The common name of the pesticide Weibomu No. 2 is Weibaimu, and its Chinese alias is: Weibamu, Baofengharvest, sodium thiocarb, Xianke, Weibomu.
Weibamu
Usually, metacarbamate is classified as a dithiocarbamate nematicide with fumigation effect. It degrades into methyl isocyanate in the soil and exerts fumigation effect by inhibiting biological cell division and DNA. , RNA and protein synthesis and obstruction of biological respiration, which can effectively kill root-knot nematodes, weeds and other harmful organisms, thereby obtaining clean and healthy soil.
Chinese name
Weibaimu
UN number
3006
CAS
137-42-8
EINECS number
205-293-0
Basic information
Chinese name: Weibaimu< /p>
Chinese alias: Vibam, Baofengshou, Thiiocarb sodium, Xiangram
Chemical name: Sodium methyldithiocarbamate
English name: metham -sodium
English alias: sodium methyldithiocarbamate; Metham Sodium; sodium (methyldisulfanyl)carbamate
Molecular formula: C2H4NNaS2
Molecular weight: 129.17
Structural formula:
Hazard category code: R22; R31; R34; R50/53
Physical and chemical information
Melting point: -60℃
Boiling point: 218℃
Vapor pressure: (20℃)0.0385Pa
Density: Relative density (water=1) 1.169 (liquid)
Solubility: (g/L20℃) Water: 772, ethanol <5, insoluble in most organic solvents; stable in alkaline, decomposed when exposed to acid.
Appearance and properties: The original drug appears as a white crystalline powder with a pungent odor, and the preparation appears as a light yellow-green stable homogeneous liquid with no visible suspended solids.
Toxicity: Low toxicity, academically classified as a nematicide, and has bactericidal and herbicidal effects. The acute oral LD50 of the original drug in male rats is 820 mg/kg, the acute transdermal LD50 in rabbits is 800 mg/kg, and the acute transdermal LD50 in rabbits is 800 mg/kg. It is irritating to the eyes and mucous membranes, toxic to fish, and non-toxic to bees.
Pesticide dosage form: 35%, 42% aqueous solution
Mode of action
Can be used as a substitute for methyl bromide.
Scope of application and prevention and control objects
It is suitable for sterilizing the seedbed soil of cash crops such as greenhouses, greenhouses, plastic sheds, flowers, tobacco, Chinese herbal medicines, ginger, yam, etc., and soil for repeated planting. And tissue culture seedlings and other culture substrates, bonsai soil, edible mushroom bed soil, etc. are fumigated and sterilized, which can prevent various diseases and insect pests caused by nematodes, fungi, bacteria, underground pests, etc., and also prevent horse ponds, wheatgrass, and sedges. Waiting for weeds.
Instructions for use
Instructions for reference
Key points for application: temperature, humidity, depth, uniformity and airtight application
Application After applying the pesticide, keep the soil humidity between 65% and 75%, the soil temperature above 10°C, and apply the pesticide evenly. The depth of the pesticide solution in the soil should reach 15~20cm. Immediately after applying the pesticide, cover it with a plastic film and seal it tightly to prevent air leakage. Sealed for more than 15 days.
1. How to use the seedbed:
1. Soil preparation: Before applying pesticides, loosen the soil, level it, and keep it moist.
2. Application: Dilute the dosage of the preparation with water 50-75 times (depending on soil moisture), spray evenly onto the surface of the seedbed and allow the liquid to penetrate 4 cm into the soil.
3. Covering: Cover with polyethylene film immediately after application to prevent leakage of chemical gas.
4. Film removal: Remove the mulch film 10 days after application and rake the soil to allow the residual gas to fully evaporate for 5 to 7 days.
5. Sowing: After the residual medicinal gas in the soil has dissipated, the soil can be sown or planted.
2. How to use nutrient soil:
1. Prepare nutrient soil: If you use organic fertilizer, base fertilizer, etc., you need to mix it evenly with the soil first.
2. Prepare the medicinal solution: Dilute this medicine with water 80 times and prepare the solution for later use.
3. Application: Spread the nutrient soil evenly on the film or cement floor to a thickness of 5 cm, spray the prepared medicinal solution evenly onto the nutrient soil, moisten it for more than 3 cm, and then cover it with 5 cm Nutrient soil, spray the prepared medicinal solution, repeat the process to form a pile, and finally cover it tightly with a film to prevent the evaporation of medicinal gas.
4. Film removal: Remove the film 10 days after application, loosen the nutrient soil to fully disperse the remaining medicinal gas, and loosen it again after 5 days before use.
