JP2002012511A - Algicidal and alga-proof agent for paddy and method for using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new fast-acting algicidal and alga-proof agent for paddies having long residual effectiveness. SOLUTION: This algaicidal and alga-proof agent for the paddies is characterized as comprising a basic copper chloride as an active ingredient. The fast- acting algicidal and alga-proof agent for the paddies is characterized as comprising the basic copper chloride and an iminoctadine salt as active ingredients. When the basic copper chloride is solely applied to the paddies in a development period of algae, the growth of the algae is gradually suppressed in about 2 weeks and the algae die. When the iminoctadine salt is added to the basic copper chloride and the resultant mixture is applied, the algae come to die in one week and the algicidal effects are exhibited in a fast-acting manner. The duration of the algicidal effects is >=2 weeks and even the residual effectiveness becomes sufficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a new algicidal and algicidal agent for paddy fields, and to an algicidal and algicidal method.

[0002]

BACKGROUND OF THE INVENTION Basic copper chloride and iminoctadine salts used as algicidal active ingredients in the present invention are known as agricultural and horticultural fungicides. These facts are described in, for example, "Agrochemical Handbook 1998 Edition" (published by the Japan Plant Protection Association on December 15, 1998). But,
It is neither described nor known that basic copper chloride or iminoctadine salt is effective as an algicide or algae preventive for paddy fields.

Further, basic copper chloride and similar bactericidal copper compounds as active ingredients used in the present invention,
It is known from the following literature that iminoctadine salts are effective as algicides for algae such as Spirogyra. (1) “Theory and practice of paddy field weeding” (Hakubunsha 1974 1974
It describes that copper algae such as blue spider can be controlled by diluting copper sulfate (600-900 g) into 180 liters of water and treating the transplanted paddy field. It also describes that the use of triazine herbicides is effective. (2) “The 37th Lecture Meeting on Weed Research”
39 pages "(published in 1998 by the Japanese Society of Weed Science) It is described that 1,1'-imino (octamethylene) diguanidium triacetate (generic name: iminoctadine acetate), which is a kind of iminoctadine salt, is effective for algae such as blue spider Have been.

(3) “Studies on the effects of some
fungicides on soil algae of paddyfield '' (Phykos
(1984), 23 (1-2), 191-201) It is described that basic copper chloride and the like are effective against paddy algae. (4) As a method for controlling paddy algae, 2-amino-3
It is known that it is effective to apply -chloro-1,4-naphthoquinone (generic name: quinoclamin) during the early stage to the early stage of algae generation in paddy fields (the above mentioned "Agrochemical Handbook 1998 Edition"). )). (5) "JP-A-3-56407" A lawn algae control agent containing a copper compound (such as basic copper chloride), a guanidine-based compound (iminoctadine salt) and the like as an algicidal active ingredient is described.

[0005]

Heretofore, for the control of paddy field weeds, sulfonylurea herbicides such as bensulfuron-methyl, pyrazosulfuron-ethyl, azimsulfuron and imazosulfuron (these are the generic names of herbicides described later) ) And various herbicidal active ingredients are widely used after transplantation in paddy fields. In particular, herbicide preparations, which have recently become widespread and are widely used, are referred to as implantable preparations (ie, jumbo is a registered trademark) and flowables (suspension). Is widely spread as an active ingredient, and a high herbicidal effect is brought about. However, after transplanting the rice, algae such as Spirogyra and Spirogyra occur and cover the water surface. In addition, diatoms enter the surface of the paddy field to form a colony, and during the day, oxygen generated by photosynthesis becomes bubbles, and the topsoil of the buoyant paddy field separates and rises or descends to the surface of the water. You will drift inside. In such a situation, even if a herbicide such as a jumbo agent or a flowable agent is applied to the paddy field, it becomes difficult to expand the water surface. For this reason, even if a conventional herbicide is applied after the occurrence of algae, sufficient spreadability of the drug cannot be obtained, and as a result,
Sufficient herbicidal effect is not exhibited.

[0006] In addition, after transplanting rice into a paddy field, if algae are generated and cover the water surface, the paddy rice after transplanting may be laid down by the influence of wind, etc., or the water temperature and the ground temperature may be lowered by blocking sunlight, resulting in a decrease in the water temperature and ground temperature. There are also problems such as the suppression of the initial growth of. For these reasons, controlling algae in paddy rice cultivation has become an important issue.

