Weeding composition, preparation and application thereof

Abstract

The invention discloses a weeding composition, a preparation and application of the weeding composition. The weeding composition comprises pyroxasulfone and thiencarbazone-methyl with effective weeding dose. The invention also provides a herbicide containing the weeding composition. The weeding composition and the herbicide are mixed pesticides, the active ingredients pyroxasulfone and thiencarbazone-methyl have a remarkable synergistic effect, weeds such as aegilops tauschii and bromegrass in crop fields can be effectively prevented and treated, the plant control effect, the fresh weight control effect and the comprehensive fresh weight control effect are improved, the dosage is reduced, residues are reduced, and the weeding composition is worthy of popularization and application. The herbicide is safe to field crops, has an obvious effect on resistant weeds in crop fields, and solves the problem that no herbicide is used for controlling post-emergence resistant weeds in wheat fields.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide compounding, and particularly relates to a herbicidal composition containing pyraclostrobin and thiamethoxam, a herbicide containing the herbicidal composition, and applications of the herbicidal composition and the herbicide in preventing and controlling crop weeds. Background Art

[0002] Wheat is a monocotyledonous plant of the Poaceae family. It has a large planting area and is one of the most important food crops in the world. During the wheat planting process, wheat field weeds are prone to grow in wheat fields. They will compete with wheat for nutrients, water, light and other resources, affecting the normal growth of wheat. The presence of these wheat field weeds will seriously affect the growth and development of wheat, resulting in reduced yield and reduced wheat quality.

[0003] At present, the main means of controlling weeds in wheat fields is still the most economical and effective chemical weed control. However, the long-term and continuous use of a single variety or a single mode of action chemical herbicide can easily lead to a significant increase in weed resistance.

[0004] One of the effective ways to solve the above problems is to use existing chemical herbicides in a reasonable way to expand the weed spectrum, improve the control effect, and delay the weed resistance. However, there are many types of chemical herbicides in the pesticide field, and most of the compounding or mixing between agents is still at the additive effect stage. It is very practical to develop a herbicide composition that can expand the weed control spectrum, solve the weed resistance and have a synergistic effect. Summary of the invention

[0005] In view of this, the primary purpose of the present invention is to provide a herbicidal composition, which includes a herbicidally effective amount of sulfamethoxazole and thiamethoxam, which can effectively prevent and control weeds such as agropyron, brome and the like in crop fields, improves the plant control effect, fresh weight control effect, and comprehensive fresh weight control effect, and reduces the amount of medicine used, reduces residues, is safe for field crops, and has obvious effects on resistant weeds in crop fields, thereby solving the problem of controlling resistant weeds in wheat fields without herbicides.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The first aspect of the present invention provides a herbicidal composition, which comprises herbicidally effective amounts of pyraclostrobin and thiamethoxam.

[0008] Among them, Pyroxasulfone, CAS registration number: 447399-55-5, its structural formula is as follows:

[0009]

[0010] Sulfonepyraclostrobin is a new, broad-spectrum, highly active pre-emergence soil treatment herbicide. It is an isoxazole herbicide, belonging to the K3 class of herbicides, with the characteristics of high activity and low dosage, suitable for soil treatment of a variety of crops. At present, it is mainly used to control annual grass weeds and broad-leaved weeds, such as Setaria, Digitaria, Echinochloa and other grass weeds, as well as Amaranth, Datura, Solanum, Abutilon, Chenopodium and other broad-leaved weeds.

[0011] Thiencarbazone-Methyl, CAS registration number: 317815-83-1, its structural formula is as follows:

[0012]

[0013] Thiazonsulfuron-methyl is a sulfonylaminocarbonyl triazolinone herbicide and an acetolactate synthase (ALS) inhibitor. It achieves its weed control effect by inhibiting acetolactate synthase in plants, affecting the biosynthesis of essential branched-chain amino acids, and stopping cell division. Thiazonsulfuron-methyl is systemic and can be absorbed by the roots and leaves of weeds. It has the ability to conduct upward, providing a stable weed control effect. It is currently mainly used in corn fields and grain fields to control grass weeds and broadleaf weeds. It has soil spray and stem and leaf spray activity and can be used before and after budding.

