CN114424772B - Weeding composition containing dithiopyr and halosulfuron-methyl - Google Patents

Weeding composition containing dithiopyr and halosulfuron-methyl Download PDF

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CN114424772B
CN114424772B CN202210162367.8A CN202210162367A CN114424772B CN 114424772 B CN114424772 B CN 114424772B CN 202210162367 A CN202210162367 A CN 202210162367A CN 114424772 B CN114424772 B CN 114424772B
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halosulfuron
methyl
dithiopyr
weeding composition
weeds
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CN114424772A (en
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袁国徽
沈国辉
田志慧
高原
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Shanghai Academy of Agricultural Sciences
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N47/00Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
    • A01N47/08Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
    • A01N47/28Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N<
    • A01N47/36Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< directly attached to at least one heterocyclic ring; Thio analogues thereof
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/34Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom
    • A01N43/40Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom six-membered rings

Abstract

The invention discloses a weeding composition containing dithiopyr and halosulfuron-methyl, belonging to the technical field of pesticides. The weeding composition takes the dithiopyr and the halosulfuron-methyl as effective components, wherein the mass ratio of the dithiopyr to the halosulfuron-methyl is (1-9) to (1-9). The weeding composition prepared by compounding the dithiopyr and the halosulfuron-methyl is applied to the paddy field, the weed control effect is obviously superior to the sum of single-dose theoretical effects, the weed control activity is improved under the condition of reducing the dosage of the active ingredients, and the super-additive effect is achieved.

