KR810002007B1 - Herbicide Composition - Google Patents

Abstract

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Description

Herbicide Composition

The present invention relates in particular to herbicidal compositions for use in water crops.

In general, herbicides are insufficient if they are incapable of killing all of the weeds in question. Thus, for example, if herbicides survive some kind of weeds, they will continue to grow and harm crops. Therefore, it is desired that herbicides be able to kill weeds, those with a wide range of control, that is, many kinds of weeds.

In recent years, the perennial weeds of rice crops that are difficult to control with known herbicides have increased rapidly. This is partly due to the reduction of contention between the weeds as a result of the killing of general weeds, which are easy to control, and partly due to the premature planting accompanied by mechanical migration. This is because the initial generation of tap water decreases and environmental conditions are susceptible to new weeds. Another reason is the omission of heavy tilling and variations in tillage techniques.

Since the breeding sources of these perennial weeds are tubers or calibers, they have a deeper incidence than the seed breeding gardens and do not have the same timing. In addition, the growth and development of these perennial weeds is vigorous.

Therefore, it is desired to develop effective herbicides capable of continuously controlling such weeds.

The present inventors have found that the use of two or more thiol carbamate-based mixtures can achieve a stronger herbicidal effect than expected when using each compound alone.

According to the present invention, there is provided a herbicidal formulation which is composed of carbamic acid S- (4-chlorobenzyl) N, N-diethylthiol as an active ingredient and at least one compound of the following structural formula (I).

Wherein R and R 'each represent a lower alkyl group, such as methyl, ethyl, n- or iso-propyl or n-, iso-secondary- or tert-butyl, or R and R' together with the point N atom Groups that form a heterocycle, such as a piperidino or hexahydro-azino ring.

Carbamic acid S- (4-chlorobenzyl) N, N-diethylthiol (also known as wenbenthio carbocurol) is in particular herbicidal against blood (Echicnhloa crusgalli) and femur (Eleocharis acicularis), It is actually widely used for this purpose. However, benthiocarbos are ineffective against broadleaf weeds such as Monochoria Vaginalis, Cyperus serotinus snag (Sagittaria pygmaea) and tadpole gourd (Scirpus mucronatus or juncoides). And low activity against perennial weeds, including Eleochario kuroguwai.

It is known that other thiol carbamate compounds also have herbicidal effects. However, these compounds have not been put to practical use because they are effective for water crops when used in sufficient amounts for weed control.

The present inventors have studied the herbicidal properties of a series of thiol carbamic acid-based compounds, and found that these compounds exhibit potent activity in the early germination or seedling stages of weeds and are fast-acting. As a result of further study, it was found that the use of venticarb with a thiol carbamate-based compound can provide an excellent synergistic effect than expected when using each compound alone and no weakness against tap water crops. .

In the herbicidal compositions of the present invention, the weight ratio of venticarbo and the compound of formula (I) or compounds is generally in the range of 1: 10 to 1: 0.05, preferably in the range of 1: 2 to 1: 0.2.

The structural formula of benthiocarbo is as follows.

Illustrative specific compounds of formula (I) to be used in the compositions are those having the following formula.

These compounds are poorly soluble in water but soluble in organic solvents such as toluene, xylene, acetone and alcohols.

The rate of use of this harmful weed control mixture depends on the type of weed and the particular compound of formula (I) selected. However, the present mixture is usually used in an amount of 50 to 1000 g per argon, preferably in an amount of 100 to 500 g per 10 argon.

The mixture used as an active ingredient may itself be used for herbicidal purposes, but is usually used in the form of a composition in which the active ingredient is mixed with a solid or liquid diluent or carrier.

Such compositions include active ingredients and solid diluents such as kaolin, clay, bentonite, platy diatomaceous earth, dolomite, calcium carbonate, talc, magnesia powder, acidic clay, gypsum, hewitt's earth, diatomaceous earth and vermiculite or It may also be in the form of a powder or granules composed of a carrier. For example, the seed lubricating composition may be composed of an adhesion aid (eg, mineral oil) of the present composition to the seed.

The composition may also be in the form of a powder or granules of harvesting agents consisting of a powder containing a filler and a suspending agent or a wetting agent for facilitating dispersion in the liquid of the granules.