Therefore, there is a need for the development of a new algicide, an algicide for paddy fields, a new algicide, and a technique for using the algicide, which are fast, effective and long lasting. The present invention provides an algicide for paddy fields, an antialgal agent, and a technique for using the algicide, which meet such demands.

[0008]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems. As a result, the present invention has been achieved. That is, the present invention is based on the findings summarized as follows.

It has been found that the use of basic copper chloride as an active ingredient of an algicide exhibits excellent algicidal and algicidal effects. Further studies have shown that adding an iminoctadine salt to basic copper chloride and applying it in combination provides an algicidal effect with a rapid effect. That is, when basic copper chloride is applied alone to a paddy field during the algal development stage, the growth of the algae is gradually suppressed and dies in about two weeks. Also, when 1,1′-iminodi (octamethylene) diguanidium triacetate, a kind of iminoctadine salt, is added to basic copper chloride and applied, the algae will die in one week, and the expression of the algicidal effect will be effected quickly. . In addition, the duration of the algicidal effect will be 2 weeks or more, and the residual effect will be sufficient. In addition, when such an algicide containing basic copper chloride as an active ingredient or an algicide containing basic copper chloride and iminoctadine salt as an active ingredient is applied to a paddy field, it spreads smoothly on the water surface. It is possible,
It was found that there was no problem such as a decrease in the algicidal effect, and the desired algicidal effect was sufficiently obtained.

[0010] Accordingly, the first aspect of the present invention provides an algicidal and algicidal agent for paddy fields, which comprises basic copper chloride as an active ingredient.

In a second aspect of the present invention, there is provided a fast-acting algicidal and algicidal agent for paddy fields, comprising basic copper chloride and an iminoctadine salt as active ingredients.

Further, if the herbicide is applied together with the above-mentioned paddy field algicide and algicidal agent of the present invention before or after transplantation of the algae before or after the transplantation of the paddy rice, the herbicidal effect and algicidal effect are obtained. In addition, the anti-algal effect is simultaneously exhibited.
Therefore, it was found that the method can be a labor-saving algicidal and weeding method.

The following are examples of the iminoctadine salt having an action of providing the algicidal effect of the basic copper chloride with an immediate effect. (1) 1,1′-iminodi (octamethylene) diguanidium triacetate (generic name: iminoctadine acetate) (2) 1,1′-iminodi (octamethylene) diguanidine = tris (alkylbenzenesulfonate) (generic name: iminoctadine) Albesilate)

Furthermore, the action of the iminoctadine salt, which imparts a rapid effect on the algicidal activity against algae, is a bactericidal copper compound other than basic copper chloride, for example, basic copper sulfate, cupric hydroxide, 8-hydroxyquinoline. It is recognized that the same is exerted on copper, copper nonylphenolsulfonate, and the like.

Therefore, in the third aspect of the present invention, there is provided a rapid-acting algicidal and algicidal agent for a paddy field, comprising a bactericidal copper compound other than basic copper chloride and an iminoctadine salt as active ingredients. Provided.

The present invention is implemented as follows. (1) Formulation Method The basic copper chloride and iminoctadine salt used in the first and second inventions are both known as agricultural and horticultural fungicides, and commercially available ones can be used as they are. Basic copper chloride can be used alone or in combination with iminoctadine salts to be formulated into granules, jumbo agents, wettable powders, wettable granules, flowables and the like. Alternatively, a commercially available formulation (eg, a wettable powder) can be used as it is. Furthermore, in the case of the algicidal and algicidal agents according to the second present invention, a commercially available mixed preparation of basic copper chloride and iminoctadine salt (trade name: Befdor wettable powder) may be used, but it is commercially available. The individual active ingredient preparations may be mixed and used immediately before use. Further, by mixing these paddy algal killers according to the present invention, an algicide, and other paddy herbicides,
Formulated as granules, jumbo agents, wettable granules, flowables and the like, it is possible to simultaneously control algae and paddy field weeds labor-saving.

