Composition comprising a selective herbicide and an algal extract, use of an algal extract for detoxifying plants subjected to treatment with a selective herbicide

Abstract

The present invention relates to a composition comprising a selective herbicide, an algal extract and manganese and/or a silicate, to the use of an algal extract, optionally combined with manganese and/or a silicate, to detoxify plants subjected to a treatment by a selective herbicide and to a method for selective herbicide treatment of a crop comprising the simultaneous, combined or sequential application of a selective herbicide and an algal extract, optionally combined with manganese and/or a silicate.

Claims

1. A detoxifying composition comprising a selective herbicide, an algal extract, and either manganese, a silicate or a mixture of manganese and a silicate, wherein the composition comprises 20 to 80% of the selective herbicide, wherein the selective herbicide is glyphosate, dimethenamide-p or imazaquin; 5 to 50% of the algal extract, wherein the algal extract is from Ascophyllum nodosum; 2 to 20% of the manganese, silicate, or both, wherein the silicate comprises potassium silicate, and wherein the manganese comprises manganese EDTA; and 10 to 70% of an adjuvant and/or an additive selected from the group consisting of wetting agents, dispersants, emulsifiers, dyes, diluents, supports, and combinations thereof; wherein the percentages are percentages by weight of the total weight of the composition, and wherein the composition comprises no microbial strains.

2. The composition of claim 1, wherein the selective herbicide is glyphosate and having the following mass ratios: glyphosate/algal extract/silicate 90/5/5-50/25/25; glyphosate/algal extract/manganese 95/5/5-50/25/25; or glyphosate/algal extract/manganese/silicate 90/5/2.5/2-5-50/30/10/10.

3. A method of detoxifying a plant treated with a selective herbicide, comprising administering to the plant the composition of claim 1.

4. The method as claimed in claim 3, wherein that the plant is an agronomically useful plant or an ornamental plant.

5. The method of claim 3, wherein the plant is a glyphosate-resistant soybean treated with glyphosate.

6. A method of selective herbicide treatment of a crop comprising the simultaneous, combined or sequential application of a selective herbicide and an algal extract, combined with manganese and/or a silicate, and an adjuvant and/or an additive, wherein the silicate comprises potassium silicate; and the manganese comprises manganese EDTA, wherein the selective herbicide is glyphosate, dimethenamide-p, or imazaquin, wherein the algal extract is from Ascophyllum nodosum, wherein the adjuvant and/or additive is selected from the group consisting of wetting agents, dispersants, emulsifiers, dyes, diluents, supports, and combinations thereof, and wherein the method provides reduced phytotoxicity compared to a comparative treatment with no algal extract, wherein no microbial strains are applied.

7. The method of claim 6, wherein the crop is soybean.

8. The composition as claimed in claim 1, comprising: 5 to 40% of the algal extract; 2 to 20% of the manganese; and 2 to 20% of the silicate.

9. The composition as claimed in claim 8, comprising: 5 to 30% of the algal extract; 2 to 15% of the manganese; and 2 to 15% of the silicate.

10. The composition of claim 2, wherein the selective herbicide is glyphosate and having the following mass ratios: glyphosate/algal extract/silicate 80/10/10-40/20/40; glyphosate/algal extract/manganese 80/10/10-40/20/40; or glyphosate/algal extract/manganese/silicate 80/10/5/5-50/30/10/10.

11. The method of claim 3, wherein the composition is applied at a rate of 0.1 to 10 kg/ha.

12. The method of claim 3, wherein the selective herbicide is glyphosate and the following mass ratios are applied: glyphosate/algal extract/silicate 90/5/5-50/25/25; glyphosate/algal extract/manganese 95/5/5-50/25/25; or glyphosate/algal extract/manganese/silicate 90/5/2.5/2-5-50/30/10/10.

13. The method of claim 6, wherein the selective herbicide is glyphosate and the following mass ratios are applied: glyphosate/algal extract/silicate 90/5/5-50/25/25; glyphosate/algal extract/manganese 95/5/5-50/25/25; or glyphosate/algal extract/manganese/silicate 90/5/2.5/2-5-50/30/10/10.

14. A method of detoxifying a plant, comprising administering the composition of claim 1 to the plant at a rate of 0.1 to 10 kg/ha, wherein the composition provides reduced phytotoxicity compared to a comparative composition with no algal extract.

15. The method of claim 14, wherein the crop is soybean.

Description

EXAMPLES

(1) In the following examples, the algal extract used is an extract of Ascophyllum nodosum sold by Goëmar. This algal extract is denoted ALG.

(2) The following products, with the acronyms given between brackets, are also used: Glyphosate 360 (Gly) sold by Syngenta; Manganese-EDTA complex (Mn); Potassium silicate (Ksi); Dimethenamid-P (Out) sold under the trade name Outlook® by BASF; Imazaquin (Scep) sold under the trade name Scepter® by BASF.

Example 1

Treatment of a Glyphosate-Resistant Soybean

(3) Glyphosate-resistant soybean was planted in a greenhouse and left to grow until the 5-leaf stage. It was separated into different batches, which were each treated by spraying with the following different compositions:

(4) Glyphosate 360 (Gly), algal extract (ALG), manganese-EDTA (Mn) and potassium silicate (KSi), alone or in mixtures in the amounts given in the table below. A control batch was also cultivated, onto which water was sprayed.

(5) 4 weeks after treatment, the phytotoxicity of the treatments was assessed on the basis of the surface area of the leaves on which tissue necrosis was observed relative to the total surface area of the leaves (phytotoxicity) and on the basis of the percentage of plants having at least one necrosed leaf.

