CS268540B2 - Herbicide - Google Patents

Description

(57) A herbicidal composition comprising, as an active ingredient, the combination of N-phosphonoethyl glycine or a salt thereof and 2-nitro-5- (2-chloro-4-trifluoromethylphenoxy) -benzoic acid or a salt thereof, in a positional amount of from 12 t to 80: 1. The disclosed composition has a wide spectrum · effect and rapid onset of effect ·

CS 268 540 B2 1

SUMMARY OF THE INVENTION The present invention provides novel herbicidal compositions based on glyphosate herbicide and acifluorfen herbicide. The invention further provides a method of controlling unwanted plants using such compositions. Glyphosate (N-phosphonomethylglycine) and its salts are well known wide-spectrum herbicides effective against annual and perennial weeds * It is especially known that this class of herbioids is characterized by post-emergence activity and that it is used for both agricultural and horticultural applications further increase of herbicidal activity of these substances *

On the other hand, it is also known that glyphosate-type herbicides act relatively slowly * In order to exert their effects, generally a period of about 3 weeks is required *

To overcome this disadvantage, PCT patent application (WO 84/03 607) recommends that, for specific applications in private gardens, a certain amount of α-difluorophene β 2 -nitro-5- (2-chloro-4-trifluoromethylphenoxy) be added to glyphosate herbicides In this context, an effective amount of a glyphosate type herbicide to which oifluorophene is added in an amount such that the weight ratio of these substances practically ranges between 1: 1 is used. 8.33 and 4.2. However, it has been observed that, in many cases, the present compositions exhibit significant antagonism which adversely affects the efficacy of a glyphosate type herbicide. It has also been proposed to use various mixtures of glyphosate from acifluorphen to control weeds in field crops such as drawbar and not Thus, Prooeedings, Southern Weed Science Society, 33th Annual Meeting, Sanberg et al., 1935, pp. 86-89, reports that a dose of 430 g / ha glyphosate in combination with 70 g / ha acifluorphen exhibits marked antagonism against experimental weeds, which antagonism decreases as the ratio of glyphosate to acifluorfen decreases, i.e. when the amount of aoifluorfen increases.

Other publications (ibid., Pp. 64-67, Prost et al.) Also confirm that the dose of aoifluorfen needs to be increased.

The latter publication also shows that the spectrum of activity of glyphosate is reduced, particularly against grass plants.

A further disadvantage associated with the use of glyphosate or its derivatives lies in the fact that these substances wash off very easily, i.e. if large precipitation occurs within a few hours after their application, a large proportion of these active substances are washed off in the treated plants. It is also desirable to improve the efficiency of glyphosate-type herbioids on plants whose growth is slowed by low temperatures or low humidity or on plants already at the end of their development cycle.

Surprisingly, the present invention makes it possible to overcome these disadvantages and in particular to achieve one or more of the following objectives:

increase the rate of action of glyphosate, improve the spectrum of activity of glyphosate, improve the herbicidal properties of glyphosate, prevent glyphosate washout, and improve the efficiency of glyphosate on plants whose growth is slowed by low temperatures and / or low moisture or on plants that are already at the end of the development cycle.

Accordingly, the present invention provides a herbicidal composition comprising as active ingredient a combination of glyphosate or a salt thereof and acifluorphen or an eole thereof, wherein the weight ratio of these components is between 12 and 80: 1, preferably between 15: 1 and 50: 1.

Preferred glyphosate salts are eoli and organic amines, especially isopropylamine, which salt is the active ingredient in the herbicide supplied by Monsanto under

CS 268 540 B2

Accordingly, the invention provides a herbicidal composition comprising, as an active ingredient, a combination of glyphosate or its eoli and ecifluorfen or its eoli, wherein the weight ratio of these components ее is between 12 x 1 and 80: 1, and preferably between 15: 1 e.

X 1 ·

Preferred glyphosate salts are salts of organic amines, especially isopropylaine, which sol is the active ingredient in the herbicide supplied by Monsanto under the trade name Roundup.

Suitable salts of acifluorophane are, in particular, salts with alkali metals or with alkaline zeains.

In accordance with the invention, the novel agrochsical compositions described herein may contain mixtures of the active ingredients with conventional excipients known in the art, such as surfactants, carriers and diluents, so that the resultant composition can be mixed to hoaogenicity, which can be achieved using suitable mixing agents. The compositions according to the invention can be mixed up in a container or supplied in the form of a ready-made premix, which is a preferred alternative.

The invention also relates to a method for controlling weeds comprising applying an effective amount of a herbicidal composition according to the invention to lean plants. This method makes it possible to suppress the growth of weeds or to partially or completely destroy the weeds.

