Herbicidal composition and its application

Abstract

The present invention relates to the technical field of herbicides, and in particular to a herbicidal composition with a synergistic effect and its application. The effective active ingredients of the herbicidal composition provided by the present invention include the following components by mass: 0.5-1.5 parts of mesotrione, 3-12 parts of butoxyethyl triclopyrazone and 1-4 parts of ametryn. The herbicidal composition provided by the present invention has a synergistic effect under the above-mentioned specific dosage ratio conditions, which can not only significantly improve the killing rate of weeds, but also accelerate the speed of action. In addition, the herbicidal composition provided by the present invention also has the advantages of low dosage, high environmental safety, and a wide spectrum of weed control.

Description

Technical Field

[0001] The present invention relates to the technical field of herbicides, and in particular to a herbicidal composition with synergistic effect and application thereof. Background Art

[0002] Agricultural weed control is an important part of agricultural production and is of great significance to improving the yield and quality of agricultural products. Modern agricultural production mainly uses chemical pesticides to control weeds, but with the application of various pesticides, the problem of weed resistance in farmland has become more and more serious. Common farmland weeds include crabgrass, barnyard grass, foxtail grass, purslane, and amaranth. In the farmland environment where the above weeds grow, the existing herbicides are limited by the resistance of weeds and the safety of the dosage, and it is often difficult to achieve the expected weed control effect.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a herbicidal composition and application thereof.

[0005] Specifically, the technical solution of the present invention is as follows: In a first aspect, the present invention provides a herbicidal composition, wherein the effective active ingredients include the following components in parts by weight: 0.5-1.5 parts of mesotrione, 3-12 parts of butoxyethyl triclopyrazone and 1-4 parts of ametryn.

[0006] Preferably, the mass ratio of mesotrione to ametryn is 1:1-4.

[0007] Preferably, the mass ratio of butoxyethyl triclopyrazone to ametryn is 0.75-12:1.

[0008] Preferably, the mass ratio of butoxyethyl triclopyrazone to ametryn is 0.75-6:1.

[0009] Preferably, the herbicidal composition is in the form of a wettable powder, a suspension concentrate, a dispersible oil suspension concentrate and a water-dispersible granule.

[0010] In a second aspect, the present invention provides use of the herbicidal composition in killing weeds.

[0011] Preferably, the weeds include grass weeds.

[0012] Preferably, the grass weeds include at least one of crabgrass, barnyard grass and foxtail grass.

[0013] Preferably, the weeds also include broadleaf weeds.

[0014] Preferably, the broadleaf weeds include at least one of Amaranthus tricolor and Purslane.

[0015] Further preferably, the dosage of the herbicidal composition is calculated as the active ingredient concentration of ametryn: 100-200 g a.i. / ha; Alternatively, the dosage of the herbicidal composition is calculated as the concentration of the active ingredient of ametryn: 12.5-50 g a.i. / ha; Alternatively, the dosage of the herbicidal composition is calculated as 25-50 g.i. / ha based on the active ingredient concentration of ametryn.

[0016] Beneficial effects: The present invention provides a herbicidal composition, wherein the effective active ingredients include the following components in parts by weight: 0.5-1.5 parts of mesotrione, 3-12 parts of butoxyethyl triclopyrazone and 1-4 parts of ametryn. The herbicidal composition provided by the present invention has a synergistic effect under the above-mentioned specific dosage ratio conditions, and can not only significantly improve the killing rate of weeds, but also accelerate the action speed. In addition, the herbicidal composition provided by the present invention also has the advantages of low dosage, high environmental safety, wide weed control spectrum, etc. DETAILED DESCRIPTION

[0017] The invention provides a herbicidal composition, the effective active ingredients of which include mesotrione, butoxyethyl triclopyrazone and ametryn.

[0018] In the present invention, the mass fraction of mesotrione is 0.5-1.5 parts. Preferably, the mass fraction of mesotrione can be selected as a value in a numerical range consisting of any two values ​​of 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4 and 1.5.

[0019] In the present invention, the mass fraction of butoxyethyl triclopyr is 3-12 parts. Preferably, the mass fraction of butoxyethyl triclopyr can be selected as a value in a numerical range consisting of any two values ​​among 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12.

