CN113331188A

CN113331188A - Weeding composition and application thereof

Info

Publication number: CN113331188A
Application number: CN202110461459.1A
Authority: CN
Inventors: 唐兴敏; 陈伟伟; 崔晓红; 贾成国
Original assignee: Hebei Veyong Bio Chemical Co ltd
Current assignee: Hebei Veyong Bio Chemical Co ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2021-09-03
Anticipated expiration: 2041-04-27
Also published as: CN113331188B

Abstract

The invention discloses a weeding composition and application thereof, belonging to the field of pesticide compositions, wherein the active ingredients of the weeding composition consist of propanil and topramezone; the weight ratio of the propanil to the topramezone is 1-20: 1-20; the weeding composition is used for preventing and removing weeds in paddy fields, and is particularly used for grassy weeds, broad leaves and sedge weeds.

Description

Weeding composition and application thereof

Technical Field

The invention relates to a weeding composition, belongs to the field of pesticide compositions, and particularly relates to a weeding composition for paddy field weeds and application thereof.

Background

At present, the weed control of paddy fields in China is mainly achieved by chemical means and assisted by measures such as artificial weeding or biological treatment. Therefore, how to screen the safe, efficient and long-lasting herbicide is very important for effectively preventing and removing weeds and ensuring the high and stable yield of direct-seeded rice.

Propanil is an amide herbicide, has various action mechanisms, not only destroys the photosynthesis of plants, but also inhibits respiration and oxidative phosphorylation, interferes nucleic acid and protein synthesis and the like. It is a high-selectivity contact-type herbicide, and is only suitable for being used as a stem leaf treating agent when propanil is ineffective after being decomposed in soil, and is mainly used for preventing and killing barnyard grass in paddy fields, and also can be used for preventing and killing young weeds such as crabgrass, green bristlegrass, wild amaranth and the like in herba monochoriae and dry paddy fields.

Topramezone is a benzoylpyrazopyr herbicide with the chemical name: [3- (4, 5-dihydro-1, 2-oxazol-3-yl) -4-formyl-0-tolyl ] (5-hydroxy-1-methylpyrazol-4-yl) methanone, which is absorbed by roots, seedlings and leaves after seedling stem and leaf treatment, conducts to apical and basal conduction in plants to meristems, indirectly affects the synthesis of carotenoids by inhibiting 4-hydroxyphenylpyruvate dioxygenase (4-HPPD) in plastoquinone biosynthesis, interferes with the synthesis and function of chloroplasts, and finally causes severe albinism (due to degradation of chlorophyll). The herbicide has wide herbicide controlling spectrum, can prevent and kill gramineous weeds and broadleaf weeds in a warm season, and has good effect and long lasting period.

The herbicide is used alone for a long time, so that the weeding spectrum is narrow, the biological activity is low, and the drug resistance of weeds can be caused; the compounding of the herbicides can solve the problems of high toxicity and poor effect of a single pesticide, and the interactive use of different pesticides can delay the generation of drug resistance of an agent, so that the herbicide has an ideal use effect, and the compounding of the pesticides with different action mechanisms is a research hotspot in the field of pesticides at present.

Disclosure of Invention

The invention aims to provide a herbicide composition which has reasonable components, low application cost and difficult drug resistance, has better control effect on grassy weeds, broadleaf weeds and nutgrass flatsedge, and has positive effects on the aspects of retarding the resistance of the weeds, reducing the dosage of the drugs and the like.

In order to achieve the purpose, the invention adopts the technical scheme that:

a herbicidal composition comprises active ingredients of propanil and topramezone; the mass ratio of the propanil to the topramezone is 1-20: 1-20.

The technical scheme of the invention is further improved as follows: the mass ratio of the propanil to the topramezone is 1-10: 1-10.

The technical scheme of the invention is further improved as follows: the mass ratio of the propanil to the topramezone is 1: 1.

The technical scheme of the invention is further improved as follows: the total mass percentage of the propanil and the topramezone in the composition is 5-50%.

The technical scheme of the invention is further improved as follows: the dosage form of the weeding composition is one of wettable powder, suspending agent, oil suspending agent, microemulsion, suspending emulsion and water dispersible granule.

The technical scheme of the invention is further improved as follows: the weeding composition further comprises an auxiliary agent, wherein the auxiliary agent comprises one or more of an emulsifier, a dispersing agent, a wetting agent, a binder, a disintegrating agent, a thickening agent, a stabilizing agent, an antifreezing agent and a defoaming agent filler.