Wetting agents or emulsions may sometimes be prepared by dissolving the active ingredient (s) in an organic solvent containing an electrodeposition agent, dispersant or emulsifier and then adding the mixture to water which may also contain an electrodeposition agent, dispersant or emulsifier (s). have. Suitable solvents include acetone, isopropyl alcohol, propylene glycol, diacetone alcohol, benzene, toluene, kerosene, methylnaphthalene and cyclohexane.

The composition to be used as a propellant can also be of the aerosol type which is maintained in a vessel under pressure in the presence of a propellant such as fluorotrichloromethane or dichlorodifluoromethane.

By incorporating suitable additives such as diffusion rate, adhesion and rain resistance enhancers to the treated surface, different compositions can be well suited to the requirements.

The composition may also be in liquid form for use as a disinfectant or dusting agent which is a general aqueous dispersant or emulsion which contains the active ingredient in the presence of one or more medicaments, ie a hydrating, dispersing, emulsifying or suspending agent. Each of these drugs may be a cationic, anionic, nonionic or amphoteric drug.

Suitable cationic agents are quaternary ammonium compounds such as cetyltrimethylammonium bromide and alkylpyridinium chlorides. Suitable anionic agents include soaps, salts of aliphatic monoesters of sulfuric acid (eg sodium lauryl sulfate), sulfonated aromatic compounds (eg sodium dodecyl benzenesulfonate, sodium lignosulfonate, calcium or ammonium, butylnaphthalene sulfonate and di Isopropyl and a mixture of sodium triisopropylnaphthalenesulfonate). Suitable nonionic agents include condensation products of ethylene oxide with fatty alcohols such as oleyl alcohol or cetyl alcohol, or alkylphenols such as octyl alcohol, nonylphenol and octyl crenol. Other nonionic agents include partial esters derived from long chain fatty acids and hexitol anhydrides, condensation products between these partial esters and ethylene oxide and lecithin. Positive agents include alkyldimethylbetaine and dodecylaminoethyl glyserine. As suspending agents, hydrophilic clades (e.g. polyvinylpyrrolidone and sodium carboxymethylcellulose) and vegetable rubbers (e.g. acacia rubber and tragacanth rubber) are suitable.

Compositions for use as aqueous dispersants or emulsions are generally supplied in a pesticide form containing high proportions of the active ingredient, which must be diluted with water before use. These pesticides should sometimes have good shelf life, and after storage they should be able to be distilled with water to form a liquid which remains homogeneous for a sufficient time to be spread with a known spreader.

The composition of the present invention is useful for treating other compound (s) with herbicidal activity, such as 2-methylthio-4,6-bis-alkylamino-s-triazine, 2-methyl-4-chlorophenoxyacetic acid and 2-methyl- It may also be composed of 4-chlorophenoxybutyric acid and salts, esters or amides thereof.

When the present invention is described in detail as an embodiment as follows. Percentages herein are by weight unless otherwise indicated. These examples are intended to illustrate the invention, but not to limit the invention.

Examples 1 to 8 relate to the composition according to the present invention, and Examples 9 to 12 relate to herbicidal effects and weakness of the composition of the present invention.

Example 1: Powder

The following ingredients were mixed and ground in the proportions indicated to obtain a powder that can be directly dispersed in weeds or their habitats.

Example 2 Hydration

The following components were mixed and ground in the proportions indicated to obtain a hydrated composition. The composition is easily dispersed in water as desired and used as a spreading agent.

Example 3: Hydration

The following ingredients were mixed and ground in the proportions indicated to obtain a hydrating agent. This composition is easily dispersed in water and used, for example, as a spreading agent.

Example 4 Hydration

The following components were obtained by the above-described method according to the ratios indicated.

Example 5 Hydration

The following ingredients were obtained in a similar manner to the method described above according to the proportions indicated.

Example 6 granulation

The same amount of benthiocarb and mixture 2 were dissolved in acetone, and the acetone solution was sprayed onto the diatomaceous earth particles to impregnate the particles so that the total amount of the active ingredient, that is, the bentocarb and the compound 2 was 4%, and the acetone solvent was evaporated off. This composition is used in a known manner so that the granules are buried in the soil.