[0014] The inventor of this application has been deeply engaged in the field of pesticide compounding for many years. After a large number of experimental studies, it was found that compounding pyraclostrobin and thiamethoxam to form a herbicidal composition has a significant synergistic effect on weeds in crop fields. The herbicidal activity of the compound is more significant than the expected sum of the activities of the single herbicidal components and the individual activities of the single herbicidal components. It not only improves the plant control effect, fresh weight control effect, and comprehensive fresh weight control effect, but also reduces the amount of medicine used and the residue. It is safe for field crops and has a significant effect on resistant weeds in crop fields, solving the problem of post-emergence resistant weed control in wheat fields without herbicides.

[0015] The "herbicidally effective amount" described herein refers to the dosage of the herbicidal component required to achieve the desired herbicidal effect, which can ensure that the weeds are effectively controlled or killed while minimizing the impact on the crop environment. The herbicidally effective amount can be determined by indoor experiments and field tests well known to those skilled in the art.

[0016] In some specific implementation cases of the present invention, the mass ratio of pyraclostrobin to thiamethoxam is (11.25-180): (3.125-50).

[0017] Preferably, the mass ratio of sulfonepyraclostrobin to thiamethoxam is (45-90):(13.2-26.04).

[0018] The second aspect of the present invention provides a herbicide, which contains the herbicidal composition according to the first aspect of the present invention.

[0019] Among them, in the herbicide of the present invention, the mass percentage of sulfamethoxazole and thiamethoxam accounts for 15% to 60% of the total amount.

[0020] Preferably, in the herbicide, the mass percentage of sulfamethoxazole and thiamethoxam accounts for 45% to 65% of the total amount.

[0021] More preferably, in the herbicide, the mass percentage of pyraclostrobin and thiamethoxam accounts for 60% of the total amount.

[0022] It is to be understood that the herbicide described in the present invention includes not only the herbicidal composition described above, but also any acceptable carrier and / or adjuvant in pesticides.

[0023] The "carrier" described in the present invention generally refers to organic or inorganic, natural or synthetic substances conventionally used in the art. They facilitate the application of herbicidal active ingredients. The carrier is generally inert and must be acceptable in pesticides, especially accepted by the crops or plants to be treated. In some specific implementation cases of the present invention, the carrier can be solid, such as clay, kaolin, diatomaceous earth, silicon dioxide, resin, wax, solid fertilizer, etc.; the carrier can also be liquid, such as water, alcohols, ketones, petroleum fractions, aromatic hydrocarbons or wax hydrocarbons, chlorinated hydrocarbons, liquefied gas, etc.

[0024] The "auxiliary materials" mentioned in the present invention generally refer to the auxiliary agents conventionally used in pesticide formulations in the art, for example, it can be at least one of an emulsifier, dispersant, wetting agent, adhesive, thickener, thixotropic agent, penetrant, stabilizer, chelating agent, dye, colorant, etc.

[0025] It is to be understood that the specific types of carriers, excipients, etc. used in the herbicide of the present invention can be specific substances well known to those skilled in the art, and can be differentiated according to the type of final pesticide formulation. Those skilled in the art can select and add them as needed. As long as the herbicide contains the herbicidal composition described in the present invention, it falls within the protection scope of the present invention, and will not be described in detail one by one here.

[0026] In the present invention, the formulation of the herbicide can be prepared in any pesticide formulation in the field, for example, it can be one of wettable powder, water dispersible granules, aqueous emulsion, suspension, suspoemulsion, aqueous agent, and dispersible oil suspension. In some specific embodiments of the present invention, the formulation of the herbicide is a dispersible oil suspension or a suspension.

