JP2003252706A - Algicidal fungicide - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an algicidal fungicide capable of carrying out extermination and prophylaxis of miscellaneous algae and disease injuries occurring in culturing laver at a low concentration in a short time by using a treating liquid comprising one or more kinds of organic acids and inorganic acids and an organic acid iron salt. <P>SOLUTION: The algicidal fungicide for culturing the laver consists essentially of the one or more kinds of organic acids and inorganic acids and iron lactate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formulation for exterminating algae such as diatoms and aonori and pathogenic fungi such as red rot fungi, vase-shaped bacteria and adherent bacteria which are generated during seaweed cultivation.

[0002]

2. Description of the Related Art In seaweed cultivation, if algae such as diatoms propagate and adhere to the seaweed leaf body or the seaweed net, the growth of the seaweed may be hindered and eventually killed. Even if diatoms that have no problem in growth adhere to the leaves, if the original algae is used as a product, green dry spots will appear in the black dry seaweed and the commercial value will be reduced. Even if you eat it, it will be bitter and not delicious. In addition, red rot bacteria
If vase-shaped bacteria or adherent bacteria are generated, the seaweed may rot and become completely destroyed. Therefore, in order to control diseases such as red rot and weeds such as diatoms, work such as acid treatment and drying is performed. The work of draining has a drawback that it is hard work and poor in workability, but its effect is small. Although the present method of extermination by acid treatment is more effective than drought, it is not sufficient.

The following treatment agents for seaweed aquaculture have been disclosed so far. Japanese Unexamined Patent Publication (Kokai) No. 50-12125 discloses "Saturated aliphatic monocarboxylic acid having 1 to 4 carbon atoms, saturated or unsaturated dicarboxylic acid having 2 to 4 carbon atoms, glycolic acid, lactic acid, tartaric acid, malic acid, citric acid. And an algicidal agent containing one or more organic carboxylic acids selected from the group consisting of as an active ingredient. JP-A No. 11-286407 describes "a treatment agent for diatom control, which contains lactic acid and / or acetic acid and paraoxybenzoic acid ester". Japanese Examined Patent Publication No. Sho 60-13647 discloses "seaweed aquaculture by exterminating and preventing diseased algae, which is dipped in a treatment solution containing citric acid of 0.3 to 5.0% and pH of 1.0 to 6.0. Law "is described. Japanese Examined Patent Publication No. 60-13648 discloses "a seaweed aquaculture method for controlling 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". Have been described.

The acid treatment is carried out by removing the seaweed nets one by one and immersing them in an acid treatment solution for 10 to 30 minutes, and then resealing the seaweed net. Recently, because the number of farms per aquaculture has increased, the time required for treatment per one has to be shortened, and the acid treatment is called acid treatment, in which the ship is dipped while the seaweed net is fixed and the acid treatment is performed. Methods are being adopted. Since the acid treatment can be performed while the seaweed net is fixed, the acid treatment can be performed in 1/5 to 1/10 of the conventional time. However, the treatment time is shortened to 10 seconds to 5 minutes, and the conventional 0.1 to 0.5 W / V% acid concentration has no effect, and the treatment has been performed at a high concentration of 2 to 10 W / V%. . Still, it has not reached the full effect. The amount of use has increased dramatically, and the problems of cost increase and environmental pollution load are occurring. Recently, the diatom Tabularia that adheres to seaweed, which cannot be removed by acid treatment, has been generated. Acid resistance of disease bacteria also becomes stronger,
The effect is becoming insufficient with acid alone.

Therefore, a method has been reported in which the effect of acid treatment is enhanced by adding an inorganic salt to increase the osmotic pressure (JP-A-9-201180). However, in order to increase the specific gravity to 1.030 or more, the treatment liquid contains several% to 10%.
% Salt must be added. In order to obtain a constant treatment effect, it is necessary to keep the specific gravity of the treatment liquid constant, but it is a fairly difficult technique to add a large amount of salt during a continuous operation to keep its concentration constant. Yes, work efficiency is poor. Generally, prepare about 1000L of treatment liquid and
Since 40 to 100 seaweed nets are treated daily, 20 to 40 L of the acidic treating agent and 200 to 400 kg of salt are required per day to maintain the salt concentration at 5%. Bring 400 kg of salt onto a small acid-treated ship,
It is difficult and extremely laborious to dissolve them so that the specific gravity becomes constant. Since seaweed cultivation is carried out in a highly closed inner bay, if all seaweed farmers perform acid treatment using this method, the specific gravity in seawater will increase and this may lead to an upset of the ecosystem. From the above, it is earnestly desired to develop a treatment agent and a treatment method which are highly safe and have a low concentration and excellent efficacy and workability.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to provide a low concentration of weeds such as diatoms and aonori and pathogenic bacteria such as red-rot fungi, vase-shaped bacteria and adherent bacteria without damaging the seaweed itself. -To provide a treatment agent and a treatment method that can be removed in a short time.

