Carbendazim is mainly a preventive effect on the disease. It can prevent the pathogen from invading the tissue of the plant and alleviate the occurrence of the disease, but has no treatment and eradication effect on the pathogen in the tissue in which the disease has occurred. Therefore, the use of carbendazim to control diseases must be collected before the germs are heavily infested. Carbendazim is a specific drug for the control of scab. It is not effective against bacteria and downy mildew. 4, the characteristics of Daisen zinc and the use of Daisen zinc is a low-toxic pesticide. The pure product is off-white crystal, and the heat is decomposed before the melting point. The original drug is white or light yellow powder, insoluble in water, and can accelerate decomposition in alkaline medium or copper salt. Commercially available dosage forms are typically 65% ​​or 80% wettable powders. The pesticide has a control effect on various diseases. Dyson zinc is applied in the early stage of the disease by foliar spray method. Spray the plant surface evenly when spraying, and repeat the application every 7-10 days if necessary. The dilution ratio of the 65% dosage form is 300-500 times; the 80% dosage form is 400-600 times. This pesticide should not be used with alkaline drugs and copper-containing agents. 5. Preparation and use of Bordeaux mixture Bordeaux mixture is an important fungicide for controlling plant diseases such as fruit trees and garden flowers. Bordeaux mixture is usually prepared by itself. The types of plants to be sprayed and the sterilization requirements are different, and the ratio of raw materials is also different. In terms of the amount of lime used, there are multiples, half-quantities, equal amounts, and the like. The preparation method is to take two containers, one copper sulfate with 80% water content, one lime with 20% water content, pour the copper sulfate liquid into the lime milk, and stir with a stick while pouring. It becomes a sky blue Bordeaux mixture. Bordeaux mixture is a better protective fungicide. It has control effects on various diseases such as powdery mildew, gray mold, spot disease, anthracnose, black spot and rust on flowers. It can not be stored with the use; it can be prepared according to the concentration used, once it is well prepared, and the prepared liquid can not be diluted with water; it can not be mixed with stone sulfur agent, petroleum emulsion, etc.; the liquid has corrosive effect on metal, after each use , rinse the spray device clean. 6, the use of herbicides herbicides are a type of chemical used to kill weeds, but the herbicides are different from the herb, and the impact on different crops is also different. Therefore, to use the herbicide must be "three look." Look at the grass, and do the right medicine. Different weeds have different sensitivity to herbicides due to their differences in morphology, structure and physiology. When using drugs, it is necessary to look at the grasses in the field and determine the reasonable combination of herbicide types in order to receive satisfactory results. . Second, as a thing, to achieve safe use. Because different crops have different ability to absorb, conduct and decompose different herbicides. When using the medicine, it is necessary to look at the stage of growth of the field crop, and use appropriate herbicides to both weed and protect the seedlings. Third, look at the pharmacy and be flexible. Because the characteristics of different herbicides are different, it is necessary to understand its chemical characteristics, content, herbicidal methods, and applicable crops and control objects. It is safe, economical and effective to master the rational use of technology and strictly control the dosage. 7, the characteristics of chlorpyrifos chlorpyrifos is a systemic excellent herbicide. The product is 50% emulsifiable concentrate, which is a light yellow transparent oily liquid with a special bead odor; also has 10% granules, which are light yellow granules. It can prevent annual weeds such as valerian, sedge, water leek and ragweed. Its herbicidal characteristics are absorbed by weed shoots and young roots, inhibiting protein synthesis and stopping weed growth until death. Its efficacy is relatively stable, affected by temperature and rain, and the effective period can be up to 1 month. 8. Characteristics of herbicidal ether Herbicidal is a contact herbicide with a wide range of crops. The product is a 25% wettable powder, which is brown and has a special odor. It can be stored for about 2 years under normal conditions. Herbicidal ether is more effective against sedges and some broadleaf weeds, but has a poor effect on perennial weeds. It is characterized by the formation of a drug layer on the soil surface, the weed shoots are exposed to the drug layer, and the grass killing effect is exerted after the light is seen, and the weed damage to the seedlings is small. Therefore, it should generally be used for pre-emergence treatment of weeds. It is not advisable to move the soil after application to avoid damage to the drug layer and reduce the efficacy. When the steam temperature is low, its effect is poor. The validity period is about 20 days. 9, glyphosate characteristics and the use of glyphosate, also known as Zhen Cao Ning, is a non-selective herbicide for stem and leaf suction. The product is 10% liquid, brown. Glyphosate is easily decomposed in soil and has no killing effect on weed seeds without germination. It has poor selection of crops, but it can be used for directional sprays such as nursery, woodland, etc., mainly to prevent perennial malignant weeds such as fragrant aconite, white mulberry, scutellaria, beetroot and reed. After the stem and leaf are sprayed, it can be absorbed by the weed leaves, and the agent is transported to the underground rhizome, which interferes with and hinders the metabolic activity of the protein, causes the weed stems and leaves to gradually die, and the growth point of the underground rhizome stops growing and dies. . During the growth of perennial weeds, 10% glyphosate 1.125-1.5 g per square meter and 75 g water were added for directional spray. 10, the characteristics of green merlon and the use of green merlon is a herbicide that is both endocytic and leaf contact. The product is a 25% wettable powder and is light brown. Lvmalong mainly prevents cattle from stagnation, sees Mai Niang, Pleurotus ostreatus, bluegrass, foxtail, and crabgrass, but it has a poor effect on mother-in-law, swine fever, and bitter buckwheat. It can be treated as soil or stems and leaves, absorbed by the roots and leaves of weeds, destroying its photosynthesis, thus making the weeds white, dead and dead. Green merlon has a long-lasting effect in the soil, usually between 2-3 months. There are two ways to use chloromeron, namely soil application and stem and leaf application. The application of soil is after spraying the soil, using 25% of the agent per square meter of 0.3-0.45 grams, adding 75 grams of uniform soil spray, if it does not rain within half a month after the application, it needs to resist drought. Stem and leaf application is the second leaf stage of weeds, and the dosage per square meter is the same as above, evenly sprayed on the stems and leaves.
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