Sorghum field herbicide and application thereof

Abstract

The invention relates to a sorghum field herbicide and application thereof, and relates to the technical field of pesticides, the sorghum field herbicide comprises the following active ingredients: dichloro-clomazone, terbuthylazine and saflufenacil, and the weight ratio of dichloro-clomazone to terbuthylazine to saflufenacil is (1.2-3.6): (24-40): (0.7-2.1). The herbicide is suitable for weeding after sorghum sowing and before seedling, has a good synergistic effect on annual weeds in a sorghum field, and is safe to sorghum. The herbicide is an ideal novel herbicide for controlling annual weeds in sorghum fields.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides, and relates to a sorghum field herbicide and its application, which is composed of three effective ingredients: clomazone, terbuthylazine and saflufenacil. It is suitable for soil spraying after sowing and before seedlings in sorghum fields, can effectively prevent and kill annual weeds in sorghum fields, and is safe for sorghum. Background Art

[0002] Bixlozone is an isoxazolinone herbicide developed by FMC Corporation of the United States. It is a selective pre-emergence or early post-emergence treatment agent that can be absorbed by plant roots and young shoots and transmitted upward to various parts of the plant with transpiration. Its mechanism of action is to inhibit the action of 1-deoxy-D-xylulose 5-phosphate synthase, thereby destroying the biosynthesis of plastid isoprenoids, hindering the synthesis of carotenoids, and then inhibiting the biosynthesis of chlorophyll in sensitive weeds. Sensitive weeds cannot metabolize bixlozone and eventually cannot photosynthesize and die. It can prevent and control grass weeds and broadleaf weeds.

[0003] Terbuthylazine is a selective systemic herbicide that mainly inhibits electron transfer in photosynthesis. After terbuthylazine is absorbed by plants, it is conducted in the apoplast system, enters the chloroplast thylakoid membrane through the xylem, and binds to the QB protein in the photosynthesis electron transport chain, destroying the function of the QB protein and preventing it from continuing to transfer electrons, ultimately hindering photosynthesis and causing death. It can prevent and control most annual broadleaf weeds and grass weeds. It can be applied before or after germination, and the effective period in the soil is 3-10 weeks.

[0004] Saflufenacil is a pyrimidinedione herbicide developed by BASF. It is a protoporphyrinogen oxidase inhibitor that destroys chlorophyll synthesis by preventing the conversion of protoporphyrinogen IV to protoporphyrin IV during chlorophyll biosynthesis, ultimately inhibiting growth until the plant dies. Saflufenacil has high activity, foliar contact and soil residual activity, fast efficacy, long residual effect, and safety to crops. It is suitable for non-arable land, directional spraying in orchards, large-seed broad-leaved crops such as soybeans, and small-seed gramineous crops such as wheat.

[0005] Sorghum is sensitive to many chemical herbicide varieties. Currently, there are few herbicides registered for use on sorghum in China, and the varieties are single. In particular, the varieties of post-sowing and pre-seedling soil sealing treatment agents only have two active ingredients, isopropylamine and atrazine. In actual use, there may be problems such as single prevention and control targets and poor comprehensive weed prevention effects, or improper use can easily cause serious pesticide damage risks to sorghum, or large amounts of atrazine are used, with high residues, and pesticide damage risks to subsequent crops and ecological risks, etc. In addition, long-term use of a single variety of herbicides can easily increase the level of weed resistance.

[0006] Compounding pesticide active ingredients with different mechanisms of action is an effective way to develop and research new pesticides. Different pesticide active ingredients usually show three types of action after compounding: antagonism, addition and synergism. Based on the purpose of integrated weed control in sorghum fields and the current lack of safe and efficient herbicides that can be applied to sorghum fields on the market, the inventors conducted a large number of experiments and found that when clomazone, terbuthylazine and saflufenacil were compounded in a certain weight ratio, they showed obvious synergistic effects on annual grass weeds and broad-leaved weeds in sorghum fields, such as foxtail grass, hairy crabgrass and field bindweed. At the same time, there are currently no registrations or related reports on the market for clomazone, terbuthylazine and saflufenacil compound sorghum field herbicides. Summary of the invention

[0007] In view of this, it is necessary for the present invention to provide a ternary compound herbicide for controlling annual weeds in sorghum fields. The three active ingredients of clomazone, terbuthylazine and saflufenacil are compounded to show a synergistic effect, which can improve the comprehensive control effect on annual weeds in sorghum fields.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] The invention provides a herbicide containing three effective ingredients of clomazone, terbuthylazine and saflufenacil, wherein the weight ratio of clomazone, terbuthylazine and saflufenacil is 1.2-3.6:24-40:0.7-2.1.