[0020] In the present invention, the mass fraction of ametryn is 1 to 4. Preferably, the mass fraction of ametryn can be selected as a value in a numerical range consisting of any two values ​​of 1, 1.5, 2, 2.5, 3, 3.5 and 4.

[0021] Further preferably, the mass ratio of mesotrione to ametryn is 1:1-4. The present invention shows that when the mass ratio of mesotrione to ametryn is in the range of 1:1-4, its killing effect on grass weeds such as crabgrass, barnyard grass, and foxtail grass is significantly enhanced.

[0022] Further preferably, the mass ratio of triclopyr butoxyethyl ester to ametryn is 0.75-12: 1. The present invention shows that when the mass ratio of triclopyr butoxyethyl ester to ametryn is in the range of 0.75-12: 1, the comprehensive control effect on purslane is better.

[0023] Further preferably, the mass ratio of triclopyr butoxyethyl ester to ametryn is 0.75-6: 1. The present invention shows that when the mass ratio of triclopyr butoxyethyl ester to ametryn is in the range of 0.75-6: 1, the comprehensive control effect on Amaranthus trichoderma is better.

[0024] Further preferably, the formulation of the herbicidal composition is one of a wettable powder, a suspension (with water as a dispersion medium), a dispersible oil suspension and a water-dispersible granule.

[0025] More preferably, when the dosage form is a wettable powder, the excipients include one or a combination of dispersants, wetting agents, disintegrants and fillers.

[0026] The present invention does not particularly limit the sources of the components, and they can be obtained through conventional commercial channels in the art.

[0027] The herbicidal composition provided by the present invention not only plays a synergistic role in the prevention and control of grass weeds, but also has a wide weed control spectrum and has a good control effect on broad-leaved weeds such as purslane and amaranth. The herbicidal composition provided by the present invention can exert a better weed control effect in a complex farmland environment where multiple weeds survive, and has application prospects.

[0028] The present invention provides the use of the above-mentioned herbicidal composition in killing weeds.

[0029] Preferably, the weeds include grass weeds.

[0030] Preferably, the grass weeds include at least one of crabgrass, barnyard grass and foxtail grass.

[0031] Preferably, the weeds also include broadleaf weeds.

[0032] Preferably, the broadleaf weeds include at least one of Amaranthus tricolor and Purslane.

[0033] Preferably, the weeds include crabgrass, barnyard grass, foxtail grass, amaranth and purslane.

[0034] Preferably, the dosage of the herbicidal composition is calculated as the active ingredient concentration of ametryn: 100-200 g a.i. / ha; Another preferred embodiment is that the dosage of the herbicidal composition is calculated as the active ingredient concentration of ametryn: 12.5-50 g a.i. / ha; In another preferred embodiment, the dosage of the herbicidal composition is 25-50 ga.i. / ha in terms of the active ingredient concentration of ametryn.

[0035] The present invention shows that mesotrione has a good effect on the grass weeds Digitaria and Echinochloa crusgalli. After application, the new leaves of the weeds turn white as they grow, and then gradually dry up and die. Low-dose treatment can cause greening. It has a poor effect on the grass weed Setaria viridis. It has a certain effect on the broad-leaved weed Amaranthus chinensis, but a poor effect on Portulaca oleracea. Butoxyethyl triclopyr has a good effect on the broad-leaved weeds Amaranthus chinensis and Portulaca oleracea, but is ineffective against grass weeds. Amethoxazole has an excellent effect on the broad-leaved weeds Portulaca oleracea and Amaranthus chinensis, and has a good effect at a low dose. It has a certain effect on Digitaria viridis, Echinochloa crusgalli and Setaria viridis, and the contact killing speed is fast. After the compounding of mesotrione, isooctyl triclopyr and amethoxazole, the weed control spectrum advantages are complementary. After compounding, the advantages of the three single agents are combined to achieve good effects on both gramineous weeds and broad-leaved weeds; the synergistic effect on gramineous weeds is obvious. The single agents of mesotrione and amethoxazole are generally effective in controlling gramineous weeds, but after compounding, the synergistic effect is obvious, which is significantly better than the single agent effect; the speed of action is accelerated, and the death rate of both gramineous weeds and broad-leaved weeds after application is accelerated. The results of the combined action mode show that the combined action type of the three compounds for controlling gramineous weeds belongs to a significant synergistic effect, and the combined action type for broad-leaved weeds belongs to an additive effect. The present invention mixes mesotrione, butoxyethyl triclopyr and amethoxazole, proving that the combination of the three can play a significant advantage in farmland weed control. Among them, when controlling crabgrass, barnyard grass, foxtail grass, amaranth, and purslane, the best effect is achieved by mixing mesotrione, triclopyr butoxyethyl, and amethoxazole in the range of 1:3-12:1-4. In production, the economic cost, safety, and field efficacy test results can be considered to select the appropriate ratio.

