A ternary herbicidal composition containing dimethachlor and isoxaflutole and its use

Abstract

The present application provides a kind of herbicidal composition comprising methoxychlor, quinclorac and terbumeton, comprising the following mass ratio of active ingredients: the mass ratio of methoxychlor, quinclorac and terbumeton is 1-30:1-30:1-40;The herbicidal composition of the present application can be used for the prevention and control of gramineous weeds, broadleaf weeds and sedge weeds, and the composition can be prepared into suspoemulsion, dispersible oil suspension concentrate, wettable powder, water dispersible granules;The composition has significant synergistic effect, can effectively reduce the use dose of active ingredient, and field observation is safe to crops, and the control effect on most field weeds is excellent.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pesticides, in particular to a herbicidal composition containing dichlorprop-P-ethyl, quinclorac and terbucarb and application thereof. BACKGROUND

[0002] Sorghum has the characteristics of drought and waterlogging resistance, salt and alkali tolerance, and light and thin tolerance, high photosynthetic efficiency, high biological yield, and strong adaptability, and is an ideal green and high-quality forage crop for developing the breeding industry, and is an indispensable raw material crop for the brewing and feed processing industries. As a marginal and pioneer crop in dry land farmland in China, it has the purposes of forage, brewing, and fiber. Sorghum belongs to the category of small grains, and due to its sensitivity to herbicides, there are few registered herbicides for sorghum fields. At present, the occurrence of weeds in sorghum fields is increasing year by year and the community is also changing. In order to adapt to the needs of chemical weeding for large-scale production of sorghum, we have carried out indoor screening tests and field control effect tests of chemical weeding agents for weeds in sorghum fields.

[0003] Dichlorprop-P-ethyl is a selective hormone phenoxy carboxylic acid herbicide with strong systemicity. It is mainly used for post-emergence stem and leaf treatment, penetrates the cuticle and cell membrane, and finally conducts to each part, and can be used for broadleaf weeds and sedge weeds on various crops.

[0004] Quinclorac belongs to quinoline carboxylic acid herbicides and is a synthetic hormone inhibitor. The agent can be rapidly absorbed by germinating seeds, roots, stems and leaves, and rapidly conducted to stems and tops, causing weeds to die of poisoning, which is similar to the symptoms of auxin substances. It is safe for rice growth. The effective period is about 25 days, which can effectively control weeds such as barnyard grass.

[0005] Terbucarb is a broad-spectrum systemic triazine herbicide, mainly used for controlling annual weeds in spring maize fields, including grass weeds such as crabgrass, Chinese alpine paper, barnyard grass, and dogtail grass, broadleaf weeds such as amaranthus retroflexus, amaranthus viridis, and chenopodium, and sedge weeds such as cyperus.

[0006] There is no report on the herbicidal composition of dichlorprop-P-ethyl, quinclorac and terbucarb in the prior art. SUMMARY

[0007] The purpose of the present application is to provide a herbicidal composition containing dichlorprop-P-ethyl, quinclorac and terbucarb. The specific scheme is as follows:

[0008] A herbicidal composition containing dichlorprop-P-ethyl, quinclorac and terbucarb, characterized in that the active ingredients are in a mass ratio of 1-30:1-30:1-40.

[0009] Preferably, the mass ratio of dimethachlor, quinclorac and terbuthylazine is 5-15:5-15:10-30.

[0010] Preferably, the mass ratio of dimethachlor, quinclorac and terbuthylazine is 10:10:20.

[0011] The percentage content of the active ingredient in the herbicidal composition described in the present application is 1-85%, containing a pesticide-usable auxiliary ingredient. Preferably, the percentage content of the active ingredient is 5-65%

[0012] The auxiliary ingredient contains one or more of dispersing agents, wetting agents, emulsifiers, thickening agents, binding agents, disintegrating agents, preservatives, co-solvents, antifreezing agents, fillers, and solvents.

[0013] The dosage form of the herbicidal composition can be dispersible oil suspensions, wettable powders, water dispersible granules, or suspoemulsions. Preferably, it is a suspoemulsion or a dispersible oil suspension.

[0014] The herbicidal composition described in the present application is used for controlling weeds in crop fields. Preferably, the crop is sorghum, and the weeds are grass weeds, broadleaf weeds, and sedge weeds. In particular, the weeds are Echinochloa crus-galli, Digitaria sanguinalis, Digitaria ischaemum, Chenopodium album, Amaranthus retroflexus, or Brassica campestris.

