GB2290966A - Herbicidal tralkoxydim based composition containing trifluralin or pendimethalin - Google Patents

Abstract

A herbicidal preparation comprising tralkoxydim <IMAGE> in combination with either trifluralin <IMAGE> or pendemethalin <IMAGE> produces a greater herbicidal effect against weed species than would be expected taking into account the activities of each of the compounds alone.

Description

HERBICIDAL COMPOSITION This invention relates to herbicidal preparations and compositions using a mixture of tralkoxydim and either trifluralin or pendimethalin which show synergistic or other activity enhancing effects.

Tralkoxydim is 2-[1-(ethoxyimino)propyl]-3-hydroxy-5-mesitylcyclohex- 2-enone.

Triflural in is atata-trifluoro-2,6-dinitro-N,N-dipropyl-a-toluidine.

Pendimethalin in N-(1-ethylpropyl)-2,6-dinitro-3,4-xylidine.

The applicants have found that the application of a mixture of tralkoxydim in combination with either trifluralin or pendimethalin produces a greater herbicidal effect against weed species than would be expected taking into account the activities of each of the compounds alone, and does not adversely affect the phytotoxicity towards the crop species.

According to the present invention there is provided a herbicidal preparation comprising tralkoxydim and either trifluralin or pendimethalin.

A preferred herbicidal preparation comprises tralkoxydim and pendimethalin.

The preparations of the invention have useful herbicidal activity.

They are capable of controlling the growth of a variety of plants including grass weed species in a wide range of situations such as agriculture and horticulture, forestry and amenity. In particular they are capable of controlling black-grass (Alopercurus myosuroides). They may suitably be used in cereal crops such as wheat and barley.

The compounds are preferably applied to the above ground parts of growing plants (post-emergence application).

In another aspect therefore, the invention provides a process of inhibiting the growth of unwanted plants, by applying to the plants, or to the locus thereof, tralkoxydim and either trifluralin or pendimethalin.

The rate of application required to inhibit the growth of unwanted plants will depend on, for example, the particular compounds chosen for use as well as the particular species of plants the composition is desired to control. However, as a general guide, an amount of from 0.5 to 5 kilograms preferably from 1.125 to 2.25 kilograms total active ingredient per hectare, is usually suitable. The ratio of tralkoxydim to trifluralin or pendimethalin applied is suitably in the range of from 1:40 to 4:1 preferably from 1:20 to 1:1.

The mixtures of tralkoxydim and either trifluralin or pendimethalin are suitably administered in the form of compositions.

Further according to the present invention there is provided a herbicidal composition comprising tralkoxydim, either trifluralin or pendimethalin and a solid or liquid diluent.

The ratio of tralkoxydim to trifluralin or pendimethalin in the composition is preferably in the range of from 1:40 to 4:1 and most preferably from 1:20 to 1:1.

The composition has been found to be particularly useful in post-emergence application to cereals.

Preferably the composition also comprises a surface active agent.

The compositions of the invention may be solid compositions in the form of dispersible powders or grains comprising in addition to the active ingredient, a wetting agent to facilitate the dispersion of the powder or grains in liquids. Such powders or grains may include fillers, suspending agents and the like.

Liquid compositions include solutions, dispersions and emulsions containing the active ingredient preferably in the presence of one or more surface active agents. Water or organic liquids may be used to prepare solutions, dispersions, or emulsions of the active ingredient. The liquid compositions of the invention may also contain one or more corrosion inhibitors for example lauryl isoquinolinium bromide.