In the first aspect of the present invention, the algicidal and algicidal agents for paddy fields include:
Basic copper chloride is used alone. In this case, the amount of basic copper chloride added to the preparation is 10 to 90 parts, preferably 30 to 75 parts, per 100 parts of the preparation. In the algicidal and algicidal agent according to the second aspect of the present invention, basic copper chloride and one compound selected from iminoctadine salts are used in combination as an active ingredient. ： 0.01
１ ： 1: 10 (weight ratio). The content of these active ingredients in the preparation is not limited, but is usually 1 to 90 parts (parts by weight) in total, preferably 10 to 90 parts by weight.
~ 80 parts. The active ingredients used in the first and second inventions are dissolved or dispersed in a liquid carrier, or mixed with a solid carrier to form a composition. Surfactants can be added for the purpose of imparting emulsifying, dispersing, spreading and penetrating properties, and when formulating into various dosage forms such as granules, wettable powders, wettable powders, and flowables Depending on the necessity, various auxiliaries such as disintegrating agent of granules, binder, deodorant, antifoaming agent, antifreezing agent, antioxidant, ultraviolet ray inhibitor, active ingredient stabilizer can be added. Good. In addition, the above-mentioned preparations of various dosage forms can also be applied as a preparation in the form of a jumbo preparation which is packaged in a solid or water-soluble polymer film or the like.

Any liquid carrier may be used as long as it is commonly used, for example, water, alcohols such as methyl alcohol and ethyl alcohol, ketones such as acetone and methyl ethyl ketone, propylene glycol monomethyl ether and dipropylene glycol monomethyl ether. Ethers, such as kerosene, xylene, 1,2-
There are aromatic hydrocarbons such as dimethyl-4-ethylbenzene and methylnaphthalene, halogenated hydrocarbons such as methylene chloride, aliphatic hydrocarbons such as isoparaffin, esters such as ethyl acetate, and vegetable oils. It is not limited. One or more of these may be used in combination.

Any solid carrier may be used as long as it is commonly used, for example, mineral powders such as kaolin, bentonite, talc, potassium chloride, calcium carbonate, clay, shirasu balloon, perlite and vermiculite, starch, cellulose, Examples include, but are not limited to, vegetable powders such as glucose, maltose, lactose, xanthan gum and guar gum. There is no problem even if one or more of these are used in combination.

As the surfactant, various types can be used, and any type may be used as long as it is generally used. For example, a nonionic surfactant, an anionic surfactant,
Examples thereof include cationic surfactants, and there is no problem even if one or more of these are used in combination.

Any binder may be used as long as it is commonly used. Examples thereof include casein, gelatin, albumin, dextrin, glue, starch, sodium alginate, carboxymethylcellulose, methylcellulose, and the like.
Hydroxyethyl cellulose, polyvinyl alcohol,
Examples include, but are not limited to, polyvinylpyrrolidone and sodium polyacrylate.
There is no problem even if two or more species are used in combination.

Further, it can be used in combination with herbicides, fungicides, insecticides, plant growth regulators, fertilizers and the like. In particular, by blending one or more herbicides, the herbicidal effect as well as the algicidal and antialgal effects can be stably achieved.

Examples of herbicides that can be blended include, for example, 1-
(4,6-Dimethoxypyrimidin-2-yl) -3- [1-methyl-4- (2-methyl-2H-tetrazol-5-yl) pyrazol-5-ylsulfonyl] urea (generic name: azimsulfuron) , 1- (2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -3- (4,6-dimethoxypyrimidin-2-yl) urea (generic name: imazosulfuron), S-
Benzyl = 1,2-dimethylpropyl (ethyl) thiocarbamate (generic name: esprocarb), 2 ', 3'-dichloro-4-ethoxymethoxybenzanilide (generic name: etobenzanide), N, N-diethyl-3- Mesitylsulfonyl-1H-1,2,4-triazole-1-carboxamide (generic name: cafenstrole), 1- (2-chlorobenzyl)
-3- (1-Methyl-1-phenylethyl) urea (generic name: cumyluron), (RS) -2- (2,4-dichloro-m-tolyloxy) propionanilide (generic name: chromeprop), 1- [ 2- (cyclopropylcarbonyl) anilinosulfonyl] -3- (4,6-dimethoxypyrimidin-2-yl)
(Generic name: cyclosulfamuron), butyl = (R) -2
-[4- (4-cyano-2-fluorophenoxy) phenoxy] propionate (generic name: cyhalofop butyl), 2
-Methylthio-4-ethylamino-6- (1,2-dimethylpropylamino) -s-triazine (generic name: dimethamethrin), 2-methylthio-4,6-bis (ethylamino) -s-
Triazine (generic name: simetryn),