[0036] The technical solutions provided by the present invention are described in detail below in conjunction with the examples, but they should not be understood as limiting the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the examples are conventional methods; the materials and reagents used can be obtained from commercial sources.

[0037] Example 1 In this example, a potted plant test method was used under artificial climate chamber conditions to study the combined effect of mesotrione, butoxyethyl triclopyr, and ametryn in stem and leaf treatment for controlling weeds such as crabgrass, barnyard grass, foxtail grass, amaranth, and purslane.

[0038] Among them, the test agents are: 97% mesotrione technical, 97% ametryn technical, and 99% triclopyr technical (provided by Qiaochang Modern Agriculture Co., Ltd.).

[0039] The tested weeds were: Crabgrass ( Bloody fingernail (L.) Scop.), Echinochloa crus-galli ( Echinochloa rice V.), Setaria viridis ( Green setaria (L.) Beauv), Amaranthus chinensis ( Acalypha australis L.), Portulaca oleracea ( Purslane L.).

[0040] The test material cultivation method is as follows: the test soil is 20 cm loam and culture matrix on the ground, mixed in a ratio of 3:1 to form culture soil. The test weeds were cultivated in an artificial climate chamber, with the day and night temperatures set at 30°C and 27°C, respectively, and the light: dark time was 12h:12h. A certain amount of seeds of Digitaria, Echinochloa crusgalli, Setaria viridis, Amaranthus oleraceus, and Purslane were sown in plastic pots with a diameter of 9 cm, covered with 1~2 mm of soil, placed in an enamel tray filled with water, and watered by bottom infiltration. After the water seeped to the soil surface, it was transferred to the artificial climate chamber for cultivation.

[0041] The dosages of mesotrione, butoxyethyl triclopyr, and amethoxazole are as follows: mesotrione is set at 6.25, 12.5, 25, 50, and 100 g ai / ha, butoxyethyl triclopyr is set at 37.5, 75, 150, 300, and 600 g ai / ha, and amethoxazole is set at 12.5, 25, 50, 100, and 200 g ai / ha. Each single agent has 5 dosages. When compounding to control grass weeds, the three high dosages are compounded separately; when controlling broadleaf weeds, the three low dosages are compounded separately.

[0042] The specific test contents are as follows: 1. Preparation of the drug: First add the special emulsifier to dissolve the original drug, then add 2 times of N, N-dimethylformamide until it is completely dissolved, and dilute it with 0.1% Tween-80 aqueous solution to 1% mother liquor for standby use.

[0043] 2. Pesticide treatment: The test was carried out in the 2-leaf 1-heart stage of Digitaria, Echinochloa crus-galli, and Setaria officinalis, and the 2-true-leaf stage of Amaranthus ferox and Purslane, and the stems and leaves were evenly sprayed. The ASS-4 automatic control spraying system was used indoors for pesticide spraying. The fan-shaped nozzle, combined with the nozzle pressure and flow rate, sprayed 50 mL of liquid (equivalent to 30 L of water per mu) according to the actual spraying area (1.1 m2), adjusted the running speed, and evenly arranged the plastic pots to be treated on the spray table for even spraying. The spray pressure was 0.35 MPa, and the fan-shaped nozzle flow rate was 800 mL / min. Spray from low to high amounts in sequence. The test was carried out on November 10, 2023, and the pesticide was applied once. After spraying, it was dried for one day, placed in an artificial climate chamber, and watered regularly to keep it moist.

