JP3467290B2 - Algae and disease control agent for cultured seaweed - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to algae and disease control agents for combating adventitious algae such as aonori attached to cultured seaweed nets and exterminating adhering bacteria such as red rot fungus and jar fungus.

[0002]

2. Description of the Related Art When red rot occurs in seaweed cultivation, the quality of the seaweed deteriorates, and if it becomes severe, there is a risk of no production. If algae such as blue-green algae are mixed in the product, the price will drop.

Generally, in seaweed aquaculture, a draining operation is carried out as a method for exterminating weeds and preventing disease. This is a method of removing the seaweed net from the seawater once and drying it, but this method is not very effective even though it takes a lot of labor and time.

Another method is to exterminate algae by immersing in an organic acid solution such as citric acid or malic acid. As shown in Comparative Examples 1 and 2, there is a drawback that it takes too much time to exterminate aonoori and to exterminate red-rot fungi. When a red-rot fungus develops, it has a high infectious capacity and must be quickly and completely killed.

Nori producers average 100 to 200
The seaweed nets are collected in one sheet, and the shorter the treatment time, the better the workability. For example, if the treatment is shortened by 5 minutes, the time can be saved from 500 minutes to 1000 minutes, and thus more laver net can be treated.

In Japanese Patent Publication No. 46-35873, P-
There has been proposed a method for controlling erythema rot of red sea bream using oxybenzoic acid or its ester.

JP-A-50-121425 discloses a saturated aliphatic carboxylic acid having 1 to 4 carbon atoms, a saturated or unsaturated carboxylic acid having 2 to 4 carbon atoms, glycolic acid, lactic acid, tartaric acid, malic acid, citric acid. An algaecide containing one or more organic carboxylic acids selected from acids is disclosed. Although this document exclusively describes the action of germicidal algae, there is no description of red-rot fungi.

Japanese Patent Publication No. 60-13647 discloses that it contains citric acid in an amount of 0.3 to 5.0% by weight and has a pH of 1.0 to 6.
Nori algae to be immersed in the treatment liquid of No. 0, extermination and prevention of disease are described.

In Japanese Patent Publication No. 60-13648, a pH of 1. is obtained by adding an inorganic acid such as hydrochloric acid, nitric acid, sulfuric acid or phosphoric acid.
A seaweed aquaculture method for controlling weeds and diseases, which is 0 to 4.0, is described.

Japanese Examined Patent Publication No. 60-21950 discloses a fertilizer for seaweed cultivation containing phytic acid or a salt thereof as an active ingredient, a preventive effect against red rot, and a diatom control effect.

Japanese Unexamined Patent Publication (Kokai) No. 57-8722 discloses a seaweed aquaculture method in which a seaweed net is treated with a treatment solution containing phosphoric acid or a salt thereof to remove and prevent diseases such as weeds and red rot. It is disclosed.

Japanese Unexamined Patent Publication (Kokai) No. 60-87202 discloses a fungicide for seawater bacteria of edible seaweed containing adipic acid as an active ingredient.

Japanese Unexamined Patent Publication (Kokai) No. 60-244245 discloses a method of algicidal treatment in which a fumaric acid in a saturated amount or more is present, and at least one of malic acid, citric acid, tartaric acid and succinic acid is used in combination. There is also a statement to the effect.

Japanese Patent Laid-Open No. 60-248121 discloses algae and acupuncture fungi by immersing in a treatment solution containing one or more of halogenated carboxylic acids such as chloroacetic acid, dichloroacetic acid and trichloroacetic acid. A seaweed aquaculture method for exterminating illness, red spot disease, etc. is disclosed.

Japanese Unexamined Patent Publication (Kokai) No. 62-21784 discloses a liquid fertilizer which is also used as an algicidal agent for aquaculture, which is composed of an acidic buffer solution containing dilute hydrochloric acid as a main component, and nitrates, ammonium salts and phosphates.

Japanese Unexamined Patent Publication (Kokai) No. 62-190103 discloses a repellent of gluconic acid as an active ingredient for Pythium spp. And Olpidiopsis spp.