S-1-methyl-1-phenylethyl piperidine-1-carbothioate (generic name: dimepiperate), 2-chloro-N- (3-methoxy-2-thenyl) -2 ',
6'-dimethylacetanilide (generic name: tenylchlor), α- (2-naphthoxy) propionanilide (generic name: naproanilide), 5- (2,4-dichlorophenoxy)
Methyl 2-nitrobenzoate (generic name: bifenox), 2- [4- (2,4-dichlorobenzoyl) -1,3-dimethylpyrazol-5-yloxy] acetophenone (generic name: pyrazoxifene), ethyl = 5 -(4,6-dimethoxypyrimidine-2-galbamoylsulfamoyl) -1-
Methylpyrazole-4-carboxylate (generic name: pyrazosulfuronethyl), 4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5-pyrazolyl-p-toluenesulfonate (generic name: pyrazolate), O -3-tert-butylphenyl = 6-methoxy-2-pyridyl (methyl) thiocarbamate (generic name: pyributicarb), methyl = 2-
(4,6-dimethoxypyrimidin-2-yloxy) -6- (1
-Methoxyiminoethyl) benzoate (generic name: pyriminobac-methyl), S-ethyl 2-methyl-4-chlorophenoxythioacetate (generic name: MCPA thioethyl),

N-butoxymethyl-2-chloro-2 ', 6'
-Diethylacetanilide (generic name: butachlor),
2-chloro-2 ', 6'-diethyl-N- (2-propoxyethyl) acetanilide (generic name: pretilachlor),
(RS) -2-bromo-N- (α, α-dimethylbenzyl) -3,3
-Dimethylbutylamide (generic name: bromobutide), methyl = α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -O-toluate (generic name: bensulfuronmethyl), 3- (4-chloro -5-cyclopentyloxy-2-fluorophenyl) -5-isopropylidene-1,3-oxazolidine-2,4-dione (generic name: pentoxazone), 2- [4- (2,4-dichloro-m-toluoyl) ) -1,3-Dimethylpyrazol-5-yloxy] -4 ′
-Methylacetophenone (generic name: benzophenap), 3-isopropyl-2,1,3-benzothiadiazinone- (4) -2,2-dioxide (generic name: bentazone), S-
(4-chlorobenzyl) -N, N-diethylthiocarbamate (generic name: benthiocarb), 2,3-dihydro-3,3-dimethylbenzofuran-5-yl = ethanesulfonate (generic name: benfresate), 2-benzo Thiazole-2
-Yloxy-N-methylacetanilide (generic name: mefenacet), S-ethylhexahydro-1H-azepine-1-carbothioate (generic name: molinate), 2-
Methyl-4-chlorophenoxyacetic acid (generic name: MCPA),
Examples include, but are not limited to, 2,4-dichlorophenoxyacetic acid (generic name: 2,4-PA).

(2) Method of Use The algicidal and algicidal agents for paddy fields of the present invention are used as follows. (I) The time of application is the period before the paddy rice is transplanted with the herbicide before or after transplantation, or simultaneous or mixed application with the herbicide before and after the transplantation of rice, or early weeding. Either after the agent treatment. Especially, the algicidal effect is well exhibited when the application is performed 0 to 20 days after transplanting the paddy rice.

(Ii) The application rate is 5 to 600 g, preferably 50 to 300 g, as an active ingredient per 10 ares when basic copper chloride is used alone (first invention). Also,
In the second invention, basic copper chloride and 1,1′-iminodi
(Octamethylene) diminidium salt such as triacetate is 10 to 500 g in total, preferably
50-300 g. The compounding ratio is preferably as described above. By the combination of these two active ingredients, an algicidal effect that acts quickly on algae can be obtained. Further, when the herbicide as described above is used, a single agent of basic copper chloride, in any case of using it together with the iminoctadine salt, the herbicidal component is 0.1 to 500 g per 10 ares, preferably 0.3 to 300 g. What is necessary is just to mix. The application rates of these active ingredients may be adjusted in consideration of the degree of algae generation and the like.

(Iii) The form of the preparation to be applied and the method of application are not particularly limited, but application by the following method is generally preferred. That is, in the case of a wettable powder, 100-500 g per 10 ares is diluted with water, and 70-10
0 L (liter) may be sprayed on the water surface of the paddy field. In the case of water dispersible granules, 5 to 100 g per 10 ares may be diluted with 100 to 500 ml of water and sprayed on the water surface. In the case of granules,
What is necessary is just to spray 250g-3kg per 10 ares uniformly on the water surface of a paddy field. In the case of flowables, 100 to 1000 ml per 10 ares may be sprayed with the undiluted solution, and in the case of jumbo, per 10 ares, solid or small packaging (pack) 20 to
You only need to spray 5 to 40 100g.

