A brief discussion on the application of Bispyribac as a rice herbicide
What is Bispyribac (125401-75-4)?The herbicide Bispyribac is a side chain amino acid synthesis inhibitor. Cas 125401-75-4 is an acetolactase (ALS) inhibitor. It inhibits the biosynthesis of the amino acids valine and isoleucine necessary for plants. Prevents cell division, causing the plant to stop growing. It is a broad-spectrum herbicide that is rapidly absorbed through leaves and roots and rapidly transmitted to the entire plant. This product is used to control annual and perennial broadleaf weeds and barnyard grass in direct-seeded and transplanted rice fields. The application rate is 15- 45g/ha.
The herbicide Bispyriba is a rice field herbicide that is particularly effective against barnyard grass and paspalum distachyon. It can be used to control old barnyard grass and barnyard grass that is resistant to other herbicides.
Bispyribac is a pyrimidine-salicylic acid herbicide and a highly active acetolactate synthase (ALS) inhibitor. After application, it can be quickly absorbed by the stems and leaves of weeds and transmitted to the entire plant, inhibiting the growth of plant meristems and thus killing weeds. This agent is highly efficient, broad-spectrum, and has a very low dosage. It can effectively control barnyardgrass and other grassy weeds in rice fields. It can also control most broadleaf weeds, some sedge weeds and barnyardgrass that are resistant to other herbicides. Such as: barnyardgrass, paspalum, ricegrass, crabgrass, stoloniferous bentgrass, wheatgrass, Northeast sweetgrass, wolfberry, special-shaped sedge, sunshine scoop grass, broken rice sedge, Firefly, Japanese grass, flat-stemmed acanthus, duck tongue grass, rainflower, wild arrowhead, Alisma, anthurium, glutinous rice grass, cow's wool felt, knotweed, moshangcai, water bamboo leaves, hollow Most common weeds in paddy fields, such as lotus seedgrass and flowerweed. It is particularly effective against older barnyard grass and Paspalum bitachyon, and can kill barnyard grass at the 1 to 7-leaf stage. In farmland ecosystems, plants other than rice and some sedges are sensitive to it to a certain extent.
Physicochemical Properties of Bispyribac(125401-75-4)
The appearance of herbicide Bispyribac is white powder, melting point 223~224℃, vapor pressure 5.05*10-9Pa (25), bulk density 0.0737 (20℃), solubility: water 73.3g/L (25℃), methanol 26.3 g/L, acetone 0.043g/L (25℃).
Bispyribac (125401-75-4) animal toxicity
The herbicide Bispyribac is low in toxicity. The acute oral LD50 in rats is >5000 mg/kg, and the acute transdermal LD50 is >2000 mg/kg. The acute oral LD50 of the preparation in rats is 5840 mg/kg for females and 4300 mg/kg for males, and the acute dermal LD50 is >2000 mg/kg. No irritation to skin, slight irritation to eyes.
Environmental impact of Bispyribac
LC50 rainbow trout and bluegill sunfish >100ppm, Daphnia LC50 (48h) >100ppm; acute oral LD50 quail >2250mg/kg, eating LC50 (5d) quail, mallard >5620mg/kg food; bee LD50 oral >200μg /bee, LC50 exposure>70000mg/L.
Commonly used dosage forms of Bispyribac(125401-75-4)
10% Bispyribac suspension agent, 20%Bispyribac ether wettable powder.
Scope of use of Bispyribac(125401-75-4)
Difenfenfen belongs to the pyrimidine-salicylic acid herbicides, also known as dipyrfenfen. It is a highly active acetolactate synthase (ALS) inhibitor. It can be quickly absorbed by the stems and leaves of weeds after application, and is transmitted to the entire plant, inhibiting the growth of plant meristems, thereby killing weeds. Highly effective, broad spectrum, and extremely low dosage. It can effectively control barnyardgrass and other grassy weeds in rice fields, and can also control most broadleaf weeds, some sedge weeds and barnyardgrass that are resistant to other herbicides, such as barnyardgrass, paspalum distachyon, and rice plum. Grasshopper's grass, crabgrass, stoloniferous bentgrass, wheatgrass, sweetgrass, wolfberry, special sedge, sunshine sedge, broken rice sedge, firefly, Japanese grass, flat-stem strawberry, duckweed Glossula, Yujiuhua, wild arrowroot, Alisma, eyewort, glutinous rice grass, cow's wool felt, knotweed, moshangcai, water bamboo leaves, hollow lotus seed grass, flower lining and other common plants in rice fields. Some weeds. It has special effects on older barnyard grass and paspalum bitachyon, and can kill barnyard grass in the 1 to 7-leaf stage.