Surface active agents may be of the cationic, anionic or non-ionic type. Suitable agents of the cationic type include for example quaternary ammonium compounds, for example cetyltrimethyl ammonium bromide. Suitable agents of the anionic type include for example soaps, salts of aliphatic mono-esters of sulphuric acid, for example sodium lauryl sulphate; and salts of sulphonated aromatic compounds, for example dodecylbenzenesulphonate, sodium, calcium and ammonium lignosulphonate, butylnaphthalene sulphonate, and a mixture of the sodium salts of diisopropyl- and triisopropyl-naphthalenesulphonic acid. Suitable agents of the non-ionic type include, for example, the condensation products of ethylene oxide with fatty alcohols such as oleyl alcohol and cetyl alcohol, or with alkyl phenols such as octyl-phenol, nonylphenol, and octylcresol.Other non-ionic agents are the partial esters derived from long chain fatty acids and hexitol anhydrides, for example sorbitol monolaurate; the condensation products of the said partial esters with ethylene oxide and the lecithins.

The compositions which are to be used in the form of aqueous solutions, dispersions or emulsions are generally supplied in the form of a concentrate containing a high proportion of the active ingredient, the concentrate being diluted with water before use. These concentrates are usually required to withstand storage for prolonged periods and after such storage to be capable of dilution with water in order to form aqueous preparations which remain homogeneous for a sufficient time to enable them to be applied by conventional spray equipment.

The compositions of the invention may contain, in addition to carriers and surface active agents, various other constituents to increase their usefulness. They may contain, for example, buffering salts to maintain the pH of the composition within a desired range; antifreeze agents, for example urea or propylene glycol; adjuvants, for example oils and humectants; and sequestrants, for example citric acid and ethylenediaminetetracetic acid, which help to prevent the formation of insoluble precipitates when the compositions are diluted with hard water.

Aqueous dispersions may contain anti-settling agents and anti-caking agents. The compositions may in general contain a dye or pigment to impart a characteristic colour. Agents for increasing viscosity may be added to reduce the formation of fine droplets during spraying, and thereby reduce spray drift. Other additives useful for particular purposes will be known to those skilled in the formulation art.

In general, concentrates may conveniently contain from 10 to 90% and preferably from 25 to 90% by weight of active ingredient. Dilute preparations ready for use may contain varying amounts of the active ingredient, depending upon the purpose for which they are to be used; however, dilute preparations suitable for many uses contain between 0.01% and 1% by weight of the active ingredient.

The preparation of the invention is preferably presented in a single composition. However they may be presented in a two pack-container, one compartment of which containing a composition comprising a tralkoxydim in combination with a solid or liquid diluent and the second compartment contains a composition comprising either trifluralin or pendimethalin in combination with a solid or liquid diluent.

The contents of the two compartments can then be admixed, for example by dissolving both in aqueous solution prior to administration.

The compositions of the invention may, in addition to tralkoxydim and trifluralin or pendimethalin, contain one or more compounds which possess biological activity for example herbicides, fungicides, insecticides (optionally with an insecticide synergist) and plant growth regulators.

The other herbicide will generally be a herbicide having a complementary action in the particular application.