The third algicidal and algicidal agent according to the present invention is also different from the second embodiment in that basic copper chloride is replaced with basic copper sulfate, cupric hydroxide, 8-hydroxyquinoline copper, copper nonylphenolsulfonate and the like. Can be formulated and used in the same manner as the method for formulating and using the algicidal and algicidal agents according to the present invention.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION

[0031]

EXAMPLES Next, examples of practical formulations of algicidal and algicidal agents for paddy fields according to the second invention of the present invention are shown in Production Examples 1 to 4. In the examples, all parts are parts by weight.

Formulation Example 1 (Wettable powder) Basic copper chloride 25 parts Iminoctadine acetate 20 parts Polyoxyalkylene alkyl ether 2 parts Sodium lauryl sulfate 2 parts Clay 51 parts Total 100 parts Components of the above composition are uniformly mixed And crushed to obtain a wettable powder. Formulation Example 2 (Water dispersible granules) Basic copper chloride 10 parts Iminoctadine albesilate 15 parts Sodium salt of β-naphthalenesulfonic acid formalin condensate 5 parts Sodium dodecylbenzenesulfonate 5 parts Lactose 65 parts Total 100 parts Above After the composition was mixed and pulverized, 10 parts of water was added and kneaded, and the mixture was granulated by an extrusion granulator equipped with a 0.5 mm screen, dried and sized to obtain a wettable powder.

Formulation Example 3 (Floable agent) Basic copper chloride 15 parts Iminoctadine acetate 20 parts Alkylene maleic acid copolymer 5 parts Xanthan cangum 0.5 parts Ethylene glycol 5 parts Potassium sorbate 0.5 parts Water 54 parts Total 100 parts Above Was homogeneously mixed and dispersed with a homomixer (manufactured by Nippon Tokuki Kika Kogyo Co., Ltd.) to obtain a flowable agent.

Formulation Example 4 (Jumbo preparation) Basic copper chloride 10 parts Iminoctadine acetate 10 parts Sodium lauryl sulfate 5 parts Polyoxyethylene styryl phenyl ether 2 parts Soluble starch 3 parts Calcium stearate 5 parts Calcium carbonate 65 parts Total 100 parts Above Was mixed and pulverized, and 7 parts of water was added and kneaded. The mixture was granulated by an extrusion granulator equipped with a 0.6 mm screen, and then dried and sized. 50 g thereof was packaged with a water-soluble film of polyvinyl alcohol (40 μm in thickness) to obtain a jumbo agent.

[0035]

When the algicidal and algicidal agents for paddy fields of the present invention are applied, the following effects are brought about. (1) The paddy field algicidal and anti-algal agents of the present invention, when applied to rice fields before and after rice transplantation, have an extremely high control effect on algae that occur in rice fields such as green algae, hibimidro, amidomidro, and diatoms. Is shown. (2) Even if applied before or after the occurrence of algae, it prevents growth of the algae and causes death. (3) According to the first aspect of the present invention, a high algicidal and algicidal effect is exhibited even when basic copper chloride is used alone. Will be expressed. In addition, the third present invention also exhibits a high algicidal effect similarly to these. (4) There is little concern about phytotoxicity and the like to paddy rice, and it can be used safely. (5) When one or a mixture of two or more of the above-mentioned various herbicides is added and used, the algicidal and algicidal effects are further enhanced, and the herbicidal effect is quickly expressed. Furthermore, other herbicides other than these examples can be expected to have the same algicidal and algicidal effects.

Next, the usefulness of the algicidal and algicidal agents for paddy fields of the present invention will be specifically described with reference to test examples. Test Example 1 1. Paddy soil (alluvial loam) was divided into fixed plots, water was poured into the plots, and two days later, rice seedlings (cultivar "Nipponbare", 2.1 leaf stage) were transplanted with four plants in one section. (Depth 1.
5cm). Fertilization was performed under the same conditions as general rice planting. 2. The treatments by applying the chemicals were as follows (1) to (3), and treatments were provided in respective test plots. (1) Pretreatment of algae development (one day after transplantation) (drop application) (2) Early stage treatment of algae development (fourth posttransplantation treatment) (same) Days after treatment) (spray application).

