Application areas and usage techniques of the herbicide bentazone
What is bentazone (25057-89-0)?
Herbicide bentazone Molecular formula: C1QH12N2O3S, Cas 25057-89-0 Chemical name: 3-isopropyl-(1H)-benzo-2,1,3-thiadiazin-4-one-2,2-dioxide It is a selective and contact-killing post-emergent herbicide. It is used to control broadleaf weeds and sedges in crops such as rice, peanuts, corn, wheat and soybeans. It is ineffective against grass weeds.
The herbicide bentazone is used as a post-emergence stem and leaf treatment herbicide. It mainly penetrates into the chloroplasts through the leaf surface and inhibits photosynthesis, causing the weed leaves to lose green and dry up, eliminating or reducing the direct impact of weeds on crops (transmitting diseases). , pests, competing with crops for nutrients, water and growth space), indirect effects (reducing the quality of agricultural products, increasing management labor and production costs), thereby increasing crop yields.
The herbicide bentazone is a heterocyclic selective contact post-emergence herbicide. Crops registered and actually used in China include rice (live-seeded fields and transplanted fields), corn, wheat, barley, peanuts, sorghum, Soybeans, broad beans, kidney beans, peas, onions, potatoes, sugar cane, tea gardens, sweet potatoes, alfalfa, grassland pastures, warm season lawns and some Chinese herbal medicines (astragalus, perilla, mint, spearmint, etc.), etc., are mainly used to control broadleaf weeds. leaf weeds and sedge weeds, and is ineffective against grass weeds.
Bentazone (25057-89-0) Chemical Properties
The herbicide bentazone is a white crystalline solid. m.p.138℃, decomposition temperature 200℃, vapor pressure <1.33×10-5Pa (20℃), relative density 1.22. Solubility at 20℃: acetone 150.7%, ethanol 0.02%, water 0.05%. Stable to acid, alkali and light.
Physical and chemical properties of bentazone (25057-89-0)
The herbicide bentazone is a white, odorless crystal with a melting point of about 139.4 to 141°C. It decomposes at 200°C and has a vapor pressure of 0.17mPa (20°C). The solubility in water at 20°C is 0.057%, and the solubility in the following solvents are: 150.7% in acetone, 86.1% in ethanol, 61.6% in ether, 3.3% in benzene, and 0.02% in cyclohexane. The active ingredient content of the original drug is 60%, the appearance is dark brown liquid, and the density is about 1.23. Storage stability at room temperature for at least 2 years.
Bentazone (25057-89-0) mechanism of action
The herbicide bentazone is a contact-killing, selective post-emergence herbicide. When used in dry fields, it penetrates into the chloroplasts through the leaf surface and inhibits photosynthesis. Soybeans can metabolize bentazone and degrade it into active substances. However, after the application of the pesticide to sensitive plants, the carbon dioxide assimilation process is inhibited until it completely stops, and the leaves wilt and turn yellow, eventually leading to death. A sunny and warm climate is conducive to the effectiveness of the medicine. When used in rice fields, it can penetrate through the leaves and absorb through the roots, and is transmitted to the stems and leaves, strongly inhibiting the photosynthesis and water metabolism of weeds, causing nutritional starvation, physiological dysfunction and death.
Bentazone (25057-89-0) herbicidal mechanism
The herbicide bentazone mainly aggravates the death of plant cells by inhibiting physiological mechanisms such as photosynthesis, respiration, and water metabolism of green plants, thereby causing the death of weeds. Therefore, based on this herbicidal mechanism, bentazone has weed-killing properties. It has the characteristics of excellent control effect, broad herbicidal spectrum and low resistance to pesticides.
Characteristics of bentazone (25057-89-0)
The herbicide bentazone is a heterocyclic compound. It is a contact-type selective post-emergence herbicide. It is used to treat stems and leaves in the seedling stage and works through leaf contact. Used in dry fields. First, it penetrates through the leaf surface and is transmitted to the chloroplast to inhibit photosynthesis; paddy fields use both photosynthesis and water metabolism, causing nutritional starvation, physiological dysfunction and death. The active ingredients are metabolized into weakly active glycoconjugates in the body of the resistant crop and detoxified. It is safe for soybeans, corn, rice, wheat, peanuts, beans, peas, onions, sugar cane, etc. Bentazone can be decomposed by microorganisms in the soil 8 to 18 weeks after application.