[0027] The third aspect of the present invention provides use of the herbicidal composition according to the first aspect of the present invention or the herbicide according to the second aspect of the present invention in controlling harmful weeds in crop fields.

[0028] The crop described in the present invention is specifically wheat, and the harmful weeds are preferably resistant weeds in wheat fields, such as Aegilops tauschii, Bromus spp., Lolium multiflorum and / or Poa annua, especially the control of Aegilops tauschii and / or Bromus spp.

[0029] When specifically applied, the herbicide composition or herbicide in an effective amount can be sprayed on the soil surface of the crop field to be treated by spraying. In some specific implementation cases of the present invention, the effective application amount of the herbicide composition is: 45-90 g ai / hm2 of sulfonepyraclostrobin 2 , thiathionsulfuron 13.2~26.04g ai / hm 2 .

[0030] Beneficial effects of the present invention:

[0031] The herbicidal composition of the present invention has an unexpected synergistic effect, and its herbicidal activity is more significant than the expected sum of the activities of the individual herbicidal components and the individual activities of the individual herbicidal components. Specifically, compared with single agents of pyraclostrobin and thiamethoxam, the herbicidal composition of the present invention reduces the dosage and residue, improves the plant control effect, fresh weight control effect, and comprehensive fresh weight control effect on wheat fields such as tauschia, brome, multiflora ryegrass, and bluegrass, is safe for field crops, and has a significant effect on resistant weeds in wheat fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The ED of the combination of thiamethoxam and pyraclostrobin on brome and aesculus tauschii in the indoor toxicity test of the present invention is 50 Isobologram. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In addition, unless otherwise specified, methods that do not specifically record conditions or steps are conventional methods, and the reagents and materials used can be obtained from commercial sources.

[0035] Herbicide preparation implementation case

[0036] Example 1 15% Thiamphenicol-sulfone-pyraclostrobin suspension

[0037] This embodiment provides a 15% thiamethoxam-sulfuron-methyl·pyraclostrobin suspension, where 15% refers to the mass percentage of the two active ingredients thiamethoxam and pyraclostrobin to the total weight of the herbicide.

[0038] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 10% sulfonepyraclostrobin, 5% thiamethoxam, 15% emulsifier 1601#, 5% wetting agent LS, 4% dispersant SOPA-270, 3% bentonite, 0.1% xanthan gum, 0.4% defoaming agent, 5% propylene glycol, and deionized water is supplemented to 100%.

[0039] Specific preparation: Calculate the amount of each material according to the formula, weigh water and emulsifier, pump them into the kettle, mix them thoroughly, weigh the original drug and other materials, pump them into the preparation kettle, start stirring, continue stirring for 20 minutes after the feeding is completed, after half an hour of high-speed shearing, start sand grinding, mix the materials evenly in the post-mixing kettle after sand grinding, add appropriate defoaming agent according to the actual foam size in the production process, take samples for analysis, and after passing the test, discharge and package.

[0040] Example 2 20% Thiamphenicol-sulfone-pyraclostrobin suspension

[0041] This embodiment provides a 20% thiamethoxam-sulfuron-methyl·pyraclostrobin suspension, wherein the 20% refers to the mass percentage of the two active ingredients thiamethoxam and pyraclostrobin to the total weight of the herbicide.

[0042] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 15% sulfonepyraclostrobin, 5% thiamethoxam, 15% emulsifier 1601#, 5% wetting agent LS, 4% dispersant SOPA-270, 3% bentonite, 0.1% xanthan gum, 0.4% defoaming agent, 5% propylene glycol, and deionized water is supplemented to 100%.

[0043] The specific preparation process is the same as that in Example 1.

[0044] Example 3 30% Thiazolamide Sulfone Suspension Concentrate

[0045] This embodiment provides a 30% thiamethoxam-sulfuron-methyl·pyraclostrobin suspension, where 30% refers to the mass percentage of the two effective components, thiamethoxam-sulfuron-methyl and pyraclostrobin, in the total weight of the herbicide.