Bispyribac (125401-75-4) control targets
The herbicide Bispyribac effectively controls rice field barnyard grass and other grass weeds, and also controls most broadleaf weeds, some sedge weeds and barnyard grass that are resistant to other herbicides. Such as: barnyardgrass, paspalum, ricegrass, crabgrass, stoloniferous bentgrass, wheatgrass, Northeast sweetgrass, wolfberry, special-shaped sedge, sunshine scoop grass, broken rice sedge, Firefly, Japanese grass, flat-stem grass, duckweed, rainflower, wild arrowhead, Alisma, eye cabbage, millet grass, cow's wool, tamarind, mosang, water bamboo leaves, hollow lotus seeds Most of the common weeds in rice fields are grasses and weeds.
It has special effects on older barnyard grass and paspalum bitachyon, and can kill barnyard grass in the 1-7 leaf stage.
Bispyribac (125401-75-4) mechanism of action
Bispyribac is a pyrimidine-salicylic acid herbicide and a highly active acetolactate synthase (ALS) inhibitor. After application, this product can be quickly absorbed by the stems and leaves of weeds and transmitted to the entire plant, inhibiting plant growth. Meristems grow, killing the weeds. Highly effective, broad spectrum, and extremely low dosage.
The best period of use of Bispyribac (125401-75-4)
The direct seeding field should be used after the three leaves of the rice have been harvested, otherwise it will have adverse effects on the rice. It should be used before the five leaves of rice are harvested. Otherwise, the grass age in the field will be too large, which will lead to increased control costs or poor control effects. In transplanting fields (machine transplanting, throwing seedlings, hand transplanting), pesticides should be applied about 15 days after transplanting, after the seedlings turn green. It is forbidden to use Bispyribac oxane during the booting stage of rice.
When using 10% bislopyr oil suspension agent (prepared), the temperature is required to be no less than 15 degrees. Especially for early rice, attention should be paid to changes in the temperature difference between day and night and the weather conditions 5-7 days after application. The optimal temperature for Bispyribac is between 20 degrees and 25 degrees, and the weed death time is about 15 days. The temperature is stable, there is no rain within 5 days after application, and obvious effects can be seen on weeds in 7 days. If heavy rain occurs within 5 days after application, be careful not to let the water flood the rice core leaves to avoid adverse effects.
How to use Bispyribac (125401-75-4)
Direct-seeded rice fields: This product can be used after the emergence of direct-seeded rice and before heading. It has the best effect when applied at the 3-5 leaf stage of barnyard grass. For direct-seeded rice fields, use 18-24 grams of 20% Bispyribac wettable powder per acre, mix with 25-30 kilograms of water, and spray weed stems and leaves evenly.
Transplanting or throwing fields: In rice transplanting fields or throwing fields, pesticides should be applied 15 days after transplanting or throwing, and after the seedlings turn green to avoid premature application of pesticides and poor drug resistance of the seedlings, resulting in phytotoxicity. Use 12-18 grams of 20%Bispyribac wettable powder per acre, mix with 25-30 kilograms of water, and spray the weed stems and leaves evenly. Drain the field water before applying the pesticide to expose all the weeds. Irrigate the field 1-2 days after the pesticide application and maintain a 3-5 cm water layer for 4-5 days.
