CN111387190A

CN111387190A - Weeding composition containing dicamba and bentazone

Info

Publication number: CN111387190A
Application number: CN202010389341.8A
Authority: CN
Inventors: 王敬壹; 孟威; 姜策; 李维根; 王岱峰; 张丹; 屈丽莉; 王宇颖; 韩锡连; 王岩
Original assignee: Liaoning Shanshui Yinong Technology Co ltd
Current assignee: Liaoning Shanshui Yinong Technology Co ltd
Priority date: 2020-05-10
Filing date: 2020-05-10
Publication date: 2020-07-10

Abstract

A weeding composition containing dicamba and bentazone belongs to the technical field of pesticides. The invention mainly aims to solve the problems that the existing compound herbicide generates drug resistance to weeds when being used for a long time, so that the control effect is reduced, and the like. The active ingredients of the weeding composition are dicamba and bentazone, the dicamba accounts for 1-60% of the weeding composition by mass, the bentazone accounts for 1-80% of the weeding composition by mass, and the balance is an auxiliary agent. The auxiliary agent is any one of dosage forms allowed in pesticides prepared from conventional surfactants, solvents, cosolvents, solid fillers or the like; preferably processed into missible oil, suspending agent, suspending emulsion, aqueous emulsion, microemulsion, oil suspending agent, dispersible oil suspending agent, soluble liquid, aqueous solution, water dispersible granule, dry suspending agent, granule or wettable powder, etc. The weeding composition reduces the resistance of weeds to the herbicide and improves the control effect of the resistant weeds by binary compounding, thereby prolonging the service life of the herbicide.

Description

Weeding composition containing dicamba and bentazone

Technical Field

The invention belongs to the technical field of pesticides, particularly relates to the field of herbicides of pesticide preparations, and particularly relates to a dicamba and bentazone binary compound weeding composition which can be applied to weeding in paddy fields.

Background

Dicamba, also known as dicamba; baicaodi. Chemical name: 3, 6-dichloro-2-methoxybenzoic acid, the structural formula of which is:

dicamba is a hormone herbicide. Has the effect of internal absorption and conduction and has obvious effect of preventing and killing annual and perennial broadleaf weeds. The dicamba spray can be quickly absorbed by the leaves, stems and roots of the weeds, then is conducted upwards and downwards through phloem and xylem, is mostly concentrated on meristems and parts with vigorous metabolic activity, and obstructs normal activity of phytohormones, so that the dicamba is dead.

Bentazone, also known as bentazone, chemical name: 3-isopropyl- (1H) -benzo-2, 1, 3-thiadiazine-4-ketone-2, 2-dioxide, the structural formula is:

bentazone is a heterocyclic contact-type and slightly systemic herbicide, and is treated in seedling stage and acts through contact of leaves. Can be transmitted into chlorophyll body of stem and leaf through penetration and absorption of leaf and root system, and can inhibit photosynthesis and water metabolism, so as to make physiological function of weed be disregulated and kill. Is mainly used for preventing and killing dicotyledonous weeds, cyperus esculentus in paddy fields and other monocotyledonous weeds, and is a good herbicide for paddy fields. Can also be used for weeding dry crops such as wheat, soybean, cotton, peanut and the like, such as Sparganium, Cyperus esculentus, monochoria vaginalis, bodhi felt, Scirpus planiculmis, water chestnut, cleavers, polygonum, amaranth, quinoa, Equisetum arvense and the like. The bentazone has the advantages of high efficiency, low toxicity, wide weed control spectrum, no phytotoxicity and the like. The rice is the crop with the largest planting area in China, but the varieties of weeds in the rice are various, the varieties of the common weeds are about 100, the weeds are characterized by multiple varieties (grassy, cyperaceae and broad-leaf weeds), large area, strong vitality and easy generation of drug resistance to a single herbicide. The rice loss rate of the rice in China every year caused by the weed danger is more than 15 percent. The most economical method for large-area weed control in paddy fields is closed weeding in paddy fields, so that a large amount of manpower, material resources and financial resources can be saved. The key to the successful closed weeding is to select the herbicide.

