CN109864068B - Weeding composition and application thereof - Google Patents

Abstract

The invention relates to a herbicide composition and an application method thereof, the composition is A, B two active ingredients, wherein, the component A is selected from compounds shown in the following general formula:

Description

Weeding composition and application thereof

Technical Field

The invention belongs to the field of agricultural herbicides, and relates to a weeding composition and application thereof.

Background

WO2016095768 reports isoxazoline-containing uracil compounds of the general formula I:

the compound of the general formula I has good herbicidal activity, can effectively control weeds of cockspur grass, green bristlegrass, cyperus heterophyllus, cyperus rotundus, crabgrass, hispid arthraxon, abutilon, zinnia, redroot amaranth, purslane, cocklebur, black nightshade, cassia tora, field watermelon seedlings, wild soybeans and other different leaf stages, and can obtain good herbicidal effect under low dosage.

The acetyl coenzyme A carboxylase (ACCase) inhibitor herbicide has excellent control effect on gramineous weeds, and the prior literature reports that the herbicides mainly have 4 types, namely aryloxyphenoxypropionic acid esters, oxime ether cyclohexanedione, aryloxyphenyl cyclohexanedione and triketone cyclohexanedione.

No report is found on the composition of the isoxazoline-containing uracil compound acting on weeds.

Disclosure of Invention

The invention aims to provide a weeding composition and application thereof.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the active component of the herbicide comprises a component A and a component B, wherein the component A is a compound shown as a structural formula I.

In formula I:

R₁is selected from methyl;

R₂、R₃can be the same or different and is respectively selected from hydrogen, fluorine or chlorine;

R₄selected from CO₂R₆；

R₅Selected from hydrogen, methyl, ethyl, tert-butyl or trifluoromethyl;

R₆selected from hydrogen, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl, trifluoroethyl, allyl, propargyl, methoxyethyl, ethoxyethyl, 2-tetrahydrofurylidene or 3-tetrahydrofurylidene.

The component B is selected from herbicides of acetyl coenzyme A carboxylase (ACCase) inhibitor class.

The weight ratio of the component A to the component B is 1: 80-80: 1.

Further optionally, component a, formula I:

R₁is selected from methyl;

R₂selected from fluorine;

R₃selected from chlorine;

R₄selected from CO₂R₆；

R₅Is selected from methyl;

R₆selected from hydrogen, methyl, ethyl, n-propyl, n-butyl, isopropyl, isobutyl, tert-butyl, trifluoroethyl, allyl, propargyl, methoxyethyl, ethoxyethyl, 2-tetrahydrofurylidene or 3-tetrahydrofurylidene.

Further optionally, the component B is selected from quizalofop-p-ethyl, haloxyfop-R-methyl, clodinafop-propargyl, metamifop or clethodim.

Further optionally, the weight ratio of the component A to the component B is 1: 40-40: 1.

Still further optionally, component a, formula I:

R₁is selected from methyl;

R₂selected from fluorine;

R₃selected from chlorine;

R₄selected from CO₂C₂H₅、CO₂C₃H₇Or CO₂C₄H₉；

R₅Is selected from methyl;

the components are quizalofop-p-ethyl, haloxyfop-R-methyl or clethodim;

the weight ratio of the component A to the component B is 1: 5-5: 1.

In the definitions of the compounds of the general formula I given above, the terms used are generally defined as follows:

halogen: refers to fluorine, chlorine, bromine or iodine. Alkyl groups: straight-chain or branched alkyl groups, such as methyl, ethyl, propyl, isopropyl, n-butyl or tert-butyl. Halogenated alkyl groups: straight-chain or branched alkyl groups in which the hydrogen atoms may be partially or completely substituted with halogen atoms, for example, chloromethyl, dichloromethyl, trichloromethyl, fluoromethyl, difluoromethyl, trifluoromethyl and the like.

Some of the compounds of formula I may be illustrated by the specific compounds listed in Table 1, but the invention is not limited to these compounds. Compounds in the tables R₁＝CH₃And the other groups are shown in table 1.

TABLE 1

Use of the herbicidal composition of claim 1 for controlling weeds.

The weeds are grassy weeds, broadleaf weeds, cyperaceae weeds, algae, ferns and woody shrubs.

