DD297762A5 - HERBICIDAL AGENT - Google Patents

Abstract

The invention relates to a synergistic combination of the known herbicides Buminafos * isoproturon (II) and bromoxynil (III) and their use as Nachauflaufherbizid. The mixing ratio of the active substances is within the limits of 25 to 80% * 15 to 55% (II) and 5 to 20% (III). {Pesticides; Herbicide; synergistic effect; agents; buminafos; isoproturon; bromoxynil}

Description

Field of application of the invention

The present invention relates to a novel combination of known herbicidal active ingredients and their use as post-emergence herbicides.

Characteristic of the known technical solutions

It is known that both 3- (4-isopropylphenyl) -1,1-dimethylurea (OE 2107774) and 3,5-dibromo-4-hydroxybonzonitrile (GB 1067031) are useful as a selective herbicide for weed control in cereals. A combination of the two active ingredients has proved to be advantageous in order to broaden the herbicidal activity spectrum (DE 2924403). It is also known that dibutyl I-butylaminocyclohexanephosphonate is suitable for inhibiting and influencing undesired plant growth and for selective weed control in crop plants (DD 33344), in which case advantageous effects can also be achieved by combination with known herbicides (DD 223624 et al.). A major disadvantage in agricultural practice in the application of the above-mentioned active ingredients or drug combinations is not always sufficient effect against certain hard-to-control Unkiäutarn such. Echinochloa crus-galli, Matricaria spec., Galium aparine.

Object of the invention

The aim of the invention is to enrich the state of the art by a new combination of herbicides with good performance characteristics.

Explanation of the essence of the invention

The object of the present invention is to find suitable combination partners for the herbicidal active ingredient Buminafos, which lead to a synergistically increased activity and enable the control of problem weeds.

Surprisingly, it has now been found that a mixture of i-butylaminocyclohexanephosphonic acid dibutyl ester (Buminafos) (I), 3- (4-isopropylphenyl) -1,1-dimethylurea (isoproturon) (II) and 3,5-dibromo-4- Hydroxybenzonitrile (bromoxynil) (III) unfolds in their herbicidal action in comparison to the individual components or combinations of two not only an additive, but a significantly synergistically increased activity.

As a result, a reduction of the amount of active ingredient is possible. In addition, for practical use, the unpredictable fact is of paramount importance that problem weeds such as Chenopodium album, Stellaria media, Matricaria spec, Galium aparine, Polygonum spec, Apera spica-venti and especially Echinochloa crus-galli, with the herbicide mixture according to the invention fight safely.

The mass ratio of the active ingredients may be in combination within the limits of 25 to 80% Buminafos (I), 15 to 55% isoproturon (II) and 5 to 20% Bromoxynil (III), preferably from 30 to 70% Buminafos (I) , 25 to 50% isoproturon (II) and 5 to 20% bromoxynil (III), in particular from 35 to 60% Buminafos (I), 30 to 45% isoproturon (II) and 10 to 20% Bromoxynil (III) move.

The composition according to the invention can advantageously be used post-emergence or during emergence of the Kuytu plants.

The combination of active ingredients has a good compatibility with crop plants and is particularly suitable for use in cereal, potato, fruit and maize cultivation, but without limiting the field of application.

If necessary, the agent of the invention can be applied as a total herbicide also on wasteland.

The herbicide combination can be converted into the usual formulations, such as emulsion concentrates, microemulsions, suspensions, powders, wettable powders, granules, etc. For this purpose, it is in a known manner with conventional extenders, such as liquid solvents and / or solid carriers, optionally with the use of surfactants,

dissolved or dispersed or varmahlen together or formulated by other known methods. The active ingredient content of the herbicide combination according to the invention is from 10 to 90% by mass, depending on the intended use. The application is in usual

Way, for example by pouring, spraying, spraying or spreading. The application rate of the composition may vary and depends on the nature of the desired effect,

the developmental stage of crops and weeds, as well as climatic conditions. In general, it is between 0.5 and 2 kg / ho.

The herbicidal composition can be used to extend the range of application and plant care with other known herbicides, fungicides, Insecticides, growth regulators and fertilizers are mixed and applied together. The following examples illustrate the advantageous properties of the combination and the good herbicidal activity. embodiments example 1

Composition of a 25% emulsion concentrate 12.5Ma .-% Buminafos {l) 8.5Ma .-% Isoproturon (II) 4.0Ma .-% Bromoxynil (III) 5.0Ma .-% Ca salt of dodecylbenzenesulfonic acid 5.0Ma % Adduct of 40 mole of ethylene oxide with 1 mole of castor oil 40.0% by weight of dimethylformamide 25.0% by weight of cyclohexanone

Example 2 Proof of the synergistic effect of the herbicide mixture (weed spectrum)

Nine plant species (weeds and crops) are grown in plastic cups in a row in a climatic room at 20 ° C with 12 hours of light and dark change. The substrate used is Industriekomposterde

NPK fertilizer supplement containing 70% peat and 30% sea mud. The application of the active substances or mixtures is carried out by Spray as 25 EC after emergence of the plants in the growth stage indicated below:

Stellaria media Galiumaparine Matricariaspec. Apera spica-venti Echinochloa crus-galli

6 to 8 leaf stage

3 whorled

4 leaf stage

3 to 4 leaf stage 3 leaf stadium

The% damage rating is made after a 14-day average, with mean percent weed eradication

is determined for each species.