[0010] Preferably, the weight ratio of clomazone, terbuthylazine and saflufenacil is 2.4:32:1.4.

[0011] Furthermore, in the above composition, the three active ingredients of clomazone, terbuthylazine and saflufenacil account for 20-50% of the total weight percentage content, and preferably, the three active ingredients of clomazone, terbuthylazine and saflufenacil account for 35.8% of the total weight percentage content.

[0012] The preparation of the sorghum field herbicide of the present invention is in the form of a suspension concentrate.

[0013] Furthermore, the auxiliary agent component in the suspension comprises one or a combination of multiple of a dispersant, a wetting agent, an antifreeze agent, a thickener, a preservative, a stabilizer, a penetrant, and a defoaming agent.

[0014] The present invention also provides an application of the sorghum field herbicide mentioned above, which is to use the sorghum field herbicide to spray the soil after sorghum is sown and before sorghum seedlings to prevent annual weeds, especially to prevent weeds such as foxtail grass, hairy crabgrass, field bindweed, etc.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The herbicide of the present invention has an obvious synergistic effect after the active ingredients of clomazone, terbuthylazine and saflufenacil are compounded and used. Compared with a single ingredient, the herbicide can improve the control effect on annual weeds, especially on foxtail grass, hairy crabgrass and field bindweed.

[0017] The effective ingredients clomazone, terbuthylazine and saflufenacil in the present invention have different herbicidal action mechanisms and can delay the development of weed resistance.

[0018] The rational application of the herbicide after sorghum sowing and before sorghum emergence is beneficial to achieving the goals of cost saving, increasing efficiency and increasing crop yields. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements, and equivalents within the scope of the claims.

[0020] Bioassay Example 1:

[0021] The bioassay embodiment of the present invention adopts a method of combining indoor activity determination test and field test.

[0022] First, a greenhouse potted plant activity test was conducted on the above herbicide combination to compare the herbicidal activities between the combinations and between the combination and a single agent, so as to determine the optimal ratio range of the combination.

[0023] Test name: Indoor activity test of the combination of clomazone, terbuthylazine and saflufenacil.

[0024] Test targets: Setaria viridis, Digitaria tangutica, and Bindweed seeds, all of which were collected from sorghum fields and stored in the laboratory for future use.

[0025] Test agents and preparation: 96% clomazone technical, 97% terbuthion technical, 97% saflufenacil technical, all of which are commercially available. Weigh a certain amount of technical, select a suitable organic solvent to dissolve it into a mother solution, and dilute it to the test dose with distilled water containing 0.1% Tween-80 according to the set dose for treatment.

[0026] Soil spraying was performed after sowing and before seedlings emerged, with 4 replicates for each treatment and a blank control. After treatment, the plants were cultured in a greenhouse and the plant reaction symptoms (target damage symptoms and growth inhibition) were observed regularly. The fresh weight of the aboveground part was calculated 42 days after the drug was applied, and the activity of the drug on the target was evaluated by the fresh weight inhibition rate.

[0027] Evaluation of joint action: The joint action mode of herbicides was evaluated according to the Colby method (NY / T1155.7-2006). The calculation formula is: e0 = a × b × c / 100 (3-1) In the formula, a, b, c represent the actual weed survival rates of agent 1, agent 2, and agent 3, respectively; e0 is the theoretical weed survival rate after a, b, and c are mixed; e is the actual weed survival rate after a, b, and c are mixed;

[0028] The test investigated the weed fresh weight control effect (i.e. fresh weight inhibition rate), which can be converted into E0 = 100-(100-A)×(100-B)×(100-C) / 100 (3-1) . In the formula, A, B, and C represent the measured control effects of agent 1, agent 2, and agent 3, respectively; E0 is the theoretical control effect after a, b, and c are mixed; E is the measured control effect after A, B, and C are mixed; when E-E0>10%, it means that the mixed agents produce a synergistic effect, and the larger the value, the more significant the synergistic effect; when E-E0<-10%, it means that the mixed agents produce an antagonistic effect; and when the value of E-E0 is between ±10%, it means that the mixed agents produce an additive effect.

