Pre emergence herbicide for rice fields pretilachlor
What is pretilachlor (51218-49-6)?
The herbicide pretilachlor is a highly selective rice pre-emergence herbicide. It is mainly used to control annual grass weeds and broadleaf grasses. It belongs to the 2-chloroacetylaniline herbicides and is a cell division inhibitor and weed seed control agent. The pesticide is absorbed during the germination process, and the root absorption is poor, so it can only be used for pre-emergence soil treatment. Rice is also sensitive to pretilachlor during the germination period. To ensure the safety of early medication, pretilachlor is often added with the safety agent triclofenac.
The herbicide pretilachlor is mainly used in direct-seeded rice fields. The correct use method has the characteristics of safety for the growth of direct-seeded rice, broad herbicidal spectrum, and good herbicidal effect. It can basically control weed damage during the entire growth period. It is currently the best choice for barnyard grass. It is an ideal pesticide for the control of resistant weeds such as Phytophthora spp.
Pretilachlor (51218-49-6) physical and chemical properties
Chinese name: Pretilachlor
English name: pretilachlor
Chemical name: 2-chloro-2′,6′-diethyl-N-(2-propoxyethyl)-N-acetanilide; 2-chloro-N-(2,6-diethylphenyl )-N-(2-propoxyethyl)acetamide
Product name: Sofit
Toxicity: Low toxicity to humans and animals, rat oral LD50 is 6,099 mg/kg, acute dermal LD50 >3,100 mg/kg, fish toxicity is higher, carp LC50 is 9.8 mg/kg.
Melting point: less than -20°C
Density: 1.076
Solubility: Solubility in water at 20°C is 50 mg/L, easily soluble in benzene, hexane, methanol and methylene chloride.
Appearance: colorless liquid
Storage conditions: Warehouse is ventilated, low-temperature and dry; stored and transported separately from food raw materials
CAS registration number: 51218-49-6
Molecular formula: C17H26ClNO2
Molecular weight: 311.85
Pretilachlor (51218-49-6) Chemical Properties
The pure herbicide pretilachlor is a colorless liquid. b.p.135℃/0.1Pa, relative density 1.076 (20℃), vapor pressure 0.133×10-3Pa. Easily soluble in most organic solvents, the solubility in water at 20°C is Chemicalbook 50mg/L, and the distribution coefficient (n-octanol/water) is 12020. Stable for 2 years when stored at room temperature. The hydrolysis half-life at 20℃ is 200d (pH=1~9), 14d (pH=13), and the half-life in soil is 20~50d.
Pretilachlor (51218-49-6) toxicity
The acute oral LD50 of the original drug in rats is 6099mg/kg, the acute transdermal LD50>3100mg/kg, and the acute inhalation LC50>2.8mg/L (4h); the no-effect dose in the half-year feeding test in dogs is 7.Chemicalbook 5mg/day kg. Animal tests have shown no carcinogenic, teratogenic or mutagenic effects. The LC50 of crucian carp is 2.3 mg/L, and the LC50 of rainbow trout is 0.9 mg/L (both 96 hours); it is irritating to the skin, slightly irritating to the eyes, and is toxic to bees.
Pretilachlor (51218-49-6) function
The herbicide pretilachlor absorbs the agent during the germination process of weed seeds, and the root absorption is poor. Only pre-emergence soil treatment can be done. Rice is relatively sensitive to pretilachlor during the germination period. To ensure the safety of early medication, the safener CCA123407 is often added. It is safe for rice and kills all kinds of weeds. Scope of application: Gramineae and broadleaf weeds.
Pretilachlor (51218-49-6) application
Product characteristics of the herbicide pretilachlor: The herbicide pretilachlor is an amide herbicide specially used for selective pre-emergence treatment and water-seeded rice fields and seedling fields. Soluble in most organic solvents. Moderately irritating to eyes and skin. Usage: Pretilachlor has a good control effect on various paddy field weeds such as barnyard grass, duckweed, motherwort, Chardonnay, etc. However, the effect on perennial triangular grasses is poor.
In direct-seeded rice fields and seedling fields, the recommended dosage of 30% EC is 1050~1650 ml/ha. In southern tropical or subtropical rice areas and indica rice producing areas, the lower limit of the recommended dose is generally used based on the density of weeds in the field. Treatment can be carried out on the day after sowing (germination) or 4 days after sowing. When applying pesticides, the soil should be kept saturated with water and there should be a water film on the surface. A shallow layer of water can be irrigated 24 hours after treatment to prevent the topsoil from drying out. After 3 days, normal field management was resumed. In the cold temperate zone of the north, the temperature is low, and the growth of rice is slow. If the pesticide is applied soon after sowing, the rice will not be able to absorb the safener because it has not taken root, and phytotoxicity will easily occur. May reduce the weed control effect. Therefore, mastering the appropriate timing of application is the key to exerting the efficacy. The rice seedlings should take root (2-leaf stage) before the 1.5-leaf stage of barnyardgrass, that is, 10-15 days after sowing, and the recommended dose should be used. upper limit. When raising seedlings in wet conditions, cover the bed with 1 cm of soil after sowing (soaking seeds). Apply pesticides immediately and cover with plastic film to keep water around the bed. Not only is the weeding effect good, but the quality of the seedlings is also good.