Example 7 Granulation

The following ingredients were sufficiently mixed and ground in the proportions indicated to obtain a homogeneous powder mixture, which was kneaded by addition of a small amount of water, and the dough was granulated in an extruder to obtain granules and then dried.

Example 8 Granulation

A granule was prepared in the same manner as in Example 7, except that the following components and proportions were used.

Example 9

This example compares the synergistic herbicidal effect on weeds growing in the paddy field of the mixture of active compounds according to the present invention to the effect of using each compound alone.

Wagner porcelain pots with a cross-sectional area of V5000 were filled with soil harvested from the upper layers of rice fields containing Monochria vaginalis seeds. After the soil was well selected by adding water, 20 seeds of Echinochloa crusgalli and Scirpus mucronatus, which were promoted germination per seed pot, were sown into the soil and watered to 3 cm depth. At the same time, 2.5 leaf seedlings were transplanted for 2 weeks (3 per week) per pot. The drug was irrigated by diluting a predetermined amount of hydrating agent of various compounding ratios shown in Table 1 in 10 liters after 10 days of implantation. Treated pots were stored in a greenhouse at 20-25 ° C. for 1 month. Then, the herbicidal effect and the degree of weakness were observed and evaluated. The results are shown in Table 1 below.

TABLE 1

In the table above,

Each figure indicating herbicidal effect has the following meaning.

Example 10

Wagner porcelain pots with a cross section of 1/5000 are filled with shapes taken from the upper layers of paddy fields containing waterborne seeds. After the soil was well picked by water, approximately 20 seeds of blood, tadpole, and plantain Talisman (Alisma canaliculatum) were seeded in the soil, and each pot was freshly watered to a depth of 3 cm. Next, a predetermined amount of hydrating agents of various compounding ratios shown in Table 2 was diluted in 100 liters of water per 10 liters, and then irrigated. Two days after treatment, 2.5 leaf seedlings were transplanted for 2 weeks (2 minutes 1 week) per pot.

Pots thus treated were stored in a greenhouse at 20 to 25 ° C. for 1 month. Thereafter, the herbicidal effect and degree of understanding were observed and evaluated. The results are shown in Table 2.

TABLE 2

Example 11

In the previous year, the rice paddy where the weeds such as blood, water cane, tadpole, and plantain grew lush, such as taxa, was picked and machined. After transplantation, inon was divided into 4 m 2 units each, and the granules were uniformly sprayed by hand in various formulation amounts shown in Tables 3 and 4 under the conditions of fresh water 5 cm after 10 and 15 days after transplantation, respectively.

The growth stages of each weed 10 and 15 days after transplantation were as follows.

10 days 15 days 10 days 15 days

B 1.5-2 Leaf Phase 3-3.5 Leaf Plantain Taxi 2-2.5 Leaf Phase 3-4.5 Leaf Phase

Watery cane 2 seasons 3 seasons Other broadleaf weed germination 3 seasons

Orlane High-Thickness 2 seasons 3-4 seasons

After 30 days of drug treatment, the herbicidal effect and the degree of damage to the tap water of the disclosed compounds were observed and evaluated according to the criteria of 0 to 5 below (as defined in Table 1).

5: complete kill

0: no harm or no harm (weak to rice wool).

A grade of 0 for damaging rice plants means that the rice plants were not harmed at all by the weeding process. The results are shown in Tables 3 and 4 below.

TABLE 3

TABLE 4

Note: Simethrin is 2-methylthio-4,6-bis-ethylamino-S-triazine. MCPBethyl is an ethyl ester of 2-methyl-4-chlorophenoxybutyric acid.

Example 12

The method of Example 11 was repeated except that the rice paddy was divided into 5 m 2 units and the granular compound was dispersed one day after transplantation, that is, before weed germination.

Its observation evaluation and criteria were the same as in Example 11. The results are shown in Table 5.

TABLE 5

Note: CNP is 2,4,6-trichlorophenyl-4-nitrophenylether.

Claims (1)

Carbamic acid S- (4-chlorobenzyl) N, N-diethylthiol carbamate and at least one compound represented by the following structural formula (I) contain a mixture of 1: 2 to 1: 0.1 weight ratio as an active ingredient Herbicidal composition.

Where R and R 'are each a group which forms a heterocyclic ring together with a lower alkyl group or adjacent N atoms.