Herbicide composition including 2,4-D and dicamba in acid form formulated together as a microemulsion

Abstract

The present invention relates to a formulation comprising at least two auxinic hormonal herbicides (for example Dicamba and 2,4-D), normally used separately in applications to control a wide variety of broadleaf weeds, present in fields without cultivation (roads, fences and railways), during chemical fallows (period that elapses from the end of the harvest of one crop to the sowing of the next crop), and in crops such as winter cereals, corn and sorghum, that when applied together have a synergistic effect on weed control. This effect is even greater in the microemulsion formulation that includes at least the two active ingredients, if compared to the conventional tank mix, this greater efficiency being attributed to the chemical compatibility that exists in the "ready mix" achieved by the correct choice of emulsifiers to maintain active emulsion, physical compatibility that translates into greater biological efficacy. Therefore, it is an object of this invention to propose a herbicidal composition comprising at least (i) from 7.5% to 40% of 2,4-D in its acidic form and (ii) from 1.2% to 35% of Dicamba also in its acid formic as active ingredients, formulated together in a microemulsion type formulation. 2020273340 20 Nov 2020

Description

[0058] Graph No. 2 (Figure 2) shows the herbicide 2,4-D, a 30% microemulsion, which is the commercial chemical control of reference at the minimum and maximum recommended doses, and on the other hand, the formulation of the invention of the Example 2, also at the minimum and maximum doses likely to be recommended for this weed. As it can be seen, between the minimum and maximum dose of the commercial chemical control there is an increase in the percentage of control of Conyza spp. approximately 10% (from 28-30% of control to 37-41% of control depending on the state of the weed). But even applying the maximum dose, the control is not satisfactory, because it does not exceed 40% in the best of cases. When we visualize the minimum dose for this weed of 1 liter per hectare of the invention (which has the same amount of grams per liter of the active ingredient 2,4-D as the commercial chemical control, with the difference that the invention incorporates a proportion of Dicamba), the control efficacy is even higher than the maximum dose for this type of weed of 2,4-D, in microemulsion at 30%, for example, for Conyza less than 30 cm in height, from 40% to 60% of control (50 % greater efficiency), but when compared with the maximum dose of the invention for the considered weed (1.7 liters per hectare) with the maximum dose of 2.4-D 30% Microemulsion (1.7 liters per hectare), the difference is even greater, 2020273340 20 Nov 2020 since for the same growth stage of the weed, we go from 40% to 84% of the control (110% greater efficiency).

[0059] Graph No. 3 (Figure 3), compares the two doses of the invention (0.75 and 1.7 liters per hectare) with two doses of the formulation of 2,4-D choline salt 66.9% Soluble Concentrate (SL). An important clarification is that the latter has an acid equivalent of 2,4-D of 45.6%, which means that, in 1 liter of product formulated as soluble concentrate we have 456 grams of 2,4-D acid. As it can be seen in the graph, the dose of 1.5 liters per hectare of 2,4-D choline salt 66.9% SL and equivalent to 684 grams of active ingredient of 2,4-D acid achieves control percentages ranging from 50% for Conyza spp. of more than 30 cm in height, reaching 65% of control in Conyza less than 30 cm in height, almost equal values (the lines in the graph are superimposed) to the 0.75 liters per hectare of the invention. The most important point here is that, in the latter case, in the invention we have 240 grams of active ingredient of 2,4-D, that is, with 35.0% of active ingredient (formulation of Example 2), the same control efficacy was achieved (we have to clarify that the invention also comprises Dicamba in a certain proportion). When the comparison is made at the maximum doses used, the 2 liters per hectare of 2,4-D choline salt 66.9% SL (912 grams of 2,4-D acidic active ingredient) turn out to be slightly lower in control efficacy than the invention at the dose of 1.7 liters per hectare (510 grams of 2,4-D acidic active ingredient), that is to say that with 55.9% of the amount of 2,4-D active ingredient applied per hectare, the invention achieves between 2.5% (82% vs 84% of control in Conyza spp. less than 30 cm in height) and 12.7% (63% vs 71% of control in Conyza spp. of more than 30 cm in height) more effective control even 2020273340 20 Nov 2020 with approximately 50% of the amount of active ingredient applied per hectare.