[0015] Beneficial technical effects

[0016] The herbicidal composition prepared in the present application can be used for controlling grass weeds, broadleaf weeds, and sedge weeds, and the composition has a significant synergistic effect, which can effectively reduce the dosage of the active ingredients and is safe for crops in the field. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Figure 1 is a preparation process chart of formulation 1 of the ternary herbicidal composition in Example 3. DETAILED DESCRIPTION

[0018] Example 1: Indoor bioassay of ternary herbicidal composition on weeds in sorghum fields

[0019] Test agents: dimethachlor technical material, quinclorac technical material, and terbuthylazine technical material.

[0020] Test target: mature and full seeds of the previous year were taken as the test target, and the mature and full seeds were used for the test.

[0021] Cultivation condition: The test was carried out in an artificial climate room. A number of plastic pots with a diameter of 30 cm were selected, and an appropriate amount of moistened and sterilized soil was added. The soil was completely moistened by using the pot bottom infiltration irrigation method. The pretreated weed seeds were uniformly sown on the soil surface, and an appropriate amount of sieved fine soil was covered to just cover the weed seeds. After sowing, the pots were moved into the greenhouse for conventional cultivation, and water was supplemented by using the pot bottom infiltration irrigation method. When the seedlings had 4-5 leaves, they were thinned, and 20 seedlings were left in each pot.

[0022] Pesticide treatment: An appropriate amount of test pesticide was accurately weighed, a small amount of emulsifier Tween 80 and N,N-dimethylformamide was added for dissolution, and then 0.1% Tween 80 aqueous solution was used to prepare a 1% stock solution. The pesticide solution was diluted with 0.1% Tween 80 aqueous solution, and 6 doses were set by using the 1 / 2 dose method. Two days after the weeds were thinned, stem and leaf spraying was carried out according to the designed dosage. An automatic control spraying tower was used for spraying equipment, the spraying amount was calibrated before the test, and stem and leaf spraying was carried out in order from low dose to high dose according to the test design. At the same time, a 0.1% Tween 80 aqueous solution containing an equal amount of organic solvent was used for treatment as a blank control. Each treatment had 4 replicates.

[0023] Investigation and statistics: The growth status of the test weeds was observed and recorded regularly after treatment. 21 days after treatment, the aboveground weeds were harvested and weighed to calculate the fresh weight control effect. Fresh weight control effect = (average fresh weight of weeds in the blank control area - average fresh weight of weeds in the treatment area) / average fresh weight of weeds in the blank control area x 100%.

[0024] Regression analysis was performed on the logarithmic values of pesticide doses (x) and the probability values of weed control (y) to establish a regression equation (y = a + bx), calculate the correlation coefficient (r), the effective dose for 50% inhibition of weed fresh weight (GR50), and the confidence interval, etc.

[0025] The joint action type of the mixture was calculated by using the co-toxicity coefficient method according to the following formula. Toxicity index = GR50 of standard pesticide / GR50 of measured pesticide x 100; co-toxicity coefficient of mixture = measured value of toxicity index of mixture / theoretical value of toxicity index of mixture x 100. Theoretical value of toxicity index of mixture = toxicity index of A x proportion of A in mixture + toxicity index of B x proportion of B in mixture. Judgment standard: co-toxicity coefficient less than 80 is antagonistic, between 80-120 is additive, and greater than 120 is synergistic.

[0026] Results and analysis:

[0027] From Table 1, the GR50 values of methoxychlor isooctyl ester technical, quinclorac technical and terbucarb technical on goosegrass are 5.21 g / acre, 4.81 g / acre and 17.93 g / acre respectively. When the mass ratio of methoxychlor isooctyl ester technical, quinclorac technical and terbucarb is 1:1:2 and 1:1:1, the co-toxicity coefficients of the three herbicides on goosegrass are 149.85 and 122.85 respectively, showing significant synergistic effect. Especially, when the mass ratio of methoxychlor isooctyl ester technical, quinclorac technical and terbucarb is 1:1:2, the synergistic effect is significant. When the mass ratio of methoxychlor isooctyl ester technical, quinclorac technical and terbucarb is 10:1:10, 1:10:1, 1:1:5 and 10:10:1, the three herbicides show additive effect on goosegrass.