Synergism (according to LIMPEL, L.E., et al., 1962, Proc. NEWCC 16, 48-53) can be carried out using the formulas

E = X + Y

100

or E = X + Y + Z-

(X x Y) + (X x Z) + (Y x Z) . XxYxZ

100

10000

in which E is the expected percentage inhibition of growth by a mixture of 2 or 3 herbicides at defined doses and X, Y and Z are the percentage growth inhibition by the herbicide I, II and III at defined doses. The determined results (E) and the theoretically calculated additive degree (th) of weed control for the combination of the components are shown in TaL j 1.

Table 1

dose Stellaria th Galium 3 th % Damage Apera th Echinochloa 8th • galli drug / g / ha media _ aparine 3 _ matrica spica- _ crus 15 mixtures - 5 - riaspec. venti - 5 th e - e 3 - e - e 40 _ 205 3 22 8th 6 E th 0 40 35 - Buminafos (l) 230 20 22 8th 8th 0 40 41 5 - Isoproturon (II) 80 2 5 50 8th 25 2 2 95 22 Bromoxynil (III) 205 + 230 3 24 11 4 35 41 19 I + Il 230 + 80 40 30 25 50 13 Il + III 205 + 80 15 30 28 5 26 I + III 205 + 230 + 80 90 30 4 95 I + Ii + III 100 28

The results tabulated clearly show that the tripartite combination acts synergistically since the observed weed kill of the tri-blend according to the invention is much stronger than the calculated additive value.

Example 3

Detection of the selective action and Kulturpfingenkompatibility of the herbicide mixture in corn and maize plastic pots (10cm diameter) are filled with substrate (Industriekomposterde as described in Example 2 ) and the corresponding crop species 1 to 2cm deep Sown in a suitable number for a uniform plant population. The cultivation takes place in the greenhouse. For each variant, 4 pots each are provided in an arbitrarily distributed block system.

The application and rating of the harmful effect is carried out according to Example 2.

The results are shown in Table 2.

Table 2

(II + dose rye winter winter %Damage winter Zea 5 th Apera Echinochloa • galli drug / (III) g / ha , .Lanoa ' wheat wheat Winter- barley mays 5 spica- crus mixtures (ID , Alcedo ' Regina ' barley , Rubina ' ¹ O - vent! th E th E th E th , Leuta * E th e - E th e E th 10 - buminafos 220 + 80 5 - 0 0 5 - 5 - 10 - bromoxynil 375 3 0 0 5 - 5 70 - 30 37 isoproturon 220 + 375 10 8 5 0 3 0 5 - 10 10 100 72 95 I + II + III + SO 10 10

E - detected damage

th - theoretically calculated additive degree of injury

The results show a remarkable synergism specifically against Echinochloa crus-galli, while the crops are practically not damaged more.

Example 4 Detection of selective herbicidal activity of the combination Buminafos, Isoproturon and Bromoxynil im Small parcellon trial in corn The experiments were carried out on a D3 site of Zea mays (variety, Bezamo ') at a weed coverage of 40 to 60%

5 m ² plots in randomized block with 4x repeats. The active substances or mixtures were applied as 25 EC with a Brüheaufwandmenge of 40 ml / m ² postemergence.

The assessment of the harmful effect is carried out according to Example 2. The results are shown in Table 3. Table 3

herbicide dose Cheno- 110 Stel 30 th Matri- 30 th poly- th Echino- Zea mays g / ha platform laria _ caria _ genum _ CLOA album media 40 spec. 30 con crus- 100 - 100 - vol - galli 58 51 vulus 52 E th e e C E th E th Buminafos (I) + 330 + 40 50 10 5 Bromoxynil (III) 110 Isoproturon (II) 375 30 5 30 5 I + II + III 330 + 100 58 95 90 37 10 10 375 +

E - detected damage

th - theoretically calculated additive degree of injury

The results show that the triple combination according to the invention has an unexpectedly high selective synergistic effect in the field.

Claims (3)

1. A herbicidal composition, characterized in that it comprises as active ingredients a mixture of i-butylaminocyclohexanephosphonic acid dibutyl ester (Buminafos), 3- (4-isopropylphenyl) -1,1-dimethylharnstoF (isoproturon) and 3,5-dibromo-4-hydroxybenzonitrile (Bromoxynil) in addition to conventional excipients and carriers. 2. A herbicidal composition according to item 1, characterized in that the mixing ratio of the active ingredients within the limits of 25 to 80% Buminafos, 15 to 55% isoproturon and 5 to 20% Bromoxynil, preferably from 30 to 70% Buminafos, 25 to 50% isoproturon and 5 to 20% Bromoxynil, in particular from 35 to 60% Buminafos, 30 to 45% isoproturon and 10 to 20% Bromoxynil. 3. Use of agents according to item 1, characterized in that they are used for controlling weeds in the wake-up process or during emergence of crops.