KR20010023226A - Synergistic herbicidal combination - Google Patents

Abstract

The present invention relates to weed control, wherein the weed control method of the present invention comprises a herbicide composition containing about 500: 1 to 30: 1 weight ratio of molarate and oxyfluorfen in the presence of rice crops, weeds, or the like. It is sprayed on one distribution site.

Description

Herbicide mixture {SYNERGISTIC HERBICIDAL COMBINATION}

Molinate (S-ethyl haxahydro-1H-azepine-1-carbothionate) has been used for weed control of rice crops for many years. It is a barmate herbicide and is generally marketed as ORDRAM ™. Molinates of different formulations and strengths are sprayed before or after irrigation for the purpose of widespread control of weeds in rice crops, generally at a rate of about 500 to 11,000 g per hectare (ha). do. However, as with most pesticides, it would be desirable for the mollinate to be able to control weeds with low application rates. It may also have a lesser impact on the environment and / or workers handling such products.

The inventors have surprisingly found that mixing a low content of herbicide oxyfluorfen with molinate results in a synergistic effect resulting in similar weed control effects even when lowering the content of mololinate and / or its application rate. Found.

Oxyfluorophene, i.e. 2-chloro-1- (3-ethoxy-4-nitrophenoxy) -4- (trifluoromethylbenzene), is a diphenyl ether herbicide commercially sold under the trade name GOAL ™. Oxyfluorfen is commercially available for weed control of fruits, nuts, and vegetable crops, and cotton. It is not generally used for weed control of rice crops because the rate of application required for weed control causes unacceptable damage to rice crops. However, in China, oxyfluorfen is used for weed control of rice on a small scale. However, the use of oxyfluorophene in combination with mollinate in a content that is substantially nontoxic to rice crops, in particular below the standard usage or spraying ratio, in accordance with the present invention has a synergistic effect and therefore before or after irrigation. Spraying can effectively control weeds in rice crops.

The present invention relates to herbicide mixtures, in particular herbicide mixtures used for weed control of rice crops.

The present invention includes herbicide compositions as well as methods for weed control in rice crops.

According to a first aspect of the present invention, the present invention relates to a herbicide composition exhibiting a synergistic effect comprising molinate and oxyfluorfen.

According to a second aspect of the present invention, the present invention relates to a herbicide composition comprising molarate and oxyfluorfen in a weight ratio of about 500: 1 to 30: 1, respectively.

In addition, the present invention comprises molarate and oxyfluorophene in a weight ratio of about 500: 1 to 30: 1, respectively, and sprays a mixture having a synergistic effect on the crops, weeds, or locus of one or both of them. And weed control methods in rice crops.

The present invention relates to the use of herbicide molinate and oxyfluorfen compositions to control weeds in rice crops. Within the scope of the present invention the mixture exhibited a synergistic effect, that is, unexpected from the performance of each of the two herbicides on the same weeds in a similar environment.

Treatment of crops, weeds, or their distribution with a herbicidally effective amount of the herbicide molinate and oxyfluorfen mixture having a synergistic effect according to the present invention can control weeds in the presence of rice crops. We have found this synergistic effect when the mixture comprises these two herbicides in a weight ratio of about 500: 1 to 30: 1, preferably about 250: 1 to 40: 1, respectively. However, a feature of the present invention relates to the synergism between mololinate and oxyfluorfen, and there is no need to limit these herbicide mixtures to such weight ratios as synergism may also exist at other weight ratios.

When sprayed several times on rice grown in different ways, these mixtures control the weeds of rice synergistically or more than expected. For weed control, the mixture can be sprayed before planting rice, after planting rice (after irrigation, after germination), or after rice germinates and waters (after irrigation and after germination). direct seeded or seeded rice.

When used in combination, the two herbicides, molinate and oxyfluorfen, need not be sparged or sprayed simultaneously in physically mixed form. As long as both herbicides are present in the rice crop at the same time, they have a mixed effect regardless of the timing of their application. Thus, for example, two herbicides may be applied by physically mixing or one of them may be applied first. For example, one of the two herbicides is sprayed in the form of a controlled release formulation, such as a microencapsulation formulation, long before rice transplants, and the other is a conventional liquid while the first sprayed herbicide is present in the soil. Or in the form of a solid formulation. At this time, the weight ratio of the effective herbicide is included in the range described in this specification and a claim.

Thus, one of these herbicides can be sprayed in liquid or solid form, and a mixed product in liquid or solid form containing both herbicides can also be prepared. Conventional liquid formulations include emulsions, suspensions (including suspensions containing microcapsules), solutions, emulsifiable concentrates, and flowables. Solid products include particles, wettable powders, water-dispersible solid products (including water-dispersible particles containing microencapsulated pesticides), or dust forms. In general, these two types of compositions include solvents, wetting agents, suspending agents, anti-caking agents, dispersants, emulsifiers, antifreeze agents, anti-foaming agents, and other additives in addition to active herbicides. Other ingredients such as

One or both of these herbicides may be used in one of a variety of controlled release compositions of known type. Such compositions release the active ingredient relatively slowly into the environment and include encapsulated forms, microencapsulated forms, and various forms of controlled release particles.