The herbicide bentazone is often mixed with herbicide ingredients such as 2-methyl-4-chloride, fomesafen, imazapyr, acifluorfen, quizalofop, atrazine, isosulfonate, etc., and is used to produce compound formulations. herbicide.
Bentazone (25057-89-0) uses
The herbicide bentazone is a contact-type, selective post-emergence herbicide. Seedling stage treatment works through leaf contact. When used in dry fields, it penetrates into the chloroplasts through leaves and inhibits photosynthesis; when used in paddy fields, it can also be absorbed through roots and transmitted to stems and leaves, hindering photosynthesis and water metabolism of weeds, causing physiological dysfunction and death. It is mainly used to control dicotyledonous weeds, paddy field sedges and other monocotyledonous weeds, so it is a good herbicide in rice fields. It can also be used to weed wheat, soybeans, cotton, peanuts and other dry field crops, such as three-edge grass, water sedge, duckweed, cow felt, flat strawgrass, wild water chestnuts, pigweed, polygonum, amaranth, pigweed , Jiejie grass, etc. The effect is good when used on hot and sunny days, and vice versa. The dosage is 9.8~30g active ingredient/100m2. For example, if weeding in rice fields occurs 3 to 4 weeks after planting, when weeds and sedges emerge and merge to the 3 to 5 leaf stage, use 48% liquid agent 20 to 30 mL/100 m2 or 25% water agent 45 to 60 mL/100 m2, and add 4.5% water to the rice field. kg, when applying the pesticide, drain the field water, choose a sunny day with high temperature and no wind, apply the pesticide evenly on the stems and leaves of the weeds, and then re-irrigate for 1 to 2 days, which can control sedge weeds and broad-leaf weeds. Not effective against barnyardgrass.
Used to control monocotyledonous and dicotyledonous weeds in corn and soybean fields.
It is suitable for soybeans, rice, wheat and peanuts, pastures, tea gardens, sweet potatoes, etc., and is used to control sand grass and broadleaf weeds.
The herbicide bentazone is a contact-type, selective post-emergence herbicide, which is treated in the seedling stage and works through leaf contact. When used in dry fields, it penetrates into the chloroplasts through the leaves and inhibits photosynthesis. When used in paddy fields, it can also be absorbed through the roots and transmitted to the stems and leaves, hindering the photosynthesis and water metabolism of weeds, causing physiological dysfunction and death.
The herbicide bentazone is mainly used to control double-leaf weeds, paddy field sedges and other single-leaf weeds, so it is a good herbicide in rice fields. It can also be used to weed wheat, soybeans, cotton, peanuts and other dry field crops, such as duckweed, cow's wool, three-edge grass, water sedge, pigweed, polygonum, flat canegrass, wild water chestnuts, amaranth, pigweed , Jiejie grass, etc. The effect is good when used on hot and sunny days, and vice versa. The dosage is 9.8~30g (active ingredient)/100m2. For example, if weeding in rice fields occurs 3 to 4 weeks after planting, and weeds and sedges emerge and merge to the 3 to 5 leaf stage, use 48% liquid agent 20 to 30 mL/100 m2 or 25% aqueous agent 45 to 60 mL/100 m2, and add 4.5% water. kg, when applying the pesticide, drain the field water, choose a sunny day with high temperature and no wind, apply the pesticide evenly on the stems and leaves of the weeds, and then re-irrigate for 1 to 2 days, which can control sedge weeds and broad-leaf weeds. Not effective against barnyardgrass.
