WO2003005821A1 - Procede de desherbage - Google Patents

Procede de desherbage Download PDF

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Publication number
WO2003005821A1
WO2003005821A1 PCT/GB2002/003154 GB0203154W WO03005821A1 WO 2003005821 A1 WO2003005821 A1 WO 2003005821A1 GB 0203154 W GB0203154 W GB 0203154W WO 03005821 A1 WO03005821 A1 WO 03005821A1
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WO
WIPO (PCT)
Prior art keywords
mesotrione
plants
weeds
triazine
tolerant
Prior art date
Application number
PCT/GB2002/003154
Other languages
English (en)
Inventor
Peter Bernard Sutton
Rex Alan Wichert
Original Assignee
Syngenta Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Syngenta Limited filed Critical Syngenta Limited
Publication of WO2003005821A1 publication Critical patent/WO2003005821A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N41/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a sulfur atom bound to a hetero atom
    • A01N41/02—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a sulfur atom bound to a hetero atom containing a sulfur-to-oxygen double bond
    • A01N41/10—Sulfones; Sulfoxides

Definitions

  • This invention relates to the use of mesotrione to control the growth of undesired target plants that show triazine tolerance.
  • Triazines are one known class of herbicides. In normal use, these have proved to be very effective across a wide range of weeds. However, an increasing problem encountered in agriculture is the appearance of weeds that have developed a tolerance to triazines. By 'tolerance' is meant that these weeds are less easily damaged or killed by the application of triazine than the normal phenotype. Typically, these weeds show little or no damage when triazines are applied at normal application rates. This tolerance arises naturally and occurs because of the selection pressure exerted on the weed population by repeated application of triazine herbicides. Some weeds have developed almost complete tolerance to triazines, that is, they are virtually undamaged by triazines at the normal commercial application rates. Sometimes the word 'resistant' is also used to describe such weeds, in particular where they have the inherited ability to survive treatment by a triazine.
  • Triazine tolerance is obviously a problem, because either the weeds thrive to an increasing degree, which can drive down crop yields, or alternatively increased quantities of triazine must be used, which increases cost and risks environmental damage.
  • mesotrione can be used to control triazine-tolerant weeds to a surprising degree.
  • Mesotrione is a known herbicide, and as such would be expected to kill weeds.
  • it is unexpectedly more effective against triazine-tolerant weeds than it is against ordinary weeds.
  • mesotrione to control triazine resistant weeds represents a surprising advance in the continuing efforts to control triazine-resistant weeds in agriculture and elsewhere.
  • a process of controlling triazine-tolerant weeds by the application of a herbicidal composition comprising mesotrione to the locus of said weeds.
  • the mesotrione can be in the form of a metal salt, for example a copper salt as disclosed in US 5 912 207.
  • the composition is applied at a rate such as to apply the mesotrione at above 50g/ha, more preferably above 75g/ha and most preferably above 105g/ha.
  • the composition is applied at a rate such as to apply the mesotrione at below 250g/ha, more preferably below 210g ha and most preferably below 180g ha. In glasshouse tests, much lower levels can be used. For example, in glasshouse tests, the mesotrione can be applied at as little as 0.1 to 10 g ha.
  • the process of the invention involves applying the composition by a convenient method to the locus of the tolerant weeds where control is desired.
  • the "locus" is intended to include soil, seeds, and seedlings, as well as established vegetation.
  • the process can be used in areas where there are no desired plants, such as crops, or where desired plants, such as crops, have been planted, but have not yet emerged Cpreemergence').
  • the process can also be used over a wide range of growing desired plants, such as crops (postemergence).
  • crops include (but not limited to) corn (maize), wheat and rice.
  • Suitable desired plants include those that are tolerant to mesotrione, particularly when the process is used postemergence, and/or tolerant to any other herbicide, such as glyphosate that can be additionally included in the composition.
  • the tolerance can be natural tolerance which is inherent or which is produced by selective breeding or can be artificially introduced by genetic modification of the desired plants. Tolerance means a low susceptibility to damage caused by a particular herbicide.
  • Plants can be modified or bred so as to be tolerant, for example to HPPD inhibitors like mesotrione, or EPSPS inhibitors like glyphosate.
  • Corn (maize) is inherently tolerant to mesotrione, and the process is particularly useful for controlling triazine tolerant weeds in corn. Examples of weeds with tolerant phenotypes include Redroot pigweed
  • AMARE AMARE
  • CHEAL common lambsquarters
  • SOLNI black nightshade
