JPH07184491A - Method for culturing laver and agent for controlling brown rod microbe - Google Patents

Abstract

PURPOSE:To control brown rod microbes in a short time without relating to laver itself by dipping a laver-culturing net in a treating solution produced by adding a lactic acid salt and/or an itaconic acid salt to an acid-containing solution. CONSTITUTION:0.05-0.3wt.% of a lactic acid salt and/or an itaconic acid salt is added to a solution containing approximately 0.01-3wt.% of an organic acid or an inorganic acid to prepare a brown rod microbe-controlling agent. When a laver-culturing net is dipped in the controlling agent, the brown rod microbes can be controlled within approximately 1.5min, and a laver disease caused by the brown rod microbes can be controlled and prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment method for exterminating and preventing a disease caused in seaweed aquaculture in a short time and an exterminating agent which enables a short time treatment.

[0002]

2. Description of the Related Art In the cultivation of seaweed, when red-rot fungi are generated, the quality of seaweed is deteriorated, and when the seaweed becomes severe, there is a risk of production being completely lost. Generally, in seaweed aquaculture, a draining operation is performed as a method for preventing and controlling disease. This is a method of removing the seaweed net from the seawater once and drying it, but this method is not very effective in taking a lot of labor and time. As another method, there is a method of eradicating the red-rot fungus by immersion treatment in an organic acid solution such as citric acid and malic acid. A 1-2% solution of citric acid has been treated for 5-10 minutes. These have the drawback that it takes too long to control the red-rot fungus. The disease called red rot is
Nori leaves grow rapidly, and when they can finally be harvested, they rapidly occur, and they spread to all fishing grounds within a few days, causing the leaves to die and run out.

The following patents are disclosed for controlling red rot fungi. Japanese Examined Japanese Patent Sho 60-13647
Japanese Patent Laid-Open Publication No. 2003-242242 contains citric acid in an amount of 0.3 to 5.0% by weight, p
A seaweed aquaculture method by controlling and preventing weeds and diseases by immersing it in a treatment solution having H of 1.0 to 6.0 is described. Japanese Patent Publication No. 60-13648 describes a seaweed aquaculture method for controlling and preventing weeds and diseases by adding inorganic acids such as hydrochloric acid, nitric acid, sulfuric acid and phosphoric acid to adjust the pH to 1.0 to 4.0. There is.

Japanese 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 No. 57-8722 discloses a seaweed cultivation method in which a seaweed net is treated with a treatment liquid containing phosphoric acid or a salt thereof to remove or prevent diseases such as weeds and red rot. There is.

As described above, a seawater solution of an organic acid and / or an inorganic acid is effective for controlling red rot fungi, and in particular, so-called weeds of diatoms such as sea lettuce, aonomori and other diatoms. It is also important to ensure the quality of seaweed, so this algae control is also performed, but this algae control does not affect the pH.
Is required to be 4 or less, and the above-mentioned acid is also used for controlling both of them at the same time.

The organic or inorganic acids include citric acid, malic acid, phytic acid, acetic acid, tartaric acid, succinic acid, gluconic acid, chloroacetic acid, formic acid, ketoglutaric acid, maleic acid, fumaric acid, hydrochloric acid, phosphoric acid, nitric acid. , And sulfuric acid.

Although the above-mentioned documents and the like also describe salts of phytic acid and phosphoric acid, as shown in Comparative Examples below, not only the salt has a very small effect on the control of red rot fungus,
Not all of the above acid salts are effective.

[0008] Since red rot fungi have a high infectivity when they are generated, they must be quickly treated to completely kill them.
Even if 99% of the red-rot fungi in the seaweed leaves were killed, the remaining 1% of the red-rot fungi would propagate rapidly, and the leaves would turn red the next day. I will end up. Therefore, 100% must be removed. Even if it can be completely exterminated, infection from the sea will occur immediately,
If it is not treated every 2 to 6 days, the seaweed will be destroyed.

Nori producers average 100 to 200
Since nori seaweed nets are collected and the current treatment agent requires a treatment time of 5 minutes or more per net, 30 to 40 nets can be treated in about 8 hours that can be worked in one day. Is. Therefore, as the spread of red-rot fungi becomes worse, the control of red-rot fungi is delayed, and the seaweed production is no longer spoiled and the production of seaweed ends. Therefore, development of a treating agent or a culture method capable of controlling red rot bacteria in a shorter time has been earnestly desired.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a repellent and a method for cultivating a red rot fungus in a short time without damaging the seaweed itself.

[0011]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to solve the above-mentioned problems, and as a result, it was found that an acid salt alone has little effect on the control of red-rot fungi. However, the present invention has been completed by discovering that a specific salt, which is used for the control of ordinary red-rot fungi, can be added to an organic acid or an inorganic acid to significantly reduce the time for controlling red-rot fungi. .