Bentazone (25057-89-0) is suitable for crops and control objects
The herbicide bentazone is suitable for soybeans, rice, wheat, corn, and peanuts. It can effectively control cocklebur, Amaranthus retroflexus, Amaranthus amaranth, Amaranthus amaranth, Artemisia spp., Amaranthus aeruginosa, Thistle, Wolfgrass, Amaranth, Polygonum sorrel, Polygonum willowe, Polygonum lucidum, Purslane, endive, wild watermelon seedlings, pigweed, pepper grass, wild radish, salsandra, spiny alfalfa, chickweed, datura, pigweed, pigweed, nightshade, duckweed (1 ~2-leaf stage), ragweed, shepherd's purse, cabbage, convolvulus, mustard, chrysanthemum, wild mustard and other broad-leaf weeds, as well as yujiuhua, duckweed, white water star anise, and grass in paddy fields. , ox felt, firefly, special-shaped sedge, flat-stemmed vine grass, Japanese vine grass, vitex trigonatum, wolfberry, arrowroot, dwarf arrowhead, Alisma, water onion, water sedge, commelder grass, etc. For perennial weeds, only the above-ground stems and leaves can be controlled, but the roots cannot be killed.
Bentazone (25057-89-0) application fields and usage technology
1 rice
Due to years of use of sulfonylurea and amide herbicides in rice fields, broadleaf weeds quickly become resistant to them, and dryland weeds gradually enter paddy fields. At present, the main ingredients of high-efficiency herbicides include bentazone, oxadiazon, oxatrione propinyl, mesotrione and other compounds that have no cross-resistance with sulfonylureas. In Northeast China, refractory weeds that are mainly resistant to sulfonylureas are Grasses include: Yujiuhua, Arrowhead, Longpetaled Arrowhead, Alisma, Fireweed, Niu Fei, etc. The main refractory weeds resistant to sulfonylureas in the Yangtze River and the south include: duckweed, amaranth, moshangcai, jiejiecai, etc. Bentazone can be used in both direct seeding fields and rice transplanting fields to control three-edge grass and broad-leaf weeds. Be sure to wait for the weeds to emerge and drain before spraying. Spray evenly on the stems and leaves of the weeds, and irrigate after two days. The effect is significant. , otherwise it will affect the efficacy of the medicine. Bentazone is safe for rice, but the cost is high. It is often mixed with 2-methyl-4-chloride in production. Generally, half of the usual dosage of each can ensure the efficacy, improve safety, and reduce costs.
How to use: Rice dry rice seedling cultivation and wet rice seedling cultivation fields: 100~150 mL/acre. Rice transplanted fields and direct-seeded rice fields: 166 to 200 mL/acre. Recommended mixing: 48% bentazone 150-200 mL + 25% quinclorac 70-100 mL or + 96% Hedazhuang 150-200 mL or mixed with Daojie, Qianjin, etc.
Application period: Early post-emergence period, when weeds have 2 to 6 leaves. The 2 to 3-leaf stage of rice in the seedling field is 20 to 30 days after transplanting and 30 to 40 days after sowing in the direct seeding field. Drain water before applying pesticides so that all weeds are exposed to the water. Spray on high temperature, windless and sunny days. The pesticide can penetrate into the weeds 4 to 6 hours after application. Fill the fields with water 1 to 2 days after application and retain the water for 1 week.
2 Soybeans and other leguminous crops
2.1 Soybeans
The application period of the herbicide bentazone in soybean fields is the 1 to 3 compound leaf stage after soybean seedlings and the 3 to 5 leaf stage of broadleaf weeds. Use 100 to 200 mL of 48% bentazone per acre. In soybean fields with repeated cropping in Northeast China, the occurrence of broadleaf weeds is more serious than that of grasses. As the number of repeated cropping years increases, the damage of malignant weeds such as commelina, endive and amaranth increases, resulting in a situation dominated by broadleaf weeds. Dominant weed populations. Broad-spectrum herbicides such as imazethapyr and clomazone can be used in areas under continuous soybean cropping, but these two agents are not recommended in areas under crop rotation. The most common herbicide formula in Northeast soybean fields: Quizalofop + Clomazone + Fomesafen (Jingguanghu). Because of the presence of clomazone, it has a great impact on the subsequent crop. Large dosages will have a negative impact on the subsequent crop. Wheat, corn, and sorghum will all be affected, and sunflower, sugar beet, and cabbage will be more serious. Since bentazone has no soil residue and is safe for subsequent crops, the formula of quizalofop + bentazone + fomesafen is used. The residual problem is less severe than that of Quizalofop + Clomazone + Fomesafen (Jingguanghu). The actual formula can reduce the content of Fomesafen, which is of great benefit to crop improvement. In recent years, the use of bentazone in soybean fields has increased because of its special effect on cocklebur. It is used more in areas where cocklebur occurs more frequently. 48% of bentazone used to control cocklebur uses 67 to 133 mL per mu. . In order to expand the herbicidal spectrum, bentazone can be mixed with fomesafen, acifluorfen, etc., and the dosage of each can be halved, and then mixed with herbicides for controlling grass weeds. It is safer for soybeans than acifluorfen and acifluorfen.