The herbicide pretilachlor belongs to the 2-acetanilide chloride herbicides and is a selective pre-emergence treatment agent. It can be absorbed through plant hypocotyls, mesocotyls and coleoptiles, and is slightly absorbed by the roots. It directly interferes with protein synthesis in weeds and has indirect effects on photosynthesis and respiration. Rice has a strong ability to decompose pretilachlor and thus has certain selectivity. Rice is relatively sensitive to pretilachlor during the germination period. To ensure the safety of early medication, pretilachlor is often added to pretilachlor.
Pretilachlor (51218-49-6) uses
The herbicide pretilachlor is a selective pre-emergent herbicide and cell division inhibitor. Weeds absorb chemicals through the hypocotyls and coleoptiles, interfering with protein synthesis and also indirectly affecting the photosynthesis and respiration of weeds. Generally, soil treatment is used to control weeds such as barnyardgrass, duck leaf grass, heterosedge, mother grass, cow felt, Ci algae, firefly rush and other weeds in paddy fields, and the control effect on perennial weeds is poor. The dosage is 4.5~5.3g/100m2. For example, in rice seedling fields or direct seeding fields, use 15~17mL/100m2 of 30% EC and spray it with water or mix it with poisonous soil. In southern or subtropical areas, the lower limit of dosage is required, and in northern areas, testing is required before application.
The herbicide pretilachlor is used for soil treatment, and can control rice field barnyard grass, special-shaped sedge, cow felt, duckweed, narrow-leaf Alisma, etc. It has poor selectivity for wet-planted rice when applied alone, but has excellent selectivity for direct-planted rice when used together with ethidium. Weeds absorb chemicals through the hypocotyls and coleoptiles, interfering with protein synthesis and also indirectly affecting the photosynthesis and respiration of weeds. It can control weeds such as barnyard grass, duckweed, special-shaped sedge, mother grass, cow felt, and firefly in rice fields. It has poor control effect on perennial weeds.
The herbicide pretilachlor is mainly used to control grass weeds. The product is a 2-chloride acetylaniline herbicide, which is a cell division inhibitor. It can be used in soil treatment to control barnyardgrass, heterosedge, cattle felt, bermudagrass, Alisma narrowleaf, etc. Usually used 3 to 5 days before transplanting. This product 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 product is used in a mixture of 600+200 gai/ha, the effect on the common sedge, special-shaped sedge, pointed petal flower, and fluttering grass is more than 90%, and the control effect on the daughter of the daughter is 100%. .
The herbicide pretilachlor can control weeds such as special-shaped sedge, cow's felt, duckweed, and knotweed in rice fields; it is a selective pre-emergent herbicide and a cell division inhibitor. Weeds absorb chemicals through the hypocotyls and coleoptiles, interfering with protein synthesis and also indirectly affecting the photosynthesis and respiration of weeds. Generally, soil treatment is used to control weeds such as barnyardgrass, duck leaf grass, heterosedge, mother grass, cow felt, Ci algae, firefly rush and other weeds in paddy fields, and the control effect on perennial weeds is poor. The dosage is 4.5~5.3g/100m2. For example, in rice seedling fields or direct seeding fields, use 15~17mL/100m2 of 30% EC and spray it with water or mix it with poisonous soil. In southern or subtropical areas, the lower limit of dosage is required, and in northern areas, testing is required before application.
1. Selective pre-emergence herbicide and cell division inhibitor. Weeds absorb chemicals through the hypocotyls and coleoptiles, interfering with protein synthesis and also indirectly affecting the photosynthesis and respiration of weeds. Generally, soil treatment is used to control weeds such as barnyardgrass, duck leaf grass, heterosedge, mother grass, cow felt, Ci algae, firefly rush and other weeds in paddy fields, and the control effect on perennial weeds is poor. The dosage is 4.5~5.3g/100m2. For example, in rice seedling fields or direct seeding fields, use 15~17mL/100m2 of 30% EC and spray it with water or mix it with poisonous soil. In southern or subtropical areas, the lower limit of dosage is required, and in northern areas, testing is required before application.
