Amide selective soil treatment herbicide metolachlor
What is metolachlor (51218-45-2)?
The pesticide and herbicide metolachlor is mainly absorbed through young shoots, conducts upward, and inhibits the growth of young shoots and roots. The mechanism of action of Cas 51218-45-2 mainly inhibits the protein synthesis of germinated seeds, and secondly inhibits the penetration of choline into phospholipids and interferes with the formation of lecithin. Since the young shoots of gramineous weeds have a stronger ability to absorb metolachlor than broadleaf weeds, the drug is far more effective in controlling gramineous weeds than broadleaf weeds.
The pesticide metolachlor is an amide-based selective soil treatment herbicide. It has strong inhibitory effect and selectivity; it is also easy to degrade in plants, has low toxicity to mammals, and is safe to use. The agent is absorbed through weed buds, among which monocotyledonous weeds are mainly absorbed by coleoptiles. Dicotyledonous weeds absorb it through the hypocotyls and young roots, and conduct it upward after absorption, until the protein synthesis of germinated seeds, thereby inhibiting the growth of young shoots and roots. Sensitive weeds will be poisoned and die after germination, before emergence or just after emergence. .
The herbicide metolachlor is an odorless, clear liquid that can be used as a selective pre-emergence herbicide. After grass weeds absorb the pesticide through their young shoots and roots, they inhibit protein synthesis and cause death. It is suitable for crops such as corn, soybeans, rapeseed, cotton, sorghum, vegetables, etc., to control annual grass weeds such as crabgrass, barnyard grass, goosegrass, setaria, stephanotis, teff, etc. It has poor control effect on broad-leaf grass. If broadleaf grasses and grassy weeds grow together, the two pesticides can be mixed and used.
Metolachlor (51218-45-2) mechanism of action
The pesticide metolachlor is an amide-based selective soil treatment herbicide. The pesticide is absorbed through weed buds, among which monocotyledonous weeds are mainly absorbed by coleoptiles, while dicotyledonous weeds are absorbed through hypocotyls and young roots. After absorption, they are conducted upward and continue to protein synthesis in germinated seeds, thus inhibiting buds and roots. The growth of sensitive weeds is caused by poisoning and death after germination but before emergence or just after emergence.
Metolachlor (51218-45-2) Toxicity
The acute oral LD50 in rats is 2780mg/kg, the acute dermal LD50>3170mg/kg, and the acute inhalation LC50>1750mg/m3 (4h). It has no irritating effect on rabbit eyes and is slightly irritating to the skin. The no-effect dose in the 90-day feeding test was 1000 mg/kg for rats and 500 mg/kg for dogs. The no-effect dose in the 2-year feeding test is 1000mg/kg for rats and 3000mg/kg for mice. Animal tests have shown no teratogenic, carcinogenic, or mutagenic effects. It is toxic to fish. The LC50 of rainbow trout is 3.9mg/L and the LC50 of catfish is 4.9mg/L. Low toxicity to birds. It is stomach poisonous to bees but has no contact toxicity.
Metolachlor (51218-45-2) Chemical Properties
The herbicide metolachlor is a colorless liquid, and the industrial product is a brown oily liquid. b.p.100℃/0.133Pa, vapor pressure 1.73×10-3Pa (20℃), relative density 1.12(20). It can be dissolved in various organic solvents such as methanol and dichloroethane, and its solubility in water is 530mg/L. It is not easily decomposed by light, is stable for two years after storage, and has a half-life of 25 days.
Metolachlor (51218-45-2) Pharmaceutical Properties
The herbicide metolachlor is an amide selective herbicide. The pure product is a colorless liquid, odorless, soluble in most organic solvents, and partially soluble in water above 20°C. Low toxicity to humans and animals. Doer is a selective pre-emergent soil treatment. For monocotyledonous weeds, it is mainly absorbed by the young shoots on the upper part of the seeds; for dicotyledonous weeds, it can be absorbed by the young shoots and roots, inhibiting the decomposition of proteins. The validity period in soil is 20-50 days.
Characteristics of metolachlor (51218-45-2)
The herbicide metolachlor is mainly absorbed and conducted upward through the plant buds, namely monocotyledons and coleoptiles, and the hypocotyl of dicot plants. After emergence, it mainly relies on root absorption and upward conduction, inhibiting the growth of young shoots and roots. If the soil moisture is good, the weeds will be killed in the budding stage; if the soil moisture is low, the soil moisture will increase with rainfall after the weeds are unearthed, and the weeds will absorb the leaves and shrink and the whole plant will die. Therefore, pesticide application should be carried out before weeds germinate.