At the same time, it should also be pointed out that the post-emergence herbicides such as clomazone, bentazone, and fomesafen in soybean fields have poor conductivity and low dosage, making perennial weeds such as amaranth, horsetail, and endive the main species. Weed communities. At present, chlorosulfentrazone has good control effect on commelina, acanthus, endive, etc.
2.2 mung beans
The herbicide bentazone can be used in mung bean fields. The herbicide is applied at the 3 compound leaf stage of mung bean seedlings. 48% bentazone aqueous solution 100 to 200 mL + quizalofop 60 mL per mu is used to control sedges and some species such as trigonellae. For broadleaf weeds, damage to leaves can be recovered within 2 weeks after treatment. This drug is used in dry fields. It is mainly absorbed by the leaves of weeds and exerts its effect. It should be applied when the weeds in the field are basically all out and have a certain growth amount. When used to control weeds such as trigonellae, a higher concentration should be used. Dosage. Different mung bean varieties have certain differences in their sensitivity to bentazone. It is recommended that the drug be used on a large area after a successful trial in a small area.
2.3 broad beans, peas
During the 3 true leaf stage of peas, you can use 48% bentazone aqueous agent 100-166 mL/acre to spray weeding at the 3- to 5-leaf stage of broadleaf weeds. It cannot be used when the temperature is too low. It is recommended to do a variety resistance test before use (there is a safety hazard for broad beans under drought conditions).
2.4 Leguminous forage
48% bentazone aqueous solution 100-200 mL/acre. Alfalfa and clover (alfalfa) have good resistance to bentazone. For newly planted alfalfa, the pesticide should be applied after the third true leaf is formed; for the second crop of alfalfa, the pesticide should be applied when the height is 5 to 10 cm.
3 Corn and corn interplanting
Due to the large-scale use of pre-emergent amide herbicides and post-emergent nicosulfuron herbicides in corn fields for many years, the growth of weeds was artificially selected. Some previously uncommon broadleaf weeds and sedges have grown stronger and stronger, and fragrant grasses have become more and more popular. Malignant weeds such as aconite, field bindweed, acanthus, purslane, and endive are constantly emerging. Contact herbicides such as bentazone and pentrazone are very active against weeds that are resistant to sulfonylurea herbicides. At the same time, their half-life in the soil is only a few hours, making them very safe for the next crop.
In addition, conventional post-emergent herbicides in corn fields cannot be used, but bentazone can be used. This is because grasses and leguminous plants are highly resistant to bentazone and can degrade bentazone absorbed into the body into Detoxification occurs through metabolism of less active sugar conjugates, which are not present in sensitive weeds. This conjugation effect of inherent unique potential ensures that bentazone is highly safe for current crops. This feature is not available in other corn field herbicides. Use bentazon to control broadleaf weeds and sedges after corn is interplanted with soybean seedlings. It is recommended to use 48% bentazon aqueous solution at 150-200 mL/acre.