Examples of useful complementary herbicides include: A. benzo-2,1,3-thiadiazin-4-one-2,2-dioxides such as bentazone; B. hormone herbicides, particularly the phenoxy alkanoic acids such as MCPA, MCPA-thioethyl, dichlorprop, 2,4,5-T, MCPB, 2,4-D, 2,4-DB, mecoprop, trichlopyr, fluroxypyr, clopyralid, and their derivatives (e.g. salts, esters and amides); C. arylurea herbicides such as diuron, flumeturon, metoxuron, neburon, isoproturon, chlorotoluron, chloroxuron, linuron, monolinuron, chl orbromuron, daimuron, methabenzthiazuron; D. triazine herbicides such as atrazine, simazine, aziprotryne, cyanazine, prometryn, dimethametryn, simetryne, and terbutryn;; E. thiocarbamate herbicides such as prosulfocarb, cycloate, vernolate, * * molinate, thiobencarb, butylate , EPTC , tri-allate, di-allate, esprocarb, tiocarbazil, pyridate, and dimepiperate; F. benzoic acid herbicides such as 2,3,6-TBA, dicamba and chloramben; G. dihalobenzonitrile herbicides such as dichlobenil, bromoxynil and ioxynil; H. diphenylether herbicides such as lactofen, fluroglycofen or salts or ester thereof, nitrofen, bifenox, aciflurofen and salts and esters thereof, oxyfluorfen, fomesafen, chlornitrofen and chl omethoxyfen; I. aryloxyphenoxypropionate herbicides such as diclofop and esters thereof such as the methyl ester, fluazifop and esters thereof, haloxyfop and esters thereof, quizalofop and esters thereof and fenoxaprop and esters thereof such as the ethyl ester;; J. cyclohexanedione herbicides such as alloxydim and salts thereof, sethoxydim, cycloxydim and clethodim; K. sulfonyl urea herbicides such as chlorsulfuron, sulfometuron, metsulfuron and esters thereof; bensulfuron and esters thereof such as DPX-M6313, chlorimuron and esters such as the ethyl ester thereof pirimisulfuron and esters such as the methyl ester thereof, 2-[3-(4-methoxy-6-methyl-1,3,5-triazin-zyl)-3-methylureido sulphonyl) benzoic acid esters such as the methyl ester thereof (DPX-L5300) and pyrazosulfuron; L. imidazolidinone herbicides such as imazaquin, imazamethabenz, imazapyr and isopropylammonium salts thereof, imazethapyr; M. arylanilide herbicides such as flamprop and esters thereof, benzoylprop-ethyl, diflufenican;; N. herbicidal amide derivative such as napropamide, propyzamide, carbetamide, tebutam, bromobutide, isoxaben, naproanilide and naptal am; 0. herbicidal triketones such as sulcotrione; P. miscellaneous herbicides including ethofumesate, cinmethylin, difenzoquat and salts thereof such as the methyl sulphate salt, clomazone, oxadiazon, bromofenoxim, barban, tridiphane, flurochloridone, quinclorac, dithiopyr and mefanacet; * These compounds are preferably employed in combination with a safener such as dichlormid.

The following example illustrates the invention.

EXAMPLE 1 Methods The compounds were tested as pre-formulated products and mixtures prepared as tank mixtures on winter wheat (Trials 1-2) and winter barley (Trials 3-4). Tralkoxydim was used as Grasp, an SC formulation containing 25% active ingredient. Stomp 400 (Trademark of American Cyanamid) is an EC formulation containing 40% pendimethalin. An oil/surfactant blend, Atplus 463 was added to all treatments at a concentration of 0.375% in the final spray volume.

Four replicates were used throughout and the phytotoxicity was assessed by counting surviving plants and expressed as % control relative to the untreated plots.

The results are given in Table I.

TABLE I % Black - grass control (counts) TRIAL 1 TRIAL 2 TRIAL 3 TRIAL 4 1/ha 117 174 125 126 DAA Grasp 0.8 80.8 37.2 81.6 74.7 Grasp 1.0 87.2 38.1 83.7 76.5 Grasp + Stomp 0.8+5.0 95.7 87.9 89.1 87.3 400 Grasp + Stomp 1.0+5.0 98.0 90.5 96.0 94.9 400 Stomp 400 5.0 5.2 55.0 12.6 0 Growth Stage 13-22 21-23 24-27 22-23 DAA = days after application

Claims (6)

1. CLAIMS 1. A herbicidal preparation comprising tralkoxydim in combination with either trifluralin or pendimethalin.
2. 2. A preparation according to claim 1 wherein the preparation comprises tralkoxydim in combination with pendimethalin.
3. 3. A herbicidal composition comprising tralkoxydim and either trifluralin or pendimethalin and a solid or liquid diluent.
4. 4. A composition according to claim 3 wherein the composition comprises tralkoxydim in combination with pendimethalin.
5. 5. A process for inhibiting the growth of unwanted plants, by applying to the plants, or to the locus thereof, tralkoxydim and either trifluralin or pendimethalin.
6. 6. A two pack-container having a first compartment containing a composition comprising tralkoxydim in combination with a solid or liquid diluent and a second compartment containing a composition comprising either trifluralin or pendimethalin in combination with a solid or liquid diluent.