Description

Weeding composition containing dithiopyr and halosulfuron-methyl
Technical Field
The invention belongs to the technical field of pesticides, and particularly relates to a weeding composition containing dithiopyr and halosulfuron-methyl.
Background
In crop farming, protection of crops by controlling weeds that inhibit the growth of crops is an extremely important means. In order to reduce damage caused by weeds growing in cultivated areas, such as crop growth or yield loss, researchers have developed active herbicidal substances that are effective in controlling weeds and safe for crops. These herbicidally active substances for controlling weeds growing in a cultivated area of a particular crop preferably have a high herbicidal activity and a broad herbicidal spectrum, and are safe to the environment and to the crop.
Dithiopyr belongs to pyridine carboxylic acid herbicides. The herbicide is used for weeding paddy fields and lawns, and can prevent and kill annual weeds such as barnyard grass, monochoria vaginalis, cyperus heterophyllus, arthroncus, alisma angustifolia and the like by applying 0.06kg (a.i.) of/ha before germination and applying 0.12kg (a.i.) of/ha after germination (barnyard grass in the 1.5 leaf stage). But not against firefly rush, hydrocotyle, guapian and Pseudobulbus Cremastrae Seu pleiones. The herbicidal activity of the herbicide is not affected by the change of environmental factors, and the herbicide is safe to rice and has a lasting period of 80 days. The product is applied before lawn germination, the dosage is 0.36-0.50 kg (a.i.)/ha, and can prevent and kill annual gramineous weeds such as red crabgrass and purple crabgrass and annual broadleaf weeds such as white fungus, sedum bulbophyllum and adenophora lentinus.
The halosulfuron-methyl is widely applicable to crops, can be used for wheat, corn, sorghum, rice, sugarcane, tomato, sweet potato, dried bean, lawn and ornamental crops, has special effect on malignant weed cyperus rotundus, and can prevent and remove part of broadleaf weeds. The fresh weight inhibition rate of halosulfuron-methyl on common weeds in paddy fields, such as amaranth, monochoria vaginalis, sedge grass, cyperus rotundus and the like, is over 90 percent, but the halosulfuron-methyl is basically ineffective on grassy weeds.
At present, the herbicide is limited by the safety of crops, the weed control spectrum is limited, the occurrence of weeds in the crops cannot be completely and effectively controlled by singly using a single herbicide, and residual toxicity to peripheral crops or succeeding crops is easily caused by some herbicides due to large water solubility, long lasting period, excessive use amount or uneven application.
Disclosure of Invention
In view of the above, the invention provides a weeding composition containing dithiopyr and halosulfuron-methyl, which has a good control effect on weeds, and has positive effects on the aspects of retarding the resistance of weeds, reducing the dosage of drugs and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
a weeding composition containing dithiopyr and halosulfuron-methyl takes dithiopyr and halosulfuron-methyl as effective components, wherein the mass ratio of the dithiopyr to the halosulfuron-methyl is (1-9) to (1-9).
Further, the usage amount of the dithiopyr and the halosulfuron-methyl is 20-85% of the total mass of the weeding composition.
Further, the usage amount of the dithiopyr and the halosulfuron-methyl is 25-70% of the total mass of the weeding composition.
Further, the dithiopyr, the halosulfuron-methyl and the auxiliary agent are prepared into any formulation allowed in pesticides.
Furthermore, the preparation formulation is wettable powder, missible oil, suspending agent or aqueous emulsion.
The auxiliary agent comprises: water, solvent, filler, various surfactants (emulsifier, dispersant, wetting agent, etc.), adhesive, film forming agent, colorant, antifreezing agent, thickener, suspending agent, disintegrating agent, antifoaming agent, penetrating agent, synergist, stabilizer, wall capsule material, pH regulator, preservative, etc. The adjuvant is selected from ingredients commonly used or allowed to be used in pesticide preparations, and is not particularly limited.
The invention also provides application of the weeding composition in preventing and removing weeds in paddy fields.
Further, the weeds include grasses, broad-leaved weeds and sedge weeds.
Compared with the prior art, the invention has the beneficial effects that:
the weeding composition prepared by compounding the dithiopyr and the halosulfuron-methyl is applied to the paddy field, the weed control effect of the weeding composition is obviously superior to the sum of theoretical effects of single agents, the weeding activity is improved under the condition of reducing the using amount of active ingredients, and the weeding composition has an ultra-additive effect.
The weeding composition prepared by the invention has complementary weeding activity, enlarges the prevention and control spectrum and has long lasting time.
Compared with single-dose herbicides, the herbicidal composition prepared by the invention has the advantages that the use amount of the effective components is reduced, the residual toxicity to peripheral crops or afterculture crops is avoided, and the cost is reduced.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The "parts" described in the following examples are all "parts by mass".
A weeding composition containing dithiopyr and halosulfuron-methyl takes dithiopyr and halosulfuron-methyl as effective components, wherein the mass ratio of the dithiopyr to the halosulfuron-methyl is (1-9): (1-9).
The dosage of the dithiopyr and the halosulfuron-methyl is 20-85% of the total mass of the weeding composition.
The dosage of the dithiopyr and the halosulfuron-methyl is 25-70% of the total mass of the weeding composition.
The dithiopyr, the halosulfuron-methyl and the auxiliary agent are prepared into any formulation allowed in pesticides.
The preparation formulation is wettable powder, missible oil, suspending agent or aqueous emulsion.