4 wheat
The commonly used formula for removing broadleaf weeds in wheat fields is "benzyl mixture", which is a mixture of bentazone (formerly known as bentazon) and 2-methyl-4-chloride. It is used for spraying stems and leaves to control a variety of annual broadleaf weeds in winter wheat fields. Leaf weed. At present, there are several registered mixtures of 2-methyl-4-chloride and bentazone in China, and the ratios of 2-methyl-4 chloride and bentazone are somewhat different. The safety of 2-methyl-4 chloride on crops such as rice and wheat is relatively poor. Appropriately reducing the dosage of 2-methyl-4 chloride and increasing the dosage of bentazone will help improve the safety of crops while ensuring the weeding effect. Due to the high price of bentazone, products using incremental use of bentazone generally have relatively high prices. In the south, during the 2-leaf, 1-core to 3-leaf stage of wheat, 100-122 mL of 48% bentazone aqueous agent is used per acre with 30-40 kilograms of water to control broadleaf weeds such as pigweed and wheatgrass. In the north, pesticides are applied on broadleaf weeds at the 2-4 leaf stage after wheat seedlings, and are often mixed with 2-methyl-4-chloride. Note: Bentazone is not effective in weeding at low temperatures. When applied to control weeds in wheat fields in December, it has basically no weeding effect. Apply pesticides in spring, such as in March, for better weeding effects.
5 peanuts
For weeding in peanut fields, pesticides can be applied at the 2- to 5-leaf stage of weeds. Use 48% bentazone aqueous agent at 133-200 mL/mu, add 30 kg of water, and treat stems and leaves to control broad-leaf weeds such as Amaranthus retroflexus and Amaranthus retroflexus in peanut fields. Purslane and sedge have very good effects. Bentazone has no impact on peanut safety or yield. It can be used at any growth stage of peanuts, but early use is more effective and economical. To control Cyperus rotundus in peanut fields, Bailongtong (240 g/L methimazole nicotinic acid aqueous solution) has the best effect, but the residual effect period is relatively long. Next is Bentazone, but it does not kill the roots. Duckweed in peanut fields is a relatively difficult weed to control. Fomesafen can kill the 3-leaf weeds, while Bentazone has a fair effect on young ones. Note: The dosage of 48% bentazone aqueous agent is ≥200 mL/acre, which is easy to cause phytotoxicity to peanuts, manifested as burning dry patches on the leaves, and serious
The leaves dry up and fall off, which has no adverse effects on the new leaves of peanuts.
6 potatoes
To control broadleaf weeds in potato fields, soil sealing treatment should be carried out mainly after sowing and before emergence by using drugs such as oxyfluorfen, pendimethalin, and acetochlor. During the potato growth period, there is no safe and effective drug to control broadleaf weeds. If you have experience in using drugs, you can consider using proposulfuron and bentazone for weeding.
Controlling broadleaf weeds in potatoes: After potatoes are sown and before emergence, it is generally blocked with subatrione, and the effective ingredient dosage per mu is 17 to 30 g. Use bentazone to control post-emergence. Apply the pesticide when the potato plant height is 10 to 15 cm. The dosage per mu is 130 to 150 mL of 48% bentazone aqueous solution. Note: Resistances vary widely among different potato varieties. Plot trials need to be arranged on crops with no experience in use.
7 white melon
(1) Pre-emergence closed grass and double eradication, use 960 g/L refined metolachlor EC 140 g + 75% thifensulfuron WG 1.5 g per mu.
(2) Post-emergence control of broadleaf weeds, use bentazone and clethodim combined with broadleaf weeds.
8 onions, garlic
Apply when the onion or garlic plant is in the "whip stage" (the latest leaves are drooping) or when the transplanted onion and garlic have taken root and weeds have appeared. Use 100-166 mL of 48% bentazone aqueous agent per mu. Note: New onion varieties and garlic seedling fields need to be tested for drug resistance.
9 sesame seeds
When a large number of broadleaf grasses occur in the sesame seedling stage, you can try fomesafen and bentazone, but improper use can easily cause phytotoxicity. You can try it out on a small area and then promote it.