[0046] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 20% sulfamethoxazole, 10% thiamethoxam, 15% emulsifier 1601#, 5% wetting agent LS, 4% dispersant SOPA-270, 3% bentonite, 0.1% xanthan gum, 0.4% defoaming agent, 5% propylene glycol, and deionized water is supplemented to 100%.

[0047] The specific preparation process is the same as that in Example 1.

[0048] Example 4 40% Thiamphenicol-sulfone-pyraclostrobin suspension

[0049] This embodiment provides a 40% thiamethoxam-sulfuron-methyl·pyraclostrobin suspension, where 40% refers to the percentage of the two effective components, thiamethoxam-sulfuron-methyl and pyraclostrobin, in the total weight of the herbicide.

[0050] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 30% sulfonepyraclostrobin, 10% thiamethoxam, 15% emulsifier 1601#, 5% wetting agent LS, 4% dispersant SOPA-270, 3% bentonite, 0.1% xanthan gum, 0.4% defoaming agent, 5% propylene glycol, and deionized water is supplemented to 100%.

[0051] The specific preparation process is the same as that in Example 1.

[0052] Example 5 50% Thiamphenicol Sulfone Suspension Concentrate

[0053] This embodiment provides a 50% thiamethoxam-sulfuron-methyl·pyraclostrobin suspension, where 50% refers to the mass percentage of the two active ingredients thiamethoxam and pyraclostrobin to the total weight of the herbicide.

[0054] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 35% sulfonepyraclostrobin, 15% thiamethoxam, 15% emulsifier 1601#, 5% wetting agent LS, 4% dispersant SOPA-270, 3% bentonite, 0.1% xanthan gum, 0.4% defoaming agent, 5% propylene glycol, and deionized water is supplemented to 100%.

[0055] The specific preparation process is the same as that in Example 1.

[0056] Example 6 60% Thiamphenicol-sulfone-pyraclostrobin suspension

[0057] This embodiment provides a 60% thiamethoxam-sulfuron-methyl·pyraclostrobin suspension, where 60% refers to the mass percentage of the two active ingredients thiamethoxam and pyraclostrobin to the total weight of the herbicide.

[0058] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 45% sulfonepyraclostrobin, 15% thiamethoxam, 15% emulsifier 1601#, 5% wetting agent LS, 4% dispersant SOPA-270, 3% bentonite, 0.1% xanthan gum, 0.4% defoaming agent, 5% propylene glycol, and deionized water is supplemented to 100%.

[0059] The specific preparation process is the same as that in Example 1.

[0060] Example 7 50% Thiamphenicol-sulfone-pyraclostrobin dispersible oil suspension

[0061] This embodiment provides a 50% thiamethoxam-sulfuron-methyl·pyraclostrobin dispersible oil suspension, wherein the 50% here refers to the mass percentage of the two active ingredients thiamethoxam andpyraclostrobin to the total weight of the herbicide.

[0062] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 35% sulfonepyraclostrobin, 15% thiamethoxam, 8% polyoxyethylene, 9% castor oil polyoxyethylene ether, 2% dodecylbenzene sulfonate, and corn oil is supplemented to 100%.

[0063] The specific preparation process is: the above raw material components are fully mixed, blended, ball-milled, adjusted and packaged to obtain a dispersible oil suspension.

[0064] Example 8 60% Thiamphenicol-sulfone-pyraclostrobin dispersible oil suspension

[0065] This embodiment provides a 55% thiamethoxam-sulfuron-methyl·pyraclostrobin dispersible oil suspension, wherein the 55% refers to the mass percentage of the two active ingredients thiamethoxam andpyraclostrobin to the total weight of the herbicide.

[0066] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 40% sulfonepyraclostrobin, 20% thiamethoxam, 8% polyoxyethylene, 9% castor oil polyoxyethylene ether, 2% dodecylbenzene sulfonate, and corn oil is supplemented to 100%.

