Herbicide combinations comprising glufosinate and oxyfluorfen

Abstract

The present invention relates to specific herbicide combinations comprising (i) L-glufosinate and/or salts thereof and (ii) oxyfluorfen in specific ratios, and to compositions comprising said herbicide combinations in these ratios. The present invention further relates to a method of producing said specific herbicide combinations and compositions comprising said specific herbicide combinations. The present invention also relates to the use of said specific herbicide combinations and compositions comprising said specific herbicide combinations in the field of agriculture, for controlling harmful plants or undesired plant growth, as well as to corresponding methods.

Claims

1. A herbicide combination comprising (i) glufosinate, L-glufosinate, or an agronomically acceptable salt thereof, and (ii) oxyfluorfen, wherein a ratio by weight of a total amount of component (i) is at least 1.5 times more than a total amount of component (ii) in case of (i) being glufosinate, and is at least 0.7 times more than the total amount of component (ii) in case of (i) being L-glufosinate.

2. The herbicide combination according to claim 1, wherein the ratio by weight of the total amount of component (i) to the total amount of component (ii) is at least from 35:1 to 2:1 in case of (i) being glufosinate.

3. The herbicide combination according to claim 2, wherein the ratio by weight of the total amount of component (i) to the total amount of component (ii) is at least from 15:1 to 2:1 in case of (i) being glufosinate.

4. The herbicide combination according to claim 1, wherein the ratio by weight of the total amount of component (i) to the total amount of component (ii) is at least from 15:1 to 0.8:1 in case of (i) being L-glufosinate.

5. The herbicide combination according to claim 4, wherein the ratio by weight of the total amount of component (i) to the total amount of component (ii) is at least from 8:1 to 1:1 in case of (i) being L-glufosinate.

6. A composition comprising the herbicide combination according to claim 1, wherein a total amount of component (i) is from 100 to 600 g/L, in each case based on the total amount of the composition.

7. The composition comprising the herbicide combination according to claim 6, wherein the total amount of component (ii) is in the range of from 3 to 400g/L, in case of (i) being glufosinate, and in the range of from 7 to 750g/L, in case of (i) being L-glufosinate, and in each case based on the total amount of the composition.

8. The composition comprising the herbicide combination according to claim 6, wherein the total amount of component (i) is in the range of from 100 to 600 g/L, and the total amount of component (ii) is in the range of from 3 to 400 g/L, in case of (i) being glufosinate, or the total amount of component (ii) is in the range of from 7 to 750 g/L, in case of (i) being L-glufosinate, and in each case based on the total amount of the composition.

9. The composition comprising the herbicide combination according to claim 6, wherein the composition additionally comprises one or more further components selected from the group consisting of formulation auxiliaries, additives customary in crop protection, and further agrochemically active compounds.

10. The composition according to claim 6, wherein the composition in the form of a suspension concentrate (SC), oil dispersion (OD), or in form of microcapsules.

11. A method for producing a herbicide combination as defined in claim 1, comprising (a) providing component (i), (b) providing component (ii), and (c) combining component (i) and component (ii), such that the herbicide combination is obtained.

12. A method for controlling undesired plant growth, and/or controlling harmful plants, comprising the step of applying a herbicide combination as defined in claim 1 onto the undesired plants or the harmful plants, on parts of the undesired plants or the harmful plants, or on the area where the undesired plants or the harmful plants grow.

13. The method for treating or protecting row crops from undesired plants or the harmful plants according to claim 12, wherein the total amount of component (i) is applied in the range of from 300 to 1000 g/ha, in case of (i) being glufosinate, or the total amount of component (i) is applied in the range of from 150 to 500 g/ha, in case of (i) being L-glufosinate, and the total amount of component (ii) is applied in the range of from 10 to 700 g/ha.

14. The method for treating or protecting specialty crops from undesired plants or the harmful plants according to claim 12, wherein the total amount of component (i) is applied in the range of from 300 to 6000 g/ha, in case of (i) being glufosinate, or the total amount of component (i) is applied in the range of from 150 to 3000 g/ha, in case of (i) being L-glufosinate, and the total amount of component (ii) is applied in the range of from 10 to 4000 g/ha.

15. (canceled)

Description

EXAMPLES

[0246] The effect of the herbicidal compositions according to the invention of herbicides A and B on the growth of undesirable plants compared to the herbicidally active compounds alone was further demonstrated by the following greenhouse experiments:

[0247] For the post-emergence treatment, the test plants were first grown to 3 to 4 inch (7.6 to 10.2 cm) tall, and only then treated. Here, the herbicidal compositions were suspended or emulsified in water as distribution medium and sprayed using finely distributing nozzles.

[0248] The herbicide compounds applied in the examples were used as commercially available formulations which have been diluted with deionized water to a suitable concentration.

[0249] Oxyfluorfen (commercial product name: Goal 2XL) was used as an emulsifiable concentrate having an active ingredient concentration of 240 g/l. Glufosinate (commercial product name: Liberty) was used as an aqueous soluble liquid of glufosinate ammonium having an active ingredient concentration of 280 g/l. Adjuvants of ammonium sulfate (AMS) and non-ionic surfactant (NIS) were added in all treatments. AMS and NIS were AMS Liquid and Induce at rates of 1680 g/ha and 0.25% (v/v), respectively.

[0250] The test period extended over 28 days after treatment (DAT). During this time, the plants were tended and their response to the individual treatments was evaluated.

[0251] The evaluation for the damage caused by the chemical compositions was carried out using a scale from 0 to 100%, compared to the untreated control plants. Here, 0 means no damage and 100 means complete destruction of the plants.

[0252] The plants used in the greenhouse experiments belonged to the following species:

TABLE-US-00001 Scientific Name Code Common Name Chenopodium album CHEAL Common lambsquarters Echinochloa crus-galli ECHCG Barnyardgrass

[0253] Colby's formula was applied to determine whether the composition showed synergistic action: S. R. Colby (1967) “Calculating synergistic and antagonistic responses of herbicide combinations”, Weeds 15, p. 22 ff.

E=X+Y−(X.Math.Y/100) [0254] where X=effect in percent using Oxyfluorfen at an application rate a; [0255] Y=effect in percent using glufosinate at application rate b; [0256] E=expected effect (in %) of Oxyfluorfen plus glufosinate at application rates a+b.

[0257] The value E corresponds to the effect (plant damage or injury) which is to be expected if the activity of the individual compounds is just additive. If the observed effect is higher than the value E calculated according to Colby, a synergistic effect is present.

[0258] The following table shows the herbicidal activity of the individual actives and of their combination on Chenopodium album.

TABLE-US-00002 Combined Solo (10.2 + 327 g ai/ha) Days Oxyfluorfen Glufosinate Expected after (10.2 g (327 g according Syner- treatment ai/ha) ai/ha) Observed to Colby gism DAT % activity % activity % activity % activity Y/N  7 33 81 93 87 Y 14 25 75 90 81 Y 21 30 78 90 85 Y

[0259] The following table shows the herbicidal activity of the individual actives and of their combination on Echinochloa crus-galli.

TABLE-US-00003 Combined Solo (10.2 + 327 g ai/ha) Days Oxyfluorfen Glufosinate Expected after (10.2 g (327 g Observed according Syner- treatment ai/ha) ai/ha) % to Colby gism DAT % activity % activity activity % activity Y/N  7 28 84 88 88 Additive 14 15 25 61 36 Y 21 20 20 49 36 Y