Japanese Unexamined Patent Publication (Kokai) No. 1-279805 discloses a repellent for algae and bacteria containing monosodium fumarate and / or monopotassium fumarate as an active ingredient.

Japanese Patent Application Laid-Open No. 2-25404 discloses a pesticide containing fumaric acid and / or fumarate and at least one selected from the group consisting of sodium carbonate, sodium hydrogen carbonate, potassium carbonate and potassium hydrogen carbonate. Disinfectants for algae and bacteria which are dissolved in water or seawater to form monosodium fumarate and / or monopotassium fumarate are disclosed.

Japanese Unexamined Patent Publication No. 2-291218 (Japanese Patent Publication No.
No. 47,781) discloses an algaecide method in which fumaric acid in an amount exceeding the saturated amount is present in a state of being coated with a coating means having water permeability, and the substance to be treated is dipped in the treatment liquid. .

Japanese Unexamined Patent Publication (Kokai) No. 5-139913 discloses an algaecide containing 0.1 to 2.0% by weight of lactic acid and a pH adjuster and adjusting the pH to 1.5 to 2.0. Has been done. Further, in this specification, it is described that it is also effective for controlling red rot fungus.

[0021]

The object of the present invention is to provide algae, further red rot fungi, without damaging the seaweed itself.
It is an object of the present invention to provide a drug capable of simultaneously exterminating adherent bacteria such as pot bacteria in a short time.

[0022]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to solve the above problems, and as a result, ketoglutaric acid was found in bacteria such as red rot fungi and vase-like fungi even against weeds. On the other hand, they have found that they can be eliminated in a short time, and have completed the present invention.

That is, the present invention is as follows. (1) A weed alga in cultured seaweed and a disease control agent, which contains ketoglutaric acid as an active ingredient.

(2) An agent for controlling weeds and diseases of cultured seaweed containing no less than 0.1 amount / volume% of ketoglutaric acid.

(3) Ammonium nitrate, ammonium chloride, monoammonium phosphate, urea, sodium nitrate, nitric acid as a nitrogen source in an aqueous solution of 0.1% by weight / volume of ketoglutaric acid; 1 potassium phosphate as a phosphorus source, phosphoric acid A weed alga in cultured seaweed and a disease control agent, which comprises at least one selected from the group consisting of monosodium and inositol phosphate 6-phosphate (phytic acid).

(4) In an aqueous solution containing 0.1% by weight or more of ketoglutaric acid, citric acid, malic acid, tartaric acid, succinic acid, gluconic acid, acetic acid, (mono-, di-, tri) chloroacetic acid, lactic acid, maleic acid , A fugal acid, formic acid, hydrochloric acid, phosphoric acid, nitric acid, sulfuric acid, and at least one selected from the group consisting of aquacultured seaweed algae and disease control agents.

The seawater solution containing 0.5% by weight / volume of ketoglutaric acid according to the present invention was used to exterminate red-rot fungi in 1 minute as shown in Example 1, and to aonori by dipping for 5 minutes. can do.

The pesticide of the present invention comprises ammonium nitrate, ammonium chloride, monoammonium phosphate as a nitrogen source.
Phosphoric acid 1 as a phosphorus source such as urea, sodium nitrate, nitric acid, etc.
Potassium / monosodium phosphate / inositol phosphate 6-
Phosphoric acid (phytic acid) can also be included. In particular, when phosphoric acid is used in combination, it is possible to alleviate the damage to the seaweed caused by the acid and to produce soft seaweed.

In order to further enhance the effect of controlling weeds and diseases, citric acid, malic acid, tartaric acid, succinic acid, gluconic acid, acetic acid, (mono, di, tri) chloroacetic acid, lactic acid, maleic acid, fumaric acid -It is also possible to add acids such as formic acid, hydrochloric acid, phosphoric acid, nitric acid and sulfuric acid.

The pesticidal agent of the present invention is used by a method of immersing or spraying a seaweed cultivation net in which weeds such as blue-green algae grow. Similarly, the seaweed culture net infected with red rot fungus is dipped or sprayed in the pesticide.

