Ternary weeding composition containing 2-methyl-4-chlorophenoxyacetic acid sodium, tembotrione and bensulfuron methyl

Abstract

The ternary weeding composition containing 2-methyl-4-chlorophenoxyacetic acid sodium, tembotrione and bensulfuron methyl provided by the invention is reasonable in component formula, has a remarkable synergistic effect, and can expand the weed control spectrum of a single agent and a binary mixture, reduce the dosage of each effective component, reduce the pesticide application frequency, reduce the control cost and delay the resistance. The ternary weeding composition disclosed by the invention can be prepared into solid dosage forms such as wettable powder, water dispersible granules, granules and the like. The weeding composition disclosed by the invention has the advantages of simple preparation process, low preparation residue, no pollution to crops and good safety, meets the safety requirements of pesticide preparations, and can be used for preventing and killing off annual gramineous weeds, broadleaf weeds and cyperaceae weeds such as barnyard grass, leersia oryzae, scirpus tabernaemontani, sagittaria trifolia and rhizoma alismatis in northeast transplanted paddy fields.

Description

Technical Field

[0001] The present invention relates to a weeding composition for paddy fields, which is composed of an active ingredient of sodium MCPA, mesotrione and bensulfuron-methyl and auxiliaries, and belongs to the technical field of compound pesticides. Background Art

[0002] Rice is one of the main food crops in the world, with a planting area of about 150 million hectares. Rice is also the most important food crop in China, ranking first in terms of both planting area and yield among food crops in China. However, there are many types of weeds in paddy fields. There are more than 200 kinds of weeds that can cause harm, among which more than 40 kinds of gramineous weeds, broad-leaved weeds and sedges cause serious harm, including weeds with a large harmful area such as barnyard grass, leptochloa chinensis, monochoria vaginalis, potamogeton distinctus, monochoria korsakowii, and cyperus difformis. Commonly seen ones also include sagittaria pygmaea, agrostis matsumurae, ammannia baccifera, ceratophyllum demersum, eclipta prostrata, and scutellaria barbata. The application of chemical herbicides can reduce production costs and increase paddy field yields, and is the most important means of weed control.

[0003] Bensulfuron-methyl, with the chemical name of methyl 2-{[(4,6-dimethoxypyrimidin-2-yl)aminocarbonylamino]sulfonylmethyl}benzoate, is a selective systemic herbicide that can be absorbed by the roots and leaves of weeds and transferred to other parts, hindering the biosynthesis of branched-chain amino acids. The growth function of sensitive weeds is blocked, and the young tissues turn yellow prematurely, inhibiting the growth of leaves and roots. Bensulfuron-methyl can effectively control annual and perennial broad-leaved weeds and sedges in paddy fields, especially has a special effect on malignant weeds such as cyperus rotundus, sagittaria trifolia, and potamogeton distinctus, only has an inhibitory effect on barnyard grass, and is safe for rice.

[0004] Mesotrione, with the chemical name of 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl}-1,3-cyclohexanedione, is a triketone herbicide developed by Bayer in 2004. It is an HPPD inhibitor, can be well absorbed by weeds and transported in the body, and has stable metabolism. It can effectively control main broad-leaved weeds and some gramineous weeds, such as having good control effects on abutilon theophrasti, amaranthus tricolor, chenopodium album, polygonum hydropiper, barnyard grass, and digitaria sanguinalis, and can be used for pre-emergence soil sealing treatment and post-emergence foliar treatment.

[0005] Sodium MCPA, with the chemical name of sodium 2-methyl-4-chlorophenoxyacetate, is a hormone-type selective herbicide with strong systemic and conductive properties. It can penetrate the cutin and cytoplasmic membranes of weeds and be absorbed and conducted by the roots and leaves, and can be used for post-emergence control of various annual or perennial broad-leaved weeds and some monocotyledonous weeds. It has a special effect on killing cyperus rotundus, monochoria vaginalis, alisma orientale, sagittaria trifolia and other broad-leaved weeds.

[0006] Chinese Patent Application CN103392710A discloses a corn field herbicide compounded with mesotrione. Its second active ingredient can be various other herbicides including sodium MCPA, but does not disclose the specific composition of the compound of mesotrione and sodium MCPA. Chinese Patent Applications CN103283749A and CN103283758A respectively disclose herbicidal compositions of tribenuron-methyl, sodium MCPA and bensulfuron-methyl, and thifensulfuron-methyl, sodium MCPA and bensulfuron-methyl. Currently, there is no ternary herbicidal composition compounded with sodium MCPA, mesotrione and bensulfuron-methyl.