[0029] The indoor activities and combined action types of clomazone, terbuthylazine and saflufenacil alone and in combination against Setaria viridis, Digitaria tangutica and Bindrum truncatum are shown in Tables 1 and 2, respectively.

[0030] Table 1: Indoor activity of clomazone, terbuthylazine and saflufenacil alone and in combination against Setaria viridis and Digitaria tangutica and types of combined action

[0031]

[0032] Table 2: Indoor activity of clomazone, terbuthylazine and saflufenacil alone and in combination against field bindweed and types of combined action

[0033]

[0034] According to Tables 1 and 2, the indoor activities of clomazone, terbuthylazine and saflufenacil alone and in combination on Setaria viridis, hairy horsetail and field bindweed, as well as the types of combined effects of the combined effects, it was found that clomazone, terbuthylazine and saflufenacil produced synergistic or positive additive effects on Setaria viridis, hairy horsetail and field bindweed within the experimental ratio range. This shows the rationality and feasibility of the three-way combination of clomazone, terbuthylazine and saflufenacil.

[0035] At the same time, the value of E-E0 can be used to evaluate the significance of the synergistic effect. It is obvious that the combination of clomazone, terbuthylazine and saflufenacil in the ratio of 54:720:31.5, i.e. 2.4:32:1.4, has the most significant synergistic effect on Setaria viridis, Digitaria tangutica and Bindweed.

[0036] Several examples of the preparations of the present invention and comparative examples are specifically listed below to further demonstrate the advantages of the present invention, but the present invention is not limited thereto. Unless otherwise specified, the percentages in the following examples are all weight percentages.

[0037] Formulation Example 1: 35.8% clomazone, terbuthylazine, and saflufenacil suspension (2.4:32:1.4):

[0038] 35.8% clomazone, terbuthylazine, and saflufenacil suspension, the formula is as follows: 2.4% clomazone, 32% terbuthylazine, 1.4% saflufenacil, dispersant sodium alkyl naphthalene sulfonate formaldehyde condensate 4%, wetting agent isotridecyl alcohol polyoxyethylene ether 1%, thickener magnesium aluminum silicate 0.5%, xanthan gum 0.1%, antifreeze agent ethylene glycol 5%, defoaming agent silicone 0.1%, preservative isothiazolinone 0.1%, and water is made up to 100%.

[0039] The preparation method is as follows: water, dispersant, wetting agent, magnesium aluminum silicate, xanthan gum, antifreeze agent, defoamer, and preservative are added into a reaction kettle, fully mixed and dispersed evenly, diclofenac, terbuthylazine, and saflufenacil technical are added under shearing, and sand milling is started after even shearing to obtain a material particle size D 90 ≤5um, that is, 35.8% clomazone, terbuthylazine, and saflufenacil suspension was obtained.

[0040] Formulation Example 2: 41.9% clomazone, terbuthylazine, and saflufenacil suspension (1.2:40:0.7):

[0041] 41.9% clomazone, terbuthylazine, and saflufenacil suspension, the formula is as follows: 1.2% clomazone, 40% terbuthylazine, 0.7% saflufenacil, 4.2% dispersant sodium alkyl naphthalene sulfonate formaldehyde condensate, 0.9% wetting agent isotridecyl alcohol polyoxyethylene ether, 0.3% thickener magnesium aluminum silicate, 0.1% xanthan gum, 5% antifreeze agent ethylene glycol, 0.1% defoaming agent silicone, 0.1% preservative isothiazolinone, and water is made up to 100%.

[0042] The preparation method is the same as Example 1.