[0067] The specific preparation process is the same as Example 7.

[0068] Example 9 45% Thiamphenicol-sulfone-pyraclostrobin dispersible oil suspension

[0069] This embodiment provides a 45% thiamethoxam-sulfuron-methyl·pyraclostrobin dispersible oil suspension, where 45% refers to the mass percentage of the two active ingredients thiamethoxam andpyraclostrobin to the total weight of the herbicide.

[0070] The composition of the suspending agent in this embodiment is calculated by mass percentage as follows: 30% sulfonepyraclostrobin, 15% thiamethoxam, 8% polyoxyethylene, 9% castor oil polyoxyethylene ether, 2% dodecylbenzene sulfonate, and corn oil is supplemented to 100%.

[0071] The specific preparation process is the same as Example 7.

[0072] Indoor toxicity test

[0073] The potted plant test method was used under greenhouse conditions to study the herbicidal effect of the combination of sulfamethoxazole and thiamethoxam, and the isobol line method was used to evaluate the type of interaction between the two when mixed in different proportions, providing a basis for subsequent field efficacy tests.

[0074] 1. Test weeds: Aegilops tauschii and Bromus striata (seeds were collected from the field in the previous year, with a germination rate of more than 85%).

[0075] 2. Test agents: 97% pyraclostrobin technical (provided by the R&D center of Anhui Fengle Agrochemical Co., Ltd.); 95% thiazolinone technical (provided by the R&D center of Anhui Fengle Agrochemical Co., Ltd.). Use a balance to take a certain amount of technical and dilute to the required concentration.

[0076] The dosage was set by the proportional method: single dose of thiazolinone 3.125, 6.25, 12.5, 25, 50 g (ai) / hm 2 There were 5 treatments in total; single dose of sulfone metabendazole 11.25, 22.5, 45, 90, 180 g (ai) / hm 2 There are 5 treatments in total, and the two agents, thiamethoxam and pyraclostrobin, are compounded.

[0077] 3. Application method: For closed treatment of wheat and weeds before seedlings, use an electric sprayer with a fan-shaped nozzle to simulate field spraying, with a water content of 30 kg / mu.

[0078] 4. Number of applications: Spray treatment, apply once.

[0079] The greenhouse pot method (conducted in a light culture room at a temperature of 10-22°C) was used to spray the soil after sowing and before seedlings of brome and knotweed, with 4 replicates for each treatment. The fresh weight of the aboveground part of each treatment was weighed 20 days after the drug was applied, and the fresh weight inhibition rate was calculated. The dose logarithm-probability value linear method was then used to calculate the ED at each treatment dose of the test agent. 50 value, and plot ED 50 Isobolite, by ED 50 The isobolite line was used to evaluate the interaction between two herbicides and the interaction index of the optimal ratio range was calculated.

[0080] Among them, fresh weight inhibition rate (%) = (blank control fresh weight - treated weed fresh weight) / blank control fresh weight × 100;

[0081] Interaction index (I) = h / (hd), where h is the distance from the origin to the additive action line, and d is the distance from a point on the isoequivalent line to the additive action line.

[0082] Thiazolamide was used as the standard agent in the experiment.

[0083] 5. Results Analysis

[0084] (1) ED at each treatment dose of the test agent 50 value

[0085] As shown in Table 1, the inhibition rate of the fresh weight of brome and Aegilops tauschii increased with the increase of the dose. The data in Table 1 were analyzed by dose-response regression using GraphPad Prism 8.4.2 software to obtain the ED of the fresh weight inhibition of brome and Aegilops tauschii under different ratios. 50 The values ​​are shown in Tables 2 and 3. The ED of sulfonepyraclostrobin on the fresh weight of brome and aegilops tauschii under the quantitative treatment of thiamethoxam 50 The values ​​decreased with the increase of the dosage of thiazolin-methyl (see Table 2). Similarly, under the quantitative treatment of sulfonepyraclostrobin, the ED of thiazolin-methyl on the fresh weight of brome and aesculus tauschii was 50 The values ​​decreased with the increase of sulfonepyraclostrobin dosage (see Table 3).