By contacting the laver leaf bodies infected with the algae or diseases with the exterminating agent as described above, the algae and diseases are selectively exterminated without damaging the laver. Treat the seaweed net that is not diseased as a preventive measure. In addition to the control of red-rot fungi and aonori, it also has the effect of removing bacteria and diatoms attached to seaweed.

(Example 1, Comparative Examples 1 to 4) Red-rot fungus extermination test Each 0.5 W / V% seawater solution of ketoglutaric acid, citric acid, malic acid, gluconic acid, and tartaric acid was prepared and used as a red-rot fungus. The infected laver leaf is soaked for 20 seconds, 1 minute, 2 minutes, 3 minutes ... 10 minutes, then taken out, washed with seawater, and statically cultured, and the state after 2 days is observed under a microscope to show red rot. The time to exterminate the bacteria was investigated. The treated water temperature was 20 ° C.

Aeonori was immersed in a 0.5 W / V% seawater solution of each organic acid in the aonomori eradication test, taken out at 1-minute intervals from 1 minute to 30 minutes, washed with seawater, and then statically cultured. The immersion time for discoloring and decolorizing after 2 days was investigated. (The treatment was performed at 20 ° C.) The results are shown in Table 1. As is clear from Example 1, the pesticide of the present invention has a very high bactericidal activity against red rot fungi as compared with other organic acids, and the time for exterminating aonoori is extremely short.

[0034]

[Table 1]

(Examples 2-8) 0.0 of ketoglutaric acid
5, 0.1, 0.2, 0.3, 0.5, 1.0, 2.0
A W / V% seawater solution was prepared, and a red-rot fungus extermination test, aonomori extermination test, and a damage test on seaweed were performed. The treated water temperature is 20 ° C. The results are shown in Table 2.

・ Red-rot fungus control test
Second, 20 seconds, 30 seconds ... 60 seconds, 2 minutes, 3 minutes ... 10 minutes, 30 minutes) Immersion treatment, washing with seawater, static culture 2
The condition after a day was observed under a microscope to investigate the time for which the red rot fungus could be exterminated.

Aonori eradication test After dipping treatment in ketoglutaric acid seawater solution of each concentration for a certain period of time (1 minute, 2 minutes, 3 minutes ... 30 minutes), washing with seawater, a state after 2 days of static culture investigated. The soaking time after discoloration and decolorization is the time that can remove the aonoori.

Test of degree of damage to seaweed After dipping in ketoglutaric acid seawater solution of each concentration for a certain period of time (1 minute, 2 minutes, 3 minutes ... 30 minutes), it was washed with seawater, and the day after static culture The condition was observed under a microscope to examine the life and death of the seaweed and how long the seaweed was not damaged.

[0039]

[Table 2]

[0040]

INDUSTRIAL APPLICABILITY The pesticide of the present invention has a very strong bactericidal activity against red-rot fungi and vase-like bacteria as compared with other organic acids.
Moreover, the time to exterminate Aonori is extremely short. That is, bacteria such as weeds and red-rot fungi can be exterminated in a short time, which greatly contributes to the seaweed aquaculture industry.

Claims (4)

(57) [Claims] 1. A disinfectant for algae and disease of cultured seaweed, which contains ketoglutaric acid as an active ingredient. 2. A disinfestant for algae in cultured seaweed containing no less than 0.1% by weight / volume of ketoglutaric acid. 3. An aqueous solution containing at least 0.1% by weight / volume of ketoglutaric acid, ammonium nitrate, ammonium chloride, monoammonium phosphate, urea, sodium nitrate, nitric acid as a nitrogen source; 1 potassium phosphate, 1 phosphoric acid as a phosphorus source. A weed alga in cultured seaweed and a disease control agent, which comprises at least one selected from the group consisting of sodium and inositol phosphate 6-phosphate (phytic acid). 4. A citric acid, malic acid, tartaric acid, succinic acid solution containing 0.1% by weight or more of ketoglutaric acid in an aqueous solution.
Gluconic acid, acetic acid, (mono-, di-, tri) chloroacetic acid, lactic acid, maleic acid, fumaric acid, formic acid, hydrochloric acid, phosphoric acid, nitric acid, at least one selected from the group consisting of sulfuric acid, aquaculture laver Weeds and disease control agents.