[0007] The compounding of herbicides can expand the control range, improve the herbicidal speed, and delay the emergence of weed resistance, which is an important means for the integrated control of weeds. At present, there is still a need to develop compound herbicides suitable for paddy fields to improve the weed control effect, reduce the use cost, and increase the economic benefits on the basis of ensuring the safety of crops. Summary of the Invention

[0008] To solve the above technical problems, the present invention provides a ternary herbicidal composition containing sodium MCPA, mesotrione and bensulfuron-methyl.

[0009] Through a large number of indoor formulation screenings and field efficacy tests, the inventors of the present invention found that for transplanted paddy fields in Northeast China, compounding sodium MCPA, mesotrione and bensulfuron-methyl within a certain range and performing soil sealing treatment 3 - 5 days after rice transplantation has a good control effect on annual weeds in paddy fields. One application can preferably control annual gramineous weeds, broad-leaved weeds and cyperaceae weeds such as barnyardgrass, Leersia oryzoides, Scirpus validus, Sagittaria trifolia, and Alisma plantago-aquatica. The compounding of the three active ingredients can produce a synergistic effect, reduce the dosage of a single active ingredient, expand the herbicidal spectrum of single agents and mixtures, solve the problem of poor effects of single components on barnyardgrass, Leersia oryzoides, Scirpus validus and broad-leaved weeds, reduce the secondary occurrence base of weeds, and is safe for rice.

[0010] The ternary herbicidal composition of the present invention includes a first active ingredient, sodium MCPA; a second active ingredient, mesotrione; a third active ingredient, bensulfuron-methyl; and the weight ratio of the first active ingredient, the second active ingredient to the third active ingredient is (0.1 - 90):(0.1 - 90):(0.5 - 90), preferably (0.2 - 50):(0.2 - 50):(2 - 50).

[0011] The ternary herbicidal composition of the present invention can be formulated into wettable powders, water dispersible granules, and granules according to methods well known to those skilled in the art.

[0012] For wettable powders, the auxiliaries that can be used are: one or more of dispersants such as polycarboxylates, lignosulfonates, polyoxyethylene polyoxypropylene block copolymers, alkylnaphthalene formaldehyde condensate sulfonates, alkylphenol polyoxyethylene ether phosphates, fatty alcohol polyoxyethylene ether phosphates, alkylphenol polyoxyethylene ether sulfonates, etc.; one or more of wetting agents such as alkyl sulfates, alkyl sulfonates, naphthalene sulfonates, etc.; one or more of fillers such as ammonium sulfate, urea, sucrose, glucose, diatomaceous earth, kaolin, white carbon black, light calcium carbonate, talc powder, attapulgite clay, pottery clay, etc.

[0013] For water-dispersible granules, the auxiliaries that can be used are: one or more of dispersants such as polycarboxylates, lignosulfonates, alkylnaphthalene sulfonates, etc.; one or more of wetting agents such as alkyl sulfates, alkyl sulfonates, naphthalene sulfonates, etc.; one or more of disintegrants such as ammonium sulfate, sodium sulfate, polyvinylpyrrolidone, starch and its derivatives, bentonite, etc.; one or more of binders such as starch, glucose, polyvinyl alcohol (PVA), polyethylene glycol, sodium carboxymethyl cellulose, sucrose, etc.; one or more of fillers such as diatomaceous earth, kaolin, white carbon black, light calcium carbonate, talc powder, attapulgite clay, pottery clay, etc.

[0014] For granules, the auxiliaries that can be used are: one or more of carriers such as clay, kaolin, talc, calcium carbonate, corn starch, aluminum silicate, etc.; one or more of dispersants such as polycarboxylates, lignosulfonates, alkylnaphthalene sulfonates, etc.; one or more of wetting agents such as alkyl sulfates, alkyl sulfonates, naphthalene sulfonates, etc.; one or more of binders such as polyvinyl alcohol, dextrin, polyvinylpyrrolidone, etc.

[0015] Adopting the above technical solutions, the beneficial effects of the present invention are as follows:

[0016] (1) The present invention adopts a compounding scheme of three active ingredients with a reasonable component formulation. Its activity and weeding effect are not a simple superposition of the activities of each component. Compared with the existing single preparations, in addition to having a significant weeding effect, it also has a significant synergistic effect. The control effect is better than the activity when each component is applied alone, can expand the weed control spectrum of single agents and binary mixtures, reduce the dosage of each active ingredient, reduce the number of spraying times, reduce the control cost, and delay resistance.

[0017] (2) The ternary herbicidal composition of the present invention can be prepared into solid dosage forms such as wettable powders, water-dispersible granules, granules, etc. The preparation has less residue, is pollution-free to crops, has good safety, and meets the safety requirements of pesticide preparations.