[0060] Graph No. 4 (Figure 4) compares two doses of the invention (of 0.75 and 1.7 liters per hectare) with one dose (0.75 liters per hectare) of the formulation of 2,4-D 2-ethylhexyl ester 97% Emulsifiable Concentrate (EC). As shown in the graph, the dose of 0.75 liters per hectare of 2,4-D 2-ethylhexyl ester 97%, which is equivalent to 727.5 grams of active ingredient of 2,4-D acid, achieves control percentages ranging from 20% for Conyza spp. more than 30 cm in height, reaching 52% of control in Conyza less than 30 cm in height, values much lower than those achieved even by the minimum applied dose of the invention of 0.75 liters per hectare, which is equivalent to 225 grams of 2,4-D acidic active ingredient, where the control efficacy is 50% and 64%, respectively. Finally, when we compare the maximum applied dose of the invention of 1.7 liters per hectare that is equivalent to 510 grams of active ingredient of 2,4-D acid, we can see that it achieves a control efficacy much higher than the applied dose of 2,4-D 2-ethylhexyl ester 97% EC, reaching 71% of control values in Conyza spp. over 30 cm in height to 84% of control in Conyza spp. of less than 30 cm in height, that is to say that with 70% of the dose of active ingredient of 2,4-D acid of the applied of the 2,4-D 2-ethylhexyl ester 97% EC, the invention achieved 238% more of control in Conyza spp. more than 30 cm in height (71% vs 21% of control), and 59.6% more than control in Conyza spp. less than 30 cm in height (83% vs 52% of control). 2020273340 20 Nov 2020

[0061] The composition of the invention may be used in an amount of from 0.4 to 5.1 liters of the microemulsion formulation per hectare, depending on the type of weed and its resistance to herbicides.

Claims

1. A herbicidal composition comprising at least from 7.5% to 40% of 2,4-D in itsacidic form and from 1.2% to 35% of Dicamba also in its acidic form as active ingredients, both formulated together in microemulsion, from 18% to 37% of emulsifier, from 2.5 to 9.1% of co-solvent, from 1.65% to 8.5% of pH corrector, from 0.30 to 1.0% acidifier, 0.05% to 0.17% defoamer, 1.5% to 7.8% antifreeze agent, and 20% to 60% solvent, the percentages of which are expressed in weight per volume of the composition.

2. The composition of Claim 1, wherein the emulsifier is selected from a groupconsisting of coconut amide, cocoamide, propyl betaine, diphenylformamide.

3. The composition of Claim 1 or 2, wherein the co-solvent is selected from thegroup consisting of at least fatty acid methyl esters of vegetable origin, and fatty acid methyl esters of animal origin.

4. The composition of any one of Claims 1 to 2, wherein the anti-foam is selectedfrom the group consisting of at least silicone emulsions.

5. The composition of any one of Claims 1 to 4, wherein the antifreeze agent isselected from the group consisting of at least ethylene glycol, propylene glycol, and glycerin.

6. The composition of any one of Claims 1 to 5, wherein the pH corrector isselected from the group consisting of at least ethylmethylamine, diethylamine, and dimethylamine.

7. The composition of any one of Claims 1 to 6, wherein the acidifier is selectedfrom the group consisting of at least phosphoric acid, glacial acetic acid, and sulfuric acid.

