JP2002047103A - Agent for controlling green plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling green plants, comprising soaking the green plants adhering to nets and growing on the culture of laver in a treating liquid which is prepared by adding an organic acid or an inorganic acid to a 1 to 15 W/V% inorganic salt solution and has a pH value of 0.5 to 2.5, by which the green plants can be selectively controlled in a short time, and to provide an agent for controlling the green plants. SOLUTION: This method for controlling the green plants, characterized by comprising soaking the green plants adhering to nets and growing on the culture of laver, a Rhodophyta, in a treating liquid which is prepared by adding an organic acid or an inorganic acid to a 1 to 15 W/V% inorganic salt solution and has a pH value of 0. 5 to 2. 5, thereby selectively controlling the green plants. The agent for controlling the green plants.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for selectively controlling a green plant that adheres and grows when cultivating a seaweed that is a red alga plant.

[0002]

2. Description of the Related Art In seaweed cultivation, when a green plant (such as Aosa, Aanaosa, Botauaosa, Sujiaonori, Hiraaonori, Bowaonori) adheres and grows on a nori cultivation net, it prevents the growth of the nori or mixes into the picked product. The price will drop. Therefore, a method for selectively controlling green plants by acid treatment has been used. Organic acids such as citric acid are used, and generally, citric acid 1-1.
A process of 0% for 10 to 20 minutes is performed. Previously, the number of seaweed nets was about 50 cultivation scales, but it has gradually increased and recently has reached 600 to 1000 cultivation scales. Therefore, it is becoming impossible to process all the sheets unless the time required for the acid treatment per sheet is within 3 minutes. The immersion time (contact time) is within 60 seconds.

[0003] In order to exterminate green plants within a treatment time of 60 seconds or less, it is considered sufficient to use an acidic treating agent at a high concentration. The difference is reversed, and the seaweed dies faster before the green plants die. In the acid treatment, a short treatment within 60 seconds cannot be performed. Therefore, development of a method or a pesticide capable of exterminating green plants by a short treatment within 60 seconds has been desired.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to provide:
An object of the present invention is to provide a method and a pesticidal agent for selectively extinguishing green plants without damaging the seaweed of a red algae plant by a short treatment within 0 second.

[0005]

As a result of intensive studies to solve the problems, it has been found that the combined use of an inorganic salt and an acid can control green plants in a short time within 60 seconds without damaging the laver. .

That is, the present invention is as described below. 1) A treatment in which a green plant that adheres and grows during the cultivation of a seaweed, which is a red alga plant, is adjusted to a pH value of 0.5 to 2.5 by adding an organic acid or an inorganic acid to inorganic salts of 1 to 15 W / V%. A method for controlling green plants and a pesticidal agent, comprising immersing in a liquid to selectively control green plants. 2) When inorganic salts are sodium chloride, magnesium chloride,
Ammonium chloride, calcium chloride, potassium chloride, sodium sulfate, magnesium sulfate, ammonium sulfate
Contain at least one of calcium sulfate, potassium sulfate, ammonium nitrate, sodium nitrate, magnesium nitrate, calcium nitrate, potassium nitrate, ferrous sulfate, iron nitrate, ferric chloride, zinc chloride, zinc sulfate and zinc nitrate The method for controlling a green plant and the pesticide according to claim 1, characterized by comprising: 3) The method for controlling a green plant and the controlling agent according to 1 or 2, wherein the contact time with the plant at the time of treatment is 5 to 60 seconds.

[0007] As can be seen from the test examples, it is not possible to control green plants before laver is damaged by acid alone, but by using inorganic salts and organic acids and inorganic acids together, green plants can be controlled before laver is damaged. Can be exterminated. The time for seaweed to start to hurt is long and the time to exterminate green plants is short, so the usable range is widened and extermination can be performed safely.

[0008] As a method of immersion treatment, the seaweed processing may be performed with the laver net fixed using a ark or a submerged boat provided with a processing liquid tank, or the net may be removed and immersed in the processing liquid.