The technical scheme of the invention is further improved as follows: the weeding composition is used for preventing and removing weeds in paddy fields, and is particularly used for grassy, broad-leaved and nutgrass flatsedge weeds, wherein the weeds comprise barnyard grass, monochoria vaginalis, monochoria japonica, cyperus heterophylla, ludwigia prostrata, moleplant, digitaria sanguinalis, green bristlegrass, goosegrass herb, chickweed, purslane, xanthium sibiricum, horseweed, nutgrass flatsedge, cyperus rotundus and the like.

Due to the adoption of the technical scheme, the invention has the following beneficial technical effects:

the composition can effectively reduce the generation of drug resistance of weeds and expand the weed control spectrum; can be used for preventing and treating gramineous weeds, broad leaves and sedge weeds. The weeding composition has obvious synergistic effect, can effectively reduce the application dosage of active ingredients after being compounded, reduces the environmental pollution, and is safe to crops. The weeding composition can induce and promote the growth of rice and plays a role in strengthening seedlings.

Detailed Description

The following detailed description of specific embodiments of the present invention is provided in conjunction with examples, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Example 1

2.5% propanil-2.5% topramezone suspending agent

2.5% of propanil, 2.5% of topramezone, 2% of sodium polycarboxylate, 2% of fatty acid polyoxyethylene ether, 5% of ethylene glycol, 0.3% of organic silicon defoamer, 0.2% of xanthan gum, 1% of magnesium aluminum silicate and the balance of deionized water to 100%.

According to the formula requirements, water is used as a medium, the effective components, a wetting agent, a dispersing agent, a thickening agent, a defoaming agent and the like are uniformly mixed, and the mixture is ground and/or sheared at a high speed to obtain the 2.5 percent propanil-2.5 percent topramezone suspending agent.

Example 2

2.4% propanil-47.6% topramezone water dispersible granule

2.4% of propanil, 47.6% of topramezone, 5% of sodium lignosulfonate, 2% of sodium dodecyl sulfate, 3% of white carbon black and the balance of corn starch to 100%.

According to the formula requirements, the active ingredients, the dispersing agent, the wetting agent, the disintegrating agent and the filler are uniformly mixed according to the formula proportion, the mixture is pulverized into wettable powder by airflow, and a certain amount of water is added for mixing, extruding and granulating. Drying and screening to obtain 2.4 percent propanil-47.6 percent topramezone water dispersible granules.

Example 3

Dispersible oil suspending agent containing 20% propanil and 1% topramezone

20% of propanil, 1% of topramezone, 4% of alkylphenol polyoxyethylene, 5% of polyoxyethylene polyoxypropylene block compound, 2% of organic bentonite and the balance of methyl oleate to 100%.

According to the formula requirements, methyl oleate is used as a medium, the effective components, a wetting agent, a dispersing agent, a thickening agent, a defoaming agent and the like are uniformly mixed, and the mixture is ground and/or sheared at a high speed to obtain the 20% propanil-1% topramezone dispersible oil suspending agent.

Example 4

3% propanil, 30% topramezone microemulsion

3% of propanil, 30% of topramezone, 8% of cyclohexanone, 10% of solvent oil, 2% of phenyl phenol polyoxyethylene ether phosphate, 3% of block polyether polymer, 4% of ethylene glycol and the balance of water to 100%.

According to the formula requirements, adding the active ingredients, the solvent, the cosolvent and the emulsifier together to dissolve into a uniform oil phase; adding the water-soluble substance into water, dissolving the water phase uniformly, and mixing the oil phase and the water phase uniformly under stirring to obtain the 3% propanil-30% topramezone microemulsion.

Example 5

Wettable powder of 40% propanil, 4% topramezone

40% of propanil, 4% of topramezone, 6% of sodium lignosulfonate, 4% of sodium dodecyl benzene sulfonate, 10% of white carbon black and 100% of kaolin.

According to the formula requirements, the raw pesticide, various auxiliary agents, fillers and the like are fully mixed and crushed by a jet mill until the fineness reaches a standard value, and the 40% propanil-4% topramezone wettable powder is obtained.

Comparative example 1

5% propanil suspending agent

5% of propanil, 2% of sodium polycarboxylate, 2% of fatty acid polyoxyethylene ether, 5% of ethylene glycol, 0.3% of organic silicon defoamer, 0.2% of xanthan gum, 1% of magnesium aluminum silicate and the balance of deionized water to 100%.

According to the formula requirements, water is used as a medium, the effective components, the wetting agent, the dispersing agent, the thickening agent, the defoaming agent and the like are uniformly mixed, and the 5% propanil suspending agent is obtained after grinding and/or high-speed shearing.