[0086] Table 1 Inhibition rate of fresh weight of weeds by different ratios of sulfamethoxazole and thiamethoxam (%)

[0087]

[0088]

[0089] Table 2 Inhibition ED of fresh weight of weeds by sulfonepyraclostrobin under quantitative treatment of thiamethoxam 50 value

[0090]

[0091] Table 3 Inhibition of fresh weight of weeds by thiamethoxam under quantitative treatment of sulfonepyraclostrobin 50 value

[0092]

[0093] (2) Isobolism of thiazolinone and pyraclostrobin

[0094] The ED values ​​of thiamethoxam and sulfonepyrazone on brome and aesculus tauschii were plotted with the dose of thiamethoxam as the horizontal axis and the dose of sulfonepyrazone as the vertical axis. 50 The straight line obtained by the value is the additive action line of the two herbicides mixed, that is, the theoretical equivalent line. 50 The values ​​are marked on the coordinate graph. After removing the edge points, they are connected to form a curve, which is the ED of the combination of thiamethoxam and pyraclostrobin on brome and aesculus tauschii. 50 Isobologram ( Figure 1 ).

[0095] pass Figure 1 It can be seen that the ED of each mixed combination 50The values ​​are all below the theoretical isoequivalence line. According to the isoequivalence evaluation principle, the two agents can be mixed within the designed dosage range to enhance the effect on bromegrass and aesculus tauschii. The synergistic effect is most obvious between the two isoequivalence line coordinate points (13.2, 90) and (26.04, 45), that is, thiazosulfuron 13.2~26.04g ai / hm 2 With sulfone pyraclostrobin 45~90g ai / hm 2 The best synergistic effect can be achieved in the range of the ratio.

[0096] Field efficacy test 1

[0097] 1. Application site: Wheat field in Yongqiao District, Suzhou, Anhui Province, the previous crop was corn field. The test site has uniform fertility and flat terrain. The soil is clay, with medium fertility and moderate humidity. The wheat variety is Yannong 1212, and the main annual weeds are Aegilops tauschii and Bromus, which are evenly distributed in the field.

[0098] 2. Time of application: Apply pesticides after wheat is sown and before it emerges, in the afternoon.

[0099] 3. Application conditions: It should be sunny on the day of application, with a temperature of 16℃~23℃.

[0100] 4. Application dosage and method: Application amount 30ml / 667m 2 The liquid medicine is prepared by the secondary dilution method. The medicine machine uses a Linong electric backpack sprayer with a fan-shaped nozzle, and the spray is evenly sprayed manually. The water consumption is 30kg / 667m 2 .

[0101] 5. Experimental group: 30ml / 667m 2 The dosage of spraying the 40% sulfonepyraclostrobin·thiazidesulfuron suspension prepared in Example 4 of the present invention (Group 1); 40% sulfonepyraclostrobin 30ml / 667m 2 (Group 2); 10% thiazolinone 40ml / 667m 2 (Group 3); spray with clean water in the same amount.

[0102] 6. Experimental method: Each experimental group and blank control group were repeated 4 times, and each experimental group and blank control group occupied an experimental field area of ​​120m 2 , the plots were randomly arranged. Before application, 4 points were randomly selected in the plots of each experimental group and the blank control group; 15 days and 30 days after application, the number of dead weeds was investigated and the plant control effect was calculated; 30 days after application, the plant control effect and fresh weight control effect were calculated, and the number of weeds in each experimental group and the blank control group was recorded (plants / m 2 ), calculate the weed control effect (%); 30 days after application, pull out the weeds and weigh the fresh weight (g / m 2), and calculate the fresh weight protection effect (%).