3. How to use protected areas and land:
1. Preparation work before pesticide application
① Garden clearing: remove field crop plants and residues (including Weeds and other roots, stems and leaves).
②Water replenishment: According to the soil moisture, water appropriately to make the soil moisture reach 65%~75%.
③ Fertilization: In order to prevent organic fertilizers from carrying pathogens, organic fertilizers need to be evenly applied to the field before application. "Live" bacterial fertilizer should be used after application.
④ Plowing: Plow and loosen the soil before applying pesticides.
3. Application method
① Furrow application: Dig a furrow on the plowed field with a furrow depth of 15~20cm and a furrow spacing of 20~25cm. The dosage of the preparation is per mu. Apply an appropriate amount of water (generally about 80 times, the current amount is used), and apply it evenly into the ditch. Immediately after application, cover with soil and plastic film to prevent the volatilization of the medicinal gas.
②Injection application: Use an injection device to apply the pesticide evenly in the field (appropriate amount of water according to the condition of the device and soil moisture), with a spacing of 20~25cm x 20~25cm. After application, the holes should be closed and covered with plastic. Thin film to prevent the evaporation of medicinal gas.
③ Drip irrigation pesticide application: Drip irrigation pesticide application requires an appropriate increase in the amount of pesticide and water to meet the pesticide application requirements.
4. Dispersion: The airtight fumigation time after application changes with the temperature. The airtightness should be more than 15 days when the temperature is 20℃~25℃, and the airtightness should be more than 10 days when the temperature is 25℃~30℃. After removing the film, plow the soil deeply on the same day or the next day to loosen the soil and allow it to aerate for 5 to 7 days. To test the effect of gas dissipation, a cabbage seed germination test can be conducted to observe the health of the cabbage seedlings and roots to determine whether the poisonous gas has dispersed. After confirming that the medicinal gas has dispersed, you can sow or transplant.
5. Precautions
① Application time: Generally choose 4 a.m. to 9 a.m. or 16 a.m. to 20 p.m. to avoid high temperatures at noon to prevent excessive medicinal gas. Evaporate and ensure the safety of pesticide applicators.
② This medicine is easy to decompose in dilute solution, so it should be prepared immediately when using it. This medicine can react with metal salts, so avoid using metal utensils when preparing the medicine.
③If leaks or holes are found in the covering film after application, they should be sealed in time. To ensure the effectiveness of the medicine, the medicine can be re-applied.
④ This drug has an irritating effect on the eyes and mucous membranes. Protective equipment should be worn when administering the drug.
⑤For other precautions, please see the product label for details.
Notes
1. This product cannot be applied directly to the crop surface. The soil treatment should be applied up to once per season.
2. The effect is good when the ground temperature is above 10℃. When the ground temperature is low, the fumigation time needs to be extended.
3. This product should be stored above 0℃. If the temperature is lower than 0℃, crystals will easily precipitate. If crystals are found before use, it can be placed in a warm place to heat up and shake until fully dissolved. It will not affect use. Effect; This agent needs to be prepared immediately when used, and the diluent cannot be retained for a long time; this agent cannot be mixed with Bordeaux mixture, lime sulfur mixture, etc.
4. When applying pesticides, you should wear long clothes, long trousers, gloves, glasses, masks, etc. Smoking, eating, etc. are prohibited. Wash hands, face and other exposed parts after applying pesticides.
5. Apply pesticides away from aquaculture areas, rivers and other waters, and it is prohibited to clean pesticide application equipment in rivers and other waters.
6. Pregnant and lactating women should avoid contact with this product.
7. Used containers should be disposed of properly and cannot be used for other purposes or discarded at will.
Poisoning first aid
1. Skin contact: Take off contaminated clothing immediately and wash contaminated skin thoroughly with soap and plenty of water for at least 15 minutes.
2. Eye splash: Open your eyelids immediately, rinse with water for 10-15 minutes, and then consult a doctor.
3. General poisoning: You should leave the site of drug administration immediately. When the heart activity weakens, you can warm your body with strong tea or coffee and send to the hospital for symptomatic treatment.
4. Ingestion by mistake: Immediately induce vomiting and use 1%-3% tannin solution for gastric lavage. In serious cases, send the patient to the hospital with this label for diagnosis and treatment.
Storage and transportation methods
Webamu products should be stored in a dry, cool, ventilated, rain-proof place, away from fire or heat sources. Keep out of reach of children and locked. Do not store or transport it with other commodities such as food, beverages, feed, etc.