Comparative example 2

5% topramezone suspending agent

5% of topramezone, 2% of sodium polycarboxylate, 2% of fatty acid polyoxyethylene ether, 5% of ethylene glycol, 0.3% of organic silicon defoamer, 0.2% of xanthan gum, 1% of magnesium aluminum silicate and the balance of deionized water to 100%.

According to the formula requirements, water is used as a medium, the effective components, the wetting agent, the dispersing agent, the thickening agent, the defoaming agent and the like are uniformly mixed, and the 5% topramezone suspending agent is obtained after grinding and/or high-speed shearing.

Indoor bioassay test

Test agent solution: accurately weighing 95% of propanil and 95% of topramezone by a certain weight, dissolving with a proper amount of methanol, adding into clear water l containing 0.1% of Tween 80 emulsifier, and stirring uniformly to prepare a solution containing a certain effective component. Blank control solution: an equal amount of methanol was added to an equal amount of water containing 0.1% tween 80 emulsifier.

The test method is as follows: the activity of the cockspur grass in different compounding ratios is measured by adopting a weed pot bioassay method, and a blank control without pesticide application is set, and the process is repeated for 4 times. Culturing test material in a glass greenhouse, sowing barnyard grass seeds in plastic pots with the diameter of 10cm, sowing 30-40 seeds in each pot, covering soil with 1mm, placing in an enamel tray filled with water, transferring into the glass greenhouse for culturing after the water seeps into the soil surface, and planting and fixing 20 plants in each pot when 1-2 leaves of weeds are planted. Compounding the prepared original medicine solution, diluting into medicine liquid with certain concentration gradient, and uniformly spraying on stem and leaf of barnyard grass at 3-4 leaf stage with spraying pressure of 2kg/m²The flow rate of the conical spray head is 100 mL/min. Weed damage symptoms were recorded in detail after application. Weighing the fresh weight of the overground part of each treated weed 30 days after the application of the herbicide, and calculating the fresh weight control effect.

Fresh weight control (%) - (control fresh grass weight-treatment zone fresh grass weight)/control fresh grass weight × 100.

The evaluation of the effect of the combination of the mixtures was determined according to the Gowing method, which is formulated as:

Eo＝X+Y-XY/100

evaluation criteria: when E-Eo > 10%, indicating a synergistic effect; when the E-Eo is more than or equal to 10 percent and less than or equal to 10 percent, a synergistic and additive effect is shown; when E-Eo < -10%, it is expressed as a synergistic antagonism.

Wherein Eo is a theoretical value or an expected value of the control effect on the target weeds after the components A and B are mixed according to a certain proportion, X is the percentage control effect when the component A is used alone, Y is the percentage control effect when the component B is used alone, and E is an actual value or an observed value of the control effect on the target weeds after the components A and B are mixed according to a certain proportion.

TABLE 1 complexing propanil and topramezone for barnyard grass in-house combination

As can be seen from the table above, the compound weight ratio of the propanil to the topramezone is 1-20: 1-20, the propanil has a synergistic effect on the propanil, and the E-E0 is more than 10%; particularly, when the compounding weight ratio of the propanil to the topramezone is 1: 1, the synergistic effect of the composition is remarkable; when the compound weight ratio of the propanil to the topramezone is 1:30, the propanil and the topramezone have a synergistic antagonistic effect; the compound weight ratio of the propanil to the topramezone is 30: 1, has synergistic effect on barnyard grass.

Test of field drug effect

Test subjects: the field weeds mainly comprise barnyard grass, monochoria vaginalis, sedge, moleplant seed, oriental wormwood, abnormal sedge, clove knotweed and the like. The test method comprises the following steps: area of 25m per cell²Every 3 times of treatment, 5 medicaments in the example and 2 medicaments in the comparative example are randomly arranged in groups, and a knapsack electric sprayer is used for uniformly spraying stems and leaves, wherein the spraying dosage is 30L/667m². Spraying for 1 time, investigating fresh weight control effect after 30 days, comparing weeding activity of various agents, and observing growth condition of rice within 1-30 days after application to investigate whether the agents have phytotoxicity on the rice. Control effect (%) - (fresh weight of weeds in clear water control group-fresh weight of weeds in treated group)/fresh weight of weeds in clear water group]*100％。

TABLE 2 herbicidal composition field control of weeds in paddy fields

Test agent	Effective component (g.a.i/mu)	Control effect (%) 30 days after administration
			Example 1	30	93.6
Example 2	30	90.5
			Example 3	30	90.9
Example 4	30	91.6
			Example 5	30	92.2
Comparative example 1	30	72.8
			Comparative example 2	30	63.3
Clear water control	/	/

As can be seen from the table above, the compound application of propanil and topramezone can obviously improve the control effect on the weeds in the paddy field, has obvious synergistic effect, can effectively reduce the application dosage of pesticides, and reduces the environmental pollution.

