JPS62108802A - Herbicide composition - Google Patents

Abstract

PURPOSE:A herbicide composition exhibiting more improved synergistic effects than in the case of individual use with a small amount of the herbicide, showing improved selectively herbicidal activity by foliar treatment, comprising a specific N-(4-pridine)-N'-phenylurea derivative and a controller for gramineous weeds as active ingredients. CONSTITUTION:The titled composition containing N-(2-chloro-4-pyridyl)-N'-(3- fluorophenyl)urea or N-(2-chloro-4-pyridyl)-N'-(3,5-difluorophenyl)urea and a controller for gramineous weeds, such as 2-(N-ethoxybutylimidoyl)-5-(2- ethylthiopropyl)-3-hydroxy-2--cyclohexen-1-one, etc. in a blending ratio of 1:10-10:1 by weight as active ingredients. EFFECT:Showing a wide herbicidal spectrum on gramineous weeds such as green foxtail, large crab-grass, etc., strong weeds such as Sida spiosa L., China jute, cocklebur, etc., providing crops with no pytotoxicity, having high safety to men, beasts and cultivated plants and advantageous workability.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a herbicidal composition of an N-(4-pyridyl)-N'-phenylurea derivative and a grass weed control agent, and the composition It can be used to weed stubborn problem weeds.

[Conventional technology]

Many herbicides have been put to practical use as field herbicides, and are widely used as single agents or mixtures.

The N-(4-viridi7)-N'-phenylurea fatty conductor of the present invention is known to be effective as a cytokinin-like activator (Japanese Patent Publication No. 14001/1983), and is effective in controlling field weeds. Something is not known.

[Problem that the invention seeks to solve]

Controlling weeds at low doses without causing chemical damage to crops has recently become a hot topic from the viewpoint of economic efficiency and environmental pollution. However, this requires high activity against weeds, a wide herbicidal spectrum, and a high degree of crop selectivity, and so far there is no product that fully satisfies all of these requirements.

In recent years, agriculture 1 [With increasing awareness of reducing material costs, the cost of herbicides, which are one of the agricultural materials, has decreased? In order to measure ii), a new treatment agent has been used to replace the conventional soil treatment method. In the soil treatment method, four chemicals are sprayed over the entire field regardless of whether weeds are present or not, resulting in huge chemical costs. In addition, harmful weeds that cannot be completely controlled will be controlled using the violet leaf treatment method after the crops germinate.
This raises the issue that noxious weeds cannot be eradicated without paying the price of increased chemical costs due to repeated use. The Shikaji Niba leaf treatment method takes into account the occurrence of one type of weed, and can arbitrarily spray the appropriate chemical for the type of weed where it is needed, making it possible to reduce chemical costs and efficiently control weeds.

[Failure to solve the problem]

The inventors of the present invention have carried out extensive testing and research with the aim of achieving high selectivity for crops and efficient control of weeds, and have found that among 4-pyridylphenylurea compounds, N-(2-chloro-4-pyridyl) -N'- , (3-fluorophenyl)urea (
(hereinafter abbreviated as compound A) and N-(2-chloro-4
-pyridyl)-N'-(5,5-difluorophenyl)
It has been found that a herbicide composition containing urine ff1 (hereinafter abbreviated as compound B) and a grass weed control agent has excellent selective herbicidal activity using the violet leaf treatment method.

The grass weed control agent as used in the present invention is a general term for the compounds (1) to (7) shown below that are effective against grass weeds.

(1) 2-(N-ethoquibutylimidoyl)-5(
2-ethylthiopropyl)-3-hydroxo-2-7chlorohexen-1-one (2) 2-Ci-(N-allylox/amino)
-butylidene,]-]5,5-dimethyl-4-methquinecarbonyl7chlorohexane-1,5-9-one, sodium salt (3) Methyl (±)-2-[4-(2,4-dichloro-phenoquine) Fenoki/] Propionate (4)
Butyl-2-(: a-(s-trifluoromethyl-
2-pyridyloki/)phenoquine]globionate (5) Ethyl-z-(4-(b-chloro-2-benzoxacilyl)phenoquine/]propionate (6)
Ethyl-2-[4-(6-chloro-2-quinoxalinyloxine)phenox7]propionate (7) Methyl-2-C4-(3-chloro-5-)lifluoromethyl2-pyridyloxine7)phenoxylate 7] Propionate When using the herbicide of the present invention, it can be used as it is by diluting it directly with water, or it can be used as a formulation of f and d using a method commonly used in the field of nijo production using an agrochemical adjuvant. It can be used in any form.

The agrochemical auxiliaries mentioned here include carriers (diluents) and other auxiliaries such as spreading agents and emulsifiers.

Wetting agents 1 Dispersants, fixing agents, disintegrants, etc. can be mentioned.

Examples of acid carriers include aromatic raw coals such as toluene and xylene, alcohols such as methanol, butanol, and glycol, ketones such as acetone, amides such as dimethylformamide, and sulfoquinones such as dimethyl sulfokide. , methylnaphthalene.

/Chlohequina/, animal and vegetable oils, fatty acids, fatty acid esters, etc.

Solid carriers include clay, kaolin, and Merck.

Diatomaceous earth, /Lica, Cal/Rum carbonate, Mo/Morillonite,
Examples include inotonite, feldspar, quartz, alumina, and sawdust.