Bispyribac (125401-75-4) uses
1 The herbicide Bispyribac is a pyrimidine-salicylic acid herbicide and an acetolactase inhibitor. It works by inhibiting the biosynthesis of branched-chain amino acids and is suitable for rice crops. It is mainly used for post-emergence weeding of direct-seeded rice. It is effective against barnyard grass at the 1 to 7-leaf stage, and is especially effective at the 3- to 6-leaf stage. It also has a good control effect on plantain, grassgrass, Arabian sorghum, purple water amaranth, commelder grass, melon grass, special sedge, sedge, crabgrass, firefly, bacopa, and corngrass. This product has stable effects on most soils and climate environments and can be mixed with other pesticides.
2 The herbicide Bispyribac is used to control grass weeds and broadleaf weeds such as barnyard grass in rice fields. It can be used in rice fields, direct seeding fields, seedling transplanting fields and seedling throwing fields.
3 The herbicide Bispyribac is a super-efficient, broad-spectrum, low-toxic herbicide. It is mainly used to control grass weeds and broad-leaf weeds such as barnyard grass in rice fields. It can be used in rice fields, direct-seeded fields, and seedling transplant fields. Used in seedling throwing fields.
Bispyribac (125401-75-4) use
1 Strictly control the application period and dosage
Due to the extremely high activity of Bispyribac, the application period must be strictly controlled. The appropriate period for the use of Bispyribac in rice is the 4-6 leaf stage of rice, and whether it is japonica or indica rice varieties, it is generally applied after the 5-leaf stage. After the 5-leaf stage, rice's ability to degrade Bispyribac is significantly enhanced, and its safety is greatly improved. When used before the fourth leaf of rice, it is easy to cause phytotoxicity due to small and weak seedlings. The recommended dosage of 100 g/L Bispyribacibac is 20-30 mL/667 m2. Due to the compound resistance of Bispyribac and quinclorac, the actual application amount in some areas should be 30 to 40 mL/667 m2. However, for areas where it has not been used before, the principle of testing first and then promotion should be followed, and verification should be carried out cautiously. The application amount should not be too large (generally the active ingredients should be controlled below 5 g/667 m2). If it exceeds the 6-leaf stage, it is prone to phytotoxicity and should be used with caution.
2 There are differences in the selectivity of diclofenac to different rice varieties, and the varieties used need to be strictly controlled
There are differences in the selection of the herbicide Bispyribac on different rice varieties. The differences in its safety for different rice varieties and different leaf stages are mainly caused by differences in the metabolic capabilities of the important metabolic enzyme GST in the plant. This difference is manifested in the increasing sensitivity of indica rice, hybrid rice, japonica rice, and glutinous rice to Bispyribac. The variety safety is: indica rice>hybrid rice>japonica rice>glutinous rice. In application, whether indica or japonica rice is used before the three-leaf and one-heart stage, there will be chlorosis; if it is used after the three-leaf and one-heart stage, indica rice is safe, while japonica rice must be used after the five-leaf stage. In the case of weak seedlings in the field, sudden changes in temperature, and high application rates, chlorosis will occur within 3 days of application, and will generally return to green in 7 to 10 days. In the promotion guidance, glutinous rice is not recommended. Indica rice and hybrid rice need to be adjusted to the appropriate dosage and application period based on the regional planting varieties.
3. Strictly control the dosage of pesticides and water, and select appropriate equipment for scientific spraying.
100 g/L herbicide Bispyribac is used in direct-seeded fields. According to the Ministry of Agriculture registration, the use is 20 to 30 g per 667 m2. This is the dosage during the best period of medication (3 to 5 leaves of barnyard grass). If the leaves of barnyard grass are older, the dosage needs to be increased appropriately. The reasonable dosage should be determined according to the specific situation of barnyard grass (the active ingredients need to be controlled at 5 g/667 m2). The amount of water used for spraying should be sufficient, generally 30 to 45 kg, and not less than 30 kg (to prevent the concentration of the chemical solution from being too high, which may cause phytotoxicity to the seedlings). When it comes to spraying equipment, manual sprayers are generally chosen instead of motorized mist sprayers (this also prevents the concentration of the liquid from being too high and causing damage to the seedlings). When spraying, the spray should be even, without repeated spraying (to prevent the dosage per unit area from being too high) and without leakage (if the spray is not sprayed, the effect will be poor).