[0028] In subsequent tests, the synergistic ternary combination (the mass ratio of methoxychlor isooctyl ester technical, quinclorac technical and terbucarb is 1:1:2) is used for preparation of formulations and field efficacy test.

[0029] Table 1: Indoor biological test of ternary herbicidal composition on goosegrass in sorghum field

[0030]

[0031] Example 2: Indoor biological test of ternary herbicidal composition on goosegrass in sorghum field

[0032] Test agents: methoxychlor isooctyl ester technical, quinclorac technical and terbucarb technical.

[0033] Test targets: the mature seeds of Abutilon theophrasti, Echinochloa crus-galli and Digitaria sanguinalis are selected as test objects.

[0034] Cultivation conditions: the test is carried out in an artificial climate chamber. A plurality of plastic pots with a diameter of 30 cm are selected, and an appropriate amount of moistened and sterilized soil is added. The soil is completely moistened by using the bottom drip irrigation method. The pretreated test weed seeds are uniformly sown on the soil surface, and an appropriate amount of sieved fine soil is covered to just cover the weed seeds. After sowing, the pots are moved into the greenhouse for conventional cultivation, and water is supplemented by using the bottom drip irrigation method. When the grass weeds have 2-3 leaves and the broadleaf weeds have 3-4 leaves, the seedlings are thinned, and 20 plants are left in each pot.

[0035] Pesticide treatment: 2 days after the weeds are thinned, the stems and leaves are treated by spraying according to the designed dosage. An automatic control spraying tower is used for spraying equipment, and the spraying amount is calibrated before the test. The stems and leaves are treated by spraying according to the test design, and a 0.1% Tween 80 aqueous solution containing an equal amount of organic solvent is used as a blank control. Each treatment has 4 replicates.

[0036] Investigation and statistics: after treatment, the growth state of the test weeds was observed periodically, and 21 days after treatment, the above-ground weeds were harvested and weighed to calculate the fresh weight control effect. Fresh weight control effect = (average fresh weight of weeds in the blank control area - average fresh weight of weeds in the treatment area) / average fresh weight of weeds in the blank control area x 100%.

[0037] According to the Guidelines for Pesticide Indoor Biological Test, the data was statistically analyzed, and the combined effect of the mixed herbicides was tested and judged by the Gowing method. E0 represents the theoretical fresh weight control effect (hereinafter referred to as theoretical control effect) and E represents the measured fresh weight control effect (hereinafter referred to as actual control effect), wherein E0 = a + b - a x b / 100, a and b are the measured fresh weight control effects of each dose of the two herbicides, respectively; when -10 ≤ E - E0 ≤ 10, it is additive effect, when E - E0 > 10, it is synergistic effect, and when E - E0 < -10, it is antagonistic effect

[0038] Results and analysis:

[0039] As can be seen from Tables 2-4, the use of dichlorisoxazide, quinclorac and terbuthylazine alone or in binary combination has poor control effect on grasses and broadleaf weeds; after the combination of dichlorisoxazide, quinclorac and terbuthylazine, the control effect of the ternary composition is significantly improved, and the synergistic effect is significantly shown, which can effectively reduce the dosage of active ingredients, reduce the occurrence of weed resistance, and reduce environmental pollution.

[0040] Table 2 Indoor biological test of ternary herbicidal composition on abutilon theophrasti in sorghum field

[0041]

[0042]

[0043] Table 3 Indoor biological test of ternary herbicidal composition on euphobia heterophylla in sorghum field

[0044]

[0045] Table 4 Indoor biological test of ternary herbicidal composition on digitaria sanguinalis in sorghum field

[0046]

[0047] Example 3 Formulation of ternary herbicidal composition

[0048] Formulation 1: 40% dimethanate-dichloran-terbucarb suspending emulsion, comprising the following components by weight percentage: dimethanate-isoctyl ester 10%, dichloran 10%, terbucarb 20%, Tween 80 5%, NS-500LQ 3%, Atlox-4916 4%, calcium lignosulphonate 4%, methyl oleate 10%, water to 100%;

[0049] The preparation process is as follows Figure 1 : wherein the dimethanate-isoctyl ester TC is a flowable liquid at room temperature, but the viscosity is slightly large, and needs to be diluted with an organic solvent.