At present, the herbicide varieties in rice fields comprise single herbicides and compound herbicides, and the continuous use of the single herbicides can cause the drug resistance of weeds to cause the damage to be aggravated, so that the control effect is reduced, and even the phytotoxicity is caused.

Most of the existing compound herbicides are old formulations, and if the existing compound herbicides are used for a long time, weeds can generate drug resistance to the existing compound herbicides, so that the control effect is reduced. If the dosage is increased, the pesticide may cause unsafe phytotoxicity to rice. In addition, aiming at the weeds in the paddy field, the existing compound herbicide has fewer varieties and smaller selectivity.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a weeding composition containing dicamba and bentazone, which not only expands the weeding spectrum and obviously improves the weeding effect, but also avoids the possibility of generating phytotoxicity to current crops and residual toxicity to succeeding crops.

The above object is achieved by:

the weeding composition containing dicamba and bentazone is characterized in that the effective components of the weeding composition are dicamba and bentazone, the dicamba accounts for 1-60% of the weeding composition by mass, the bentazone accounts for 1-80% of the weeding composition by mass, and the balance is an auxiliary agent.

The auxiliary agent is any one formulation allowed on the pesticide prepared from conventional surfactants, solvents, cosolvents, solid fillers or the like allowed on the pesticide preparation; wherein the surfactant accounts for 1 to 20 percent of the weight of the weeding composition. Preferably processed into missible oil, suspending agent, suspending emulsion, aqueous emulsion, microemulsion, oil suspending agent, dispersible oil suspending agent, soluble liquid, aqueous solution, water dispersible granule, dry suspending agent, granule or wettable powder, etc.

The surfactant can be any one or a combination of two or more of alkyl sulfate, alkyl benzene sulfonate, fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene, nonylphenol polyoxyethylene, styrylphenol polyoxyethylene, castor oil polyoxyethylene, fatty alcohol-polyoxyethylene ether, polyol fatty acid ester, NNO (sodium methylene dinaphthalene sulfonate), sodium lignosulfonate and calcium lignosulfonate, and when the surfactant is two or more of the components, the adding proportion of each component is not limited.

The solvent can be one or more of water, xylene, toluene, aromatic solvent oil, ethylene glycol, polyethylene glycol (200-600) and polypropylene glycol (200-600), and when the solvent is two or more of the components, the adding proportion of each component is not limited.

The cosolvent can be any one or a combination of two or more of cyclohexanone, isophorone, acetone, diesel oil, butanediol, castor oil, pine oil, halogenated hydrocarbon, low molecular weight amides, methanol, dimethyl sulfoxide, polymethyl siloxane, tributyl phosphate, polyvinyl alcohol and triglyceride, and when the cosolvent is two or more of the components, the adding proportion of each component is not limited.

The solid filler can be any one or combination of two or more of sodium naphthalenesulfonate formaldehyde condensate, anionic naphthalenesulfonate, lignosulfonate, carboxymethyl cellulose, alkylbenzene sulfonate, fatty alcohol sulfonate, alkylphenol polyoxyethylene, polycarboxylic polyether, polyacrylic acid, ammonium sulfate, magnesium aluminum silicate, kaolin, diatomite and sepiolite, and when the solid filler is composed of two or more components, the adding proportion of each component is not limited.

The weeding composition can be applied to weeding in paddy fields, and particularly has a remarkable effect in preventing and killing gramineous, cyperaceous and broadleaf weeds in the paddy fields.

The weeding composition has the following advantages:

1. the weeding activity is high. The weeding composition can kill weeds through two different mechanisms, so that the resistance of the weeds is quickly reduced, and the weed control activity of the weeding composition is greatly improved.