4 Pay attention to temperature changes and strictly control the weather
The suitable application temperature range for the herbicide Bispyribac is between 15 and 45°C. Within the appropriate temperature range, the control effect of Bispyribac on weeds increases linearly as the temperature increases, and the safety becomes better. When the temperature is lower than 15°C, the control effect of Bispyribac is unstable. At the same time, the physiological metabolism level of rice decreases, which increases the probability of phytotoxicity. In the southern region, especially in the rice areas of the middle and lower reaches of the Yangtze River, the temperature changes greatly during the early rice application period, so its use is not recommended. If used (in May), pay attention to temperature changes. Do not use it if it is below 20°C, otherwise it is easy to cause phytotoxicity.
The natural degradation of the herbicide Bispyribac is also related to temperature. As the temperature increases, the degradation rate of Bispyribac increases and the half-life shortens. For every 10°C increase in temperature, the hydrolysis rate of Bispyribac increases by 1.6 times. Therefore, high temperatures should be avoided when storing Bispyribac. Although the application of Bispyribac at high temperature is beneficial to the efficacy of the drug, it may also shorten its efficacy period and reduce the control effect. At the same time, due to high temperature (above 35°C), water evaporates quickly, and it is easy to cause phytotoxicity.
5. Strictly follow the medication principle of “drain first, apply medication later, and then rehydrate” to ensure the efficacy of the medication.
Before applying pesticides, the accumulated water in the field needs to be drained to expose the weeds and keep the field moist. 2 days after application, rehydrate and maintain a shallow water layer for 5 days (the water layer cannot submerge the heart leaves to avoid phytotoxicity), and then carry out normal field water management. Tests have shown that drainage first and then rehydration have a great impact on the efficacy of Bispyribac. In addition, the safety performance of diclofenac in dry direct-seeding fields is better than that in water direct-seeding and transplanting (machine-transplanted) fields. Therefore, attention should be paid to the depth of the water layer in the field and not to submerge the core leaves to avoid phytotoxicity.
6 Pay attention to the pH value of the environment to avoid affecting the control effect of Bispyribac
As the pH value continues to decrease, the degradation rate of Bispyribac continues to increase. In practical applications, for the three commonly used fertilizers, potassium dihydrogen phosphate, ammonium bicarbonate, and urea, the degradation rate of bisspyr is increased due to the dissociation of H+ from potassium dihydrogen phosphate. On the contrary, the aqueous solution of ammonium bicarbonate and urea is Being alkaline, the drug's effect lasts longer. At the same time, different soils and differences in organic matter content and pH also affect the degradation rate of Bispyribac, thus affecting the control effect to a certain extent.
7 Understand the basic characteristics of pharmaceuticals and effectively solve field problems not caused by the pharmaceuticals themselves
Bispyribac is a pyrimidine-salicylic acid herbicide and a highly active acetolactate synthase (ALS) inhibitor. After application, it can be quickly absorbed by the stems and leaves of weeds and transmitted to the entire plant, inhibiting plant meristemization. The tissue grows, thereby killing the weeds. The dosage of Bispyribacofen is extremely low. Due to the variety, period of use, weather (temperature, rainfall), premature excessive use, heavy spraying, mist machine spraying and other human-induced improper use, it will cause chlorosis, yellowing, and plant growth. Dwarf, the root system becomes shorter, and when the damage is severe, symptoms of plant death may even occur. In this regard, stimulating plant growth regulators such as Bihu, brassinoids, gibberellin (920), zeatin, and indole acetic acid can be used. Spray evenly with foliar fertilizers and micro-fertilizers to regulate growth, reduce phytotoxicity and restore growth. Indica rice and hybrid rice recover naturally after 5 to 7 days of yellowing, without affecting yield.
It has been observed that the inhibitory effect of Bispyribac on rice ALS has the following rules: at a reasonable dosage, Bispyribac has basically no inhibitory effect on indica ALS after the 5-leaf stage. Its inhibition of ALS in japonica rice reaches its peak at 5 days, then gradually decreases, and there is basically no inhibition at 9 days. The field performance is that japonica rice begins to turn yellow and chlorosis after 3 days of application, and then begins to recover and turn green after 10 days. This short-term suppression in japonica rice has no effect on the final yield. Explanations should be made for areas where Bispyribac is used for the first time.