The herbicide comprises the weeding composition as an effective weeding component, and the weeding composition accounts for 0.1-95 wt%.

The application of a herbicide for preparing a preparation for preventing and killing weeds.

The herbicidal compositions of the present invention are applied to the locus where undesirable vegetation is present or expected to be present, and may be applied selectively or non-selectively to the locus where undesirable vegetation is present or expected to be present. In particular, the fertilizer can be applied to soil in which the undesirable vegetation lives, stems and leaves of the undesirable vegetation, or burnout before the emergence of seedlings before planting or after sowing of crops, and post-emergence treatment of tolerant crops and non-tolerant crops.

The herbicide is applied to non-cultivated land, orchard, rubber garden, idle cultivated land, rubber garden, eucalyptus forest, fir forest, fire-proof road, lawn, railway, highway, airport and warehouse place.

The tolerant and non-tolerant crops are selected from rice, maize, legume crops, oilseed rape, vegetables, cotton, sugar beet, small grain crops, soybeans, peanuts, sugar cane, sunflowers, cultivated crops, woody plants. The orchard comprises an apple orchard, a peach orchard, a grape orchard, a pear orchard, a tea orchard, a mulberry orchard and a citrus orchard. The undesirable vegetation includes grasses, broadleaf weeds, sedges, algae, ferns, and woody shrubs.

The invention has the advantages that:

1. the two active ingredients in the weeding composition have very obvious synergistic effect, so that the dosage of each active ingredient is reduced;

2. the weeding composition of the invention has the advantages that the two active components are mixed for use, the weeding spectrum is expanded, the use amount and the use frequency are reduced, the resistance generation of resistant weeds is prevented, and the resistant weeds are prevented and removed.

3. The weeding composition disclosed by the invention has the characteristics of contact killing and systemic action by utilizing the complementation of different action mechanisms, so that the adaptability to adverse environments such as drought and low temperature in the field is improved, the reaction speed is accelerated, and the weeding is more thorough;

4. the weeding composition provided by the invention expands the application suitable period, and particularly enhances the continuous inhibition and prevention and removal effects on gramineous weeds with larger leaf ages; meanwhile, the herbicide has very high control effect on glyphosate-tolerant weeds such as erigeron breviscapus, cynodon dactylon, eleusine indica and the like;

5. the herbicide stem leaf spray treatment can be used for preventing and removing most weeds in places such as non-cultivated lands, orchards, idle cultivated lands, rubber gardens, eucalyptus forests, fire-proof roads, lawns, railways, highways, airports, warehouses and the like.

Detailed Description

The synergistic effect of the herbicidal composition of the present invention on grasses and broadleaf weeds is further illustrated by the following examples, but the present invention is by no means limited thereto, wherein the active components of the herbicidal composition of the present invention are component a, which is a compound of formula i, and component B, which is one of the acetyl-coa carboxylase (ACCase) inhibitor herbicides. The percentage of all the mixture ratios is weight percentage, and the active components are calculated by effective content.

Examples of measurement of biological Activity

Example 1 the active ingredient of the herbicidal composition of the present invention was used as component a and separately compounded with component B to measure the indoor combined action of weeds, component a exemplified by compounds a-3, a-4 and a-5 in the general formula I compound table 1, and component B exemplified by one of B1 quizalofop-p-ethyl, B2 haloxyfop-methyl and B3 clethodim.

The combined effect of the composition on weeds was confirmed by an indoor potting test.

The weed cultivation method comprises the following steps: sowing quantitative seed Abutilon Abutili and Setaria viridis respectively in paper cup with diameter of 7cm and containing nutrient soil, covering soil, pressing, spraying water, and culturing in greenhouse. Grassy weeds grow to 5-7 leaf stage, broad leaf weeds grow to 6-8 leaf stage, stem leaves are treated by spraying, and the experiment is repeated for 3 times. After the treatment, the liquid medicine is naturally dried, is managed in a greenhouse according to a conventional method, and visual control effect investigation is carried out 30 days after the treatment according to the condition that weeds are inhibited or killed (see tables 2 to 7).