Surfactants are usually used as emulsifiers or dispersants (4), such as higher alcohols such as trimethylammonium chloride, polyquine ethylene alkyl phenyl ether, lauryl (
Examples include cationic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants.

Not only can each formulation be used alone, but
If necessary, it may be mixed with other agricultural chemicals, such as fungicides, insecticides, acaricides, nematicides, or plant growth regulators. It may also be used in combination with fertilizers and other herbicides. You can also do it.

The herbicide of the present invention contains 0.1 to +00 t of the mixed active ingredient.
fft% preferably 0. 4% by weight of O5-70 (D range is suitable. The content of these mixed active rJχ components can be appropriately changed depending on the form of the preparation, application method, purpose, timing, location, weed growth situation, etc.).

The active ingredient of Sodeyoho per unit area is 1.
+1 The 4-hylydylphenylurea compound of (A) or (B) and each of the compounds of (7) to (7) above, 1:10 to 10:1 parts by weight. Approximately 0.01 to 5, preferably 0.1 to 2, KF per hectare of mixed active compound are used, preferably in a mixing ratio of 1:5 to 5:1 parts by weight. However, in special cases these ranges may be exceeded.

or lower is possible and sometimes even necessary.

〔Effect of the invention〕

The herbicide of the present invention exhibits extremely pronounced synergistic and synergistic effects by mixing the herbicides as in the present invention, even to the extent that each of the constituent single agents would not be sufficiently effective on its own. , exhibits accurate selective weed control, and shows remarkable control effects of PJ even against advanced weeds (weeds corresponding to the 8th to 10th leaf stage) in the next season due to its synergistic effect, and at the same time, a single agent is not sufficient. It achieved satisfactory selective control even for grass species for which no effective effects have been shown, and has a wide spectrum of herbicidal control including harmful weeds (e.g., weeds of the grass family, such as foxtail grass and crabgrass, and the harmful weed of American kingweed). It has been confirmed that they harvest (i) weeds such as Chikara, Ichibi, Onamomi, etc. In addition, the herbicide of the present invention has a reduction in t of each component.
Since this method has become possible, it is safer for humans, livestock, and cultivated plants, and is extremely advantageous in terms of work.

〔Example〕

The present invention will be explained below with reference to actual models.

Although the formulation examples of the present invention will be described in detail above the formulation examples, the supplementary angles and mixing ratios of the additives are not limited to these and can be used in a wide range.

Furthermore, the 5th part is the heavy drama section.

Formulation Example 1 Emulsion To 25 parts of compound (A) and 25 parts of compound number (+), 35 parts of a mixture of xy/lene and methylnaphthalene (+:+) was added and dissolved, and then polyoxy 7 ethylene alkyl phenyl ether was added. An emulsion is obtained by mixing K with 15 parts of a mixture (8:2) of carunium alkylbenzenesulfonate.

Formulation Example 2 Powder 5 parts of compound (B), 5 parts of compound number (4) and 90 parts of clay
A powder can be obtained by adding 100% of the powder and crushing the mixture.

Formulation Example 3 Wettable powder: 25 parts of Compound (A) and 25 parts of Compound No. (2) are mixed with a carrier of ±10 parts of diatom and 732 parts of Kaori, and further mixed with sodium lauryl sulfate and 2,2'-dinaphthylmethanesulfonic acid. 8 parts of the sodium mixture was mixed evenly and then ground to obtain a finely powdered water concentrator.

EXPERIMENTAL EXAMPLES The excellent herbicidal activity of the herbicidal composition of the present invention will be explained below using experimental examples.

Weed control test under upland cultivation conditions The test field was plowed to a depth of 20 to 25 cTn using a tractor according to the usual upland cultivation method.

After plowing, a certain amount of weeds and crop ridges were sown, and 20 days later, N foxtail 5.5-leaf stage, crabgrass 3.0-leaf stage, golden deer 1.0-leaf stage, and Japanese crocodile 1.0 leaf stage were planted.
．． 5-leaf stage, Onamia true leaf 1.5-leaf stage, Guizu book/leaf 1/
Wettable powders containing the active ingredient compounds listed in Tables 1 and 2 were diluted with a spray solution of 1 at per area on test plants grown at the 5-leaf stage, and sprayed in MM using a small sprayer. The test size is 1
Ward 4n? The control effect against each weed and the degree of chemical damage to dice were investigated on 20 pewters after treatment with the two-section binding agent.

The investigation was conducted based on the following criteria and the results shown in Tables 1 and 2 were obtained.

10: Weed killing rate relative to untreated area 100%9;
90 turn μ above 100% 8
: 80% or more 9
Less than 0% 7: 70
More than hair, less than 80 inches 6=
60% or more but less than 70% 5:
50% or more but less than 60% 4:
40% or more, less than 50%3;
60% or more, less than 4 sections 2: 20 or more sections, less than 60% 1:
10% or more 20% skinless 0:
An evaluation of "0" for havoc damage to less than 10% soybean indicates no chemical damage.

Table 1 Table 2

Claims (1)

[Claims] (1) N-(2-chloro-4-pyridyl)-N'-(3
-fluorophenyl)urea or N-(2-chloro-4
-pyridyl)-N'-(3,5-difluorophenyl)
A herbicide composition comprising urea and a grass weed control agent as active ingredients.