JP3309880B2 - Paddy field herbicide composition (2) - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a herbicidal composition comprising a triazole compound and pyributicarb as active ingredients.

[0002] In detail, when applied before or after germination of paddy weeds, it exerts a remarkably excellent synergistic herbicidal effect on annual weeds and perennial weeds, and has substantial phytotoxicity on rice. The present invention relates to a paddy field herbicide composition which does not give water.

[0003]

BACKGROUND OF THE INVENTION There are many kinds of paddy weeds, and the germination and growth time of each weed are not uniform. In particular, perennial weeds generally grow vigorously and their outbreaks last for a long time, which is a major factor that makes it difficult to control. It is very difficult to control all weeds with a single application of herbicide.

In recent rice cultivation, the introduction of mechanization and the early stage of transplantation have been rapidly spread, providing a more suitable place for weed generation than ever before, and the application of a herbicide having a narrow or small herbicidal spectrum is difficult. However, there is a tendency that complete weed control cannot be expected. For this reason, the same or different herbicides are used repeatedly several times, but such repeated use of herbicides not only requires a great deal of labor and cost, but also unfavorable effects such as paddy rice phytotoxicity and soil residue due to heavy application. Raises the problem.

[0005] Therefore, many kinds of weeds including annual weeds and perennial weeds can be killed by a single application, and it is effective for growing weeds, and the weed control effect can be maintained for a certain period of time.
There is a strong demand for the emergence of highly safe herbicides in paddy rice.

[0006] One of the compounds (I) used in the present invention
-(Diethylcarbamoyl) -3- (2,4,6-trimethylphenylsulfonyl) -1,2,4-triazole is a herbicidally active compound known in JP-A-2-1481.

The compound (I), when used alone as a paddy herbicide, has an excellent effect on annual weeds such as nobies, tamasatsuri and general broadleaf weeds. Demonstrates excellent herbicidal activity. However, perennial weeds such as pine flies, dog squirrels and squirrels, which have become a problem in recent years, have a high herbicidal effect until the early stage of growth. For weeds and Cyperaceae weeds, etc., the herbicidal effect is weak, and a high dose must be used in order to expect a sufficient effect.

The compound (II) of O- (3-tert-butylphenyl) N- (6-methoxy-2-pyridyl)-
N-methylthiocarbite) is a known herbicidally active compound called "pyributicarb".

When used alone as a paddy herbicide, pyributicarb exhibits excellent effects on annual paddy weeds such as Nobie, Tamayatsuri, Kikasigusa and Konagi, and practically no phytotoxicity is observed on rice by ordinary application. . However, its effect on perennial weeds is not sufficient,
Treatment at the time when weed growth has progressed is less effective against annual weeds.

JP-A-2-067209, JP-A-2-1-1
31413, JP-A-3-173808, JP-A-3-173
Japanese Patent No. 291203 discloses a mixture of a herbicide of compound (I) and another herbicide. However, the combination of admixtures disclosed in the numerous patent applications mentioned above,
Any of them merely suggests a possibility as a normal admixture for the purpose of labor saving.

[0011]

Means for Solving the Problems The present inventors have conducted intensive studies to solve these problems of the above-mentioned conventional herbicides. As a result, when the above-mentioned compounds (I) and (II) are used together,
Beyond the application range when each single agent is applied, a broad range of herbicidal spectrum is obtained, and the range of herbicidal range extends to annual grasses, cyperaceae, general broadleaf weeds and fireflies, and perennial weeds such as Sphagnum foliage. In addition, it has been found that the suitable period of application can be extended without compromising the safety of rice. The herbicidal composition of the present invention,
The effect is sufficiently exhibited when mixed at a dose much lower than that of a single agent, and the herbicidal effect is sufficiently increased as a single treatment, and the effect lasts for a long time. The present invention was found to exhibit a synergistic effect which was completely unpredictable, and completed the present invention.

The present invention relates to a compound (I)

[0013]

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And compound (II)

[0015]

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And a herbicide composition for paddy fields, characterized by containing

The herbicidal composition of the present invention is a novel combination, and synergism is observed in a wide range of mixing ratio, and the combination ratio is usually compound (I): compound (II) = 1: 1 to 1
10, preferably 1: 1 to 5.