3. Drugs used (i) The second befdo wettable powder used as an algicide according to the present invention is a commercially available product (containing 73.5% of basic copper chloride and 2.5% of iminoctadine acetate) diluted 200 times with water, It was applied dropwise (Table 1) or sprayed (Table 2) to the water surface of the paddy field. (Ii)
In order to confirm the effects of each of basic copper chloride and iminoctadine alone and the combined use of these, basic copper chloride is a commercially available Deutsche Bordeaux wettable powder (containing 84.1% as basic copper chloride) Was diluted 200 times with water,
In addition, iminoctadine acetate is a commercially available “Kashiman solution”
(A formulation containing 5% as iminoctadine acetate; “Kashiman” is a registered trademark) diluted 10-fold with water, and used alone or in a mixture so as to have the amounts shown in Tables 3 and 4. Each was applied dripping to the water surface of the paddy field (Table 3,
4). 4. The results are as shown in Tables 1 to 4 below.

[0038]

(Note 3) Befdo wettable powder is a commercially available product with water
It was diluted 0-fold and applied dropwise. (Note 4) Nobies, annual broadleaf weeds, and fireflies were sown at the time of transplanting rice (about 50 grains / 0.08 m ² each). (Note 5) Commercially available 9% granules of ACN were used as quinoclamin granules, which were evenly sprayed on the water surface.

Befdor wettable powder suppressed the occurrence of algae for more than 2 weeks at an applied leaf amount of 0.4 g / m ² . Befdo wettable powder at a dosage of 0.1 g / m ² suppressed surface delamination for about 4 weeks over algae. The longer the dose, the longer the period. At a dose of 0.4 g / m ² or more, no surface delamination was observed up to 47 days after the treatment.

On the other hand, in the case of the quinoclamin granules, the application of 1 g / m ² causes the occurrence of algae and surface delamination from about the third week, and the occurrence of the quinoclamin granules from the about two weeks in the untreated area. became.

[0042]

As shown in Table 2, in the case of treatment with Befdor wettable powder, spray application (using a commercially available atomizer) during the early stage of surface delamination occurred, and almost two days after application, most of the floating surface delamination was applied. Submerged in water and no further ascent was observed for more than 20 days. Spray application of the reagent in the Spirogyra proliferating phase caused the growth of Spirogyra to remain suppressed, and the growth inhibitory effect of Spirogyra continued 30 days after application. In addition, application of Befudo wettable powder at 0.8 g / m ² did not cause any harm to paddy rice.

[0044]

[0045]

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A01N 25/14 A01N 25/14 25/34 25/34 Z 47/44 47/44 F-term (Reference) 2B121 AA19 CC05 EA26 FA02 4H011 AD01 BA01 BA06 BB11 BB18 BC03 BC06 BC07 BC08 BC18 BC19 BC20 DA02 DA11 DA15 DC01 DC05 DC06 DC08 DC09 DD01 DH02 DH03 DH08 DH10 DH14 DH19

Claims (8)

[Claims] 1. An algicidal or algicidal agent for paddy fields, comprising basic copper chloride as an active ingredient. 2. A fast-acting algicidal and algicidal agent for paddy fields, comprising basic copper chloride and an iminoctadine salt as active ingredients. 3. The algicidal composition for paddy fields according to claim 2, comprising basic copper chloride and 1,1'-iminodi (octamethylene) diguanidinium triacetate as an iminoctadine salt as active ingredients. , Anti-algal agents. 4. A fast-acting algicidal and algicidal agent for paddy fields, characterized by containing as active ingredients a bactericidal copper compound other than basic copper chloride and an iminoctadine salt. 5. The algicidal and algicidal agents for paddy fields are granules, wettable powders,
5. The algicidal and algicidal agent for paddy field according to claim 1, which is a kind of water dispersible granule or flowable agent. 6. An algicidal or algicidal agent for paddy fields, wherein the preparation of various dosage forms according to claim 5 is packaged with a water-soluble polymer film or a solid injection type preparation in the form of a jumbo preparation. The algicidal and algicidal agents for paddy fields according to claim 1, 2, 3, or 4 which are formulated into a formulation. 7. The algicidal or algicidal agent for paddy field according to claim 1, claim 2, claim 3, claim 4, claim 5, or claim 6 alone or in the place where algae are generated, or An algicidal and antialgal method characterized by being applied simultaneously with a herbicide. 8. An algicidal or algicidal agent for paddy fields according to claim 1, claim 2, claim 3, claim 4, claim 5 or claim 6, wherein the water surface or soil before and after transplantation of paddy rice in paddy fields. An algicidal or algicidal method characterized by being applied to a surface alone or simultaneously with a herbicide.