[0043] Formulation Example 3: 29% clomazone, terbuthylazine, and saflufenacil suspension (3.6:24:1.4):

[0044] 29% clomazone, terbuthylazine, and saflufenacil suspension, the formula is as follows: 3.6% clomazone, 24% terbuthylazine, 1.4% saflufenacil, 3% dispersant sodium alkyl naphthalene sulfonate formaldehyde condensate, 1% wetting agent isotridecyl alcohol polyoxyethylene ether, 0.6% thickener magnesium aluminum silicate, 0.12% xanthan gum, 5% antifreeze agent ethylene glycol, 0.1% defoaming agent silicone, 0.1% preservative isothiazolinone, and water is made up to 100%.

[0045] The preparation method is the same as Example 1.

[0046] Comparative formulation ratio 1: 21.5% clomazone, terbuthylazine, and saflufenacil suspension concentrate (1.0:20:0.5);

[0047] 21.5% clomazone, terbuthylazine, and saflufenacil suspension, the formula is as follows: 1.0% clomazone, 20% terbuthylazine, 0.5% saflufenacil, 3.3% dispersant sodium alkyl naphthalene sulfonate formaldehyde condensate, 1% wetting agent isotridecyl alcohol polyoxyethylene ether, 0.6% thickener magnesium aluminum silicate, 0.12% xanthan gum, 5% antifreeze agent ethylene glycol, 0.1% defoaming agent silicone, 0.1% preservative isothiazolinone, and water is made up to 100%.

[0048] Comparative formulation 2: 26% clomazone, terbuthion, and saflufenacil suspension concentrate (3.7:20:2.3);

[0049] 26% clomazone, terbuthylazine, saflufenacil suspension, the formula is as follows: 3.7% clomazone, 20% terbuthylazine, 2.3% saflufenacil, 4% dispersant sodium alkylnaphthalene sulfonate formaldehyde condensate, 1.2% wetting agent isotridecyl alcohol polyoxyethylene ether, 0.6% thickener magnesium aluminum silicate, 0.12% xanthan gum, 5% antifreeze agent ethylene glycol, 0.1% defoaming agent silicone, 0.1% preservative isothiazolinone, and water is supplemented to 100%. Bioassay Example 2: Field efficacy test for controlling annual weeds in sorghum fields

[0050] Test drug:

[0051] (1) Formulation Example 1: 35.8% clomazone, terbuthylazine, and saflufenacil suspension (2.4:32:1.4)

[0052] (2) Formulation Example 2: 41.9% clomazone, terbuthylazine, and saflufenacil suspension (1.2:40:0.7)

[0053] (3) Formulation Example 3: 29% clomazone, terbuthylazine, and saflufenacil suspension (3.6:24:1.4)

[0054] (4) Comparative Example 1: 21.5% clomazone, terbuthylazine, and saflufenacil suspension (1.0:20:0.5)

[0055] (5) Comparative Example 2: 26% clomazone, terbuthylazine, and saflufenacil suspension (3.7:20:2.3)

[0056] (6) Control 1: 36% clomazone suspension

[0057] (7) Control 2: 50% terbuthylazine suspension

[0058] (8) Control 3: 70% benzylsulfuron water dispersible granules

[0059] (9) Control 4: 36% clomazone suspension + 50% terbuthylazine suspension

[0060] (10) Control 5: 36% clomazone suspension + 70% saflufenacil water dispersible granules

[0061] (11) Control 6: 50% terbuthylazine suspension + 70% saflufenacil water dispersible granules

[0062] CK: blank control

[0063] Test 1:

[0064] Location: Hejiang County, Luzhou City, Sichuan Province.

[0065] In the previous year, barnyard grass, foxtail grass, crabgrass, Palmer amaranth, field bindweed, and nightshade all occurred in the experimental site and surrounding areas, and the situation was quite serious. The experimental sorghum variety was Jinnuo 102.

[0066] The experiment was repeated 4 times for each treatment, and each treatment plot was 10m 2 , arranged in random blocks, each agent was diluted with 15L of water per mu according to the recommended dosage, and sprayed evenly on the soil surface.