That is, the present invention is as follows. (1) A lactate and / or an itaconic acid salt is mixed with a solution containing at least one selected from the group consisting of organic acids and inorganic acids, and the seaweed cultivation net is subjected to a dip treatment to treat the disease A seaweed cultivation method characterized by extermination and prevention.

(2) A red rot fungicide comprising a lactate and / or an itaconic acid salt mixed with at least one selected from the group consisting of organic acids and inorganic acids.

(3) A lactate salt and / or an itaconic acid salt is added in an amount of 0.05 to 0.1% to a 0.01 to 3% by weight solution of at least one selected from the group consisting of organic acids and inorganic acids.
A red-rot fungicide extinguishing agent containing 3% by weight.

At present, commercially available acid treating agents include
Green Cut No. 6 which is an aqueous solution of 15% by weight citric acid as a stock solution, 25% by weight phytic acid 10% by weight, malic acid 7.7% by weight, citric acid 7.7% by weight, 50% gluconic acid 5.0% by weight Grogen is known. These stock solutions are used by diluting them in an amount of 0.05 to 3% by weight, and, as can be seen from the name of Green Cut, they also serve to control weeds and other algae.

This Growgen or green cut 6
No. 2, it takes at least 2.5 minutes and 4 minutes to completely remove red rot, respectively, but soak the seaweed leaf infected with red rot in the treatment solution containing lactate or itaconic acid salt. As a result, the processing time could be shortened to 1.5 minutes.

Even if citrate or malate is added, the bactericidal effect is not enhanced, and the sterilizing power is decreased as the amount of citrate or malate is increased. It was found that only lactate and itaconate enhance the bactericidal activity. Of course, the lactate and itaconic acid salt alone cannot exterminate the red-rot fungus even if treated. As the concentration of the treatment liquid of the organic acid and / or the inorganic acid,
It may be a 0.01 to 3% by weight solution, which is a normal acid concentration, and the concentration of lactate and / or itaconic acid salt may be:
As is clear from the shortest time for complete extermination of Examples 1 to 6 in Table 1, when the amount is less than 0.05 W / W%, the effect of shortening the time becomes small, and even when the concentration is more than 0.3 W / W%, the effect is high. Is saturated, and the effect of further shortening time is small.

As the lactate or itaconic acid salt used in the present invention, lactic acid or itaconic acid sodium salt, potassium salt, magnesium salt, calcium salt and the like can be used.
Organic or inorganic acids used include citric acid, malic acid, phytic acid, acetic acid, tartaric acid, succinic acid, gluconic acid, chloroacetic acid, formic acid, ketoglutaric acid, maleic acid, fumaric acid, hydrochloric acid, phosphoric acid, nitric acid, Examples include sulfuric acid.

According to the aquaculture method of the present invention, the red rot fungus can be exterminated in a short time, the workability is improved, the number and number of seaweed nets that can be treated are increased, and the damage caused by the red rot fungus is greatly reduced. be able to.

[0020]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. The seaweed leaves infected with red rot fungus were immersed in a seawater solution prepared by treating the treatment solutions shown in Table 1 for a certain period of time, then taken out, washed with seawater, and statically cultured, and the state after 2 days was observed under a microscope. Then, the control effect of red rot fungus was investigated. Treated water salt is 20 ° C.

The results are shown in Table 1 as ◯, Δ, and ×. The evaluation criteria are as follows: ○: Completely eradicated △: Sufficiently suppressed, slight red-rot fungi are observed. ×: Red rot fungus has spread considerably. However, Green Cut No. 6: 15 W / W citric acid solution,
Made by Mitsubishi Petrochemical Co., Ltd. Grogen: Phytic acid (25%) 10%, Malic acid 7.7%, Citric acid 7.7%, Gluconic acid (50%)
5.0%, manufactured by Daiichi Seimitsu Co., Ltd.

[0022]

[Table 1]

[Table 2]

[0023]

[Effects of the Invention] By adding lactate and / or itaconic acid salt, the treatment time can be significantly shortened and the workability can be improved as compared with the case of using organic or inorganic acid alone as a treatment agent. The number and number of seaweed nets that can be processed are increased, and the damage caused by red rot fungi can be greatly reduced.

Claims (3)

[Claims] 1. Lactate and / or itaconic acid salt is at least one selected from the group consisting of organic acids and inorganic acids.
A seaweed cultivation method characterized by exterminating and preventing disease by dipping the seaweed cultivation net in a solution containing seeds. 2. A red rot fungicide comprising a lactate and / or an itaconic acid salt mixed with at least one selected from the group consisting of organic acids and inorganic acids. 3. A 0.01 to 3 wt% solution of at least one selected from the group consisting of organic acids and inorganic acids,
A red-rot fungicide against which lactate and / or itaconic acid salt is blended in an amount of 0.05 to 0.3% by weight.