[0018] (3) The ternary herbicidal composition of the present invention is used for controlling annual gramineous weeds, broad-leaved weeds and cyperaceae weeds such as barnyard grass, Leersia oryzoides, Scirpus validus, Sagittaria trifolia, Alisma orientale in transplanted rice fields in Northeast China. Specific embodiments

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] 1. Indoor screening test of the mixed ratio of dimethyltetrachloride, tampronil and benzylsulfuron-methyl

[0021] In greenhouse, weeds were cultivated in pots, and the herbicidal effects of different mixtures of dimethyltetrachloride, tampoxone and benzylsulfuron-methyl were compared. The type of combined action after the mixture was evaluated by Colby method.

[0022] Test weeds: Echinochloa crusgalli

[0023] Test method: sow barnyard grass seeds in a 10cm diameter flower pot, cover with 0.5cm soil after sowing, add water to the bottom of the flower pot and infiltrate upward to completely moisten the soil, and use conventional methods to wait until buds emerge. The prepared materials are randomly divided into a treatment group and a control group. The treatment group is sprayed with an automatic sprayer according to the designed dosage of the test, and the control group is not treated. The test is repeated 4 times. After the test materials are treated, they are placed in a greenhouse and managed according to conventional methods.

[0024] Investigation method: 21 days after treatment, the fresh weight of the aboveground part of the treatment group and the control group was weighed, the actual weed survival rate (%) was calculated, and the toxic effect of the pesticide on the weeds was evaluated.

[0025]

[0026] The Colby method was used to evaluate the combined action mode of herbicides, and the formula is as follows:

[0027] E0=X×Y×Z / 100 2

[0028] Where:

[0029] X is the actual weed survival rate of the target weeds when sodium tetrachloride is used alone at a certain dosage;

[0030] Y is the actual weed survival rate of the target weeds when tembotrione is used alone at a certain dose;

[0031] Z is the actual weed survival rate of the target weeds when bensulfuron-methyl is used alone at a certain dose;

[0032] E0 is the theoretical weed survival rate calculated according to the above formula;

[0033] E is the actual weed survival rate.

[0034] Evaluation criteria: E0 - E < -10% indicates antagonistic effect; -10% ≤ E0 - E ≤ 10% indicates additive effect; E0 - E > 10% indicates synergistic effect.

[0035] The test results are shown in Table 1:

[0036]

[0037] From the above data, it can be seen that there is no antagonistic effect after the mixture of MCPA-sodium, mesotrione, and bensulfuron-methyl. Among them, the two ratios of 4 + 5 + 2 and 6 + 3 + 2 show synergistic effects, and the other ratios show additive effects.

[0038] II. Preparation Examples of Formulations

[0039] Formulation Example 1: 22% MCPA-sodium · mesotrione · bensulfuron-methyl wettable powder

[0040] By mass percentage, weigh 8% MCPA-sodium, 10% mesotrione, 4% bensulfuron-methyl, 5% alkylnaphthalenesulfonate formaldehyde condensate, 5% sodium lignosulfonate, 2% alkylsulfonate, 5% diatomaceous earth, and kaolin is added to 100%. The above raw materials are mixed and pulverized by air flow to obtain 22% MCPA-sodium · mesotrione · bensulfuron-methyl wettable powder.

[0041] Formulation Example 2: 22% MCPA-sodium · mesotrione · bensulfuron-methyl water dispersible granules

[0042] By mass percentage, weigh 8% MCPA-sodium, 10% mesotrione, 4% bensulfuron-methyl, 5% alkylnaphthalenesulfonate formaldehyde condensate, 4% sodium lignosulfonate, 1% Nekal BX (sodium dibutylnaphthalenesulfonate), 2% alkylsulfonate, and kaolin is added to 100%. The above raw materials are mixed, ultrafinely pulverized by air flow, mixed for the second time, and granulated to obtain 22% MCPA-sodium · mesotrione · bensulfuron-methyl water dispersible granules.

[0043] Formulation Example 3: 22% MCPA-sodium · mesotrione · bensulfuron-methyl granules

[0044] By mass percentage, weigh 8% MCPA-sodium, 10% mesotrione, 4% bensulfuron-methyl, 5% sodium alkylnaphthalenesulfonate, 4% alkylsulfonate, 3% polyvinylpyrrolidone, and talcum powder is added to 100%. The above raw materials are uniformly mixed in a mixing tank and processed through extrusion, granulation, drying, and screening steps to obtain 22% MCPA-sodium · mesotrione · bensulfuron-methyl granules.

[0045] The dosage of the active ingredients in the above three formulation examples can also be changed to 12% MCPA-sodium, 6% mesotrione, and 4% bensulfuron-methyl, with the rest remaining unchanged.