The auxiliary agent comprises: water, solvent, filler, various surfactants (emulsifier, dispersant, wetting agent, etc.), adhesive, film forming agent, colorant, antifreezing agent, thickener, suspending agent, disintegrating agent, antifoaming agent, penetrating agent, synergist, stabilizer, wall capsule material, pH regulator, preservative, etc. In order to properly improve the tolerance of crops or promote the growth and development of crops, safety technology or agricultural fertilizers can be properly added. The adjuvant is selected from ingredients commonly used or allowed to be used in the pesticide preparation, and is not particularly limited.
For the preparation of wettable powder, missible oil, suspending agent, or emulsion in water, etc., the preparation can be prepared by using corresponding auxiliary agents according to the method known by the technicians in the field, and the details are not repeated herein.
The pesticide dosage of the invention meets the national pesticide dosage requirement.
Example 1:80% wettable powder
Weighing the following raw materials in percentage by mass: 40% of dithiopyr, 40% of halosulfuron-methyl, 6% of sodium lignosulfonate REAX82P, 8% of light calcium carbonate and the balance of diatomite to 100%.
Example 2:60% emulsifiable concentrate
Weighing the following raw materials in percentage by mass: 45% of dithiopyr, 15% of halosulfuron-methyl, 4% of sodium dodecyl sulfate, 3% of alkylphenol polyoxyethylene and 100% of solvent oil.
Example 3:45% suspending agent
Weighing the following raw materials in percentage by mass: 30% of dithiopyr, 15% of halosulfuron-methyl, 4% of polyoxyethylene sorbitan fatty acid ketone, 3% of alkylphenol formaldehyde resin polyoxyethylene ether, 1% of ethylene glycol and the balance of water to 100%.
Example 4:24% aqueous emulsion
Weighing the following raw materials in percentage by mass: 8% of dithiopyr, 16% of halosulfuron-methyl, 4% of xylene, 3% of calcium dodecyl benzene sulfonate, 4% of dioctyl sodium sulfosuccinate, 2% of glycerol and the balance of water to 100%.
Test example 1
Test for measuring combined toxicity of dithiopyr and halosulfuron-methyl in different ratios
1. Test conditions
1.1 test target
Barnyard grass, herba Monochoriae, and herba Cyperi Pratentis. Collected from paddy fields.
The potting method is adopted. A140 mm by 140mm plastic nutrition pot is placed in a tray, surface soil which is collected from a farmland and is subjected to air drying and sieving is filled in the nutrition pot, water is directly added to the top of the nutrition pot, and the soil humidity is controlled to be in a saturated state at the initial stage. Selecting full and uniform weed seeds, accelerating germination in an incubator (dark) at 25/30 ℃, uniformly placing the weed seeds just exposed to the white on the surface of soil, covering the soil with 0.5cm, keeping the soil fully wet after sowing, and placing the weed seeds in a greenhouse with controllable sunlight for cultivation.
1.2 culture conditions
The method is carried out in a controllable sunlight greenhouse, the temperature at night is 15-20 ℃, the temperature in the daytime is 25-30 ℃, the natural illumination is carried out, and the relative humidity is 60-75%. The soil type was loam, organic matter content 1.8%, pH =7.1.
1.3 instrumentation
ASS-4 model automatic quantitative spraying system, GA110 model ten thousandth electronic balance;
ZDR2000 intelligent data recorder, MLR-352H plant incubator.
2. Design of experiments
2.1 test Agents
95% of dithiopyr technical and 98% of halosulfuron-methyl technical.
The two original medicine solvents are both acetone, and are diluted by a 0.1% Tween 80 aqueous solution, and the two original medicine solvents are diluted as required.
2.2 test treatment
2.2.1 dose setting
Based on the respective activity and indoor measurement characteristics of the two medicaments, different mixed combinations and single-dose original medicaments are respectively set on the basis of indoor initial measurement. Indoor bioassay was performed with water containing no drug and the same emulsifier as a blank control.
2.2.2 test replicates
Each treatment was repeated 4 times, 3 pots each time, 20 weed seeds were sown per pot, 60 plants each time.
3. Treatment method
3.1 treatment time and number of treatments
The test was performed 1 time in total. And (3) thinning after 1-2 leaf period of barnyard grass, 2-3 leaf period of monochoria vaginalis and 2-3 leaf period of abnormal sedge, keeping 15 weeds in each pot, and reserving 45 weeds for treatment each time.
3.2 Using the device and method of administration
The weeds are uniformly placed on a platform and sprayed by an ASS-4 type automatic quantitative spraying system, a TeeJetXR8002VS fan-shaped spray head, the spraying liquid amount is 450L/ha, and the spraying pressure is 0.275MPa. And after the liquid medicine is sprayed for 30s, opening a spraying tower door, and taking out the nutrition pot. Then the air valve is opened, 100ml of clean water is sprayed, and the liquid spraying pipe is cleaned.
4. Test method
Refer to 'indoor bioassay test criteria for pesticides' -NY/T1155.9-2008, NY/T1155.7-2006.
5. Data survey and statistical analysis
5.1 methods of investigation
Because the concentration gradient is inconsistent in the test, the death of the low-concentration weeds is incomplete, and therefore, the fresh weight of the weeds is investigated by adopting an absolute number survey method. Cutting off the survival weed seedlings along the soil surface by using scissors,
the fresh weight of weeds was weighed with an analytical balance.
5.2 investigation time and number of surveys
The investigation was carried out 15 days after the treatment, and was carried out 1 time in total.
5.3 statistical analysis of data
Carrying out regression analysis on the logarithm value of the dosage of the herbicide and the probability value of the control effect by using DPS statistical software to obtain the dosage (ED) of the herbicide for inhibiting 50 percent of weed growth 50 ). And evaluating the combined action type and the proper proportion after mixing by adopting a co-toxicity coefficient method.