2. Selective pre-emergence herbicide and cell division inhibitor. Used for soil treatment, it can control rice field barnyard grass, special-shaped sedge, cow's felt, duckweed, narrow-leaf Alisma, etc. It has poor selectivity for wet-planted rice when applied alone, but has excellent selectivity for direct-planted rice when used together with ethidium. Weeds absorb chemicals through the hypocotyls and coleoptiles, interfering with protein synthesis and also indirectly affecting the photosynthesis and respiration of weeds. It can control weeds such as barnyard grass, duckweed, special-shaped sedge, mother grass, cow felt, and firefly in rice fields. It has poor control effect on perennial weeds.
How to use pretilachlor (51218-49-6)
Pretilachlor herbicide is a highly efficient special herbicide for rice fields. The land is first prepared and then germinated and sown. The shallow water layer is irrigated 2-4 days after sowing. Use 100-115ml of 30% concentration of EC per acre and add about 30kg of water. Spray the rice field evenly, or mix about 20 kilograms of fine fluvo-soil and spread it over the entire field to keep the rice field moist without leaving water. In order to ensure its safety performance during early use, a safener needs to be added.
The difference between pretilachlor (51218-49-6) and butachlor
The pre-emergence sealing herbicide method of rice refers to a weeding method that uses pre-emergence sealant herbicide ingredients to kill weeds in their budding state before the weed seeds germinate. The principle is to take advantage of the time difference between the growth of rice and weeds, that is, when the rice seeds take root, the weeds have just sprouted but have no roots. The herbicidal ingredients are absorbed through the bud sheaths, while the safener ingredients can only be absorbed by the roots. At this time, the weeds have buds but no roots, and can only absorb the herbicidal ingredients, but cannot absorb the safener ingredients, so they are killed. Although rice also absorbs herbicidal ingredients, rice has roots and can also absorb safener ingredients. The herbicidal ingredients are detoxified by the safener, so it is safe for rice. At present, weed resistance has increased rapidly and field grasses are complex. Weed control has become one of the most difficult problems in rice production. In this case, pre-emergent closed weeding methods are particularly necessary. The mainstream pre-emergent blocking agents are butachlor, pretilachlor and their compound preparations.
Pretilachlor is an amide herbicide, which generally contains the safety agent triclofenac. It is mainly sprayed 2-4 days after rice germination and sowing. It is safe for rice and is generally not prone to phytotoxicity. The conventional recommended dosage is 80-100 ml/acre of 30% pretilachlor EC. It can also be spread on the soil 3-5 days before and after rice transplanting. It is flexible to use. When excessive use of pretilachlor or the use of pretilachlor that does not contain triclofen, it will also cause phytotoxicity to rice. The specific manifestations are severe dwarfing of the plants, turning of the heart leaves and curling, and the growth of rice is seriously inhibited. Therefore, in It should be avoided as much as possible in production.
Butachlor is an amide herbicide. It mainly kills weeds by inhibiting fat synthesis. It has good weeding effect and strong selectivity. It can be used to seal weeds in dry and water-seeded fields. It can control weeds before germination and the 2-leaf stage. Grass works. 60% butachlor emulsifiable concentrate (containing safener) is mainly used for soil sealing treatment 2-4 days after sowing in water direct seeding. The conventional recommended dosage is about 100 ml/acre. The usage method is spraying or broadcasting on poisonous soil. Excessive dosage or improper application methods will also cause phytotoxicity to rice seedlings. The symptoms of phytotoxicity are brown spots on rice stems and leaves, dwarfing of plants, slow growth, and sharp reduction of root systems. Rice growth is seriously affected. Suppression can lead to death of seedlings in severe cases.
Pretilachlor: The biggest advantage lies in safety, but the disadvantage is that the window period of application is short, once the weeds germinate, they lose their effect, and the resistance is high. The control effect on resistant barnyardgrass and stephachlor is not as good as butachlor, and the duration of effect is short (only Can seal the first peak period of weeding).
Butachlor: The advantage is that it is effective against 2-leaf pre-leaf weeds, and the application window is long. It has special effects on the current resistant barnyardgrass and Qianjinzi, especially the long-lasting effect (can seal the 2 peak periods of weeding); defects It is less safe than pretilachlor (butachlor with added safener can be used correctly on early rice and is also very safe), and it is highly toxic to fish and shrimp, so it cannot be used in fish and shrimp farms.
Precautions for Pretilachlor (51218-49-6)
1. The sown rice must have normal roots and buds. Avoid buds without roots.
2. For use in northern rice areas, the application period should be extended appropriately, first tested, and then widely promoted to avoid phytotoxicity.
3. After the soil is well prepared, it is necessary to sow and apply medicine in time, otherwise weeds will emerge and affect the efficacy of the medicine.
Price of herbicide pretilachlor (51218-49-6)
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Supplier of the herbicide pretilachlor (51218-49-6)
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