  • composition employed in the practice of the present invention can be applied in a variety of ways known to those skilled in the art, at various concentrations.
  • the composition is useful in controlling the growth of undesirable vegetation by preemergence or postemergence application to the locus where control is desired.
  • composition applied according to the present invention preferably also comprises an agriculturally acceptable carrier therefor.
  • the composition is applied as a formulation containing the various adjuvants and carriers known to or used in the industry for facilitating dispersion.
  • the choice of formulation and mode of application for any given compound may affect its activity, and selection will be made accordingly.
  • the compositions of the invention may thus be formulated as granules, as wettable powders, as emulsifiable concentrates, as powders or dusts, as flowables, as solutions, as suspensions or emulsions, or as controlled release forms such as microcapsules. These formulations may contain as little as about 0.5% to as much as about 95% or more by weight of active ingredient. The optimum amount for any given compound will depend upon formulation, application equipment, and nature of the plants to be controlled.
  • Wettable powders are in the form of finely divided particles that disperse readily in water or other liquid carriers.
  • the particles contain the active ingredient retained in a solid matrix.
  • Typical solid matrices include fuller's earth, kaolin clays, silicas and other readily wet organic or inorganic solids. Wettable powders normally contain about 5% to about 95% of the active ingredient plus a small amount of wetting, dispersing, or emulsifying agent.
  • Emulsifiable concentrates are homogeneous liquid compositions dispersible in water or other liquid, and may consist entirely of the active compound with a liquid or solid emulsifying agent, or may also contain a liquid carrier, such as xylene, heavy aromatic naphthas, isophorone and other non-volatile organic solvents. In use, these concentrates are dispersed in water or other liquid and normally applied as a spray to the area to be treated. The amount of active ingredient may range from about 0.5% to about
  • Granular formulations include both extrudates and relatively coarse particles, and are usually applied without dilution to the area in which suppression of vegetation is desired.
  • Typical carriers for granular formulations include sand, fuller's earth, attapulgite clay, bentonite clays, montmorillonite clay, vermiculite, perlite and other organic or inorganic materials which absorb or which can be coated with the active compound.
  • Granular formulations normally contain about 5% to about 25% active ingredients which may include surface-active agents such as heavy aromatic naphthas, kerosene and other petroleum fractions, or vegetable oils; and/or stickers such as dextrins, glue or synthetic resins.
  • Dusts are free-flowing admixtures of the active ingredient with finely divided solids such as talc, clays, flours and other organic and inorganic solids that act as dispersants and carriers.
  • Microcapsules are typically droplets or granules of the active material enclosed in an inert porous shell which allows escape of the enclosed material to the surroundings at controlled rates.
  • Encapsulated droplets are typically about 1 to 50 microns in diameter.
  • the enclosed liquid typically constitutes about 50 to 95% of the weight of the capsule, and may include solvent in addition to the active compound.
  • Encapsulated granules are generally porous granules with porous membranes sealing the granule pore openings, retaining the active species in liquid form inside the granule pores.
  • Granules typically range from 1 millimeter to 1 centimeter, preferably 1 to 2 millimeters in diameter. Granules are formed by extrusion, agglomeration or prilling, or are naturally occurring.
  • Shell or membrane materials include natural and synthetic rubbers, cellulosic materials, styrene-butadiene copolymers, polyacrylonitriles, polyacrylates, polyesters, polyamides, polyureas, polyurethanes and starch xanthates.
  • compositions for herbicidal applications include simple solutions of the active ingredient in a solvent in which it is completely soluble at the desired concentration, such as acetone, alkylated naphthalenes, xylene and other organic solvents.
  • Pressurized sprayers wherein the active ingredient is dispersed in finely- divided form as a result of vaporization of a low boiling dispersant solvent carrier, may also be used.
  • formulations include wetting, dispersing or emulsifying agents.
  • examples are alkyl and alkylaryl sulfonates and sulfates and their salts; polyhydric alcohols; polyethoxylated alcohols; esters and fatty amines.
  • These agents when used, normally comprise from 0.1% to 15% by weight of the formulation.
  • Each of the above formulations can be prepared as a package containing the herbicide together with other ingredients of the formulation (diluents, emulsifiers, surfactants, etc.).
  • the formulations can also be prepared by a tank mix method, in which the ingredients are obtained separately and combined at the grower site.
  • a commercial formulation of mesotrione is available as Callisto from Syngenta (formerly Zeneca Agrochemicals). Callisto is a suspension concentrate of mesotrione.