[0103]

[0104] Table 4 Field efficacy test results

[0105]

[0106] As shown in Table 4, after 15 days of application, the suspension containing 40% sulfonepyraclostrobin·thiazonesulfuron prepared in Example 4 of the present invention has a plant control effect on Agropyron tauschii and Bromus strychnifolia of more than 98%, the plant control effect of 40% sulfonepyraclostrobin on Agropyron tauschii and Bromus strychnifolia is 52.0% and 49.2% respectively, and the plant control effect of 10% thiazonesulfuron on Agropyron tauschii and Bromus strychnifolia is 46.7%, and 39.0% respectively. Compared with each single agent, the 40% sulfonepyraclostrobin·thiazonesulfuron suspension in Example 4 not only improves the control effect on weeds, but also expands the weed control spectrum, with a very significant difference (P < 0.01).

[0107] After 30 days of application, the control effect of the suspension containing 40% sulfonepyraclostrobin·thiazonesulfuron-methyl prepared in Example 4 of the present invention on Agropyron tauschii and Bromus strychnifolia was more than 98%, and the fresh weight control effect of 40% sulfonepyraclostrobin on Agropyron tauschii and Bromus strychnifolia was 72.7% and 64.6%, respectively, and the fresh weight effect of 10% thiazonesulfuron on Agropyron tauschii and Bromus strychnifolia was 68.6% and 60.7%, respectively. Compared with each single agent, the 40% sulfonepyraclostrobin·thiazonesulfuron-methyl suspension in Example 4 not only improved the control effect on weeds, but also expanded the weed control spectrum, with a very significant difference (P < 0.01).

[0108] The above test results show that compared with single-dose pyraclostrobin suspension and pyraclostrobin suspension, 40% pyraclostrobin·thiocarb-methyl suspension has improved plant control effect and fresh weight control effect on field aestivum and brome, and is safe for field crops.

[0109] Field efficacy test 2

[0110] 1. Application site: Wheat fields in Shangcai County, Zhumadian City, Henan Province, with the previous crop being corn fields. The test site has uniform fertility and a flat terrain. The soil is sandy loam with medium fertility and moderate humidity. The variety is Ping An 11. The main annual weeds in the wheat field are Aegilops tauschii and Bromus, which are evenly distributed.

[0111] 2. Time of application: Apply pesticides after wheat is sown and before it emerges, in the afternoon.

[0112] 3. Application conditions: It should be sunny on the day of application, with a temperature of 15℃~22℃.

[0113] 4. Application dosage and method: The application amount is 20mL / mu, and the liquid is prepared by the secondary dilution method. The pesticide machine uses a Linong electric backpack sprayer with a fan-shaped nozzle, and the spray is evenly sprayed manually. The water consumption is 30kg / 667m 2 .

[0114] 5. Experimental group: 20mL / 667m 2 The dosage of spraying the 60% sulfonepyraclostrobin·thiazidesulfuron suspension prepared in Example 6 of the present invention (Group 1); 40% sulfonepyraclostrobin 30ml / 667m 2 (Group 2); 10% thiazolinone 40ml / 667m 2 (Group 3); spray with clean water in the same amount.

[0115] 6. Experimental method: Each experimental group and blank control group were repeated 4 times, and each experimental group and blank control group occupied an experimental field area of ​​120m 2 , the plots were randomly arranged. Before application, 4 points were randomly selected in the plots of each experimental group and the blank control group; 15 days and 30 days after application, the number of dead weeds was investigated and the plant control effect was calculated; 30 days after application, the plant control effect and fresh weight control effect were calculated, and the number of weeds in each experimental group and the blank control group was recorded (plants / m 2 ), calculate the weed control effect (%); 30 days after application, pull out the weeds and weigh the fresh weight (g / m 2 ), and calculate the fresh weight protection effect (%).