[0044] 3. After application, record the damage symptoms of weeds in detail (such as growth inhibition, chlorosis, deformity, etc.), and visually compare the efficacy of the compound combination and each single agent. After 20 days, weigh the fresh weight of the aboveground part of each treated weed and calculate the fresh weight control effect.

[0045] The test results were evaluated by Colby method to determine the type of combined effects after mixing.

[0046] The Colby method theoretical efficacy calculation formula is: E0 = 100- (A × B × C ... n) / 100n-1 Note: The denominator is 100n-1, where n is the number of mixed herbicide varieties; A, B, and C are the weed survival rates of various herbicides respectively; E0 represents the calculated theoretical weed control effect; and E represents the actual weed control effect of different mixing ratios.

[0047] When E-E0>5, it is a synergistic effect; when E-E0 is between -5~5, it is an additive effect; when E-E0<-5, it is an antagonistic effect.

[0048] 4. Test results 4.1. Observation after application: Mesotrione has a good effect on Gramineae weeds, Digitaria and Echinochloa crusgalli. After application, the new leaves of the weeds turn white as they grow, and then gradually dry up and die. Low-dose treatments can turn green again. It has a poor effect on Gramineae weeds, Setaria viridis. It has a certain effect on the broad-leaved weed Amaranthus chinensis, but a poor effect on Portulaca oleracea. Butoxyethyl triclopyr has a good effect on the broad-leaved weeds Amaranthus chinensis and Portulaca oleracea, but is ineffective against Gramineae weeds. Amethoxazole has an excellent effect on the broad-leaved weeds Portulaca oleracea and Amaranthus chinensis, and has a good effect at a low dose. It has a certain effect on Digitaria, Echinochloa crusgalli, and Setaria viridis, and the contact killing speed is fast. After the three are combined, the weed control spectrum has complementary advantages, and has a good effect on the tested weeds, Digitaria chinensis, Echinochloa crusgalli, Setaria viridis, Amaranthus chinensis, and Portulaca oleracea, with excellent quick-acting and long-lasting effects.

[0049] 4.2. Analyze the combined effect of mesotrione, butoxyethyl triclopyrazone and amethoxazole on crabgrass, barnyard grass and foxtail grass indoors.

[0050] Mesotrione has a good effect on the grass weeds Digitaria and Echinochloa crusgalli. After application, the new leaves of the weeds turn white as they grow, and then gradually dry up and die. Low-dose treatments can turn green again. It has a poor effect on the grass weed Setaria viridis. Triclopyr butoxyethyl is ineffective against the grass weeds Digitaria viridis, Echinochloa crusgalli, and Setaria viridis. Amethoxazole has a certain effect on Digitaria viridis, Echinochloa crusgalli, and Setaria viridis, and the contact killing speed is fast. The combination of the three has an excellent overall effect on Digitaria viridis, Echinochloa crusgalli, and Setaria viridis, and the effect is significantly better than that of mesotrione alone. It is visually observed that the combination of mesotrione and amethoxazole does not affect the effect of adding a certain amount of triclopyr butoxyethyl, and the overall effect is synergistic.

[0051] 20 days after application, the fresh weight control effect of each treatment is shown in Table 1, and the original data is shown in Table 3. The theoretical control effect of each mixed combination was calculated by Colby method, and compared with the measured control effect to determine the type of joint action of the mixed combination on Digitaria, Echinochloa crusgalli, and Setaria viridis. The calculation results are shown in Table 1. The difference between the measured control effect and the theoretical control effect on Digitaria, Echinochloa crusgalli, and Setaria viridis is between 4.0 and 16.1, all of which are positive values ​​and most of which are greater than 5.0, so the combination of the three to control Digitaria, Echinochloa crusgalli, and Setaria viridis is a synergistic effect.

[0052] In terms of comprehensive control effect and E-E0 value, for controlling crabgrass, barnyard grass and foxtail grass, it is recommended to use mesotrione 50~100g ai / ha + amethoxazole 100~200g ai / ha, that is, the ratio of the two is 1:1~4. Adding a certain amount of butoxyethyl triclopyr does not affect the effect, and the control effect is above 80.2%. The combined action mode is additive and synergistic.

[0053] 4.2. Analyze the combined effects of mesotrione, butoxyethyl triclopyr and amethoxazole on Portulaca oleracea and Amaranthus tricolor indoors.