8. Rotate use and compound use to reduce resistance and extend product life.
As the use of herbicides prolongs, the problem of weed resistance will become more and more prominent. Herbicides in our country often use a certain type of herbicide with the same target for a long time. In addition, farmers are not sure about the concentration and application period during use, which can easily cause weeds to develop resistance and cause changes in the weed community. Rotating the use of different types, different methods, and different target herbicides can reduce the occurrence of Bispyribac resistance. Before barnyard grass emerges, pre-emergence herbicides can be used to effectively seal the barnyard grass to reduce the use of Bispyribac; during the post-emergence growth period, barnyard grass can be used in rotation or alternately with penoxsulam, sedge phosphorus, quinclorac, etc. to further improve the effectiveness of barnyard grass. Extend product life. At the same time, it can be used in combination with cyhalofop, quinclorac, penoxsulam, bensulfuron-methyl, pyrazosulfuron-methyl and other varieties, which can not only reduce the dosage of Bispyribac, but also improve the safety of bispfen , and can expand the herbicide spectrum and improve the comprehensive control effect.
Mixing of Bispyribac(125401-75-4)
The main control targets of the herbicide Bispyribac are barnyard grass (except blue barnyard grass), rice grass, and paspalum bitachyon, but it has poor control effect on broad-leaf grass, sedge, and steppegrass. Usually field grasses are relatively complex, and Bispyribac alone cannot completely control all weeds in the field. Therefore, it needs to be mixed with other herbicides to achieve the purpose of killing multiple weeds in one application.
Barnyard grass and Qianjin mixed crop fields (usually such grasses are direct-seeded fields) 10% bifenthrin oil suspension (completely prepared) 40-60 grams/acre + 30% cyhalofop-ethyl emulsifiable concentrate (Tao Zhilian) 1 00ml/acre.
Barnyard grass and broad-leaf grasses (including duckweed, rainflower, wild arrowroot, Alisma, angustifolia, tamarind, and moss) are mixed in the fields. This kind of grass phase usually occurs in transplanted fields. (Throwing seedlings, machine planting, hand planting), of course, such grass patterns also appear in live broadcast fields. 10% Bispyribac oil suspension (completely prepared) 40-60 g/mu + 10% pyrazosulfuron-methyl 10 g.
Barnyard grass and water chestnuts (Hydrocarpa) are mixed in the fields. Such grass-phase transplanted fields and direct-seeded fields may occur. 10% Bispyribacopyr oil suspension (completely prepared) 40-60 g/mu + fluopyrin EC 20 ml/mu.
Barnyard grass, stephania, and sedge (trichophylla, cyperus rotundus) are mixed in fields, usually in direct-seeded fields, but also in transplanted fields. 10% Bispyribacoxyfen oil suspension (completely prepared) 40-60 g/mu + 30% cyhalofop-ethyl emulsifiable concentrate (Daozhilian) 100 ml/mu + 480 g/L bentazone aqueous agent 100 ml/mu.
Precautions for Bispyribac(125401-75-4)
1. Strictly control the application period and application amount
Due to the extremely high activity of Bispyribac the application period must be strictly controlled. Both japonica and indica rice varieties should be applied after the 5-leaf stage. Although some manufacturers claim that Bispyribac can be used at the 3-leaf stage (seedling stage) after adding special additives, this promotion method still lacks sufficient verification. After the 5-leaf stage, the rice's ability to degrade Bispyribac is significantly enhanced, and its safety is greatly improved. The recommended dosage per mu of 100g/L Bispyribac is 20mL-30mL. Due to the compound resistance of Bispyribac and quinclorac, the actual application amount in some areas is 30mL-40mL. However, for areas where it has not been used before, the principle of testing first and then promotion should be followed, verification should be carried out carefully, and the application amount should not be too large.
