NO128587B - - Google Patents

Description

Herbicidal preparations containing N1 -(3-chloro-4-methoxyphenyl)-N,N-dimethylurea and 2-chloro-4,6-bis(ethylamino)-s-triazine.

The present invention relates to herbicidal preparations containing N'-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea and 2-chloro-4,6-bis(ethylamino)-s-triazine.

The two compounds mentioned above are known as herbicides,

but the present preparation has unexpectedly advantageous properties in relation to the two active ingredients. It has thus been shown that the mixtures are synergistic. The dose of the difficult-to-produce compound N'-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea can be reduced, while achieving the same herbicidal effect, by replacing part of the compound with a smaller amount of the more readily available -like compound 2-chloro-4,6-bis(ethylamino)-s-triazine.

The present preparations can be prepared by mixing the constituent parts. Each of the two active ingredients should be present in amounts of from 1 - 100 parts. Parts, quantity ratios and percentages in what follows are per weight unless otherwise stated.

According to the invention, the herbicidal preparation contains the two compounds N'-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea and 2-chloro-4,6-bis(ethylamino)-s-triazine, in a ratio of 4 :1 to 24:1 per weight. Preferred quantity ratios between the compounds are respectively 8:1 to 24:1, e.g. 8:1 to 10:1 or 14:1 to 18:1, and very suitable ratios are 9:1 and 16:1.

The specified specific quantity ratios can be used in wettable powders which can contain up to 80% by weight of the active ingredients in total. The herbicidal preparations will normally contain a wetting agent and/or a carrier. The carrier can be a liquid, e.g. water, and the preparation can then advantageously contain a wetting agent. The water can be mixed with an organic solvent, but this is not essential. The carrier can be a liquid other than water, e.g. a water-miscible solvent, e.g. an aromatic or aliphatic hydrocarbon solvent, more particularly a hydrocarbon solvent boiling in the range from 130 - 250°C, in which the herbicides are dissolved or suspended. A wetting agent should preferably be added to the preparation so that it acts as a self-emulsifiable oil when added to water.

The carrier is preferably a solid substance, which can optionally be finely divided. Examples of suitable solids are clays, sand, mica and solid fertilisers.

Wettable powders which are soluble or dispersible in water are particularly preferred and these can be formed by mixing the herbicides with or without a carrier, with a wetting agent. A preferred wettable powder consists of the two stated herbicides, kaolin and/or silicon dioxide as carrier, and a wetting agent. Wettable powders according to the present invention will usually contain up to 80% active ingredients.

The term "wetting agent" is used in the broadest sense, so that it includes compounds and materials usually called emulsifying agents, dispersing agents and surfactants. Such agents are all well known in conjunction with herbicides.

Moisturizers that can be used include anionic compounds, e.g. soaps, fatty sulfate esters such as dodecyl sodium sulfate, octadecyl sodium sulfate and octyl sodium sulfate, fatty aromatic sulfonates such as alkyl benzene sulfonates or butyl naphthalene sulfonates, more complex fatty sulfonates such as the amide condensation product of oleic acid and N-methyltaurine or the sodium sulfonate of dioctyl succinate.

The humectants may also include non-ionic humectants, e.g. condensation products of fatty acids, fatty alcohols or fat-substituted phenols with ethylene oxide, or fatty esters and ethers of sugars or polyalcohols, or products produced from the latter type of compounds by condensation with ethylene oxide, or products known as block copolymers of ethylene oxide and propylene oxide. The humectants can also include cationic agents, e.g. octyl-tri-methylammonium bromide.

Preferred wetting agents include fatty alkyl sulfates, alkylaryl sulfonates, fatty alkyl ethoxylates, sulfated fatty alkyl ethoxylates, dialkyl sulfoauccinate esters, lignin sulfonate salts, sulfonated naphthalene formaldehyde condensates, and sulfonated urea formaldehyde condensates.

The active compounds can be mixed with other agricultural chemicals, e.g. with other herbicides or fertilizers.

The active compounds can usually be worked up into concentrated compositions containing from' 0.5 - 85% in total of N'-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea and 2-chloro-4,6-bis(ethylamino )-s-tria-zine. These concentrated compositions can then be diluted with water for use, usually so that the total concentration of the two herbicides varies from 0.05 to 4%.

Available herbicidal preparations can be used on plants, soil, land or water. They can be used as non-selective herbicides, especially to selectively control weeds in areas where you want to grow crops, e.g. wheat. They are particularly suitable for weed control in winter wheat. 2-Chloro-4,6-bis(ethyl-amino)-s-triazine alone has previously not been used to control weeds among winter wheat, as it damages the crop when used in such quantities that the weeds are eradicated.

The mixtures can be used as a pre-treatment agent, i.e. before or shortly after planting winter wheat in autumn. Preparations according to the present invention can also be used for post-treatment, e.g. on winter wheat in the spring. Normally, the preparations will be used in amounts from 1 to 9 kg, preferably from 1 to 5.5 kg, e.g. from 2 to 5.5 kg/hectare in total of the two active ingredients. - It is particularly advantageous and desirable to use less than 4 kg/hectare.

The active compounds can be mixed immediately before use. However, it is desirable that the compounds have already been mixed beforehand.

Present herbicidal preparations are active against a number of different broad-leaved weeds, e.g. water sedge (Stellaria media) and gooseberry (Anthemis spp.), in addition to many types of grass, such as foxtail (Alopecurus myosuroides).

The following examples illustrate the invention.

Example 1

Example 2

The preparation from Example 1 in water was sprayed as a finishing treatment on winter wheat in early spring in amounts of 3.4 kg/hectare of N'-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea and 0.21 kg/hectare of 2-chloro-4,6-bis(ethylamino)-s-triazine. After 35 days of growth, it was found that red fox rump had been controlled 99% compared to a control area.

Furthermore, no damage to the wheat plants could be detected. The control achieved with the herbicidal preparation was similar to that achieved on a similar area sprayed at the same time in a quantity of 4 kg/hectare of N1 -(3-chloro-4-methoxyphenyl)-N,N-dimethylurea.

Example 3

An experiment similar to that stated under example 2 above was carried out using the same preparation, but treating the area in autumn. The treated area was known to be relatively heavily infested with red fox rump. When the area was assessed together with a control area, and a similar area sprayed with N<1->(3-chloro-4-methoxyphenyl)-N,N-dimethylurea at a rate of 4.5 kg/hectare, an 80 to 90% control of field foxtail in both the plot treated with the mixture and with N'-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea without the wheat plants being damaged.

Example 4

Another preferred preparation is the following 80% wettable powder:

Example 5

The preparation from example 4 in water was sprayed as a finishing agent on winter wheat (2-5 leaf stage) in an amount of 2.0 kg/hectare N'-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea and 0 .20 kg/hectare of 2-chloro-4,6-bis(ethylamino)-s-triazine.

In an assessment for weed control, the following figures were found in a comparison with control areas:

No damage to the wheat plants could be observed. The control achieved with the herbicidal preparation corresponded to that achieved on a similar plot that was sprayed in a quantity of 4 kg/hectare with N',-(3-chloro-4-methoxyphenyl)-N,N- dimethyl urea.

Claims (1)

1. Herbicidal preparation, characterized in that it contains N'-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea and 2-chloro-4,6-bis(ethylamino)-s-triazine in a ratio of 4 :1 to 24:1 per weight.