The amount of the inorganic salt used in the present invention is from 1 to
15 W / V%. If it is 1 W / V% or less, green plants cannot be exterminated without damaging the laver, and 15 W / V
If it exceeds V%, the dissolution time will be long and the advantage of short-time treatment will be lost. Particularly preferred is 2
-10 W / V%. Preferred among the inorganic salts used are sodium chloride, magnesium chloride, ammonium chloride, sodium sulfate, magnesium sulfate, ammonium sulfate, calcium sulfate, ferrous sulfate, ferric chloride, potassium nitrate and sodium nitrate. They are,
Because it is a food additive and inexpensive, it is excellent in economy and safety.

The pH value of the treating agent of the present invention is 0.5 to 2.
It is preferably 5. When the pH value is less than 0.5, the treatment cannot be performed because there is no difference between the time for exterminating green plants and the time for the nori to ache, and when the pH value exceeds 2.5, the immersion time (contact time) within 60 seconds is less. This is because green plants cannot be exterminated. Organic acids and inorganic acids added to inorganic salts include citric acid, malic acid, tartaric acid, lactic acid, fumaric acid, succinic acid, acetic acid, gluconic acid, adipine, phytic acid, ketoglutaric acid, phosphoric acid, sulfuric acid, nitric acid, hydrochloric acid Etc. can be used.

Test Example 1 The treatment agents shown in Table 1 were prepared,
The laver net to which Hira-aonori adheres is kept for a certain time (10.20
(30, 40, 50, 60 seconds) After immersion treatment, the cells were washed with seawater, and then allowed to stand still for one day and night. As a comparative example, lactic acid 1.
0%, 0.5%, 0.3%, salt (sodium chloride) 1
5% was adjusted and used. Table 1 shows the results.

[0012]

[Table 1]

(Test Example 2) The treatment agents shown in Table 2 were prepared,
The laver net to which Hira-aonori adheres is kept for a certain time (10.20
(30, 40, 50, 60 seconds) After immersion treatment, the cells were washed with seawater, and then allowed to stand still for one day and night. As a comparative example, lactic acid 1.
0%, 0.5%, 0.3% and 10% ammonium sulfate were adjusted and used. Table 2 shows the results.

[0014]

[Table 2]

(Test Example 3) The treatment agents shown in Table 3 were prepared,
The laver net to which Hira-aonori is attached is kept for a certain period of time (10, 2
(0, 30,..., 300 seconds), immersion treatment, washing with seawater, and culturing by standing for one day and night. Table 3 shows the results. TAKARA No. 1: Acid treatment agent manufactured by Daiichi Seimi Co., Ltd.

[0016]

[Table 3]

Test Example 4 The treatment agents shown in Table 4 were prepared,
The laver net to which Hira-aonori is attached is kept for a certain period of time (10, 2
(0, 30,..., 60 seconds), after immersion treatment, washed with seawater, and allowed to stand still for one day and night. Table 4 shows the results. Grogen: Daiichi Seiki Co., Ltd. acid treatment agent

[0018]

[Table 4]

[0019]

According to the present invention, a green plant that adheres and grows during cultivation of a seaweed, a red algae plant, is adjusted to a pH value of 0.5 to 2.5 by adding an organic acid or an inorganic acid to inorganic salts of 1 to 15 W / V%. By immersion treatment with the adjusted pesticide, green plants can be selectively exterminated.

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Claims (3)

[Claims] 1. A green plant adherently growing during cultivation of a seaweed, a red algae plant, is adjusted to a pH value of 0.5 to 2.5 by adding an organic acid or an inorganic acid to inorganic salts of 1 to 15 W / V%. A method for controlling a green plant and a pesticidal agent, wherein the method comprises immersion treatment with a prepared treatment solution to selectively control green plants. 2. The inorganic salts are sodium chloride, magnesium chloride, ammonium chloride, calcium chloride, potassium chloride, sodium sulfate, magnesium sulfate, ammonium sulfate, calcium sulfate, potassium sulfate, ammonium nitrate, sodium nitrate, magnesium nitrate, calcium nitrate, potassium nitrate. 2. A method and a pesticide for controlling green plants according to claim 1, comprising at least one of iron sulfate, iron nitrate, iron chloride, zinc chloride, zinc sulfate and zinc nitrate. 3. The contact time with a plant at the time of treatment is 5-60.
The method for controlling a green plant according to claim 1 or 2, wherein the control agent is a second.