The herbicidal compositions or active compound mixtures according to the invention are applied to the leaves of plants and, in particular, to the weeds to be controlled, if, for example, the weeds still have green leaves, in any suitable manner.

The herbicidal compositions according to the invention can also be applied shortly before harvesting to kill weeds whose roots remain in the soil after harvesting. Thus, sowing or planting of other crop plants can be carried out shortly after harvesting without mechanical weeding (manually or otherwise). However, this method can only be applied where the herbicides applied do not leave harmful reeidis in the soil and / or are selective for the crop plant after sowing or planting after harvesting ·

Glyphosate or a salt thereof is generally applied to plants at rates of from 0.3 to 0.9 kg / ha, preferably from about 0.4 to 0.8 kg / ha, and in particular from about 0.5 to 0.7 kg / ha ·

Acifluorfen or its salts are used as cell membrane modifying chemicals and their doses are preferably between about 0.005 and 0.1 kg / ha, and in particular between 0.02 and 0.08 kg / ha ·

The weight ratio of acifluorphan or its salt to glyphosate or its salt is between 1 x 12 and 1 x 80, preferably between 1 x 15 and 1 x 50 · 0.

In the following text, the terms * glyphoeat 'and • acifluorphen always refer to the corresponding salts where appropriate and purpose.

By using the composition according to the invention, the following weeds can be effectively killed in dicotyledonous plants

Xanthiom

Ipomoea

Seebania

Abutilon / abutilon /

Polygons

Amarenthus

Chenopodium

Sinapis

CS 268 540 82

Datuгв / durman

Solenu * / aubergine / Euphorbia / spurge /

Bidens

Galinsoga / monsters / monocotyledons / grasses / Setaria / bér /

Echinochloa / hedgehog / ·

The method according to the invention allows to control a wide range of monocotyledonous and dicotyledonous perennial and perennial weeds. The weed can be controlled by using the methods of the invention, which allows keeping the cultivation area in good condition for subsequent crop cultivation such as cereals, wheat, rice, dresser, soybean, beet (especially sugar beet), sunflower, canola, sugar cane and vegetables, e effective weed control versus multi-year crops of useful plants / vines and fruit crops / ·

Since the herbicidal effect of the compositions according to the invention occurs shortly after treatment (much earlier than with the use of sanitary glyphosate even at higher doses), the compositions and methods of the invention allow the rapid eradication of undesirable plants, especially weeds.

The invention also prevents the washing of glyphosate from the treated surfaces. The invention also describes a method for preventing glyphosate dreaming by applying glyphosate in combination with acifluorophelium at the dosages and weight ratios defined above.

The herbicidal compositions according to the invention contain the active ingredients in combination with solid or liquid carriers suitable for use in agriculture and surfactants suitable for use in agriculture · Conventional carriers and customary surfactants may be used for this purpose.

The disclosed compositions may also include other cases such as protective colloids, adhesives, thickeners, thixotropic agents, penetration enhancers, activators, stabilizers, complexing agents and the like, as well as other known active ingredients having pesticidal properties (especially insecticides, fungicides or herbicides) or Plant Growth Regulators Generally speaking, the compositions of the invention may contain all the solid or liquid additives commonly used in the manufacture of similar compositions.

In the following text with percentages indicated, unless otherwise indicated, percentages are by weight ·

Activators are compounds that do not normally have herbicidal properties in the normal range (about 0.5 to 5 kg / ha) but have the ability to significantly increase the herbicidal activity of glyphosate-like compounds. described below, some of these activators are surface-active, such as in particular the polycondanation products of ethylene oxide with phenols, alcohols or amines. Some activators are ammonium salts, especially ammonium chloride, ammonium sulfate and inorganic or organic ammonium phosphates. other activators · Activators that normally increase the herbicidal activity of glyphosate type compounds may be used in the present invention even if phenoxynitrobenzoic acid derivatives are present · The amount of activators used in the compositions of the invention may be between about 0.1% and 500% % based on based on the amount of glyphosate, 8 preferably between about 50 and 350% · This percentage depends on the nature of the activator used ·

The doses of the compounds used in accordance with the invention may vary within wide limits, depending in particular on the nature of the plants to be controlled and / or on the degree of infestation of the weed crops.

In general, the compositions according to the invention contain about 0.05 to 95% of the active compounds according to the invention

· About 1 to 95% of one or more solid 61 liquid carriers and optionally about 0.1 to 50% of one or more surfactants;

The compositions described herein preferably contain 10 to 50% by weight of the combination of glyphosate and acifluorphen, preferably 15 to 30% of the co-coupling of the two active substances, as already mentioned above, combining the active substances according to the invention usually with carriers and optionally surfactants.

