JP3643345B2

JP3643345B2 - Cultured laver treatment agent, cultured laver treatment solution, and cultured laver treatment method

Info

Publication number: JP3643345B2
Application number: JP2002023236A
Authority: JP
Inventors: 英一杉浦; 隆一松永; 宏坪田; 春周赤澤
Original assignee: Fuso Chemical Co Ltd
Current assignee: Fuso Chemical Co Ltd
Priority date: 2002-01-31
Filing date: 2002-01-31
Publication date: 2005-04-27
Anticipated expiration: 2022-01-31
Also published as: JP2003226605A

Description

【０００１】
【発明の属する技術分野】
本発明は養殖海苔用処理剤並びに養殖海苔用処理液及び養殖海苔の処理方法に関し、その目的は、処理液のｐＨ値が高い場合でも、赤腐れ病菌、白腐れ病菌、壺状菌などの養殖海苔の病害や珪藻などの雑藻を駆除することができ、周囲の環境や海苔葉体に悪影響を与えることがない養殖海苔用処理剤並びに養殖海苔用処理液及び養殖海苔の処理方法を提供することにある。
【０００２】
【従来の技術】
海苔の養殖には、海苔葉体や海苔網にアオノリ、アオサ、珪藻などの雑藻や細菌類が付着すると、海苔葉体の成長や胞子の付着を妨げたり、また白腐れ病、赤腐れ病、壺状菌病などの病害が発症したりして、海苔の養殖に甚大な被害を与える。
【０００３】
従来、このような雑藻類を駆除して病害の発症を予防するための海苔用処理剤及び処理方法に関する技術としては、例えば、特公昭５６−１２６０１号公報、特公昭６０−３１４５１号公報、特開平９−２０１１８０号公報に記載のものが知られている。
【０００４】
特公昭５６−１２６０１号公報には、炭素数１〜４の飽和脂肪族モノカルボン酸、炭素数２〜４の飽和又は不飽和ジカルボン酸、グリコール酸、乳酸、酒石酸、リンゴ酸、クエン酸のうちの一種以上の有機カルボン酸を有効成分とする海苔用処理剤が記載されている。
特公昭６０−３１４５１号公報には、海苔や海苔が付着した養殖具を、有機酸を０．３〜１５重量％含み、且つｐＨが１．０〜４．０に調整された処理液に浸漬させることにより、雑藻、病害の駆除、予防を行う海苔の養殖方法が記載されている。
特開平９−２０１１８０号公報には、海水に無機塩類と酸とを加えて、比重を１．００１〜１．０６０に調整し、且つｐＨを０．５〜３．０に調整した海苔用処理剤が記載されている。
【０００５】
【発明が解決しようとする課題】
上記の海苔用処理剤や処理方法は、いずれも有効成分として有機酸を含有するとともに、ｐＨを酸性域に調整した酸処理剤を使用する技術である。
これの酸処理剤は、ｐＨ値が低いほど、優れた効果が得られるために、通常の場合、ｐＨ１．５〜１．８程度に調整されて使用される。しかしながら、酸処理剤は、このように低いｐＨ値に調整されて使用されるために、周囲の環境に与える影響が極めて大きかった。また海苔葉体に与える影響も大きく、場合によっては海苔葉体の成長を阻害してしまう場合があった。
また酸処理剤のｐＨ値を高くすれば、周囲の環境や海苔葉体に対する影響を軽減することができるが、珪藻などの駆除効果が低下してしまうという問題があった。
【０００６】
本発明は、処理液のｐＨ値が高い場合でも、赤腐れ病菌、白腐れ病菌、壺状菌などの養殖海苔の病害や珪藻などの雑藻を駆除することができ、周囲の環境や海苔葉体に悪影響を与えることがない養殖海苔用処理剤並びに養殖海苔用処理液及び養殖海苔の処理方法を提供することにある。
【０００７】
【課題を解決するための手段】
即ち、請求項１に係る発明は、有効成分として、乳酸を４０〜５２重量％、酢酸を３重量％以上９重量％未満含有してなることを特徴とする赤腐れ菌及び珪藻駆除用の養殖海苔用処理剤に関する。
請求項２に係る発明は、有効成分として、乳酸を９〜１８重量％、酢酸を２５〜３６重量％含有してなることを特徴とする赤腐れ菌及び珪藻駆除用の養殖海苔用処理剤に関する。
請求項３に係る発明は、燐酸を１０重量％未満含有してなることを特徴とする請求項１又は２に記載の赤腐れ菌及び珪藻駆除用の養殖海苔用処理剤に関する。
請求項４に係る発明は、有効成分として、乳酸を０．４０〜０．５２重量％、酢酸を０．０３重量％以上０．０９重量％未満含有してなり、ｐＨが２．０〜２．５に調整されてなることを特徴とする赤腐れ菌及び珪藻駆除用の養殖海苔用処理液に関する。
請求項５に係る発明は、有効成分として、乳酸を０．０９〜０．１８重量％、酢酸を０．２５〜０．３６重量％含有してなり、ｐＨが２．０〜２．５に調整されてなることを特徴とする赤腐れ菌及び珪藻駆除用の養殖海苔用処理液に関する。
請求項６に係る発明は、０．１重量％未満の燐酸を含有してなることを特徴とする請求項４又は５に記載の赤腐れ菌及び珪藻駆除用の養殖海苔用処理液に関する。
請求項７に係る発明は、前記請求項１乃至３のいずれかに記載の養殖海苔用処理剤を、海水で希釈してなり、ｐＨが２．０〜２．５に調整されてなることを特徴とする赤腐れ菌及び珪藻駆除用の養殖海苔用処理液に関する。
請求項８に係る発明は、前記請求項４乃至７のいずれかに記載の養殖海苔用処理液に、海苔又は海苔が付着した海苔網などの養殖具を所要時間接触させて、赤腐れ菌及び珪藻を駆除することを特徴とする養殖海苔の処理方法に関する。
【０００８】
【発明の実施の形態】
以下、本発明に係る養殖海苔用処理剤並びに養殖海苔用処理液及び養殖海苔の処理方法について説明する。
まず、本発明の第一実施形態に係る養殖海苔用処理剤並びに養殖海苔用処理液及び養殖海苔の処理方法について説明する。本発明の第一実施形態に係る養殖海苔用処理剤（以下、単に処理剤という。）は有効成分として乳酸及び酢酸を含有する。乳酸の含有量は、処理剤全量中、４０〜５２重量％とされる。また酢酸の含有量は、処理剤全量中、３〜９重量％未満とされる。この理由は、短時間処理剤として使用した場合、ｐＨ２．０以上でも珪藻や病害の駆除、予防に十分な効果を発揮するとともに、従来の配合になく海苔葉体への影響が低いからである。
【０００９】
また、本発明の第一実施形態に係る処理剤は、燐酸を含有することができる。燐酸を含有する理由は、処理剤を実際に使用する場合、後述するように海水で希釈して養殖海苔用処理液として使用するわけであるが、この際の養殖海苔用処理液のｐＨを調整する目的に配合される。また燐酸を含有することで、高いｐＨ値でも養殖海苔の病害や雑藻を駆除、予防することができる、優れた効果が得られるからである。さらに燐酸を含有することで、海苔葉体に悪影響を与えることがなく、安全性の高い処理剤とすることができる。
燐酸の含有量は特に限定されないが、処理剤全量中、１０重量％未満、好ましくは５〜１０重量％未満とされる。この理由は、燐酸の含有量が１０重量％を超える場合、周囲の環境に悪影響を与える場合があるため、好ましくないからである。
【００１０】
さらに本発明の第一実施形態に係る処理剤には、通常の処理剤に含有される、水、栄養成分、無機酸、他の有機酸等を適宜任意に配合することができる。
【００１１】
以上説明した本発明の第一実施形態に係る処理剤は、実際の海苔処理の際には、必要に応じて海水等で希釈されて、本発明の第一実施形態に係る養殖海苔用処理液（以下、単に処理液という。）として使用される。処理剤の希釈は、処理方法或いは海水の温度等に応じて適宜調整すればよく、通常の場合、有効成分である乳酸の含有量が、処理液全量中、０．４〜０．５２重量％となるように、海水等で希釈すればよい。またこのときの酢酸の含有量は、処理液全量中、０．０３〜０．０９重量％未満とされる。この理由は、短時間処理剤として使用した場合、ｐH２．０以上でも珪藻や病害の駆除、予防に十分な効果を発揮するとともに、従来の配合になく海苔葉体への影響が低いからである。
【００１２】
また燐酸を含有する場合、燐酸の含有量は、処理液全量中、０．１０重量％未満とされる。この理由は、０．１０重量％を超える場合、周囲の環境に悪影響を与える場合があるために好ましくないからである。
【００１３】
さらに本発明の第一実施形態に係る処理液のｐＨは特に限定されないが、好ましくは２．０〜２．５に調整される。この理由はｐＨが２．０未満の場合、海苔葉体や周囲の環境に悪影響を与える場合があるために、また２．５を超える場合、養殖海苔の病害や珪藻などの雑藻を駆除、予防する十分な効果が得られないために、いずれの場合も好ましくないからである。
【００１４】
以上説明した本発明の第一実施形態に係る処理液を使用して養殖海苔を処理する方法は、処理液に、海苔又は海苔が付着した海苔網などの養殖具を所要時間接触させる従来と同様の処理方法で構わないが、特にモグリ船などのように、海苔の養殖網の下に船を潜らせて、処理液に網を素通ししながら比較的短時間で処理する方法が好ましい。モグリ船等による処理時間は３０〜１２０秒間程度、通常の場合、３０〜９０秒間程度である。さらに、一部の地域で行われている、小型の船を用いた素通し処理といわれる方法でもかまわない。これは処理液を船内の処理液槽等の容器に収容し、海苔の養殖網の下に船を潜らせて処理液に海苔の養殖網を浸漬しながら通過させる処理方法である。この素通し処理の場合、処理時間は１０〜２０秒程度である。
【００１５】
以上説明した本発明の第一実施形態に係る処理剤及び処理液は、ｐH２．０以上であっても養殖海苔の病害や珪藻などの雑藻類を駆除、予防する十分な効果が得られ、海苔葉体への影響は小さく使用しやすいものである。
【００１６】
次に、本発明の第二実施形態に係る養殖海苔用処理剤並びに養殖海苔用処理液及び養殖海苔の処理方法について説明する。本発明の第二実施形態が上述した第一実施形態と異なる点は、有効成分である乳酸及び酢酸の含有量である。
【００１７】
有効成分である乳酸の含有量は、処理剤全量中、９〜１８重量％、酢酸の含有量は、処理剤全量中、２５〜３６重量％とされる。この理由は、乳酸が９重量％未満、酢酸が２５重量％以下では、養殖海苔の病害や雑藻を駆除することができる十分な効果が得られず、乳酸が１８重量％超、酢酸が３６重量％を超えて含有すると、効果の向上のわりに海苔葉体への悪影響が強くなるため、いずれの場合も好ましくないからである。
【００１８】
そして、前述した本発明の第二実施形態に係る処理剤を海水で希釈することで、本発明の第二実施形態に係る処理液とされる。第二実施形態に係る処理液の乳酸の含有量は、処理液全量中、０．０９重量％以上０．１８重量％未満、酢酸の含有量は処理液全量中、０．２５〜０．３６重量％とされる。この理由は、乳酸が０．０９重量％未満、酢酸が０．２５重量％以下では、養殖海苔の病害や雑藻を駆除することができる十分な効果が得られず、乳酸が０．１８重量％以上、酢酸が０．３６重量％を超えて含有すると、効果の向上のわりに海苔葉体への悪影響が強くなるため、いずれの場合も好ましくないからである。
【００１９】
以上詳述した本発明の第二実施形態に係る処理剤及び処理液は、ｐH２．０以上であっても養殖海苔の病害や珪藻などの雑藻類を駆除、予防する効果が高く、その効果のわりには海苔葉体への影響は小さいものである。
尚、以上説明した以外の構成は、前述した第一実施形態と同様であり説明を省略する。
【００２０】
【実施例】
以下、本発明を実施例に基づき説明するが、本発明はこれらの実施例に何ら限定されるものではない。尚、配合量は重量％である。
【００２１】
＜試料の調製＞
人工海水に、後記表１〜２に示す処理剤成分を添加して溶解混合し、各試験区の海苔用処理液を調製した。尚、ｐＨは塩酸及び水酸化ナトリウムで表に記載の通りに調整した。
【００２２】
＜試験例１＞
上記調製した各処理液で、赤腐れ羅病葉体を１分間処理後、海水で十分に洗浄してから、海水中で二日間静置培養後、検体を顕微鏡で観察し、赤腐れ病の駆除効果を判定した。処理しない葉体も対照として同時に試験した。
尚、赤腐れ病への効果の判定は以下のように表記した。表記符号「−」は対照とほぼ同様に病班が拡大、「＋」は羅病細胞が部分的に白化し、新たな感染部分がかなりある、「＋＋」は羅病細胞が部分的に白化し、新たな感染部分が僅かにある、「＋＋＋」は羅病細胞が部分的に白化し、新たな感染部分がない。
また海苔葉体への影響を、エリスロシン染色による海苔葉体の染色率と検鏡で観察した芽の傷み具合で判定した。海苔葉体の染色率の判定は、「−」〜「＋＋＋」の範囲で示し、「−」は殆ど染色されない、「±」は染色部分１０％以下、「＋」は染色部分１０〜４０％、「＋＋」は染色部分４０〜９０％、「＋＋＋」は染色部分９０〜１００％とし、芽の傷み具合の判定は、「○：傷みなし」、「△：やや傷みなし」、「×：傷みあり」とした。結果を表１及び２に記載する。
【００２３】
＜試験例２＞
上記調製した各処理液で、珪藻が付着した海苔葉体を１分間処理後、海水で十分に洗浄してから、新たな海水に戻し、珪藻の駆除効果を判定した。珪藻の駆除効果の判定は、エリスロシン染色による珪藻の染色率を「−」〜「＋＋＋」の範囲で示し、「−」は殆ど染色されない、「±」は染色部分１０％以下、「＋」は染色部分１０〜４０％、「＋＋」は染色部分４０〜９０％、「＋＋＋」は染色部分９０〜１００％とし、その％が高いほど効果があるものとした。結果を表１及び２に記載する。
【００２４】
【表１】

【００２５】
表１の結果のとおり、表１に記載の製剤は、珪藻の駆除効果は不十分な点があるが、十分な赤腐れ駆除効果を有し、しかも海苔葉体への悪影響が低い製剤である。
【００２６】
【表２】

【００２７】
表２の結果のとおり、表２に記載の製剤は、十分な赤腐れ駆除効果や珪藻駆除効果を有する製剤である。またコスト的に安価で調製することができる。
【００２８】
以下、本発明に係る養殖海苔用処理剤の処方例を示す。尚、配合量は重量％である。
【００２９】
＜配合例１＞
（８０％）乳酸５０ｇ、（９０％）酢酸９ｇを、精製水４１ｇに添加し溶解、均一に混合して製剤とした。
【００３０】
＜配合例２＞
（８０％）乳酸１８ｇ、（９０％）酢酸３０ｇ、（７５％）リン酸１１．５ｇ、（３５％）塩酸４ｇを、精製水３６．５ｇに添加し溶解、均一に混合して製剤とした。
【００３１】
＜試験例３＞
上記の配合例１〜２の処理剤を、人工海水で１００倍希釈して処理液を調製した。これに、珪藻が付着した海苔葉体と赤腐れ羅病葉体を用いて、試験例１，２と同様の方法で珪藻駆除効果と赤腐れ駆除効果及び海苔葉体への影響を評価した。その結果を表３に記載する。
【００３２】
【表３】

【００３３】
【発明の効果】
以上詳述した如く、本発明に係る養殖海苔用処理剤並びに養殖海苔用処理液及び養殖海苔の処理方法は、処理液のｐＨ値が高い場合でも、赤腐れ病菌、白腐れ病菌、壺状菌などの養殖海苔の病害や珪藻などの雑藻を駆除することができ、周囲の環境や海苔葉体に悪影響を与えることがない。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a treatment agent for cultured nori, a treatment solution for cultured nori and a method for treating cultured nori, the purpose of which is to cultivate red rot fungi, white rot fungi, fungi, etc., even when the pH of the treatment solution is high Provided are a cultured laver treatment agent, a cultured laver treatment solution, and a cultured laver treatment method that are capable of combating laver diseases and other algae such as diatoms and that do not adversely affect the surrounding environment and laver leaf bodies. There is.
[0002]
[Prior art]
In nori cultivation, if algae, bacteria, and other algae such as aonori, aosa, and diatoms adhere to the laver leaves and laver net, the growth of the laver leaves and the attachment of spores may be hindered, and white rot and red rot Diseases such as rodent fungus may develop, causing serious damage to nori culture.
[0003]
Conventionally, as a technique relating to a processing agent for laver and a processing method for controlling such miscellaneous algae and preventing the onset of diseases, for example, Japanese Patent Publication No. 56-12601, Japanese Patent Publication No. 60-31451, One described in Japanese Laid-Open Patent Application No. 9-201180 is known.
[0004]
Japanese Patent Publication No. 56-12601 includes a saturated aliphatic monocarboxylic acid having 1 to 4 carbon atoms, a saturated or unsaturated dicarboxylic acid having 2 to 4 carbon atoms, glycolic acid, lactic acid, tartaric acid, malic acid, and citric acid. A processing agent for laver containing at least one organic carboxylic acid as an active ingredient is described.
In Japanese Patent Publication No. 60-31451, nori or a cultured device with laver attached is immersed in a treatment solution containing 0.3 to 15% by weight of an organic acid and having a pH adjusted to 1.0 to 4.0. A method for cultivating seaweed that eliminates and prevents miscellaneous algae and diseases is described.
Japanese Patent Application Laid-Open No. 9-20180 discloses a seaweed treatment in which inorganic salts and acids are added to seawater, the specific gravity is adjusted to 1.001 to 1.060, and the pH is adjusted to 0.5 to 3.0. Agents are described.
[0005]
[Problems to be solved by the invention]
The above-mentioned treatment agent for laver and the treatment method are techniques that use an acid treatment agent that contains an organic acid as an active ingredient and has a pH adjusted to an acidic range.
Since the acid treatment agent has an excellent effect as the pH value is lower, it is usually used after being adjusted to about pH 1.5 to 1.8. However, since the acid treating agent is used after being adjusted to such a low pH value, the influence on the surrounding environment was extremely large. Moreover, the influence which it has on a laver leaf body is also large, and the growth of a laver leaf body might be inhibited depending on the case.
Further, if the pH value of the acid treatment agent is increased, the influence on the surrounding environment and the laver leaf can be reduced, but there is a problem that the effect of removing diatoms and the like is reduced.
[0006]
The present invention is capable of eliminating diseases of cultured laver such as red rot fungus, white rot fungus, and fungi, and other algae such as diatoms, even when the pH value of the treatment solution is high, and the surrounding environment and laver leaves An object of the present invention is to provide a cultured laver treatment agent, a cultured laver treatment solution, and a cultured laver treatment method that do not adversely affect the body.
[0007]
[Means for Solving the Problems]
That is, the invention according to claim 1 is an aquaculture for controlling red rot fungi and diatoms, comprising 40 to 52% by weight of lactic acid and 3% to less than 9% by weight of acetic acid as active ingredients. It relates to a processing agent for laver.
The invention according to claim 2 relates to a processing agent for cultured laver for controlling red rot fungi and diatoms, comprising 9 to 18% by weight of lactic acid and 25 to 36% by weight of acetic acid as active ingredients. .
The invention according to claim 3 relates to a processing agent for cultured laver for controlling red rot fungus and diatoms according to claim 1 or 2, characterized by containing phosphoric acid in an amount of less than 10% by weight.
According to claim 4 invention, as an active ingredient, lactic acid from 0.40 to 0.52 wt%, Ri name contains less than 0.03 wt% or more 0.09 wt% acetic acid, pH is 2.0 The present invention relates to a processing solution for cultured nori for controlling red rot fungi and diatoms, which is adjusted to 2.5 .
The invention according to claim 5, as an active ingredient, lactic acid from 0.09 to 0.18 wt%, Ri Na contain from 0.25 to 0.36 wt% of acetic acid, pH is 2.0-2.5 It is related with the processing liquid for culture nori for red rot fungus and diatom control characterized by being adjusted to .
The invention according to claim 6 relates to a treatment solution for cultured laver for controlling red rot fungus and diatoms according to claim 4 or 5, comprising phosphoric acid of less than 0.1 wt%.
Invention, the aquaculture seaweed treatment agent according to any one of claims 1 to 3, Ri Na diluted with seawater, the pH is adjusted to 2.0 to 2.5 according to claim 7 It is related with the processing liquid for culture nori for red rot fungus and diatom control characterized by these.
Invention, the aquaculture seaweed treatment solution according to any one of claims 4 to 7, the required time the contacted farming tools such as laver network seaweed or laver is attached, and red rot fungi according to claim 8 The present invention relates to a method for treating cultured laver characterized by extinguishing diatoms.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the treatment agent for cultured nori, the treatment solution for cultured nori and the method for treating the cultured nori according to the present invention will be described.
First, the cultured laver treatment agent, the cultured laver treatment liquid, and the cultured laver treatment method according to the first embodiment of the present invention will be described. The treatment agent for cultured seaweed (hereinafter simply referred to as treatment agent) according to the first embodiment of the present invention contains lactic acid and acetic acid as active ingredients. The content of lactic acid is 40 to 52% by weight in the total amount of the treatment agent. Moreover, content of acetic acid shall be 3-9 weight% in the processing agent whole quantity. The reason for this is that when used as a short-term treatment agent, it exerts sufficient effects for the elimination and prevention of diatoms and diseases even at pH 2.0 or higher, and has a low impact on the laver leaf body as compared to conventional formulations. .
[0009]
Moreover, the processing agent which concerns on 1st embodiment of this invention can contain phosphoric acid. The reason for containing phosphoric acid is that when the treatment agent is actually used, it is diluted with seawater and used as a treatment solution for cultured laver as described later, but the pH of the treatment solution for cultured laver at this time is adjusted. It is blended for the purpose. Moreover, because phosphoric acid is contained, an excellent effect can be obtained that can eliminate and prevent diseases and miscellaneous algae of cultured seaweed even at a high pH value. Furthermore, by containing phosphoric acid, it is possible to obtain a highly safe treatment agent without adversely affecting the laver leaf body.
The content of phosphoric acid is not particularly limited, but is less than 10% by weight, preferably less than 5 to 10% by weight, based on the total amount of the processing agent. This is because if the phosphoric acid content exceeds 10% by weight, it may adversely affect the surrounding environment, which is not preferable.
[0010]
Furthermore, water, a nutrient component, an inorganic acid, another organic acid, etc. which are contained in a normal processing agent can be arbitrarily arbitrarily mix | blended with the processing agent which concerns on 1st embodiment of this invention.