2. Wide herbicidal spectrum and long acting period. The bentazone is a broad-spectrum herbicide, is mainly used for preventing and killing annual gramineous weeds such as barnyard grass, large crabgrass and moleplant seeds, and also can be used for treating part of annual broadleaf weeds and nutgrass flatsedge, and the dicamba is a herbicide for preventing and killing broadleaf weeds. After the two are mixed, the control of various gramineous weeds, cyperaceae weeds and broadleaf weeds can be improved.

3. Delaying weed resistance. The weeding composition disclosed by the invention reduces the resistance of weeds to the herbicide through binary compounding, and improves the control effect on resistant weeds, so that the service life of the herbicide is prolonged.

4. The safety is high. Because the dosage is controlled, the safety of the pesticide to rice and succeeding crops is improved on the premise of improving the pesticide effect.

The weeding composition disclosed by the invention is applied to weeding in a paddy field, can prevent and remove various gramineae, cyperaceae weeds and broadleaf weeds in the paddy field, and has safety on rice and succeeding crops on the premise of improving the pesticide effect. Therefore, the weeding composition can be applied to preparation of herbicides for weeding paddy fields, in particular to preparation of herbicides for preventing and killing gramineous weeds and broadleaf weeds in paddy fields.

Detailed Description

Example 1;

4% of dicamba, 12% of bentazone, 6% of alkylphenol polyoxyethylene, 3% of nonylphenol polyoxyethylene, 7% of ethylene glycol, 20% of aromatic solvent oil, and adding water to 100% to prepare 16% of aqueous emulsion according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 600-800 times and sprayed to apply the herbicide in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 2;

29 percent of dicamba, 2 percent of bentazone, 6 percent of sodium naphthalene sulfonate formaldehyde condensate, 3 percent of nonylphenol polyoxyethylene ether, 2 percent of tributyl phosphate, 7 percent of polyethylene glycol and 0.2 percent of polymethylsiloxane, adding water to 100 percent, and preparing the suspending agent with the mass percent of 31 percent according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 1200-1500 times and sprayed to apply in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 3;

49% of dicamba, 1% of bentazone, 8% of NNO (sodium methylene dinaphthalene sulfonate), 3% of polyvinyl alcohol, 7% of ammonium sulfate, adding kaolin to 100%, and preparing into granules with the mass percentage of 50% according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 2000-2500 times and sprayed to apply in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 4;

1% of dicamba, 9% of bentazone, 6% of a sodium methyl naphthalene sulfonate formaldehyde condensate, 9% of nonylphenol polyoxyethylene ether, 7% of ethylene glycol, 1% of magnesium aluminum silicate and 4% of triglyceride, adding water to 100%, and preparing the microemulsion with the mass percentage of 10% according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 80-150 times and sprayed to apply the herbicide in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 5;

39% of dicamba, 1% of bentazone, 4% of a sodium methyl naphthalene sulfonate formaldehyde condensate, 15% of phenethyl phenol polyoxyethylene ether, and adding aromatic solvent oil to 100%, and preparing the missible oil with the mass percentage of 40% according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 1500-1800 times and sprayed to apply in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 6;

10% of dicamba, 50% of bentazone, 6% of NNO (sodium methylene dinaphthalene sulfonate), 4% of sodium lignosulfonate and 100% of kaolin are added, and water dispersible granules with the mass percentage of 60% are prepared according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 400-600 times and sprayed to apply the herbicide in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 7;

5% of dicamba, 5% of bentazone, 6% of NNO (sodium methylene dinaphthalene sulfonate), 4% of calcium lignosulfonate, and kaolin added to 100%, and the wettable powder with the mass percentage of 10% is prepared according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 300-500 times and sprayed to apply the herbicide in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 8;

20% of dicamba, 31% of bentazone, 6% of a sodium methyl naphthalene sulfonate formaldehyde condensate, 4% of nonylphenol polyoxyethylene ether, 0.6% of magnesium aluminum silicate, 8% of polyethylene glycol, 4% of tributyl phosphate and 0.2% of polymethylsiloxane, adding aromatic solvent oil to 100%, and preparing the dispersible oil suspending agent with the mass percentage of 51% according to a conventional preparation method.