The term carrier * as used herein refers to an organic or inorganic, natural or synthetic material by which the active substance is combined to facilitate its application to rolatin, its seed or soil. This carrier is generally inert and must be suitable for use in agriculture in particular it must be acceptable for the plant to be treated · The carrier may be solid (clays, natural or synthetic silicates, diatomaceous earth, resins, waxes, solid fertilizers, etc.) or liquid (water, alcohols, especially butanol, esters, especially methylglycol acetate, ketones, in particular cyclohexanone and iaophorone, petroleum fractions, aromatic hydrocarbons, especially xylenes, or paraffinic hydrocarbons, aliphatic chlorinated hydrocarbons, especially trichloroethane, or aromatic chlorinated hydrocarbons, especially chlorobenzenes, water-soluble solvents such as dimethylformamide, dimethylsulfoxide and n-m-stearoxoxide; gases, etc. ·) ·

The surfactant may be an emulsifier, dispersant or ammonium ionogenic or nonionic surfactant, or a mixture of such surfactants. Deco examples include polyacrylic acid salts, lignosulfonic acid salts, phenolsulfonic or naphthalenesulfonic acid salts, polycondensation products of ethylene oxide with fatty alcohols, or amines fatty series, substituted phenols (especially alkylphenols or arylphenols), sulfosuccinic acid ester salts, taurine derivatives (especially alkyltaurates), phosphoric acid esters and condensation products of ethylene oxide with alcohols or phenols, fatty acid esters of polyhydric alcohols and derivatives of the aforementioned compounds containing Sulfate, Sulfonate and Phosphate Groups Generally, the composition of the invention comprises at least one surfactant.

The compositions of the present invention can generally be formulated into the formulations of the present invention. These formulations may be in various solid or liquid forms. Oako suitable formulations of the present invention may include, for example, water-soluble powders in which the active ingredient content may range up to 80%; water-soluble granules, in particular granules obtained by extrusion, compression, impregnation of a granular carrier or a powder preparation (active ingredient content of these granules and ranging from about 0.5 to 80% for the latter cases), and aqueous solutions ·

Water-soluble concentrates or solutions (especially powders or granules) most often contain from about 5 to 80% of active ingredients, while emulsions or solutions suitable for application generally contain from about 0.01 to 20% of active ingredients. solutions or concentrates may contain about 2 to 50% of suitable additives, such as stabilizers, surfactants, penetration enhancers, corrosion inhibitors, dyes or adhesives.

Emulsions of any desired concentration, which are particularly suitable for application to plants, can be prepared from these concentrates by dilution with water.

All of these aqueous dispersions, solutions or mixtures can be applied to weed crops in any suitable manner, for example by spraying, in doses ranging generally from about 100 to 1200 liters of spray mixture per hectare.

The compositions according to the invention are expediently applied to vegetation and in particular to the weeds to be controlled at a time when the weeds have green leaves.

The invention is illustrated by the following non-limiting examples.

CS 268 540 82

Example 1

Application of herbicidal agent after emergence of various plant species (greenhouse experiment) *

Dishes of 7 x 7 x 8 cm are not filled with light sandy soil »in which a certain number of seeds of the following test plants are always sewn» depending on the type of plant with the seed size ·

The seeds are covered with a layer of soil about 3 mm thick »they can be germinated and the plants are grown to a suitable stage * The treatment is carried out at the second leaf development stage in the case of grass plants» Ěst individual bowls with spray spray containing active substance in the desired concentration »with an application rate of 500 liters per hectare · The spray preparation is prepared by mixing water and an aqueous solution containing 240 g / liter of acifluorfen sodium (concentration in grams per liter)» as well as the reported grams per hectare refer to the acid form of acifluorfen) and an aqueous solution containing 360 g / liter of isopropylammonium salt of N-phosphonomethylglycine (the acid form of glyphoeat; concentration in grams per liter) as well as the grams per hectare reported concern the acid form) »which ro also contains 15% ethylene oxide polycondensate surfactant *

Various concentrated spray preparations are used »corresponding to different doses of active substances applied *

The treated trays are placed in tanks for the bottom irrigation of the trays and kept at 70% relative humidity for 24 days.