8. The composition of any one of Claims 1 to 7, wherein the solvent is water.

9. The composition of any one of the preceding Claims, when used to control aweed, present in fields without cultivation (roads, fences and railways), during chemical fallows (period that elapses since the end of the harvest from one crop to sowing of the next crop), and in crops such as winter cereals, maize and sorghum.2020273340   24 Aug 202610. The composition of any one of claims 1 to 8, when used in the control of broadleaf weeds such as Sonchus oleraceus, Flaveria bidentis, Capsella bursa-pastoris, Datura ferox, Coronopus didymus, Amaranthus spp., Chenopodium album, Portulaca oleracea, Conyza spp., Bowlesia incana, Lamium amplexicaule, Xanthium cavanillesii, Glycine max, Trinthema portulacastrum, Poligonum aviculare, Anoda cristata, Cardus acanthoides, Brassica rapa, Raphanus sativum, Polygonum convolvulus, Carduus nutans, Silybum marianum, Anthemis cotula, Matricaria chamomilla, Ammi majus, Viola arvensis, Erodium cicutarium, Xanthium sp., Centaurea solstitialis, Stellaria media, Datura ferox, Rumex crispus, Physallis mendocina, Kochia scoparia, Salsola kali, Chenopodium pumulio, Diplotaxis tenuifolia, Brassica campestris, Raphanus sativus, Brassica nigra, Rapistrum rugosum, Raphanus raphanistrum, Sicyos polyacanthus, Commelina virginica, Wedelia glauca, Ambrosia tenuifolia, Sida rhombifolia, Verbena intermedia, Ipomoea sp., Bidens pilosa, Cyperus spp., Geoffroea decorticans, Acacia aroma, Cestrum parqui, Centaurea calcitrapa, C. solstitialis, C. melitensis, Erodium cicutarium, Silybum marianum; Cardus pycnocephalus, Salsola Kali, Taraxacum officinale, Plantago lanceolata, Brassica campestris B. napus, Hydrocotyle bonaeriensis, Carduus nutans, Camelina sativa, Carthamus lanatus, Cirsium vulgare, Xanthium spinosum, Verbecina encelioide, Medicago lupulina, Kochia scoparia, Cychorum intybus; Ambrosia tenuifolia, Ammi visnaga, Onopordon acanthium, Cynara cardunculus, Conium maculatum, Convolvulus arvensis, Tagetes minuta, Salpichroa origanifolia, Alternathera philoxeroides, Dichondra repens, Hypochoeris brasilensis, Baccharis coridifolia, Melilotus indicus, Lonicera sempervirens, Artemisa verlotorum.

11. A method for controlling a weed, present in fields withoutcultivation (roads, fences and railways), during chemical fallows (period that elapses since the end of the harvest from one crop to sowing of the next crop), and in crops such as winter cereals, maize and sorghum, comprising applying the composition of any one of Claims 1 to 11 to the weed.

12. The method according to Claim 11, wherein the weed is a broadleaf weed such as Sonchus oleraceus, Flaveria bidentis, Capsella bursa-pastoris, Datura ferox, Coronopus didymus, Amaranthus spp., Chenopodium album, Portulaca oleracea, Conyza spp., Bowlesia incana, Lamium amplexicaule, Xanthium cavanillesii, Glycine max, Trinthema portulacastrum, Poligonum aviculare, Anoda cristata, Cardus acanthoides, Brassica rapa, Raphanus sativum, Polygonum convolvulus, Carduus nutans, Silybum2020273340   24 Aug 2026marianum, Anthemis cotula, Matricaria chamomilla, Ammi majus, Viola arvensis, Erodium cicutarium, Xanthium sp., Centaurea solstitialis, Stellaria media, Datura ferox, Rumex crispus, Physallis mendocina, Kochia scoparia, Salsola kali, Chenopodium pumulio, Diplotaxis tenuifolia, Brassica campestris, Raphanus sativus, Brassica nigra, Rapistrum rugosum, Raphanus raphanistrum, Sicyos polyacanthus, Commelina virginica, Wedelia glauca, Ambrosia tenuifolia, Sida rhombifolia, Verbena intermedia, Ipomoea sp., Bidens pilosa, Cyperus spp., Geoffroea decorticans, Acacia aroma, Cestrum parqui, Centaurea calcitrapa, C. solstitialis, C. melitensis, Erodium cicutarium, Silybum marianum; Cardus pycnocephalus, Salsola Kali, Taraxacum officinale, Plantago lanceolata, Brassica campestris B. napus, Hydrocotyle bonaeriensis, Carduus nutans, Camelina sativa, Carthamus lanatus, Cirsium vulgare, Xanthium spinosum, Verbecina encelioide, Medicago lupulina, Kochia scoparia, Cychorum intybus; Ambrosia tenuifolia, Ammi visnaga, Onopordon acanthium, Cynara cardunculus, Conium maculatum, Convolvulus arvensis, Tagetes minuta, Salpichroa origanifolia, Alternathera philoxeroides, Dichondra repens, Hypochoeris brasilensis, Baccharis coridifolia, Melilotus indicus, Lonicera sempervirens, Artemisa verlotorum..

13. The composition when used according to claim 9 or 10 or method according to any one of Claims 11 and , wherein from 0.4 to 5.1 liters of the microemulsion formulation per hectare are used.3 LOMAS S.A.Patent Attorneys for the Applicant / Nominated Person SPRUSON & FERGUSON

Images