Browse Prior Art Database

Herbicidal combination comprising saflufenacil and glyphosate

IP.com Disclosure Number: IPCOM000240510D
Publication Date: 2015-Feb-04

Publishing Venue

The IP.com Prior Art Database

Abstract

The present publication relates to a herbicidal combination comprising saflufenacil, glyphosate or one of its salts and at least one herbicide C different therefrom. The combination is particularly useful for preplant burndown.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 5% of the total text.

Page 01 of 59

0000076690

1

Herbicidal combination comprising saflufenacil and glyphosate

The present invention relates to a herbicidal combination comprising saflufenacil, glyphosate or one of its salts and at least one herbicide C different therefrom. The combination is particularly useful for preplant burndown.

5

Burndown, i.e. the complete removal of weeds from the soil by application of herbicides prior to planting or emergence of a crop, is an important tool of modern weed management. Weeds present at planting will generally grow much quicker than crop plants and thus compete very early in the growing season thereby damaging the crop

10

plants and reducing crop yield. Thus, it is desirable to plant the crop in a weed-free seed bed or to assure that essentially no weeds are present when the crop emerges.

Saflufenacil is the common name of the compound 2-chloro-5-[3,6-dihydro-3-methyl- 2,6-dioxo-4-(trifluoromethyl)-1-(2H)pyrimidinyl]-4-fluoro-N-[[methyl(1-methylethyl)-

15

amino]sulfonyl]benzamide which is a herbicidal active substance from the group of PPO inhibitors. Saflufenacil has been described in WO 01/083459. Further processes for its preparation are described in WO 03/097589, WO 05/054208, WO 06/097589, WO 06/125746 and WO 08/043835. Saflufenacil is particularly useful for preplant applications and selective preemergence weed control in multiple crops, including corn

20

and soybean.

Glyphosate and its salts are non-selective systemic herbicides having a good post- emergence activity against numerous grass weeds. So far, glyphosate is one of the most commonly used burndown herbicides. However, solo application of glyphosate

25

often yields unsatisfactory weed control, and several applications and/or high dosage rates are often required. Moreover, the effectiveness of glyphosate against difficult-to- control broadleaf species (hereinafter broadleaves) and rhizomatous grasses is poor. Therefore, it is frequently recommended to apply glyphosate in combination with at least one second herbicide, such as 2,4-D, dicamba, triazines such as atrazine or 30

metribuzin, chloroacetanilides such as metholachlor or dimethenamid (including dimethenamid-P), linuron and/or pendimethalin. However, the effectiveness of such combinations is often not satisfactory and high application rates are still required to achieve an acceptable control of a broad spectrum of weeds. Moreover, the reliability of such combinations depends strongly on the weathering conditions and certain

35

difficult to control weed species may escape. In addition, the herbicidal activity of these compositions persists only for a short time, which allows effective burndown only within a small timeframe prior to planting a crop. Moreover, the persistence of the herbicidal activity strongly depends upon the weathering conditions.

M/55027


Page 02 of 59

0000076690

2

It is known from WO 03/24221 and WO 2007/014759 that the activity of glyphosate against certain plants may be improved by c...