TABLE 3 safety survey results of rice seedlings with the agents

The rice seedlings and the growth vigor in each treatment district are good, and no phytotoxicity symptom is seen, which indicates that various medicaments are safe to rice.

Indoor pot experiment for promoting rice growth

In the determination of the field weed control of the compound preparation of propanil and topramezone in paddy fields, the following results are found: compared with the plots treated by the compound preparation of propanil and topramezone, the plots treated by the compound preparation of propanil and topramezone and the comparison plots of clear water, the evaluation growth vigor of rice has obvious difference, so that the next step of experiment is carried out in order to verify that the compound of propanil and topramezone has the effect of inducing and promoting the growth of rice.

Sowing rice seeds into a seedling pot, transplanting when rice plants grow to a four-leaf period, transplanting into a pot with the size of 12 multiplied by 12cm, carrying out spraying treatment on 5 medicaments in the embodiment and 2 medicaments in the comparative example in a random grouping manner after planting for 1-2 days, wherein the effective component of the application amount is 100mg/L, spraying clear water as a control, repeating the treatment for 4 times, and measuring the stem length, the root length, the stem fresh weight, the root fresh weight, the stem dry weight and the root dry weight of the rice plants after spraying for 7 days.

TABLE 4 determination of promotion of growth of Rice plants

Test agent

Stem length (cm)

Fresh weight of stem (mg)

Stem Dry weight (mg)

Root length (cm)

Fresh weight of root (mg)

Root weight (mg)

Example 1

196.1±4.1

92.1±5.6

28.4±1.2

53.6±1.9

35.4±3.0

12.1±1.1

Example 2

194.2±3.6

93.0±4.2

29.6±1.2

52.5±2.5

33.5±3.8

11.6±1.6

Example 3

195.5±2.9

94.2±2.9

30.4±1.5

53.1±1.2

37.2±2.9

13.5±1.5

Example 4

196.7±3.7

92.5±4.0

30.8±1.0

54.7±2.1

37.8±3.0

13.2±1.2

Example 5

197.0±4.8

92.8±5.3

33.4±0.8

53.2±1.5

37.0±2.2

13.1±0.9

Comparative example 1

170.5±4.0

79.9±2.3

20.2±2.2

47.3±1.9

23.5±2.0

9.7±0.6

Comparative example 2

174.1±2.7

82.8±3.3

23.5±1.0

48.0±2.0

24.2±1.8

9.2±1.0

Clear water control

173.5±2.1

80.7±3.6

22.2±1.2

45.2±4.0

22.8±2.5

9.3±0.5

The stem length, root length, fresh stem weight, fresh root weight, dry stem weight and dry root weight of the rice treated by the propanil and topramezone compound medicament are all higher than those of the rice treated by the comparative example and the clear water control.

The above description is only a preferred embodiment of the present invention, and it is obvious to those skilled in the art that modifications may be made without departing from the scope of the present invention, and such modifications are also within the scope of the present invention.

Claims

1. A herbicidal composition characterized by: the active ingredients comprise propanil and topramezone, and the mass ratio of the propanil to the topramezone is 1-20: 1-20.

2. A herbicidal composition according to claim 1, characterized in that: the mass ratio of the propanil to the topramezone is 1-10: 1-10.

3. A herbicidal composition according to claim 2, characterized in that: the mass ratio of the propanil to the topramezone is 1: 1.

4. A herbicidal composition according to any one of claims 1 to 3, characterized in that: the total mass percentage of the propanil and the topramezone in the composition is 5-50%.

5. A herbicidal composition according to claim 1, characterized in that: the dosage form of the weeding composition is any one of wettable powder, suspending agent, oil suspending agent, microemulsion, suspending emulsion and water dispersible granules.

6. A herbicidal composition according to claim 1, characterized in that: the weeding composition also comprises an auxiliary agent, wherein the auxiliary agent comprises any one or more of an emulsifier, a dispersing agent, a wetting agent, a binder, a disintegrating agent, a thickening agent, a stabilizing agent, an antifreezing agent and a defoaming agent filler.

7. A herbicidal composition according to claim 1, characterized in that: the weeding composition is used for preventing and removing weeds in paddy fields.

8. A herbicidal composition according to claim 7, characterized in that: the weeding composition is used for grassy weeds, broad leaves and nutgrass flatsedge weeds.