13 days after treatment (T + 13) and 29 days after treatment (T + 29), the number of live plants in the spray-treated pans containing the active substance or substances tested and the number of live plants in the control pans treated in the same way » containing no active substance * The results are expressed as a percentage * 100% means »that the plant species has been completely destroyed, О X means» the number of live plants in the treated dish is the same as the number of live plants in the control dish * □ as test plants in Example 1, use Ipomoea purpurea and Portulaca oleracea

The tests carried out show a remarkably rapid herbicidal effect of the compositions according to the invention in the post-emergence treatment.

The results obtained are shown in Tables I to III below.

weeds and treatment times dose of glyphosate g / ha Table no acifluorfen AND acifluorfenx Ipomoea 10 g / ha Portulaca T + 13 0 T + 29 0 T + 13 10 T + 29 10 Ipomoea 125 T + 13 0 0 //// //// //// T + 29 0 //// 0 //// //// Portulaca 125 T + 13 0 //// //// 80 //// T + 29 10 //// //// //// 80 Ipomoea 250 T + 13 0 20 May //// //// //// T + 29 0 //// 20 May //// //// Portulaca 250 T + 13 0 //// //// 98 //// T + 29 20 May //// //// //// 95

CS 268 540 B2

Table IX

weeds and treatment time dose of glyphoeat β / ha no acifluorfen acifluorphen: Ipomoea 20 g / ha Portulaca 13413 0 T * 29 0 1413 20 May T * 29 10 Ipomoea 125 T + 13 0 0 //// //// //// T + 29 0 //// 80 //// //// Portulaca 125 T + 13 0 //// //// 90 //// T + 29 10 //// //// //// 90 Ipomoea 250 T + 13 0 98 //// //// //// T-29 0 //// 80 //// //// Portulaca 250 т * 1з 0 //// //// 100 ALIGN! //// T * 29 20 May //// //// //// 100 ALIGN!

Table III

weeds e treatment time dose of glyphoet g / ha no acifluorfen acifluorphen: Ipomoea 40 g / ha Portulaca T + 13 40 T * 29 0 T + 13 20 May T + 29 ³⁰ Ipomoea 125 13 0 70 //// //// //// T <29 0 //// 60 //// //// Portulaca 125 T + 13 0 //// //// 100 ALIGN! //// T + 29 10 //// //// //// 95 Ipomoea 250 T + 13 0 100 ALIGN! //// //// //// T + 29 0 //// 100 ALIGN! //// //// Portulaca 250 T + 13 0 //// //// 100 ALIGN! //// T + 29 20 May //// //// //// 100 ALIGN!

Example 2

Field experiments

The plot is divided into 5-meter square parcels, and each plot is sewn into the rows 15 cm apart by the individual test plants listed below:

monocotyledon:

Avene fatua (deaf oats) (AVEFA)

Echinochloa crus-galli (ECHCG)

Lolium multiflorum (LOLMU)

Panicum milieceum (millet) (PANMI) dicotyledons:

Amarenthue retroflexus (Amare)

Sinepia red (mustard) (SINAR) □ when the test plants reach the stage of two to three leaves, ie »about 3 weeks after sowing, they are sprayed with mixtures of the active substances at appropriate concentrations to apply an appropriate dose of 500 liters each / ha · For comparative purposes e untreated control parcels are placed in the eousedet with each treated plot · Evaluation is performed at different time intervals after treatment and the results are expressed as percent of eradication of each tested plant species compared to the condition of the same plant on untreated parcele ·

CS 268 540 B2

In this particular example 15 hours after the treatment, 20 mm of water was rained · 5 days after the treatment, the herbicidal effect was determined · The same active ingredients as in the previous example were used in the test ·

The results obtained in the above test are given in Table IV below.

Table IV

active substance dose g / ha AVEFA ECHCG LOIMU PANMI AMARE SINAR acifluorphen sodium 50 9 ⁷ , 5 6.5 ⁷ ' ⁵ 25 22.5 salt mixture 200 * 5 * 27.5 35 37.5 37.5 60 40 glyphosate and 200 * 20 40 42.5 40 42.5 92.5 40 sodium salts 400 * 5 70 67.5 62.5 67.5 70 65 acifluorfen 400 * 20 70 70 62.5 72.5 85 72.5

SUBJECT OF THE INVENTION

Claims (2)

SUBJECT OF THE INVENTION A herbicidal composition comprising, as an active ingredient, a combination of N-phosphonomethylglycine or a salt thereof and 2-nitro-5- (2-chloro-4-trifluoromethylphenoxy) benzoic acid or a salt thereof, in a weight ratio of 12: 1 up to 80 i 1 · Composition according to claim 1, characterized in that it contains the abovementioned active substances in a weight ratio of from 15: 1 to 50% by weight.