  • Dust and liquid compositions can be applied to the areas where control is desired by conventional methods.
  • Dust and liquid compositions can be applied by the use of power-dusters, broom and hand sprayers and spray dusters.
  • the formulations can also be applied from airplanes as a dust or a spray or by rope wick applications.
  • dust and liquid formulations can be distributed in the soil to a depth of at least one-half inch below the soil surface or applied to the soil surface only, by spraying or sprinkling.
  • the formulations can also be applied by addition to irrigation water. This permits penetration of the formulations into the soil together with the irrigation water.
  • Dust compositions, granular compositions or liquid formulations applied to the surface of the soil can be distributed below the surface of the soil by conventional means such as disking, dragging or mixing operations.
  • composition of the present invention may contain an antidotally effective amount of an antidote (also known as a 'safener') for mesotrione.
  • an antidote also known as a 'safener'
  • mesotrione mesotrione
  • compositions may contain, in addition to mesotrione, insecticides, fungicides, bactericides, acaracides or nematicides, in order to broaden the spectrum of activity.
  • results of individual tests can affect the results of individual tests and render them non-reproducible.
  • the results may vary depending on environmental factors, such as amount of sunlight and water, soil type, pH of the soil, temperature, and humidity, among other factors.
  • the depth of planting, the application rate of individual and combined herbicides, the application rate of any antidote, and the ratio of the individual herbicides to one another and/or to an antidote, as well as the nature of crops or weeds being tested can affect the results of the test.
  • Results may vary from crop to crop within the crop varieties.
  • T triazine tolerant
  • S triazine susceptible
  • the example target weeds were redroot pigweed (Amaranthus retroflexus L.; AMARE), common lambsquarters ⁇ Chenopodium album L.; CHEAL) and black nightshade (Solanum nigrum L.; SOLNI).
  • Each trial was a randomised complete block with treatments replicated four times.
  • the original source of triazine-resistant and non-resistant seed was Herbiseed.
  • Seeds for these tests came from plants grown from those seed lots.
  • the soil type in each case was a clay loam (loam:Nichol's clay; 2:1).
  • the soil was mixed with a full rate (128g of 12-12-12 per 10 gallons of soil) of fertilizer.
  • the mesotrione dosage was noted in grams of active ingredient (mesotrione) per hectare (g a.i/ha).
  • the dosages of mesotrione needed to control all types of weed under these ideal greenhouse conditions were much lower that one would normally use in the field. It should be noted that due to the rates used being very low, significant re-growth of the weeds (and hence reduction in the percentage of weed control) is possible.
  • the plants were grown and treated with mesotrione, on 23 April 2001, when the S plants were in the 6-7-leaf stage and 100 mm tall and the T plants were in the 7-leaf stage and 65-75 mm tall. Tap water containing 0.5% Tween 20 was used to prepare all spray solutions. The treatment solutions were applied at 200 1/ha and 40 psi using an 80015E nozzle. Rates of mesotrione (as Callisto 4SC from Syngenta) were 1, 2, 4, and 8 g a.i./ha. After spraying, the plants were placed in a glasshouse, under environmental conditions of 29/20°C (84/68°F day/night temperatures, 56/84% day/night relative humidity and a photoperiod of 14 hours.
  • Example 3 3.1 The seeding dates are shown in Table 3 A. These timings were based on earlier observations of differences in time-to-germination and growth rate. 3.2 Application
  • CHEAL and SOLNI plants were grown and treated with mesotrione (as Callisto 4SC from Syngenta) on 20 April 2001.
  • the stage of growth for each species and seed lot (biotype) was as shown in Table 3A.
  • the plants were grown and treated with mesotrione, on 24 April 2001, when the S plants were in the 6-leaf stage and 90-100 mm tall and the T plants were in the 6-leaf stage and
  • the plants were grown and treated with mesotrione, on 25 April 2001, when the S plants were in the 6-leaf stage and 45-55 mm tall and the T plants were in the 4-7-leaf stage and 25-40 mm tall.
  • Tap water containing 0.5% Tween 20 was used to prepare all spray solutions.
  • the treatment solutions were applied at 200 1/ha and 40 psi using an 80015E nozzle. Rates of mesotrione (as Callisto 4SC) were 1, 2, 3, and 8 g a.i./ha.
  • the plants were placed in glasshouse, under environmental conditions of 29/20°C (84/68 ⁇ day/night temperatures, 56/84% day/night relative humidity and a photoperiod of 14 hours.
  • Tap water containing 0.5% Tween 20 was used to prepare all spray solutions.
  • the treatment solutions were applied at 200 1/ha and 40 psi using an 80015E nozzle. Rates of mesotrione were 0.1, 0.3, 0.6 and 0.9 g a.i./ha.
  • the plants were placed in a glasshouse, under environmental conditions of 29/20°C (84/68* ⁇ day/night temperatures, 56/84% day/night relative humidity and a photoperiod of 14 hours.