The herbicidal composition of the present invention provides a high herbicidal effect by soil treatment before or after germination of paddy field weeds.

The herbicidal composition for paddy fields of the present invention can further contain various auxiliaries, various pesticides, etc. in addition to the compound (I) and the compound (II). In addition, the herbicidal composition of the present invention can be prepared according to a method known per se, for example, powders, granules, fine granules, tablets, suspensions, emulsions, wettable powders, concentrated emulsions, aerosols, and any other desired In the dosage form.

In particular, a flowable agent developed for the purpose of labor saving in recent years has a herbicidal effect by spraying the stock solution of the product directly from the ridge without entering the rice field, or by spraying only one side of the ridge. In addition, labor saving of drug application can be expected. Furthermore, the development of a throw-in preparation into a paddy field for the purpose of labor-saving spraying is being promoted. The property required for these preparations is that they do not cause harm to rice. This is because there is a possibility that the medicine is locally treated as compared with the conventional uniform application of granules. In this regard, the paddy field herbicide composition of the present invention is a remarkably safe herbicide composition, and is therefore very suitable for these preparations.

Examples of the auxiliaries include kaolinite,
Atavulgit, montmorillonite, diatomaceous earth, bentonite, talc, pyrophyllite, calcined hillite, silica, magnesium silicate, ammonium sulfate, magnesium sulfate, calcium sulfate, disodium phosphate, starch, water, aliphatic hydrocarbon, aromatic carbon Solid or liquid carriers or diluents such as hydrogen, alcohols, ethylene glycol, cellosolve, methyl cellosolve, etc .: alkyl aryl sulfonate, alkyl sulfate, polyoxyethylene alkyl phosphate, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl Emulsifiers, dispersants, wetting agents such as ether, polyoxyethylene sorbitan monolaurate, lignin sulfonate and the like: Other auxiliaries can be exemplified.

Furthermore, the herbicidal composition of the present invention may contain one or more other herbicides.
Suitable herbicides for mixing include pyrazolate, pyrazoxifene, benzofenap, bensulfuron-methyl, pyrazosulfuron-ethyl, imazosulfuron, bromobutide, dimuron and the like.

[0023]

The herbicidal composition for paddy fields of the present invention is extremely remarkable as compared with the case where each of the active ingredients of the compounds (I) and (II) is used alone, that is, cannot be expected when each of them is used alone. It shows a remarkably synergistic herbicidal effect. For this reason, the effect is sufficiently exhibited by mixing lower doses than the dose used alone.

Further, the herbicidal composition of the present invention can obtain a broad herbicidal spectrum beyond the application range of each single agent application without impairing the safety to rice, and can extend the suitable period of application. It can kill and control many kinds of problem weeds.

Further, the herbicidal composition for paddy fields of the present invention has a sufficiently high herbicidal effect as a single treatment, and the effect lasts for a long time.

The herbicidal composition of the present invention can be used in paddy fields.
For annual grasses, cyperaceae, annual weeds such as general broadleaf weeds and perennial weeds such as fireflies and sedges, it shows an excellent herbicidal effect in the growing season before its occurrence, and at low application rates. Many kinds of problem weeds can be killed. Examples of such an annual paddy field weed include porpoise, tamaya-tsuri, konagi, kikasigusa, azena, abnomeki, mizuhakobe, and the like. In addition, examples of perennial paddy weeds include perennial paddy weeds such as dog squirrels, water flies and pine trees.

Hereinafter, the composition and effect of the herbicidal composition for a paddy field of the present invention will be more specifically shown by way of Examples and Test Examples, but the present invention is not limited thereto.

[0028]

Example 1 Wetting agent Compound (I) 15.0 parts by weight Compound (II) 25.0 {sodium lignin sulfonate 10.0} kaolinite 49.0 {sodium dioctyl sulfosuccinate 1.0} After mixing, the diameter of the particles is 5 with a jet mill.
After pulverizing to a size of μm or less, the powder was remixed to obtain a wettable powder.

[0029]

Example 2 Granules Compound (I) 0.7 parts by weight Compounded part (II) 1.5 {Sodium dioctyl sulfosuccinate 0.5} Bentonite 35.0 {Talc 62.3} The above components were mixed, The mixture was pulverized by a jet mill, kneaded by adding about 20% of water, and extruded with an extrusion granulator having a diameter of about 0.7 mm to obtain a granule by cutting into a length of about 3 mm.