2. There are differences in the selectivity of diclofenac to different rice varieties
There are differences in the selection of Bispyribac on different rice varieties. The differences in the safety of Bispyribac on different rice varieties and different leaf stages are mainly caused by differences in the metabolic capabilities of the important metabolic enzyme GST in the plant. This difference is manifested in the increasing sensitivity of indica rice, hybrid rice, and japonica rice (glutinous rice) to Bispyribac. In application, whether indica rice or japonica rice is used before the three-leaf stage, there will be chlorosis. Indica rice is safe when used after the three-leaf stage, while japonica rice must be used after the five-leaf stage. In the case of weak seedlings in the field, sudden changes in temperature, and high application rates, chlorosis will occur after 3 days of application, and it will generally return to green in 10-15 days. In the promotion guidance, the appropriate dosage and application period need to be adjusted based on the regional planting varieties.
3. Pay attention to temperature changes
The suitable application temperature range of Bispyribac is between 15 degrees and 35 degrees. Within the appropriate temperature range, the control effect of Bispyribac on weeds increases linearly as the temperature increases, and the safety becomes better. When the temperature is lower than 15 degrees, the control effect of Bispyribac is unstable. At the same time, the physiological metabolism level of rice decreases, which increases the probability of phytotoxicity. When pesticides are applied under continuous high temperatures above 35 degrees, it is also easy to cause phytotoxicity. In the southern region, especially in the rice areas of the middle and lower reaches of the Yangtze River, the temperature changes greatly during the application period of early rice. Pay attention to the temperature changes when using it and be cautious when promoting it.
The natural degradation of Bispyribac is also related to temperature. As the temperature increases, the degradation rate of Bispyribac increases and the half-life shortens. For every 10 degrees increase in temperature, the hydrolysis rate of Bispyribac increases by 1.6 times. Therefore, high temperatures should be avoided when storing Bispyribac. Although the application of Bispyribac under high temperature is beneficial to the efficacy of the drug, it may also shorten its efficacy period and reduce the control effect.
4. Pay attention to the compound resistance with quinclorac
Literature studies have shown that after quinclorac-resistant barnyardgrass was treated with cyhalofop and bispfen for two consecutive years, it also developed resistance to cyhalofop and bispfen. This resistant barnyard grass population has a complex Drug resistance. In some areas where Bispyribac has been used, we need to pay attention to this and be cautiously optimistic about the field control effect to avoid high inventory due to poor control effect.
5. Drain first, then apply medication, and then rehydrate.
Before applying pesticides, the accumulated water in the field needs to be drained to expose the weeds and keep the field moist. 1 day after application, rehydrate, maintain shallow water layer for 7 days, and then carry out normal field water management. Tests have shown that drainage first and then rehydration have a great impact on the efficacy of Bispyribac. In addition, the safety performance of diclofenac in dry direct seeding fields is better than that in water direct seeding and transplanting (machine transplanting) fields, so attention should be paid to the depth of the water layer in the field.
6. Pay attention to the environmental pH, which affects the control effect of Bispyribac.
As the pH value continues to decrease, the degradation rate of Bispyribac continues to increase. In practical applications, potassium dihydrogen phosphate, ammonium bicarbonate, and urea are three commonly used fertilizers. Since potassium dihydrogen phosphate ionizes to H+, the degradation rate of Bispyribac increases. On the contrary, ammonium bicarbonate and urea are water-soluble and alkaline. The drug effect lasts longer. At the same time, different soils and differences in organic matter content and pH also affect the degradation rate of Bispyribac, thus affecting the control effect to a certain extent.
7. The inhibitory effect of Bispyribac on rice ALS
At a reasonable dosage, Bispyribac has basically no inhibitory effect on ALS in indica rice after the 5-leaf stage. Its inhibition of ALS in japonica rice reaches its peak at 5 days, then gradually decreases, and there is basically no inhibition at 9 days. The field performance is that japonica rice begins to turn yellow and chlorosis after 3 days of application, and begins to recover and turn green after 10 days. This short-term suppression in japonica rice has no effect on the final yield. Explanations should be made for areas where Bispyribac is used for the first time.
Herbicide Bispyribac(125401-75-4) price
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