[0116]

[0117] Table 5 Results of field efficacy test II

[0118]

[0119]

[0120] It can be seen from the test results in Table 5 that 15 days after application, the 60% sulfonepyraclostrobin·thiazolinone-sulfuron suspension prepared in Example 6 of the present invention has a plant control effect of more than 98% on Agropyron tauschii and Bromus strychnifolia, 40% sulfonepyraclostrobin has a plant control effect of 60.0% and 57.1% on Agropyron tauschii and Bromus strychnifolia, respectively, and 10% thiazolinone-sulfuron has a plant control effect of 52.3% and 53.1% on Agropyron tauschii and Bromus strychnifolia, respectively.

[0121] After 30 days of application, the suspension concentrate containing 60% sulfonepyraclostrobin and thiazolinone prepared in Example 6 of the present invention had a plant control effect of more than 98% on Agropyron tauschii and Bromus strychnifolia, the plant control effect of 40% sulfonepyraclostrobin on Agropyron tauschii and Bromus strychnifolia was 60.9% and 61.4%, respectively, and the plant control effect of 10% thiazolinone on Agropyron tauschii and Bromus strychnifolia was 56.5% and 59.6%, respectively.

[0122] After 30 days of application, the weeds were pulled out and their fresh weight was weighed. The fresh weight control effect of the 60% sulfonepyraclostrobin·thiocarbazone-sulfuron suspension prepared in Example 6 of the present invention on Agropyron tauschii and Bromus strychnifolia was more than 99%, the fresh weight control effect of 40% sulfonepyraclostrobin on Agropyron tauschii and Bromus strychnifolia was more than 62.0%, and the fresh weight control effect of 10% thiocarbazone-sulfuron on Agropyron tauschii and Bromus strychnifolia was more than 60.0%.

[0123] The above test results show that compared with each single agent, the suspension containing 60% sulfamethoxazole and thiazolinone prepared in Example 6 not only improves the plant control effect and fresh weight control effect on field weeds, but also expands the weed control spectrum, with extremely significant differences (P < 0.01), and is safe for field crops.

[0124] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0125] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A herbicidal composition, characterized in that: The herbicidal composition comprises herbicidally effective amounts of pyraclostrobin and thiamethoxam.

2. The herbicidal composition according to claim 1, characterized in that The mass ratio of sulfonepyraclostrobin to thiamethoxam is (11.25-180): (3.125-50).

3. The herbicidal composition according to claim 1, characterized in that The mass ratio of sulfonepyraclostrobin to thiamethoxam is (45-90): (13.2-26.04).

4. A herbicide, characterized in that: Contains the herbicidal composition according to any one of claims 1 to 3.

5. The herbicide according to claim 4, characterized in that In the herbicide, the mass percentage of pyraclostrobin and thiamethoxam accounts for 15% to 60% of the total amount.

6. The herbicide according to claim 4, characterized in that In the herbicide, the mass percentage of pyraclostrobin and thiamethoxam accounts for 45% to 65% of the total amount.

7. The herbicide according to claim 4, characterized in that In the herbicide, the mass percentage of pyraclostrobin and thiamethoxam accounts for 60% of the total amount.

8. The herbicide according to claim 4, characterized in that The herbicide further comprises any pesticide-acceptable carrier and / or adjuvant.

9. The herbicide according to claim 4, characterized in that The herbicide is in the form of a wettable powder, a water dispersible granule, an aqueous emulsion, a suspension, a suspoemulsion, an aqueous solution, or a dispersible oil suspension; Preferably, the herbicide is in the form of a dispersible oil suspension or a suspension concentrate.

10. Use of the herbicidal composition according to any one of claims 1 to 3 or the herbicide according to any one of claims 4 to 9 for controlling harmful weeds in crop fields; Preferably, the crop field is a wheat field, and the harmful weeds are Aegilops tauschii, Bromus striata, Lolium multiflorum and / or Poa annua; Preferably, the harmful weeds are Aegilops tauschii and / or Bromus striata; Preferably, the effective application amount of the herbicidal composition is: 45-90 g ai / hm2 of sulfonepyraclostrobin 2 , thiathionsulfuron 13.2~26.04g ai / hm 2 .

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