[0030]

Example 3 Flowable compound Compound (I) 3.0 parts by weight Compound (II) 10.0 {sodium dibutylnaphthalenesulfonate 2.0} Demol Ep (polysorb) 3.0 {propylene glycol 10.0} And 42.0 parts by weight of water are mixed.
Then, 17 kg of steel balls are added to g, and the mixture is pulverized with an attritor 1S for 2 hours to obtain a slurry I. Separately, 0.1 part by weight of xanthan gum and 19.9 parts by weight of water are mixed to obtain an aqueous solution of xanthan gum. Separately, 0.3 parts by weight of Vegum R and 9.7 parts by weight of water are mixed to obtain a Vegum R slurry.
Thereafter, 70 parts by weight of the slurry I, 20 parts by weight of the xanthan gum aqueous solution and 10 parts by weight of the Vegum R slurry were stirred and mixed to obtain a flowable agent.

[0031]

[Test example]

(Judgment criteria) 10: Growth inhibition rate 95% or more (almost completely withered) 9: Growth inhibition rate 90 to 94% 8: Growth inhibition rate 80 to 89% 7: Growth inhibition rate 70 to 79% 6: Growth inhibition rate 60 -69% 5: Growth suppression rate 50-59% 4: Growth suppression rate 40-49% 3: Growth suppression rate 30-39% 2: Growth suppression rate 20-29% 1: Growth suppression rate 10-19% 0: Growth inhibition rate of 9% or less (almost no effect) In Tables 1 and 2, EO is red foxtail, BL is broadleaf weed, MV is oak, SJ is firefly, CS is watermelon, and OS is rice. Show.

[0032]

[Test Example 1] The paddy soil was filled in pots effects 100 cm ² for barnyardgrass in transplant after flooding treatment, the dormancy was Echinochloa seeds mixed in the surface layer 1 cm, flooded with transplanted seedlings of 2-leaf stage rice The plants were brought to the water state and grown in a greenhouse. At the 1st leaf, 2nd leaf, and 3rd leaf stages of the rice flour, a predetermined amount of the wettable powder prepared in Example 1 was subjected to flooded soil treatment, and 21 days later, the growth of the rice flour was examined according to the above criteria. The results are shown in Table 1.

[0033]

[Table 1]

As is clear from the results shown in Table 1, the herbicidal composition of the present invention shows a strong herbicidal activity by a synergistic effect without showing any phytotoxicity to paddy rice, and shows the first to third leaf stages. Also showed an effect of extending the suitable period of use.

[0035]

[Test Example 2] Effect on perennial and annual broadleaf weeds in flooding treatment after transplanting Filling a paddy field soil into a pot of 600 cm ² , and awakening dormant seeds of a breeding breeder, firefly and oak, and an annual broadleaf weed (Kikagusa, Azena etc.). It was mixed with 1 cm of the surface layer. A dormant awaken tuber was planted, and a two-leaf rice plant was transplanted into a flooded state and grown in a greenhouse. A predetermined amount of the granules prepared in Example 2 was subjected to flooded soil treatment at the 2.5 leaf stage of the Japanese millet, and a survey was performed 21 days later. The results are shown in Table 2.

[0036]

[Table 2]

As is clear from the results in Table 2, the herbicidal composition of the present invention showed no phytotoxicity to rice.
It showed a synergistic effect on the control of a wide range of weeds, and in particular, showed remarkable efficacy against oil flies.

Continued on front page (72) Inventor Takashi Sakamoto 1041 Yasu-cho, Yasu-cho, Yasu-gun, Shiga Prefecture Sankyo Co., Ltd. (72) Inventor Masahiro Teramura 1041 Yasu-cho, Yasu-cho, Yasu-gun, Shiga Prefecture Sankyo Co., Ltd.Examiner in Sankyo Co., Ltd.Naoki Kawano (56) Reference Document JP-A-2-1481 (JP, A) JP-A-3-279368 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01N 43/653 CA (STN)

Claims (1)

(57) [Claims] 1. Compound (I) And compound (II) And a herbicide composition for paddy fields, comprising: