JP3488648B2 - Diatom and disease control agent for seaweed cultivation and its control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method or an exterminating agent for exterminating diatoms and diseases which occur in a seaweed cultivation process.

[0002]

2. Description of the Related Art In seaweed aquaculture, a method of immersing in an acidic liquid has been adopted for the control of algae and the control of bacteria such as red rot. Citric acid is mainly used as the acid. After seeding, before the seaweed can be harvested, the seaweed grows faster than the seaweed, so that the seaweed mixes and becomes longer than the seaweed, which hinders the growth of the seaweed. Therefore, acid treatment is carried out before the start of plucking to exterminate the aonori. That is,
For the purpose of exterminating Aonori, 1 before the start of plucking
Only once.

Another purpose of acid treatment is prevention and control of red rot disease. Red rot is said to be a parasite of fungi of the genus Pythium and related species, and grows mainly at a water temperature of around 15 ° C. Nori culture is carried out at a water temperature of 22 to 8 ° C, and is exterminated by acid treatment at the time when red rot of about 15 ° C occurs. However, when a large amount of red rot occurs, the acid treatment has no effect, and it often spoils to end the fishing season.

[0004] In seaweed aquaculture, diatom is one that causes great damage to seaweed production over the entire fishing season. Various diatoms occur all the time during the fishing season and adhere to the seaweed net or seaweed to suppress the growth of seaweed. When it is terrible, it may not be possible to produce seaweed. Although a little diatom can be exterminated by the acid treatment, its effect is insufficient. For diatoms that adhere to seaweed or seaweed nets, Lichmophora (L
icmophora), tabellaria
ia), Synedra, Basilaria (B)
acilaria), Nichia (Nitzchi
a), Navicula, Merosilla (M)
elosira), Achnanthe (Achnanthe)
s) etc. Among these, the diatom called Taberaria niche is completely ineffective in acid treatment, and if a large amount of this diatom is produced, nori can not be produced. Therefore, there is a strong demand for the development of a drug that can exterminate diatoms such as Taberaria niche and that is highly effective against various diatoms.

[0005]

[Means for Solving the Problems] As a result of intensive studies to solve the above-mentioned problems, it was found that pH containing iodine compounds
It was found that diatom and disease can be eliminated by dipping the seaweed culture net in an acidic treatment solution of 3.0 or less.

The diatom and disease control agent for cultivating seaweed of the present invention and its control method are as follows. (1) At least one iodine compound selected from potassium iodide, calcium iodide, sodium iodide, iodic acid, potassium iodate, sodium iodate, potassium hydrogen iodate, iodoacetic acid and sodium iodoacetate, and an acid A disinfectant for diatom and disease for seaweed aquaculture, which comprises a treatment liquid containing the above and having a pH adjusted to 3.0 or less. (2) acid is malic acid, citric acid, lactic acid, acetic acid, fumaric acid, gluconic acid, maleic acid, malonic acid, formic acid, propionic acid, tartaric acid, acrylic acid, phytic acid, itaconic acid, ketoglutaric acid, glutaric acid, The diatom and disease control agent for seaweed cultivation according to (1) above, which is one or more selected from the group consisting of itaconic acid, methanesulfonic acid, adipic acid, sulfuric acid, nitric acid, hydrochloric acid and phosphoric acid. (3) To a liquid containing at least one iodine compound selected from potassium iodide, calcium iodide, sodium iodide, iodic acid, potassium iodate, sodium iodate, potassium hydrogen iodate, iodoacetic acid and sodium iodoacetate A method for controlling diatoms and diseases for seaweed cultivation, which comprises dipping a seaweed cultivation net in a treatment solution in which an acid is added to adjust the pH to 3.0 or less. (4) acid is malic acid, citric acid, lactic acid, acetic acid, fumaric acid, gluconic acid, maleic acid, malonic acid, formic acid, propionic acid, tartaric acid, acrylic acid, phytic acid, itaconic acid, ketoglutaric acid, glutaric acid, The method for controlling diatom and disease for seaweed cultivation according to (3) above, which is one or more selected from the group consisting of itaconic acid, methanesulfonic acid, adipic acid, sulfuric acid, nitric acid, hydrochloric acid and phosphoric acid.

As can be seen from Test 1, taberaria cannot be exterminated by treatment with potassium iodide alone or a treatment liquid of an acidic treatment agent having a pH of 1.6, but potassium iodide and an acid-containing pH of 1.5-1. By treating with the treatment liquid of No. 6, diatom (Taberaria) without damaging seaweed
Was able to get rid of. From Test 1 and Test 4, it was found that diatom can be exterminated by the combined use of an iodine compound and an acid. Test 2 shows that diatoms can be exterminated by adjusting the pH of the liquid containing the iodine compound to 3 or less, and no effect is exhibited at 4 or more. The test for red-rot fungus extermination in Test 3 was carried out by using an iodine compound in combination with an acidic treating agent.
It shows that the red-rot fungus can be eliminated in a shorter time. From the above, by treating with a treatment liquid containing an iodine compound and having a pH of 3.0 or less, it is possible to eliminate diatoms that could not be eliminated by the acidic treatment agent,
Moreover, it was found that the effect of exterminating the red-rot fungus can be enhanced.

(Test 1) Potassium iodide was added to and dissolved in a 100-fold diluted seawater of an acidic treatment agent "Dash" (manufactured by Fuso Chemical Industry Co., Ltd.) to prepare treatment solutions having various concentrations. As a control, a test section containing a 100-fold diluted “dash” alone and potassium iodide alone was provided. At the treated water temperature of 10 ° C, the seaweed leaf bodies to which the diatom (Taberaria) adheres are kept for a certain time (10, 20, 30, 40, 50, 60, 90, 12
0, 150, 180, 210, 240, 270, 300
Second) Immersion treatment was performed. Thereafter, the plate was washed with seawater and statically cultured in a petri dish. After irradiating with sunlight for 1 hour, the control effect of diatom was observed under a microscope. The decolorized diatom was judged to be dead. The results are shown in Table 1, and the composition of dashes is shown in Table 2.

[0009]

[Table 1]

[0010]

[Table 2]

(Test 2) An acidic treating agent "Dash" was added to a seawater solution containing 100 ppm of potassium iodide to adjust pH values to 1.5, 2.0, 2.5, 3.0, 4.0, and 5. Adjusted to 0.0. Except for the above, a diatom (Tabelaria) extermination test was conducted in the same manner as in Test 1. The results are shown in Table 3.

[0012]

[Table 3]

(Test 3) Using various iodine compounds shown below, a diatom (Nicha) extermination test was conducted in the same manner as in Test 1. The results are shown in Table 4 .

[0014]

[Table 4]

[0015]

(Test 4) Acid treatment agent "Takara No. 1" (manufactured by Daiichi Seimitsu Co., Ltd.) 10
Potassium iodide was added and dissolved in a 0-fold or 150-fold diluted solution to adjust the concentration to 200 ppm or 400 ppm. Nori leaves infected with red rot fungus at treated water temperature of 10 ℃ for a certain period of time (10, 20, 30, 40, 50, 60,
90, 120, 150, 180, 210, 240, 27
Immersion treatment was performed. Then, the plate was washed with seawater and statically cultured in a petri dish. After 2 days, the control effect of the red-rot fungus was confirmed under a microscope. The results are shown in Table 5 .

[0017]

[Table 5]

[0018]

According to the present invention, a treatment agent containing an iodine compound and an acid and having a pH adjusted to 3.0 or less,
By treating the seaweed aquaculture net, various diatoms that cannot be removed by conventional acid treatment agents can be removed, and the effect of removing diseases such as red rot can be enhanced. Disinfectants for diatom and disease and methods for exterminating the same are provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-10509 (JP, A) JP-A-54-160680 (JP, A) JP-A-60-224607 (JP, A) JP-A-9- 278609 (JP, A) JP 10-243751 (JP, A) JP 63-68508 (JP, A) JP 56-77209 (JP, A) JP 48-83654 (JP, A) JP-A-58-32806 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01N 59/12 A01G 33/02 A01N 25/02 CA (STN) REGISTRY (STN) JOIS (JICST File)

Claims (4)

(57) [Claims] 1. At least one iodine compound selected from potassium iodide, calcium iodide, sodium iodide, iodic acid, potassium iodate, sodium iodate, potassium hydrogen iodate, iodoacetic acid and sodium iodoacetate, A disinfectant for diatom and disease for seaweed aquaculture, comprising a treatment liquid containing an acid and having a pH adjusted to 3.0 or less. 2. The acid is malic acid, citric acid, lactic acid, acetic acid, fumaric acid, gluconic acid, maleic acid, malonic acid, formic acid, propionic acid, tartaric acid, acrylic acid, phytic acid,
The seaweed aquaculture according to claim 1, which is one or more selected from the group consisting of itaconic acid, ketoglutaric acid, glutaric acid, itaconic acid, methanesulfonic acid, adipic acid, sulfuric acid, nitric acid, hydrochloric acid and phosphoric acid. Disinfectant for diatom and disease. 3. At least one iodine compound selected from potassium iodide, calcium iodide, sodium iodide, iodic acid, potassium iodate, sodium iodate, potassium hydrogen iodate, iodoacetic acid and sodium iodoacetate. A method for controlling diatoms and diseases for seaweed cultivation, which comprises dipping a seaweed cultivation net in a treatment solution in which an acid is added to the solution to adjust the pH to 3.0 or less. 4. The acid is malic acid, citric acid, lactic acid, acetic acid, fumaric acid, gluconic acid, maleic acid, malonic acid, formic acid, propionic acid, tartaric acid, acrylic acid, phytic acid,
The seaweed aquaculture according to claim 3, which is one or more selected from the group consisting of itaconic acid, ketoglutaric acid, glutaric acid, itaconic acid, methanesulfonic acid, adipic acid, sulfuric acid, nitric acid, hydrochloric acid and phosphoric acid. How to get rid of diatom and disease.