[0007]

[Means for Solving the Problems] As a result of intensive studies to solve the above problems, the use of a treatment liquid containing one or more of organic acids and inorganic acids and iron lactate causes the occurrence of seaweed cultivation. We have found that we can control disinfestation of weeds and diseases with low concentration and in a short time. That is, the present invention is as follows. (1) An algicidal fungicide for seaweed aquaculture, which comprises one or more of organic acids and inorganic acids and iron lactate as main components. (2) The component in the treatment liquid when treating the seaweed net is 0.0
An algaecide fungicide for seaweed cultivation according to (1), which contains an acid of 1 W / V% or more and an organic acid iron of 0.001 W / V% or more. (3) A method for treating seaweed, which comprises immersing the seaweed in the treatment agent according to any one of claims (1) and (2) or spraying the seaweed treatment agent on the seaweed.

As can be seen from the test examples, iron lactate alone does not have the effect of controlling red-rot fungi and diatoms, and acid alone has a weak effect, but the effect of combining acid and organic iron iron is effective against red-rot fungi and diatoms. It can be seen that The red-rot fungus can be exterminated at a low concentration even for a short time within 10 seconds to 10 minutes.

The algicidal fungicide of the present invention is an algicidal fungicide for seaweed cultivation, which contains at least one of organic acids and inorganic acids and organic acid iron as main components. When treating seaweed nets on which seaweed adheres, dissolve or dilute a mixed preparation of acid and iron lactate before use. The preparation may be in a solid form or a liquid form, but a liquid form is preferable since it dissolves in seawater immediately and is easy to use. Separate preparations of acid and organic acid iron can be used by diluting and dissolving.

The acid used in the present invention may be at least one selected from organic acids and inorganic acids. Although there is no limitation on the type of acid, citric acid, malic acid, tartaric acid, lactic acid, fumaric acid, and amber are highly safe and recognized as food additives in view of safety and environmental load. Acid, acetic acid, gluconic acid, adipic acid, phytic acid,
It is preferable to use acids such as ketoglutaric acid, itaconic acid, phosphoric acid, hydrochloric acid, sulfuric acid and nitric acid.

When treating seaweed, the components of the treatment liquid include an acid concentration of 0.01 W / V% or more and an organic acid iron concentration of 0.00
It is preferably 1 W / V% or more. The acid concentration and iron lactate concentration can be adjusted and used according to the desired treatment time. The pH during the treatment is preferably 0.5 to 5.0.

As fertilizer components, amino acids, ammonium chloride, sodium chloride, magnesium chloride, calcium chloride, potassium chloride, sodium nitrate, sodium nitrate, potassium nitrate, sodium phosphate, ammonium phosphate,
Potassium phosphate, ammonium nitrate, magnesium sulfate, sodium sulfate, and sugar can be added.

(Test 1) Lactic acid 0.3 W / V% and iron lactate 0.001, 0.01, 0.1, 0.3, 0.5,
The liquid dissolved in seawater was adjusted to 1.0 W / V%. Nori leaves infected with red rot bacteria at 20 ° C for 30 seconds
After treatment for 1 minute and 5 minutes, it was washed with sterilized seawater. Process 2
After a day, the control effect of the red-rot fungus was examined under a microscope. As a comparative example, lactic acid 0.3 W / V%, iron lactate 0.001, 0.
Solutions of 01, 0.1, 0.3, 0.5 and 1.0 W / V% were prepared. The evaluation criteria of the red rot control effect and the damage degree of seaweed are as follows. The results are shown in Tables 1 and 2. (Red rot control effect) −: No effect +: 20 to 50% control ++: 50 to 80% control +++: 80 to 100% control ++++: 100% control (damage to seaweed) −: No damage +: 20 -50% injury ++: 50-100% injury

[0014]

[Table 1]

[0015]

[Table 2]

(Test 2) A solution prepared by dissolving 0.2 W / V% lactic acid and iron lactate in seawater to 0.1, 0.3, 0.5 and 1.0 W / V% was prepared. The nori leaf cells infected with red rot fungus were treated at 20 ° C. for 30 seconds and 1 minute, and then washed with sterilized seawater. Two days after the treatment, the control effect of the red rot fungus was examined under a microscope. As a comparative example, a 0.2 W / V% lactic acid solution was prepared. The evaluation criteria for the effect of exterminating red rot bacteria and the damage degree of seaweed were the same as in Test 1. The results are shown in Table 3.

[0017]

[Table 3]

(Test 3) A solution prepared by dissolving lactic acid at 0.1 W / V% and iron lactate at 0.1, 0.3, 0.5 and 1.0 W / V% in seawater was prepared. The nori leaf cells infected with red rot fungus were treated at 20 ° C. for 1 minute and 3 minutes, and then washed with sterilized seawater. Two days after the treatment, the control effect of the red rot fungus was examined under a microscope. As a comparative example, a 0.1 W / V% lactic acid solution was prepared. The evaluation criteria for the effect of exterminating red rot bacteria and the damage degree of seaweed were the same as in Test 1. The results are shown in Table 4.

