Herbicide Combinations Comprising Glufosinate and Oxadiazon

Abstract

The present invention relates to specific herbicide combinations comprising (i) L-glufosinate and/or salts thereof and (ii) oxadiazon 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) oxadiazon, wherein a ratio by weight of a total amount of component (i) is at least 10 times more than a total amount of component (ii) in case of (i) being glufosinate, and is at least 5 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 500:1 to 13:1 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 125:1 to 15:1 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 250:1 to 6:1 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 60:1 to 8:1 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, 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 0.2 to 50 g/L, in case of (i) being glufosinate, and in the range of from 0.4 to 100 g/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 0.2 to 50 g/L, in case of (i) being glufosinate, or the total amount of component (ii) is in the range of from 0.4 to 100 g/L, preferably in the range of from 2.5 to 60 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, and 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 wherein the composition in the form of a suspension concentrate (SC), oil dispersion (OD), or in form of microcapsules.

11. A method for producing 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 applying an 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 0.6 to 80 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 0.6 to 500 g/ha.

15. (canceled)

Description

EXAMPLES

[0240] The effect of herbicidal combination of the present invention, component (i), component (ii on the growth of undesirable plants compared to the herbicidally active compounds alone was demonstrated in a series of greenhouse experiments:

[0241] For post-emergence treatments, glufosinate and oxadiazon, which had been suspended in water, were applied using spray nozzles providing fine to coarse droplets.

[0242] The herbicide compounds applied in the examples were used as experimental or commercially available solo or premix formulations which have been diluted with tap water to a suitable concentration. Glufosinate was used as a commercial SL formulation containing 280 g ai/l of glufosinate (Liberty 280 SL, BASF). While the PPO herbicide Ronstar Flo containing 380 g ai/l oxadiazon was used (Ronstar Flo, Bayer) formulation.

[0243] The evaluation for plant injury or damage caused by the chemical compositions was carried out using a scale from 0-100% when compared with the untreated control plants. Here, 0 means no damage and 100 means complete destruction of the plants.

[0244] 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., E=X+Y−(X*Y/100), where

[0245] X=effect in percent using herbicide A at an application rate of a;

[0246] Y=effect in percent using herbicide B at an application rate of b;

[0247] E=expected effect (in %) of A+B at application rates a+b.

[0248] 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.

Example 1

Weed Control of Glufosinate Plus Oxadiazon Mixtures (Greenhouse)

[0249] Seedlings of Palmer amaranth (Amaranthus palmeri; AMAPA), common waterhemp (Amaranthuis tameriscinus; AMATA), barnyardgrass (Echinochloa crus-galli; ECHCG), and Italian ryegrass (Lolium multiflorum; LOLMU) were treated with postemergence applications of either glufosinate at 327 g ai/ha, oxadiazon at 0.8 g ai/ha, or the combination of glufosinate (327 g ai/ha) and oxadiazon (0.8 g ai/ha), respectively, when they were 5-10 cm in height. All glufosinate treatments contained 1% (w/v) ammonium sulfate and solo oxadiazon treatments contained 1% (v/v) MSO surfactant. Plants were placed in a completely randomized design with four replications per treatment. Percent injury data was collected 21 days after treatment (DAT). The results are summarized in table 1, table 2, table 3 and table 4.

TABLE-US-00001 TABLE 1 Demonstration of glufosinate potentiation through the addition of oxadiazon for the control of Amaranthus Palmerii (AMAPA). Solo Glufosinate Combined (0.8 + 327 g ai/ha) Oxadiazon (327 g Expected according Days after (0.8 g ai/ha) ai/ha) Observed to Colby Synergism treatment DAT % activity % activity % activity % activity Y/N 21 27 94 99 96 Y

TABLE-US-00002 TABLE 2 Demonstration of glufosinate potentiation through the addition of oxadiazon for the control of Amaranthus tamariscinus (AMATA). Solo Glufosinate Combined (0.8 + 327 g ai/ha) Oxadiazon (327 g Expected according Days after (0.8 g ai/ha) ai/ha) Observed to Colby Synergism treatment DAT % activity % activity % activity % activity Y/N 21 28 93 99 95 Y

TABLE-US-00003 TABLE 3 Demonstration of glufosinate potentiation through the addition of oxadiazon for the control of Echinochloa crus-galli (ECHCG). Solo Glufosinate Combined (0.8 + 327 g ai/ha) Oxadiazon (327 g Expected according Days after (0.8 g ai/ha) ai/ha) Observed to Colby Synergism treatment DAT % activity % activity % activity % activity Y/N 21 30 40 66 58 Y

TABLE-US-00004 TABLE 4 Demonstration of glufosinate potentiation through the addition of oxadiazon for the control of Lolium multiflorum (LOLMU). Solo Glufosinate Combined (0.8 + 327 g ai/ha) Oxadiazon (327 g Expected according Days after (0.8 g ai/ha) ai/ha) Observed to Colby Synergism treatment DAT % activity % activity % activity % activity Y/N 21 28 33 52 51 Y

[0250] As seen from the data in table 1, table 2, table 3 and table 4, the combination of glufosinate and oxadiazon provided enhanced control of AMAPA, AMATA, ECHCG and LOLMU compared to the individual components. For all four weed species, the observed control for the combination of glufosinate and oxadiazon was greater than the estimates of expected control based on the Colby equation, thus demonstrating the potentiating effect of the herbicide mixture.