[0067] Survey method: Randomly select 4 points in each community, and survey 0.25m at each point 2 , investigate the fresh weight of aboveground weeds 42 days after application. Since weeds in the blank control area are mostly grass and broadleaf weeds, and there are many types, the test investigation first classified the grass and broadleaf weeds into major categories, and characteristically selected grass weeds Setaria viridis and Digitaria tanguta and broadleaf weeds Field bindweed for test investigation, and calculated the aboveground fresh weight control effect respectively. The test results are shown in Table 3.

[0068] Table 3: Weed control efficacy in sorghum fields 42 days after application and safety test results of sorghum (Jinnuo 102)

[0069]

[0070] Test 2:

[0071] Location: Jinsha County, Bijie City, Guizhou Province. In the previous year, barnyard grass, goosegrass, crabgrass, nightshade, field bindweed, and quinoa all occurred in the test site and surrounding areas, and the infestation was relatively serious. The test sorghum variety was red cherry.

[0072] The experiment was repeated 4 times for each treatment, and each treatment plot was 10m 2 , arranged in random blocks, each agent was diluted with 15L of water per mu according to the recommended dosage, and sprayed evenly on the soil surface.

[0073] Survey method: Randomly select 4 points in each community, and survey 0.25m at each point 2 , investigate the fresh weight of aboveground weeds 42 days after application. The occurrence of Gramineae weeds in the blank control area was more serious. Therefore, the same test investigation was first conducted according to the Gramineae and broadleaf weeds, and Gramineae weeds and field bindweed were characteristically selected for test investigation, and the aboveground fresh weight control effect was calculated respectively. The test results are shown in Table 4.

[0074] Table 4: Results of weed control efficacy in sorghum fields and safety test of sorghum (red cherry) 42 days after application

[0075]

[0076] As can be seen from Table 3 and Table 4, the formulation examples 1 to 3 have good control effects on grass weeds such as Setaria viridis, Digitaria tangutica, and broad-leaved weeds such as Bindweed, and the effective period is long. The control effects of grass weeds and broad-leaved weeds 42 days after application are better than those of the two formulation comparison examples.

[0077] Compared with the blank control, and the single agent of the control agent 36% clomazone suspension, 50% terbuthylazine suspension, 70% saflufenacil water dispersible granules; and the two-component mixed use combination of 36% clomazone suspension + 50% terbuthylazine suspension, 36% clomazone suspension + 70% saflufenacil water dispersible granules, 50% terbuthylazine suspension + 70% saflufenacil water dispersible granules, the control effect on grass weeds and broadleaf weeds was significantly improved. Within the scope of the drug used in this experiment, it is safe for sorghum.

[0078] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A sorghum field herbicide, characterized in that: The invention contains three effective ingredients: clomazone, terbuthylazine and saflufenacil, wherein the weight ratio of clomazone, terbuthylazine and saflufenacil is 1.2-3.6:24-40:0.7-2.

1.

2. The sorghum field herbicide according to claim 1, characterized in that: The weight ratio of clomazone, terbuthylazine and saflufenacil is 2.4:32:1.

4.

3. The sorghum field herbicide according to claim 2, characterized in that: The three effective ingredients of clomazone, terbuthylazine and saflufenacil account for 20-50% of the total weight percentage.

4. The sorghum field herbicide according to claim 3, characterized in that: The total weight percentage of the three active ingredients of clomazone, terbuthylazine and saflufenacil is 35.8%.

5. The sorghum field herbicide according to claim 1, characterized in that: The preparation of the sorghum field herbicide is in the form of a suspension concentrate.

6. The sorghum field herbicide according to claim 5, characterized in that: The auxiliary agent components in the suspension include one or more of a dispersant, a wetting agent, an antifreeze agent, a thickener, a preservative, a stabilizer, a penetrant, and a defoaming agent.

7. The use of the sorghum field herbicide according to any one of claims 1 to 6, characterized in that: The invention relates to an application of using the sorghum field herbicide to spray the soil after sorghum is sown and before sorghum seedlings emerge to prevent and kill annual weeds.

8. The use of the sorghum field herbicide according to claim 7, characterized in that: The annual weeds are a combination of one or more of Setaria viridis, Digitaria tangutica and Bindweed.

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