And (4) judging standard: CTC (virulence factor) < 80 is antagonistic, between 80-120 is additive, CTC > 120 is synergistic.
Fresh weight control (%) = (blank control fresh grass weight-treatment area fresh grass weight)/blank control fresh grass weight × 100. And the optimal proportion is determined according to factors such as actual control effect, characteristics of the herbicide, balance of the formula and the like. The statistical results are shown in Table 1.
TABLE 1 virulence determination of pyributicarb in combination with dithiopyr-sulfuron
Figure BDA0003515338780000081
/>
Figure BDA0003515338780000091
As can be seen from table 1, the mass ratio of dithiopyr to halosulfuron-methyl in (1. When the mass ratio of the dithiopyr to the halosulfuron-methyl is 3, the toxicity coefficient is the largest and can reach 185.06, the obvious synergistic effect is achieved, and the effect that 1+1 is larger than 2 is exerted.
TABLE 2 toxicity determination of dithiopyr and halosulfuron-methyl on monochoria vaginalis
Figure BDA0003515338780000092
As can be seen from Table 2, the weeding effect of the mixture of the dithiopyr and the halosulfuron-methyl on the monochoria vaginalis is obviously improved, which shows that the combination of the dithiopyr and the halosulfuron-methyl has obvious synergistic effect on the prevention and the removal of the monochoria vaginalis. Particularly, the ratio of the dithiopyr to the halosulfuron-methyl is 3, the cotoxicity coefficient of the mixed two effective substances is optimal, and the invention has obvious synergistic effect.
TABLE 3 toxicity assay of dithiopyr and halosulfuron-methyl combinations against heterotypic Cyperus
Figure BDA0003515338780000093
/>
Figure BDA0003515338780000101
As can be seen from Table 3, the weeding effect of the mixture of the dithiopyr and the halosulfuron-methyl is obviously improved, which indicates that the combination of the dithiopyr and the halosulfuron-methyl has obvious synergistic effect on preventing and killing off the special-shaped cyperus. Particularly, the ratio of the dithiopyr to the halosulfuron-methyl is 3, the cotoxicity coefficient of the mixed two effective substances is optimal, and the invention has obvious synergistic effect.
Test example 2
Herbicide composition field efficacy test for preventing and killing annual weeds in paddy field
Test reagents: 80% wettable powder, 60% emulsifiable solution, 45% suspending agent, 24% aqueous emulsion, 32% dithiopyr emulsifiable solution as a control agent, 75% halosulfuron-methyl water dispersible granules and a blank control group, which are prepared in examples 1 to 4.
The test crop is rice, and the control target is annual gramineous weed, broadleaf weed and cyperaceae weed in rice field, specifically barnyard grass, semen Euphorbiae Lathyridis, herba Amaranthi Tricoloris, herba Monochoriae, and abnormal Cyperus rotundus.
The test method comprises the following steps: the pesticide is applied once in the 2-3 leaf stage of rice seedling and the 2-3 leaf stage of weed. The test field has flat vigor, moderate soil fertility and a pH value of 7.1. 20m per cell per 4 replicates per treatment 2 The total number of the cells is 32, and the cells are arranged in random groups. The conventional spraying method is adopted.
The control effect of each treated weed strain is investigated 15d after the application. The investigation method comprises 4 points per cell, each point is 0.25m 2 . The drug effect calculation formula is as follows:
Figure BDA0003515338780000111
in the formula: CK is the number of weed plants in the control area, and PT is the number of residual weed plants in the application area.
TABLE 4 control of weeds in Paddy field by the control of the efficacy of the test plants (15 days)
Figure BDA0003515338780000112
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As can be seen from Table 4, the herbicidal composition compounded by the dithiopyr and the halosulfuron-methyl has better control effects on gramineous weeds, broadleaf weeds and sedge weeds, and compared with the control effects of the single-component dithiopyr and halosulfuron-methyl on weeds, the dithiopyr and halosulfuron-methyl have super-additive effects, and compared with the dosage of the active ingredients in each medicament, the example 2 (60% emulsifiable concentrate) has the best control effect on gramineous weeds, which indicates that the active content in the medicament is the best content.
Safety investigation: after the application, 7d and 15d, the safety of each treatment to rice seedlings was visually observed. The observation result shows that all tested agents are safe to the growth of rice and do not have the phytotoxicity phenomena of chlorosis, dwarfing and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.

Claims (5)

1. A weeding composition containing dithiopyr and halosulfuron-methyl is characterized in that the weeding composition takes dithiopyr and halosulfuron-methyl as effective components, wherein the mass ratio of the dithiopyr to the halosulfuron-methyl is (1-9) to (1-9).
2. A herbicidal composition according to claim 1, wherein the dithiopyr and halosulfuron-methyl are used in an amount of 20 to 85% by mass based on the total mass of the herbicidal composition.
3. A herbicidal composition according to claim 1, wherein the dithiopyr and halosulfuron-methyl are used in an amount of 25 to 70% by mass based on the total mass of the herbicidal composition.
4. A herbicidal composition according to claim 1, wherein the dithiopyr, halosulfuron-methyl and adjuvant are formulated in any one of the formulation types as pesticidally acceptable; the preparation formulation is wettable powder, missible oil, suspending agent or emulsion in water.
5. Use of the herbicidal composition according to any one of claims 1 to 4 for controlling weeds in paddy fields such as barnyard grass, monochoria vaginalis and cyperus heterophyllus.
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