Example 9;

60% of dicamba, 4% of bentazone, 6% of NNO (sodium methylene dinaphthalene sulfonate), 4% of sodium lignosulfonate and kaolin added to 100%, and the dry suspending agent with the mass percentage of 64% is prepared according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 2500-3000 times and sprayed to apply the herbicide in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 10;

4% of dicamba, 80% of bentazone, 5% of NNO (sodium methylene dinaphthalene sulfonate), 3% of ammonium sulfate, 2% of polyvinyl alcohol, and adding kaolin to 100%, and preparing the water dispersible granules with the mass percentage of 84% according to a conventional preparation method.

The using method comprises the following steps: in the 2-4 leaf period of weeds, the preparation is diluted by 3000-3500 times and sprayed to apply the herbicide in the weather of avoiding strong wind, rainfall and cooling. When sprayed, the weed must be sufficiently covered and completely infiltrated by the foliage.

Example 11;

1) indoor activity assay test:

the co-toxicity coefficient of the preparation in the example 1-10 on common weeds in paddy fields, namely the monochoria vaginalis, is determined.

The test method comprises the following steps: respectively sowing quantitative seeds of the monochoria vaginalis in paper cups, sowing 12-16 seeds in each cup, culturing in a light incubator, and performing spray treatment on a crawler-type crop spray when the monochoria vaginalis is in a 2-4 leaf stage. The treated weeds are continuously cultured in a greenhouse, the weed control effect of the preparations in the examples 1-10 is regularly observed, the fresh weight of each treated weed is weighed after 30 days, and the toxicity regression curve and the co-toxicity coefficient of the weeds are calculated. The co-toxicity coefficient is more than 100, which shows that the two effective substances have synergistic action, and the co-toxicity coefficient is less than 100, which shows that the two effective substances have antagonistic action. The measurement results are shown in table 1.

Table 1 indoor activity assay results;

treatment agent	Regression line	ED50	Co-toxicity coefficient
				Example 1	Y=1.2547X+3.2541	13.54	123.05
Example 2	Y=1.3686X+3.3614	12.35	110.20
				Example 3	Y=2.0510X+2.9526	10.58	135.27
Example 4	Y=1.2697X+2.5211	12.05	132.21
				Example 5	Y=1.8562X+3.4853	10.95	121.01
Example 6	Y=1.5219X+3.2541	11.04	110.25
				Example 7	Y=1.3259X+5.1452	12.01	105.25
Example 8	Y=1.8341X+2.5244	16.25	125.25
				Example 9	Y=1.5547X+4.2562	11.68	112.35
Example 10	Y=1.5219X+3.2541	10.25	106.27

As can be seen from the table above, the co-toxicity coefficient of the two effective substances after being compounded is more than 100, which shows that the invention has obvious synergistic effect.

2) And field drug effect test.

Reagent to be tested:

the formulations of examples 1-10.

Control agents:

48% of dicamba aqueous solution (sold on the market) and 480 g/L (40% by mass) of bentazone aqueous solution (sold on the market).

Test work: rice (Oryza sativa L.) with improved resistance to stress

The rice seedlings grow well, the plants are robust, and no other plant diseases and insect pests exist.

Control target:

barnyard grass, large crabgrass, moleplant seed, green bristlegrass herb, arrowhead, allium fistulosum, water cabbage, monochoria japonica, monochoria vaginalis, Sparganium stoloniferum, cyperus heterophyllus, rhizoma alismatis, feltwort and other weeds.