[0046] III. Field Weed Control Test

[0047] A weed control test of the 22% MCPA-Na·mesotrione·bensulfuron-methyl wettable powder of Example 1 was carried out in a transplanted rice field in the suburbs of Shenyang. The main weed communities in the field were barnyard grass, Leersia oryzoides, Scirpus validus, Sagittaria trifolia, Alisma plantago-aquatica, etc., which were relatively evenly distributed, and the weed leaf age was in the 2-4 leaf stage. And a water treatment was set as a blank control (CK). Each treatment was repeated 4 times, and the area of each plot was about 20m 2 , randomly arranged, and ridges were built between each plot for isolation. The medicine was applied by the conventional spraying method. The control effect of weed plants was investigated 30 days after the application of the medicine, and the phytotoxicity of rice was continuously observed. The test data are shown in the following table.

[0048]

[0049] The lowercase letters in the control effect column indicate significant differences at the p<0.05 level

[0050] Thus, it can be seen that the 22% MCPA-Na·mesotrione·bensulfuron-methyl wettable powder of Example 1 of the present application can effectively control various weeds in the rice field. Compared with the preparations with a single active ingredient, the control effect is significantly improved, and the dosage of herbicides can also be effectively reduced.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ternary herbicidal composition containing dimethyltetrachloride sodium, tampronil and benzylsulfuron-methyl, characterized in that: The weight ratio of dimethyltetrachloride sodium, tampoxone and benzylsulfuron-methyl is (0.1-90):(0.1-90):(0.5-90).

2. A ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to claim 1, characterized in that: The weight ratio of dimethyltetrachloride sodium, tampoxone and benzylsulfuron-methyl is (0.2-50):(0.2-50):(2-50).

3. A ternary herbicidal composition containing dimethyltetrachloride sodium, tampronil and benzylsulfuron-methyl, characterized in that: The weight ratio of dimethyltetrachloride sodium, tampoxone and benzylsulfuron-methyl is 4:5:2 or 6:3:

2.

4. A ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to claim 1, characterized in that: The composition can be formulated into wettable powder, water dispersible granules and granules.

5. A ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to claim 4, characterized in that: For wettable powders, the adjuvants that can be used include dispersants, wetting agents and fillers.

6. A ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to claim 5, characterized in that: The dispersant includes one or more of polycarboxylates, lignin sulfonates, polyoxyethylene polyoxypropylene ether block copolymers, alkyl naphthalene formaldehyde condensate sulfonates, alkylphenol polyoxyethylene ether phosphates, fatty alcohol polyoxyethylene ether phosphates, alkylphenol polyoxyethylene ether sulfonates, etc.; the wetting agent includes one or more of alkyl sulfates, alkyl sulfonates, naphthalene sulfonates, etc.; the filler includes one or more of ammonium sulfate, urea, sucrose, glucose, diatomaceous earth, kaolin, white carbon black, light calcium, talc, attapulgite, clay, etc.

7. A ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to claim 4, characterized in that: For water dispersible granules, the adjuvants that can be used include dispersants, wetting agents, disintegrants, binders, and fillers.

8. A ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to claim 7, characterized in that: The dispersant includes one or more of polycarboxylates, lignin sulfonates, alkyl tea sulfonates, etc.; the wetting agent includes one or more of alkyl sulfates, alkyl sulfonates, naphthalene sulfonates, etc.; the disintegrant includes one or more of ammonium sulfate, sodium sulfate, polyvinyl pyrrolidone, starch and its derivatives, bentonite, etc.; the binder includes one or more of starch, glucose, polyvinyl alcohol, polyethylene glycol, sodium carboxymethyl cellulose, sucrose, etc.; the filler includes one or more of diatomaceous earth, kaolin, white carbon black, light calcium, talc, attapulgite, clay, etc.

9. A ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to claim 4, characterized in that: For granules, the adjuvants that can be used include carriers, dispersants, wetting agents and binders.

10. A ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to claim 9, characterized in that: The carrier includes one or more of clay, kaolin, talc, calcium carbonate, corn starch, aluminum silicate, etc.; the dispersant includes one or more of polycarboxylates, lignin sulfonates, alkyl naphthalene sulfonates, etc.; the wetting agent includes one or more of alkyl sulfates, alkyl sulfonates, naphthalene sulfonates, etc.; the binder includes one or more of polyvinyl alcohol, dextrin, polyvinyl pyrrolidone, etc.

11. Use of the ternary herbicidal composition containing dimethyltetrachloride, tampronil and benzylsulfuron-methyl according to any one of claims 1 to 10, characterized in that: Used to control annual grass weeds, broad-leaved weeds and sedge weeds in transplanted rice fields.

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