[0019]

[Table 4]

(Test 4) Iron lactate 0.15 W / V% and citric acid 0.01, 0.1, 0.3, 1.0, 2.
A solution dissolved in seawater was prepared so as to have 0 W / V%. The nori leaf cells infected with red rot fungus were treated at 20 ° C. for 10 seconds, 20 seconds, 30 seconds, 1 minute, 3 minutes, 5 minutes, and then washed with sterilized seawater. Two days after the treatment, the control effect of the red rot fungus was examined under a microscope. As a comparative example, citric acid 0.01, 0.1,
Solutions of 0.3, 1.0 and 2.0 W / V% were prepared. The evaluation criteria for the effect of exterminating red rot bacteria and the damage degree of seaweed were the same as in Test 1. The results are shown in Tables 5 and 6.

[0021]

[Table 5]

[0022]

[Table 6]

(Test 5) Iron lactate 0.15 W / V% was supplemented with citric acid, malic acid, tartaric acid, phosphoric acid and hydrochloric acid, respectively.
A solution dissolved in seawater was prepared so as to have a concentration of 3 W / V%. Nori leaves infected with red rot fungus at 20 ℃ for 30 seconds ・ 1 minute ・
After treatment for 5 minutes, it was washed with sterilized seawater. Two days after the treatment, the control effect of the red rot fungus was examined under a microscope. As a comparative example, 0.3 of citric acid, malic acid, tartaric acid, phosphoric acid, hydrochloric acid
A W / V% solution was prepared. The evaluation criteria for the effect of exterminating red rot bacteria and the damage degree of seaweed were the same as in Test 1. The results are shown in Tables 7 and 8.

[0024]

[Table 7]

[0025]

[Table 8]

(Test 6) Citric acid 0.2, 0.5, 1.
A solution prepared by dissolving iron lactate in seawater to 0 W / V% to 0.15 W / V% was prepared. The seaweed leaf bodies to which the diatom (Tabularia) had adhered were treated at 20 ° C. for 5 minutes and 10 minutes, and then washed with sterilized seawater. Two days after the treatment, the diatom exterminating effect was examined under a microscope. As a comparative example, iron lactate 0.
15 W / V% and citric acid 0.2, 0.5, 1.0 W /
A V% solution was prepared. The evaluation criteria for the diatom exterminating effect and the laver damage degree were as follows. The results are shown in Table 9. (Diatom extermination effect)-: No effect +: 20% or less extermination ++: 20-80% extermination +++: 80-100% extermination ++++: 100% extermination (damage to seaweed)-: No injury +: 20-50% Injury ++: 50-100% injury

[0027]

[Table 9]

(Test 7) A solution prepared by dissolving lactic acid 0.3 W / V% and iron lactate in 0.001, 0.01, 0.1 and 1.0 W / V% was prepared. The seaweed leaf bodies to which the diatom (liquophora) had adhered were treated at 20 ° C. for 30 seconds and 1 minute, and then washed with sterilized seawater. Two days after the treatment, the diatom exterminating effect was examined under a microscope. As a comparative example, lactic acid 0.
A solution of 3 W / V% and iron lactate 1.0 W / V% was prepared.
The evaluation criteria for the diatom exterminating effect and laver damage degree were the same as in Test 6. The results are shown in Table 10.

[0029]

[Table 10]

(Test 8) Iron lactate 0.15 W / V% and lactic acid 0.01, 0.1, 0.3, 1.0 and 2.0 W respectively
The liquid dissolved in seawater was adjusted to be / V%. Nori leaves with diatoms (Likumophora) attached at 30
After the treatment for 1 second and 1 minute, it was washed with sterilized seawater. Two days after the treatment, the diatom exterminating effect was examined under a microscope. As a comparative example, lactic acid 0.01, 0.1, 0.3, 1.0, 2.0 W /
A V% solution was prepared. The evaluation criteria for the diatom exterminating effect and laver damage degree were the same as in Test 6. The results are shown in Table 1.
Shown in 1.

[0031]

[Table 11]

[0032]

EFFECTS OF THE INVENTION By using a treatment liquid containing at least one of organic acids and inorganic acids and iron organic acid, it is possible to prevent weeds and diseases that occur during seaweed cultivation at low concentrations and in a short time. I found that I can do it.

Claims (3)

[Claims] 1. An algicidal fungicide for seaweed aquaculture, which comprises, as main components, one or more of organic acids and inorganic acids and iron lactate. 2. The components in the treatment liquid when treating the seaweed net,
The algaecide bactericidal agent for seaweed cultivation according to claim 1, which contains 0.01 W / V% or more of acid and 0.001 W / V% or more of iron lactate. 3. A method for treating seaweed, which comprises immersing the seaweed in the treatment agent according to claim 1 or spraying the seaweed treatment agent onto the seaweed.