The test method comprises the following steps:

various medicaments are accurately weighed according to the area of a test cell, diluted by water and uniformly sprayed by a knapsack sprayer, and a special fan-shaped sprayer for herbicides is selected as the sprayer. When spraying, the liquid medicine is required to be uniformly sprayed into a test cell, and the phenomena of missing spraying and excessive spraying are avoided.

After the test, weed death was observed 20 days and 40 days after the application, respectively, and herbicidal activities of the respective agents were compared. In addition, the production condition of the crops (the dosage is the dosage of the effective components per mu) is observed within 1-15 days after the pesticide is applied, so as to investigate whether the pesticide has phytotoxicity on the crops.

The herbicidal efficacy of the formulations of the examples of the present invention is shown in tables 2 (20 days after application) and 3 (40 days after application);

table 2 field efficacy test results (20 days post-drug);

table 3 field efficacy test results (40 days post-drug);

the amounts in tables 2 and 3 are the amounts of active ingredients in the formulations.

As can be seen from the above table, the herbicidal composition of the present invention has the effects of expanding the herbicidal spectrum, improving the herbicidal activity, and prolonging the duration of the herbicide.

Table 4 safety survey results of the agents on crops;

the rice in each field treatment has good growth vigor and no phytotoxicity, which indicates that various test agents are safe to the rice.

Claims

1. A weeding composition containing dicamba and bentazone is characterized in that: the active ingredients of the weeding composition are dicamba and bentazone, the dicamba accounts for 1-60% of the weeding composition by mass, the bentazone accounts for 1-80% of the weeding composition by mass, and the balance is an auxiliary agent.

2. The herbicidal composition comprising dicamba and bentazone according to claim 1, characterized in that: the auxiliary agent is any one formulation allowed in pesticides prepared from conventional surfactants, solvents, cosolvents, solid fillers and the like; can be processed into missible oil, suspending agent, suspending emulsion, emulsion in water, microemulsion, oil suspending agent, dispersible oil suspending agent, soluble liquid, aqueous solution, water dispersible granule, dry suspending agent, granule or wettable powder, etc.

3. The herbicidal composition comprising dicamba and bentazone according to claim 2, characterized in that: the surfactant can be any one or a combination of two or more of alkyl sulfate, alkyl benzene sulfonate, fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene, nonylphenol polyoxyethylene, styrylphenol polyoxyethylene, castor oil polyoxyethylene, fatty alcohol-polyoxyethylene ether, polyol fatty acid ester, NNO (sodium methylene dinaphthalene sulfonate), sodium lignosulfonate and calcium lignosulfonate, and when the surfactant is two or more of the components, the adding proportion of each component is not limited.

4. The herbicidal composition comprising dicamba and bentazone according to claim 2, characterized in that: the solvent can be one or more of water, xylene, toluene, aromatic solvent oil, ethylene glycol, polyethylene glycol and polypropylene glycol, and when the solvent is two or more of the components, the adding proportion of each component is not limited.

5. The herbicidal composition comprising dicamba and bentazone according to claim 2, characterized in that: the cosolvent can be any one or a combination of two or more of cyclohexanone, isophorone, acetone, diesel oil, butanediol, castor oil, pine oil, halogenated hydrocarbon, low molecular weight amides, methanol, dimethyl sulfoxide, polymethyl siloxane, tributyl phosphate, polyvinyl alcohol and triglyceride, and when the cosolvent is two or more of the components, the adding proportion of each component is not limited.

6. The herbicidal composition comprising dicamba and bentazone according to claim 2, characterized in that: the solid filler can be any one or combination of two or more of sodium naphthalenesulfonate formaldehyde condensate, anionic naphthalenesulfonate, lignosulfonate, carboxymethyl cellulose, alkylbenzene sulfonate, fatty alcohol sulfonate, alkylphenol polyoxyethylene, polycarboxylic polyether, polyacrylic acid, ammonium sulfate, magnesium aluminum silicate, kaolin, diatomite and sepiolite, and when the solid filler is composed of two or more components, the adding proportion of each component is not limited.