The preparation method of the medicament comprises the following steps: all the test reagent samples are original medicines, and acetone is firstly used: dissolving dimethyl formyl (1: 2, V/V) mixed solvent, preparing mother liquor with a certain concentration by using 1 per thousand of Tween 80 water, and then preparing treatment solutions with different dosages according to a test scheme.

The combination effect of the proposed composition is evaluated by the Gowing method.

Theoretical value

In the formula:

x is the weed control effect when the dosage of the herbicide component A is P;

y represents the weed control effect when the dosage of the herbicide component B is Q;

E₀theoretical control when the amount of the herbicide component A is P + theoretical control when the amount of the herbicide component B is Q;

e, the actual measurement control effect of the herbicide component A and the herbicide component B after being mixed according to the proportion is obtained.

When E-E₀>When 10, the effect is synergistic; when E-E₀<At-10, antagonism is indicated; when E-E₀When the value is within. + -. 10, the addition is observed.

TABLE 2 Combined action of component A in combination with B1 on green bristlegrass

TABLE 3 Combined action of Components A and B2 on green bristlegrass

TABLE 4 Combined action of Components A and B3 on green bristlegrass

The test results (table 2, table 3, table 4) show that the component A-3 shows obvious addition or synergistic effect on the gramineous weed green bristlegrass when respectively mixed with the B1, the B2 and the B3.

TABLE 5 Combined action of Components A and B1 on Eleusine indica

TABLE 6 Combined action of Components A and B2 on Eleusine indica

TABLE 7 Combined action of Components A and B3 on Eleusine indica

The test results (table 5, table 6, table 7) show that the combination of component a-3 with B1, B2 and B3, respectively, shows significant additive or synergistic effect on the glyphosate resistant weed goosegrass.

Examples of the determination of herbicidal Activity in the field

Example 2 application of herbicides according to the invention to idle citrus orchard sites for the control of undesirable vegetation.

The test plots were in Meijiacun, a double-harbor street in Koroken, Anhui, Quzhou, City, and the plot was flat, and the soil type was paddy field soil. The field weeds comprise erigeron breviscapus, black nightshade herb, twotooth achyranthes root, endive, perfoliate knotweed herb, Chinese holly root, flaccid knotweed herb, crab grass, green bristlegrass herb, hispid arthraxonite herb, copperleaf herb, wintercherry herb, rubus parvifolius, hirsute hirsutus, Indian mockstrawberry herb, nutgrass flatsedge, windflower herb, sticktight, revolute vegetable, Chinese lobelia herb, meadowrue root and rose, and the like. Various weeds are disclosed in colonies. The main weeds are erigeron breviscapus, black nightshade, achyranthes bidentata, endive, perfoliate knotweed herb, pokeberry root, flaccid knotweed herb, large crabgrass, green bristlegrass herb, windflower herb and wintercherry herb, and most of the weeds are in the middle and later stages of vigorous growth.

Visual control of weeds by the herbicide composition was investigated 15 days after the treatment.

TABLE 8 control of citrus orchard weeds with herbicide formulation (% control 15 days after treatment)

Claims (5)

1. A herbicidal composition characterized by: the active component of the weeding composition consists of a component A and a component B, wherein the component A is a compound shown as a structural formula I; the component B is selected from quizalofop-p-ethyl, haloxyfop-R-methyl or clethodim;

the weight ratio of the component A to the component B is 1: 5-5: 1;

formula I

In formula I:

the component A is represented by the formula I:

R₁is selected from methyl;

R₂selected from fluorine;

R₃selected from chlorine;

R₄selected from CO₂C₂H₅、CO₂C₃H₇Or CO₂C₄H₉；

R₅Selected from methyl.

2. Use of a herbicidal composition according to claim 1, characterized in that: the application of the composition in weed control.

3. Use of a herbicidal composition according to claim 2, characterized in that: the weeds are grassy weeds, broadleaf weeds, cyperaceae weeds, algae, ferns and woody shrubs.

4. A herbicide characterized by: the weeding composition comprises the effective weeding component as claimed in claim 1, and the weeding composition accounts for 0.1-95% in weight percentage.

5. Use of a herbicide as claimed in claim 4, characterized in that: the herbicide is used for preparing a preparation for preventing and removing weeds.