[0054] Mesotrione has a certain effect on the broad-leaved weed Amaranthus chinensis, but has a poor effect on Portulaca oleracea; triclopyr butoxyethyl has a good effect on the broad-leaved weeds Amaranthus chinensis and Portulaca oleracea; amethoxazole has a good effect on Amaranthus chinensis and Portulaca oleracea. After the three are mixed, the overall effect is excellent, and it is visually estimated that the mixture of the three is an additive effect.

[0055] 20 days after application, the fresh weight control effect of each treatment is shown in Table 2, and the original data is shown in Table 4. The theoretical control effect of each mixed combination was calculated by Colby method, and compared with the measured control effect to determine the type of joint effect of the mixed combination on Amaranthus tricolor and Purslane (Table 2). The results showed that the difference between the measured control effect and the theoretical control effect of the three mixed combinations on Amaranthus tricolor and Purslane was between -0.9 and 5.7, which was an additive effect. Based on the comprehensive control effect and E-E0 value, for controlling the broad-leaved weed Portulaca oleracea, it is recommended to use 37.5-150 g ai / ha of butoxyethyl triclopyr + 12.5-50 g ai / ha of amethoxazole, that is, the ratio of the two is 0.75-12:1, and adding a certain amount of mesotrione will not affect the effect; for controlling Amaranthus triclopyr, it is recommended to use 37.5-150 g ai / ha of butoxyethyl triclopyr + 25-50 g ai / ha of amethoxazole, that is, the ratio of the two is 0.75-6:1, and adding a certain amount of mesotrione will not affect the effect.

[0056] Based on the control effects and joint action modes of butoxyethyl triclopyr mixed with mesotrione and amethoxazole on four weeds, it is recommended that the mixture of mesotrione, butoxyethyl triclopyr and amethoxazole in the ratio of 1:3~12:1~4 should be used for better control.

[0057] Table 1 The results of the control of three pesticides mixed together against Digitaria, Echinochloa crusgalli and Setaria viridis Table 2 The results of the control effect of three kinds of pesticides on Amaranthus oleraceus and Purslane Table 3 Raw data of the investigation on the mixing results of three kinds of drugs (g / pot) Table 4 The original data of the investigation on the mixing results of three kinds of drugs (g / pot) The above-described embodiments only express several implementation methods of the present invention, which are convenient for understanding the technical solution of the present invention in detail, but cannot be understood as limiting the scope of protection of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the scope of protection of the present invention.

Claims

1. A herbicidal composition, characterized in that The effective active ingredients include the following components in parts by weight: 0.5-1.5 parts of mesotrione, 3-12 parts of butoxyethyl triclopyrazone and 1-4 parts of ametryn.

2. The herbicidal composition according to claim 1, characterized in that: The mass ratio of mesotrione to ametryn is 1:1-4.

3. The herbicidal composition according to claim 1, characterized in that: The mass ratio of butoxyethyl triclopyr and ametryn is 0.75-12:1, preferably 0.75-6:

1.

4. The herbicidal composition according to any one of claims 1 to 3, characterized in that The formulation of the herbicidal composition is one of wettable powder, suspension, dispersible oil suspension and water-dispersible granules.

5. Use of the herbicidal composition according to any one of claims 1 to 4 in killing weeds.

6. The use according to claim 5, characterized in that: The weeds include grass weeds.

7. The use according to claim 6, characterized in that: The grass weeds include at least one of crabgrass, barnyard grass and foxtail grass.

8. The use according to claim 6, characterized in that: The weeds also include broadleaf weeds.

9. The use according to claim 8, characterized in that: The broadleaf weeds include at least one of Amaranthus tricolor and Purslane.

10. The use according to any one of claims 6 to 9, characterized in that: The dosage of the herbicidal composition is calculated based on the concentration of the active ingredient of ametryn: 100-200 g.i. / ha; Alternatively, the dosage of the herbicidal composition is calculated as the concentration of the active ingredient of ametryn: 12.5-50 g a.i. / ha; Alternatively, the dosage of the herbicidal composition is calculated as 25-50 g.i. / ha based on the active ingredient concentration of ametryn.

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