The role of metolachlor (51218-45-2)
The herbicide metolachlor is mainly absorbed through the base and buds of weed buds and conducts upward. By inhibiting the synthesis of protein in germinated seeds, it inhibits the penetration of choline and interferes with the synthesis of lecithin, thus inhibiting the growth of buds and roots. The grass is killed in the young buds to achieve the purpose of controlling weeds. It can be used in crop fields such as soybeans, corn, cotton and cotton. It can control weeds such as crabgrass, barnyard grass, goosegrass, golden setaria, etc. It is also effective for purslane. It also has certain effects on broad-leaf weeds such as amaranth and forbidding, and is one of the most important herbicides used on many crops.
Metolachlor (51218-45-2) uses
The pesticide metolachlor is a selective pre-emergent herbicide. After grass weeds absorb the pesticide through their young shoots and roots, they inhibit protein synthesis and cause death. The control effect on broad-leaf grass is poor. If broad-leaf grass and grass weeds are mixed, the two chemicals can be mixed and used. To control weeds in soybean and corn fields, spray the soil surface with 72% EC, 15-23mL/100m2 of water after sowing and before emergence.
Metolachlor is a pre-emergent herbicide mainly used to control grass weeds. The product is a 2-acetanilide chloride herbicide, which is a cell division inhibitor. It can be used in soil treatment to control rice field barnyard grass, special-shaped sedge, cow's felt, duckweed, narrow-leaf Alisma, etc. Usually used 3 to 5 days before transplanting.
It has poor selectivity for wet-planted rice when applied alone, but has excellent selectivity for direct-planted rice when used together with ethidium. For example, if the mixture of this product and pyridin is used at 600+200gai/ha, the effect on duckweed, special-shaped sedge, acuta, flutterweed, etc. is more than 90%, and the control effect on Stephanotis is 100% .
Metolachlor (51218-45-2) control targets
The herbicide metolachlor can control annual weeds such as barnyardgrass, crabgrass, setaria, teff, and broadleaf weeds such as purslane, amaranth, and pigweed. It is suitable for weeding vegetable fields such as potatoes, cruciferous vegetables, watermelon and solanaceous vegetables.
(l) For weeding in vegetable fields such as sweet peppers, cabbage, radish, radish, Chinese cabbage, Chinese cabbage, rapeseed, watermelon, and seedling cauliflower, after sowing and before emergence, use 100 grams of 72% EC per mu, mixed with water and spray Treat the soil.
(2) For transplanting vegetable fields, such as cabbage, cauliflower, sweet (spicy) pepper, etc., after transplanting and slowing down the seedlings, use 100 grams of 72% EC per mu, mixed with water and sprayed in a directional manner to treat the soil.
How to use metolachlor (51218-45-2)
The herbicide metolachlor is used after cotton is sown to before emergence. Use 100-200 ml of 72% EC per acre in the south and 100-300 ml in the north. Add 30-50 kg of water and spray evenly on the surface.
The herbicide metolachlor has an adsorption effect on soil clay particles and organic matter, so the dosage should be determined based on the soil quality and soil organic matter content. The organic matter content is less than 3%, and the sandy soil, loam soil, and clay are 100 ml, 140 ml, and clay per acre; the organic matter content is more than 3%, and the sandy soil, loam soil, and clay are 140 ml, 180 ml, and clay 230 ml per acre.
Metolachlor: The duration of effect is 30 to 35 days, and the activity disappears naturally 10 to 12 weeks after application. Monocotyledonous grass weeds are mainly absorbed through shoot sheaths, while dicotyledonous weeds are absorbed through young shoots and young roots, conduct upward, and inhibit the growth of young shoots and fine roots. Sensitive weeds will be poisoned and die after germination, before emergence or just after emergence. . Graminous weeds have greater absorptive capacity than broad leaves. It is appropriate to apply the pesticide 3 to 5 days before transplanting, and 1 to 2 days after sowing in live fields before emergence. The drug is easily degraded by soil microorganisms and has a medium duration.
Metolachlor (51218-45-2) dosage
1) Soybean, corn, and rapeseed fields. When the soil organic matter content is less than 3%, use 100 ml/acre of 72% metolachlor/acre for sandy soil, 140 ml/acre for loamy soil, and 187 ml/acre for clay soil; when the soil organic matter content is more than 3%, For 72% metolachlor, use 140 ml/mu for sandy soil, 187 ml/mu for loamy soil, and 233 ml/mu for clay soil. In the south, 72% metolachlor is generally used at 100 to 150 ml/acre.
