Herbicidal mixtures comprising l-glufosinate or its salt and at least one VLCFA inhibitor

Abstract

The present invention relates to herbicidal mixture comprising L-glufosinate or its salt and at least one VLCFA inhibitor. The invention furthermore relates to a method for controlling undesirable vegetation in burndown programs, in industrial vegetation management and forestry, in vegetable and perennial crops and in turf and lawn.

Claims

1. A herbicidal mixture comprising a) L-glufosinate and its salts as compound I; and b) pyroxasulfone as compound II; wherein L-glufosinate comprises more than 70% by weight of the L-enantiomer; and wherein the weight ratio of compound I to compound II is from 50:1 to 4:1.

2. The herbicidal mixture of claim 1, wherein compound I is selected from the group consisting of L-glufosinate-ammonium, L-glufosinate-sodium as L-glufosinate salts, and L-glufosinate as free acid.

3. The herbicidal mixture of claim 1, wherein compound I is L-glufosinate-ammonium.

4. The herbicidal mixture of claim 1, wherein L-glufosinate comprises more than 80% by weight of the L-enantiomer.

5. A pesticidal composition, comprising a liquid or solid carrier and the herbicidal mixture of claim 1.

6. A method for controlling undesirable vegetation, which method comprises applying the herbicidal mixture of claim 1 to a locus where undesirable vegetation is present or is expected to be present.

7. The method as claimed in claim 6, comprising application of the herbicidal mixture prior to emergence of the crop.

8. The method as claimed in claim 6, comprising application of the herbicidal mixture prior to planting the crop.

9. The method of claim 6, wherein the crop is selected from rice, maize, pulse crops, cotton, canola, small grain cereals, soybeans, peanut, sugarcane, sunflower, plantation crops, tree crops, nuts and grapes.

10. The method of claim 6, wherein the crop is selected from glufosinate tolerant crops.

11. The method of claim 6, wherein compounds I and II of the herbicidal mixture are applied simultaneously, that is jointly or separately, or in succession.

12. The herbicidal mixture of claim 11, wherein L-glufosinate comprises more than 90% by weight of the L-enantiomer.

13. The herbicidal mixture of claim 11, wherein L-glufosinate comprises 95% by weight of the L-enantiomer.

14. A herbicidal mixture comprising a) L-glufosinate and its salts as compound I; and b) pethoxamid as compound II; wherein L-glufosinate comprises more than 70% by weight of the L-enantiomer.

15. The herbicidal mixture of claim 14, wherein the weight ratio of compound I to compound II is from 100:1 to 1:10.

16. The herbicidal mixture of claim 14, wherein the weight ratio of compound I to compound II is from 50:1 to 1:5.

17. The method of claim 6, wherein the crop is soybeans.

18. A method for controlling undesirable vegetation, which method comprises applying the herbicidal mixture of claim 14 to a locus where undesirable vegetation is present or is expected to be present.

19. The method of claim 18, wherein the crop is selected from glufosinate tolerant crops.

20. The herbicidal mixture of claim 14, wherein the weight ratio of compound I to compound II is from 1000:1 to 1:500.

Description

EXAMPLE 1

Post Emergence Treatment with the Mixture of L-glufosinate with Pyroxasulfone

(1) TABLE-US-00004 Herbicidal activity against Application rate in g ai/ha ABUTH L-Glufosinate Pyroxasulfone Found Calculated 200 — 65 — — 50 70 — 200 50 100 90 200 — 65 — — 25 40 — 200 25 100 79

EXAMPLE 2

Post Emergence Treatment with the Mixture of L-glufosinate with Pethoxamid

(2) TABLE-US-00005 Herbicidal activity against Application rate in g ai/ha ABUTH AVEFA L-Glufosinate Pethoxamid Found Calculated Found Calculated 150 — 55 — 0 — — 100 0 — 0 — 150 100 98 55 40 0  75 — 0 — 0 — —  50 0 — 0 —  75  50 35  0 5 0