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  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

L'invention concerne un nouveau procédé permettant de lutter contre les mauvaises herbes résistantes à la triazine par l'application sur le site de ces herbes d'une composition comprenant de la mésotrione.
PCT/GB2002/003154 2001-07-11 2002-07-08 Procede de desherbage WO2003005821A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0116955.6 2001-07-11
GB0116955A GB0116955D0 (en) 2001-07-11 2001-07-11 Weed control process

Publications (1)

Publication Number Publication Date
WO2003005821A1 true WO2003005821A1 (fr) 2003-01-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/003154 WO2003005821A1 (fr) 2001-07-11 2002-07-08 Procede de desherbage

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AR (1) AR034751A1 (fr)
GB (1) GB0116955D0 (fr)
WO (1) WO2003005821A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7355069B2 (en) 2002-06-20 2008-04-08 Astrazeneca Ab Ortho-substituted benzoic acid derivatives for the treatment of insulin resistance
WO2009044392A2 (fr) 2007-10-03 2009-04-09 Quark Pharmaceuticals, Inc. Nouvelles structures d'arnsi
EP2371958A1 (fr) 2006-10-25 2011-10-05 Quark Pharmaceuticals, Inc. Nouveaux ARNsi et procédés d'utilisation de ceux-ci
CN102265825A (zh) * 2011-06-14 2011-12-07 陕西韦尔奇作物保护有限公司 一种含甲基磺草酮的增效除草组合物

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0354047A2 (fr) * 1988-08-05 1990-02-07 May & Baker Limited Procédé herbicide utilisant l'atrazine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0354047A2 (fr) * 1988-08-05 1990-02-07 May & Baker Limited Procédé herbicide utilisant l'atrazine

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THE BCPC CONFERENCE: WEEDS, 2001, VOLUME 1 AND VOLUME 2. PROCEEDINGS OF AN INTERNATIONAL CONFERENCE HELD AT THE BRIGHTON HILTON METROPOLE HOTEL, BRIGHTON, UK, 12-15 NOVEMBER 2001, 2001, pages 621 - 624 *
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7355069B2 (en) 2002-06-20 2008-04-08 Astrazeneca Ab Ortho-substituted benzoic acid derivatives for the treatment of insulin resistance
EP2371958A1 (fr) 2006-10-25 2011-10-05 Quark Pharmaceuticals, Inc. Nouveaux ARNsi et procédés d'utilisation de ceux-ci
WO2009044392A2 (fr) 2007-10-03 2009-04-09 Quark Pharmaceuticals, Inc. Nouvelles structures d'arnsi
CN102265825A (zh) * 2011-06-14 2011-12-07 陕西韦尔奇作物保护有限公司 一种含甲基磺草酮的增效除草组合物

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AR034751A1 (es) 2004-03-17
GB0116955D0 (en) 2001-09-05

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