10 Chinese medicinal materials
Due to the large-scale planting of some Chinese medicinal materials, the sales of bentazone are constantly increasing. To control broadleaf weeds such as cocklebur and purslane in fields of traditional Chinese medicinal materials such as astragalus and perilla, 48% bentazone aqueous agent 100 to 150 mL/acre can be used. To control broadleaf weeds in mint and spearmint fields, after the first crop of mint and spearmint has been harvested, and the second crop has grown, and the weeds are in the 3-5 leaf stage, 100 mL of 48% bentazone water can be used per mu. .
11 lawn
For newly sown lawns, pesticides can be applied when the lawn seedlings are at least 2-leaf stage. Do not mow the lawn 3 days before applying the pesticide, fertilize and irrigate properly, and spray again 7 to 10 days after the pesticide is applied if necessary. Use 133 to 266 mL of 48% bentazone aqueous agent per mu. To control Cyperus rotundus and Cyperaceae weeds, the dosage needs to be increased appropriately.
SWOT analysis of bentazone (25057-89-0)
Strengths analysis
The herbicide bentazone has a wide audience because it can be used in both rice and soybeans. Both formulation factories and dealers are willing to promote bentazone.
Bentazone has good safety, is safe for rice and soybeans, and has no impact on subsequent crops. It is a snake oil product in the terminal application process.
Weaknesses analysis
At present, the price of the herbicide bentazone is still relatively high, and the price/performance ratio is slightly lacking. The price of bentazone water has been below 30,000 for a long time. After the closure of Lulilai, the price continued to remain high, which affected its usage.
In the soybean field, the competition for fomesafen has been fierce in the past few years, and the price has been low; the rice field products have also been in a state of decline, but the price of bentazone has remained fluctuating, and the cost-effectiveness advantage is not obvious.
Opportunities analysis
From a promotion point of view, the herbicide bentazone has the potential to become a large-volume single product. Many domestic companies have added new production capacity, and it is expected that there will be a greater chance of price decline in the future.
The soybean planting area has increased sharply. In recent years, there has been too much rainfall in the Northeast. Fomesafen can easily cause phytotoxicity, so Bentazone aqueous agent is a good choice.
In terms of use in paddy fields, the combination of the herbicide bentazone and grass weed control has been explored. Currently, the combination with dimethyl tetrachloride is more cost-effective, but if we continue to innovate after many years of use, the new product will add bentazone. There are still certain opportunities in the market for its cost-effectiveness.
Threats analysis
There are too many products from small factories in the bentazone series market, which has seriously affected the marketing efforts of this product in the market. The impact of low-priced supply on the market has caused damage to leading companies. If the leading companies use less, it will be very detrimental to the promotion of the product.
Impact of new products on bentazone. The launch of the Linsco series resulted in a significant reduction in the use of bentazone in paddy fields in the past two years, and the demand in soybean fields has been suppressed by fomesafen.
Overall, bentazone is indispensable for weeding in paddy fields and soybean fields. However, according to interviews and surveys, most of the preparation factories selling bentazone aqueous agent are not very profitable. On the one hand, irregular low-priced goods and low-quality goods have impacted the market. The seriousness of the market has led to low profit points; on the other hand, the price of domestic raw materials or large packaging of 480 g/L aqueous solution fluctuates by more than 10% every year, causing preparation companies to suffer cost losses whether they receive goods or collect payments.
In the later period, as the factory operation becomes stable and the foreign trade export volume gradually stabilizes, it is believed that the price of bentazone will fluctuate within a reasonable range and the sales of bentazone will also show a good trend.
Bentazone (25057-89-0) preparation registration
Judging from the number of registered preparation products, there are 176 registered products of bentazone, including 95 single doses and 81 mixtures; 175 are of low toxicity and 1 is of medium toxicity. The registered product was a 25% aqueous agent, followed by sporadic product registrations. The number of registrations increased significantly from 2007 to 8, and climbed to 18 in 2008. In 2009, product registrations were very popular, with 27 products, accounting for 50% of the total number of registrations. 15.34%. From 2012 to 2018, the number of registrations ranged from 8 to 25. There were no product registrations in 2019. After 2020, product registrations entered an upward channel again.