2)Peanut field. 72% metolachlor 150-200 ml/mu. The dosage of spring peanuts and summer peanuts cultivated with film covering can be appropriately reduced. 72% metolachlor 100-150 ml/mu can be used.
3) Watermelon, pumpkin, potato, beet, cotton and sesame fields. 72% metolachlor EC 100~200ml/mu. Mixed use: 72% metolachlor 100-187 ml/mu + 70% mesochloridone 20-40 g/mu in potato fields.
4) Use 72% metolachlor 80-127 ml/acre before transplanting in cabbage and cauliflower transplanting fields.
5) Pepper, eggplant, tomato, ginger and garlic fields. 72% metolachlor 100-150 ml/mu.
6) Cabbage live broadcast field. In North China, 72% metolachlor is used at 80 to 100 ml/acre. For summer sowing of pakchoi in the middle and lower reaches of the Yangtze River, 72% metolachlor 50-80 ml/mu is used.
7) Celery Nursery. 72% metolachlor 100~127ml/mu.
8) Leek nursery. 72% metolachlor 100~127ml/mu. 72% metolachlor 80-100 ml/mu in old stubble leek fields. There are many types of vegetables. Annual vegetables propagated with small seeds, such as amaranth, coriander, celery, etc., are sensitive to metolachlor and should not be used.
9)Sugar cane fields. ① After sugarcane planting, use 72% metolachlor 100-200 ml/acre before emergence. Mixed use: 72% metolachlor 100 ml/mu + 38% atrazine 100-200 ml/mu.
② Use 72% metolachlor 100-150 ml/mu before covering the sugarcane mulched fields (clear seeding or interplanting).
10)Carrot field. 72% metolachlor 100-200 ml/acre.
Differences between A, B, C, D and metolachlor (51218-45-2)
Alachlor, acetochlor, pretilachlor, butachlor, metolachlor, and metolachlor all belong to amide herbicides. Amide herbicides are a major category of herbicides and are currently There are more than 50 herbicides with an amide structure. Although some herbicides have an amide structure, they are still classified into other categories.
According to the mode of action, amide herbicides can be divided into the following six categories.
(1) Carotenoid biosynthesis inhibitors, such as diflufenac, etc.
(2) Cell division inhibitors, such as dimethiochlor, naphthyrochlor, etc.
(3) Agents that inhibit protein synthesis, such as acetochlor, butachlor, metolachlor, etc.
(4) Cell wall biosynthesis inhibitors, such as clomazone, etc.
(5) Destroy fatty acid synthesis, such as wheat straw and so on.
(6) Hormone type, such as barnylamine, etc.
Among them, the most widely used and most mature ones are chlorinated amides, which are also protein synthesis inhibitors (alachlor, acetochlor, pretilachlor, butachlor and metolachlor, etc.).
1 herbicide alachlor
Alachlor is a selective dryland pre-emergence herbicide that controls a variety of annual monocotyledonous and certain dicotyledonous weeds.
Alachlor is commonly used in soybean, corn, peanut, cotton, potato, sugarcane, rape and other crop fields to control barnyard grass, crabgrass, cricket grass, setaria, fall barnyard grass, brachiaria, purslane, amaranth, and whorled corn. Annual grass weeds and broadleaf weeds such as grass, pigweed, and polygonum. Alachlor mainly acts on pre-emergence and is absorbed through the bud sheaths of weeds, hindering their protein synthesis, thereby causing the death of weeds. It is ineffective against unearthed weeds. Generally, the control effect of alachlor is lower than that of metolachlor and acetochlor. Alachlor can be adsorbed by soil particles and is not easily leached away, and its duration of effect is about 35 days.
Because alachlor is extremely toxic to aquatic organisms and may have adverse effects on the water environment, it can only be used in dry lands.
2 herbicide acetochlor
Acetochlor is one of the most widely used herbicides in the world.
Acetochlor is a selective pre-emergence treatment herbicide that can be used to control annual grass weeds and some broadleaf weeds with small seeds. It is highly effective on grass weeds and has certain effects on some broadleaf weeds, but it is not effective on some broadleaf weeds. Ineffective on perennial weeds; suitable for soybeans, corn, peanuts and other crops. Acetochlor is absorbed through the coleoptile of monocotyledonous plants or the hypocotyl of dicotyledonous plants, and is conducted upward after absorption. It mainly inhibits cell growth by hindering protein synthesis, causing weed buds and roots to stop growing, and then die. Acetochlor has a duration of about 45 days, is not easily leached, and can be degraded by microorganisms.