[0050] Formulation 2: 40% dimethanate-dichloran-terbucarb suspending emulsion, comprising the following components by weight percentage: dimethanate-isoctyl ester 10%, dichloran 10%, terbucarb 20%, Tween 80 5%, agricultural emulsion 500# 3%, SP-SC3 4%, calcium lignosulphonate 4%, methyl oleate 10%, water to 100%;

[0051] The preparation method is the same as that of formulation 1.

[0052] Formulation 3: 40% dimethanate-dichloran-terbucarb dispersible oil suspending agent, comprising the following components by weight percentage: dimethanate-isoctyl ester 10%, dichloran 10%, terbucarb 20%, agricultural emulsion 500# 6%, calcium lignosulphonate 3%, sodium dodecyl sulfate 5%, Tween 80 3%, methyl oleate to 100%.

[0053] Formulation 4: 30% dimethanate-dichloran-terbucarb dispersible oil suspending agent, comprising the following components by weight percentage: dimethanate-isoctyl ester 10%, dichloran 10%, terbucarb 10%, agricultural emulsion 500# 5%, calcium lignosulphonate 3%, sodium dodecyl sulfate 3%, Tween 80 2%, methyl oleate to 100%.

[0054] Example 4 Field control effect of ternary herbicide on weeds in sorghum field

[0055] Test site: test base of Chifeng Institute of Agricultural and Pastoral Science. Weed types in sorghum field: crabgrass, barnyard grass, dogtail grass, gooseweed, and amaranthus retroflexus.

[0056] Tested agents: formulations 1-4 in example 3;

[0057] Test method: plot area 35 m2, random block arrangement, 4 times of each treatment, with water control. Manual stem and leaf spraying was used, with 450 kg of water per hectare; 14 days after spraying, fresh weight control effect was investigated, with 4 points per plot, 0.5 m2 per point, investigating the aboveground fresh weight of weeds, and calculating the fresh weight control effect.

[0058] Fresh weight control effect = (fresh weight of weeds in control area-fresh weight of weeds in treatment area) / fresh weight of weeds in control area x 100%.

[0059] Results and analysis:

[0060] From Table 5, the formulations 1-3 have excellent control effect on the weeds in the sorghum field when the dosage is 100 g / mu, or the formulation 4 has excellent control effect on the weeds in the sorghum field when the dosage is 110 g / mu, and the control effects are all greater than 90%. In particular, the control effect of the formulation 1 on the weeds in the sorghum field is 98.8%; that is, the adjuvant formula in the emulsifiable concentrate of the formulation 1 has a better promoting and improving effect on the drug efficacy, and the specific reason needs to be further studied.

[0061] Table 5 Field control effect of ternary herbicide on weeds in sorghum field

[0062] Agent Formulation dose g / acre Fresh weight control effect % Formulation 1 90 98.8a Formulation 2 90 92.1b Formulation 3 90 92.0b Formulation 4 100 93.0b CK - -

[0063] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them.

Claims

1. A herbicidal composition comprising dimethachlor, quinclorac and terbumeton, characterized in that, The active ingredients include dimethenamid-isoctyl, quinclorac and terbuthylazine in a mass ratio of 1:1:1 or 1:1:

2.

2. The herbicidal composition according to claim 1, characterized by The herbicidal composition contains 1-85% of the active ingredients and a pesticide-acceptable auxiliary ingredient.

3. The herbicidal composition according to claim 2, characterized by The auxiliary ingredient includes one or more of dispersants, wetting agents, emulsifiers, thickeners, binders, disintegrants, preservatives, co-solvents, antifreezes, fillers, and solvents.

4. The herbicidal composition according to claim 3, characterized by The herbicidal composition is in the form of dispersible oil suspensions, wettable powders, water dispersible granules, or suspoemulsions.

5. Use of the herbicidal composition according to any one of claims 1-4 for controlling weeds in crop fields.

6. Use according to claim 5, characterized in that, The crop is sorghum, and the weeds are grass weeds, broadleaf weeds, and sedge weeds.

7. Use according to claim 6, characterized in that, The weeds are Echinochloa crus-galli, Digitaria sanguinalis, Eleusine indica, Chenopodium album, Amaranthus retroflexus, or Brassica campestris.

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