(6) TABLE-US-00001 Necrosed Plants having Sprayed surface a necrosed Batch composition area leaf no. Treatment (% w/v) (in %) (in %) 0 Untreated 100% water 0 0 control 1 Gly   1% 20 65 2 ALG 0.25%  0 0 3 ALG 0.5% 0 0 4 Mn 0.25%  0 0 5 Mn 0.5% 0 0 6 KSi 0.5% 0 0 7 KSi   1% 0 0 8 Gly + ALG  1% + 0.25% 15 36 9 Gly + ALG 1% + 0.5% 12 34 10 Gly + Mn  1% + 0.25% 18 55 11 Gly + Mn 1% + 0.5% 15 48 12 Gly + KSi 1% + 0.5% 15 40 13 Gly + KSi 1% + 1%   12 34 14 Gly + ALG +  .sup.  1% + 0.25% + 8 20 KSi 0.5% 15 Gly + ALG + .sup. 1% + 0.5% + 1 12 KSi 1% 16 Gly + ALG +  .sup.  1% + 0.25% + 5 15 Mn 0.25% 17 Gly + ALG + .sup. 1% + 0.5% + 1 10 Mn 0.5%

Example 2

Treatment of a Conventional Soybean with Scepter®

(7) Conventional soybean (that is to say not genetically modified and therefore not resistant to glyphosate) was planted in a greenhouse and left to grow until the 5-leaf stage. It was separated into different batches, which were each treated by spraying with the following different compositions:

(8) Scepter® (Scep), algal extract (GA142), manganese-EDTA (Mn) and potassium silicate (KSi), alone or in mixtures in the amounts given in the table below. A control batch was also cultivated, onto which water was sprayed.

(9) 4 weeks after treatment, the phytotoxicity of the treatments was assessed on the basis of the surface area of the leaves on which tissue necrosis was observed relative to the total surface area of the leaves (phytotoxicity) and on the basis of the percentage of plants having at least one necrosed leaf.

(10) TABLE-US-00002 Necrosed Plants having Sprayed surface a necrosed Batch composition area leaf no. Treatment (% w/v) (in %) (in %) 0 Untreated 100% water 0 0 control 1 Scep 0.1% 18 55 2 GA142 0.25%  0 0 3 GA142 0.5% 0 0 4 Mn 0.25%  0 0 5 Mn 0.5% 0 0 6 KSi 0.5% 0 0 7 KSi   1% 0 0 8 Scep + GA142  0.1% + 0.25% 12 44 9 Scep + GA142 0.1% + 0.5% 9 39 10 Scep + Mn  0.1% + 0.25% 18 49 11 Scep + Mn 0.1% + 0.5% 15 49 12 Scep + KSi 0.1% + 0.5% 15 41 13 Scep + KSi 0.1% + 1%   12 44 14 Scep + GA142 + 0.1% + 0.25% + 8 20 KSi 0.5% 15 Scep + GA142 + 0.1% + 0.5% + 2 15 KSi 1% 16 Scep + GA142 + 0.1% + 0.25% + 5 11 Mn 0.25% 17 Scep + GA142 + 0.1% + 0.5% + 1 10 Mn 0.5%

Example 3

Treatment of a Conventional Soybean with Outlook®

(11) Conventional soybean (that is to say not genetically modified and therefore not resistant to glyphosate) was planted in a greenhouse and left to grow until the 5-leaf stage. It was separated into different batches, which were each treated by spraying with the following different compositions:

(12) Outlook® (Out), algal extract (ALG), manganese-EDTA (Mn) and potassium silicate (KSi), alone or in mixtures in the amounts given in the table below. A control batch was also cultivated, onto which water was sprayed.

(13) 4 weeks after treatment, the phytotoxicity of the treatments was assessed on the basis of the surface area of the leaves on which tissue necrosis was observed relative to the total surface area of the leaves (phytotoxicity) and on the basis of the percentage of plants having at least one necrosed leaf.

(14) TABLE-US-00003 Necrosed Plants having Sprayed surface a necrosed Batch composition area leaf no. Treatment (% w/v) (in %) (in %) 0 Untreated 100% water 0 0 control 1 Out 0.5% 20 50 2 ALG 0.25%  0 0 3 ALG 0.5% 0 0 4 Mn 0.25%  0 0 5 Mn 0.5% 0 0 6 KSi 0.5% 0 0 7 KSi   1% 0 0 8 Out + ALG  0.5% + 0.25% 15 44 9 Out + ALG 0.5% + 0.5% 11 37 10 Out + Mn  0.5% + 0.25% 18 49 11 Out + Mn 0.5% + 0.5% 16 49 12 Out + KSi 0.5% + 0.5% 15 39 13 Out + KSi 0.5% + 1%   12 44 14 Out + ALG + 0.5% + 0.25% + 10 20 KSi 0.5% 15 Out + ALG + 0.5% + 0.5% + 8 20 KSi 1% 16 Out + ALG + 0.5% + 0.25% + 5 10 Mn 0.25% 17 Out + ALG + 0.5% + 0.5% + 1 8 Mn 0.5%

(15) As can be seen in the tables for examples 1 and 3 above, evidence of phytotoxicity is observed in batches 1 (treatment with selective herbicide). Batches 8 and 9, treated with a mixture of herbicide and algal extract, have less evidence of phytoxicity. Batches 14-17, treated with a mixture of herbicide/algal extract/manganese-EDTA or herbicide/algal extract/potassium silicate, have entirely reduced evidence of phytotoxicity.

(16) Thus, compositions of algal extract/manganese or algal extract/silicate notably reduce the phytotoxicity of the selective herbicide used in the treatment of the soybean.