Acetochlor has a similar mode of action and control effect to alachlor, but its activity is much greater than that of alachlor. Similar to alachlor, acetochlor is extremely toxic to aquatic organisms and long-term use may have an impact on the water environment, so its use in paddy fields is prohibited. Due to the potential risks of acetochlor, the EU banned acetochlor in 2012. Up to now, acetochlor is still an excellent soil treatment agent used in most countries around the world.
3 Herbicide Pretilachlor
Pretilachlor is a highly selective herbicide for rice fields. It is safe for rice and has a broad spectrum of herbicides.
Pretilachlor is a pre-emergent herbicide in rice fields. It is used to control annual grass weeds and broadleaf weeds in direct-seeded rice fields. It is a cell division inhibitor. It is often used in soil treatment to control rice fields, barnyard grass, special-shaped sedge, oxgrass, duckweed, narrow-leaved Alisma, etc. Usually used 3 to 5 days before transplanting.
The mechanism of action of pretilachlor is that when weeds germinate, they can be absorbed through plant hypocotyls, mesocotyls and coleoptiles, directly interfering with protein synthesis and the formation of polysaccharide ribosomes in weeds, and indirectly affecting photosynthesis and respiration. Affected, the injured weed seedlings become distorted, the primary leaves are difficult to extend, the leaves turn dark green, the growth stops, and they die.
Pretilachlor is low-toxic, broad-spectrum, and highly effective, but it is low-toxic to bees and highly toxic to fish.
4 herbicide butachlor
Butachlor is a selective pre-emergent herbicide. It is mainly used to control annual grass weeds and certain broadleaf weeds in direct-seeded or transplanted rice fields.
Butachlor is used to control annual grass weeds and certain broadleaf weeds in direct-seeded or transplanted rice fields. Also selective for wheat, barley, sugar beet, cotton, peanut and cabbage crops. Butachlor is used as a pre-emergent soil surface treatment and can also be used in post-emergent paddy fields. It has a good effect on controlling barnyardgrass. Butachlor and pretilachlor are both pre-emergent soil surface treatment agents in rice fields, but butachlor is the "predecessor" of pretilachlor, which has less impact on water bodies and is more efficient. Butachlor was launched early and is highly toxic to fish and amphibians. This year, the market has been gradually replaced by new rice herbicides.
5 herbicide metolachlor (Metolachlor)
Metolachlor is a selective herbicide. Metolachlor is used in upland crops (soybeans, corn, cotton, etc.), vegetable crops (potatoes, cabbage, tomatoes, etc.), orchards and nurseries, and can control annual grasses such as goosegrass, crabgrass, setaria, cotton grass, etc. Weeds, as well as broad-leaf weeds such as amaranth and purslane, as well as crushed rice sedge and oil sedge. Its ability to control grass weeds is stronger than broadleaf weeds.
Metolachlor inhibits cell growth mainly by hindering protein synthesis. Metolachlor is absorbed and conducted upward through the plant buds, that is, the coleoptiles of monocotyledonous plants and the hypocotyl of dicots. It is also absorbed and conducted by seeds and roots, thereby inhibiting the growth of buds and fine roots. Sensitive weeds are They will be poisoned and die after germination, before emergence or just after emergence. It has high herbicidal activity, is easily decomposed by soil microorganisms, and has a medium duration of effect.
5 herbicide metolachlor
S-Metolachlor is the effective S-isomer of metolachlor. Its target crops and usage methods are similar to metolachlor, but under the same dosage and conditions, S-Metolachlor is the effective isomer of metolachlor. The activity of metolachlor is 1.4 to 1.6 times higher than that of its mixed compound metolachlor.
The content of S-isomer (active ingredient content) in refined metolachlor can reach 96%, which not only greatly improves the herbicidal activity, but also does not cause damage to the primary roots of crops, thus avoiding unnecessary yield reduction.Alachlor, acetochlor, metolachlor and sperm metolachlor are all used for weeding in dry fields and are pre-emergent soil treatment agents. Their activity sequence is: sperm metolachlor ≈ acetochlor > isopropyl Alachlor＞Alachlor.
Metolachlor (51218-45-2) Precautions
1. Generally not applied to rainy areas and sandy soils with organic matter content below 1%.
2. Since this product has a certain irritating effect on the eyes and skin, please pay attention to protection when spraying.
3. If the soil moisture is suitable, the weeding effect will be good. In case of drought, the weeding effect will be poor, so the soil should be mixed in time after application.
4. This product should be stored in a dry, cool place. Crystals will precipitate when stored below -10 degrees Celsius. When using, warm water should be heated outside the container to slowly dissolve the crystals without affecting the efficacy.
Herbicide metolachlor (51218-45-2) price
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