The mixed product or composition according to the present invention may contain the two herbicides having a number of different physical forms. In some cases, simply physically mixing (“tank-mixing”) commercially available products containing the active ingredient, such as two emulsifiable concentrates containing these herbicides, as long as all the components of the products used are mixed together. It is also possible to manufacture the product. It is also possible to produce and sell packages containing each of the two herbicides in separate containers called "twin-packs." As a general rule, the molinate content must be greater than the oxyfluorophene content so that a twin-pack can be produced that contains a container of a relatively large moltenate-containing herbicide product and a container of a relatively small oxyfluorophene-containing herbicide product. This is particularly suitable for the herbicide composition of the present invention.

It is also possible to prepare a prepared composition ("preliminary mixture") containing these two herbicides. Since oxyfluorfen and molinate are liquid in the standard state, the composition in the liquid state tends to be preferred. Typical liquid compositions include emulsions (or microemulsions) having an emulsifiable concentrate containing the two herbicides and two phases containing one type of herbicide in each phase.

However, in recent years these two herbicides are also commercially available as solid preparations, i.e. immersion particles, so that products similar to solids containing both herbicides may be prepared as immersion particles, as well as other such as wet powders or dusts. Solid formulations may also be prepared.

In addition, using suitable ingredients and conditions, one can prepare microencapsulated products containing one or both herbicides in microcapsules, which microencapsulated products can be in liquid form (i.e., capsule suspension) or solid form (i.e., , Water-dispersible particles made by drying the microcapsule suspension). One type of liquid form may be a microcapsule suspension in a continuous liquid phase in which one of the herbicides is contained in the capsule and the other is in unencapsulated form. Another type may be a suspension containing moltenate and oxyfluorfen, individually encapsulated. Those skilled in the art will appreciate that the type of formulation or composition that may contain these two herbicides is not limited to those described herein.

The following examples relate to weed control with oxyfluorophene and molinate mixtures:

Example 1

This example relates to the spraying of a mixture of molynate and oxyfluorfen for weed control that is sprayed after irrigation and after germination on rice that has been transferred. Rice was individually separated in a trial tub and grown until 2 to 4 leaves emerged. The soil in the tank was watered and ground (harrowed) until mixed. Thereafter, rice was transferred to the mixture. Weeds (when two leaves came out) were individually grown and then planted or grown on mixed soil in the tank. Typically, herbicides have been sprayed with chemical or sprayed with chemicals after watering. A fixed amount of the mixture of molinate and oxyfluorophene was applied to the rice (Koshikari varieties) and weed skin (Echinochloa crusgalli, at the time after germination before irrigation in a greenhouse at the spraying ratios (shown in herbicide weight per hectare (g)) listed in Table 1. Plates containing ECHCG), small flower flats (Cyperus difformis, CYPDI), and Monochoria vaginalis (MOOVA). At the time of spraying, the rice was when three leaves came out, the blood was when two leaves came out, and the other two weeds were when two to three leaves came out. The test results are listed in Table 1 below as percent control or percent damage based on the control plate untreated mixture.

In the above embodiment it can be noted that:

1. When 726 g / ha of moltenate was sprayed on the blood, no weed control effect was shown. However, when 3 g / ha of oxyfluorfen (also showing no control effect) was added, the control rate was 99%. In the case of increasing the spreading ratio, some of the blood was controlled even with the moltenate alone. However, complete control was achieved when only 3-6 g / ha of oxyfluorfen was added.

2. Unexpected results were not obtained for Mono Korea, but unexpected results were obtained for small flower platides only when the oxyfluorfen application rate was high (25 g / ha). However, such high sparging ratio mixtures are within the scope of the present invention.

3. In some tests, the mixtures of molinate and oxyfluorfen within the range described herein did not show a synergistic effect. This is not unexpected because synergistic effects do not always occur for all possible herbicide mixtures or for all types of weeds within a given range.

Claims (14)

A herbicide composition comprising molarate and oxyfluorfen in a weight ratio of about 500: 1 to 30: 1. The method of claim 1, The herbicide composition having a weight ratio of about 250: 3.25 to 5: 1. The method of claim 1, The herbicide composition having a weight ratio of about 250: 1 to 40: 1. The method of claim 1, Herbicide composition in which the composition is in a liquid state. The method of claim 1, The herbicide composition in which the composition is in a solid state. The method of claim 1, Herbicide composition wherein the composition is a controlled release formulation. The method of claim 6, A herbicide composition in which at least one molinate and oxyfluorfen are contained in the microcapsules. A method of weed control in which the herbicidally effective amount of the composition according to claim 1 is sprayed on the crop, weeds, or the distribution of crops and / or weeds in the presence of a rice crop. A method of weed control in which the herbicidally effective amount of the composition according to claim 2 is sprayed on the crops, weeds, or the distribution areas of the crops and / or weeds in the presence of rice crops. A weed control method in which the herbicidally effective amount of the composition according to claim 3 is sprayed on the crops, weeds, or the distribution areas of the crops and / or weeds in the presence of rice crops. A method of weed control in which the herbicidally effective amount of the composition according to claim 4 is sprayed on the crop, weeds, or the distribution of crops and / or weeds in the presence of a rice crop. A method of weed control in which the herbicidally effective amount of the composition according to claim 5 is sprayed on the crop, weeds, or the distribution of crops and / or weeds in the presence of a rice crop. A weed control method in which the herbicidally effective amount of the composition according to claim 6 is sprayed on the crop, weeds, or the distribution of crops and / or weeds in the presence of rice crops. A weed control method in which the herbicidally effective amount of the composition according to claim 7 is sprayed onto the crop, weeds, or the distribution of crops and / or weeds in the presence of a rice crop.