From the perspective of product registration dosage forms, among the 176 registered bentazone preparation products, there are a total of 11 dosage forms in terms of dosage form categories. The number of registered liquid preparations (AS) ranks first, with 126 products. Solution (SL) is followed by the number of registrations, with 22, followed by microemulsion (ME), emulsifiable concentrate (EC), soluble powder (SP), dispersible oil suspension (OD) and water-dispersible granule (WG). There are 10, 5, 4, 3, and 2 registrations respectively. The registration numbers for the remaining dosage forms, such as suspension concentrate (SC), wettable powder (WP), soluble powder (SP), and liquid are all 1 indivual.
Judging from the registration of mixture products, among binary compound formulation products, 2-methyl-4-chloride compounded with phenoxycarboxylic acid herbicides is the most common, with 37 products accounting for 55.22% of the total number of registered binary compound formulations. Others There are 11 acifluorfen, 10 fomesafen, 3 oxazofen, 2 bifenfens, and each of mefenacetate, quinclorac, penoxsufen, and quizalofop. 1; among the ternary compound preparation products, there are 10 ternary compound preparations mixed with quizalofop and fomesafen, accounting for 71.42% of the total number of registered ternary compound preparations. One compound preparation each of ether or imazetethyl nicotinic acid, one compound preparation of nicosulfuron mixed with atrazine, and one compound preparation of cyhalofop-al mixed with pyrimidine flufenacet. Binary or ternary compound formulations are a mixture of herbicides with different mechanisms of action on weeds. In addition to contact killing, systemic transport and photosynthesis inhibition, they also inhibit the biosynthesis of amino acids or inhibit the biosynthesis of lipids. It synthesizes or interferes with endogenous hormones. It not only has good quick-acting effect and long-lasting effect, but also has a broad herbicidal spectrum.
From the perspective of product registration crops, bentazone preparation products are registered in 26 cultivation types, including rice (including rice transplanting fields, rice seedling throwing fields, rice fields, rice direct-seeding fields, rice transplanting fields, transplanted rice fields, The number of registrations on 8 cultivation types including direct seeding rice fields) is 117, leading the way, followed by soybeans (including 6 cultivation types including spring soybeans, spring soybean fields, soybean fields, summer soybean fields, and summer soybeans) ) 93, followed by wheat (including winter wheat fields, wheat fields, etc. 3 cultivation types), peanut fields, and potato fields with 7 each. Crops with a registered number of less than 5 include sweet potatoes (including sweet potato fields), There are 4 grassland pastures and tea gardens, 2 corn fields (including summer corn fields), and 1 sorghum field.
Judging from the control targets of product registration, bentazone has been registered in a total of 8 control targets, among which the number of registered broadleaf weeds is 153, which is far ahead, followed by 113 annual broadleaf weeds and 84 Cyperaceae weeds. Next in the list are 66 broadleaf weeds and sedge weeds, 42 annual broadleaf weeds and sedge weeds, sedges and broadleaf weeds, annual broadleaf weeds and some sedges. There were 8 each of weeds and 1 of various annual broadleaf weeds. It can be seen that Bentazone's products focus on the control of broadleaf weeds and sedge weeds. They can only control the above-ground parts of perennial weeds and have no activity on the grass weeds themselves.
Bentazone (25057-89-0) Precautions
The herbicide bentazone should be applied in the morning and evening when the temperature is low and the wind is low. Do not apply on windy days. Ultra-low volume spraying is not possible. Rainfall within 8 hours after application will reduce the efficacy. It is not suitable to be used under extreme drought and waterlogging conditions. To avoid phytotoxicity. To control three-edge grass and broad-leaf weeds in rice fields, spray must be made after the weeds are cleared and drained. Spray evenly on the stems and leaves of weeds and water them after two days. The effect is remarkable. Otherwise, the efficacy of the medicine will be affected. Pay attention to safety protection when taking medicine. If accidentally swallowed. It is necessary to drink salt water to lavage the stomach and induce vomiting. Do not give the patient fat-containing substances (such as milk, castor oil, etc.) or alcohol.
Herbicide bentazone (25057-89-0) price
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