[0011]
The treatment agent according to the first embodiment of the present invention described above is diluted with seawater or the like as necessary during the actual laver treatment, and the treatment solution for cultured laver according to the first embodiment of the present invention. (Hereinafter, simply referred to as “treatment liquid”). The dilution of the treatment agent may be appropriately adjusted according to the treatment method or the temperature of the seawater, etc. In general, the content of lactic acid as an active ingredient is 0.4 to 0.52% by weight in the total amount of the treatment liquid. It may be diluted with seawater or the like so that Moreover, content of acetic acid at this time shall be 0.03-0.09 weight% in the processing liquid whole quantity. The reason for this is that when used as a short-term treatment agent, it exerts a sufficient effect for eradication and prevention of diatoms and diseases even at a pH of 2.0 or higher, and has a low impact on the laver leaf body as compared with the conventional formulation. .
[0012]
When phosphoric acid is contained, the phosphoric acid content is less than 0.10% by weight in the total amount of the treatment liquid. This is because if it exceeds 0.10% by weight, the surrounding environment may be adversely affected.
[0013]
Furthermore, the pH of the treatment liquid according to the first embodiment of the present invention is not particularly limited, but is preferably adjusted to 2.0 to 2.5. The reason for this is that if the pH is less than 2.0, it may adversely affect the laver leaf body and the surrounding environment, and if it exceeds 2.5 , the algae such as cultivated laver and diatoms are eliminated. This is because, in any case, a sufficient effect for prevention cannot be obtained.
[0014]
The method for treating the cultured nori using the treatment liquid according to the first embodiment of the present invention described above is the same as the conventional method in which the cultivation liquid such as a laver or a laver net attached with the nori is in contact with the treatment liquid for a required time. However, it is preferable to use a treatment method in which a ship is submerged under a laver culture net and processed in a relatively short time while passing the net through the treatment liquid. The processing time by a mogul ship or the like is about 30 to 120 seconds, and usually about 30 to 90 seconds. Furthermore, a method called passing-through processing using a small ship, which is performed in some areas, may be used. This is a processing method in which the processing liquid is accommodated in a container such as a processing liquid tank in the ship, and the ship is submerged under the nori culture net so that the nori culture net is immersed in the processing liquid. In this case, the processing time is about 10 to 20 seconds.
[0015]
Even if the treatment agent and the treatment liquid according to the first embodiment of the present invention described above have a pH of 2.0 or more, a sufficient effect for controlling and preventing diseases of cultured seaweed and miscellaneous algae such as diatom can be obtained. The effect on the leaves is small and easy to use.
[0016]
Next, the cultured laver treatment agent, the cultured laver treatment solution, and the cultured laver treatment method according to the second embodiment of the present invention will be described. The second embodiment of the present invention differs from the first embodiment described above in the contents of lactic acid and acetic acid as active ingredients.
[0017]
The content of lactic acid as an active ingredient is 9 to 18% by weight in the total amount of the processing agent, and the content of acetic acid is 25 to 36% by weight in the total amount of the processing agent. The reason for this is that if lactic acid is less than 9% by weight and acetic acid is 25% by weight or less, a sufficient effect for controlling the disease and miscellaneous algae of cultured seaweed cannot be obtained. This is because, if the content exceeds 5% by weight, the adverse effect on the laver leaf body becomes stronger in spite of the improvement of the effect, and therefore it is not preferable in either case.
[0018]
And it is set as the process liquid which concerns on 2nd embodiment of this invention by diluting the processing agent which concerns on 2nd embodiment of this invention mentioned above with seawater. The content of lactic acid in the treatment liquid according to the second embodiment is 0.09 wt% or more and less than 0.18 wt% in the total treatment liquid, and the content of acetic acid is 0.25 to 0.36 in the total treatment liquid. % By weight. The reason for this is that when lactic acid is less than 0.09% by weight and acetic acid is 0.25% by weight or less, a sufficient effect of controlling diseases and miscellaneous algae of cultured seaweed cannot be obtained, and lactic acid is 0.18% by weight. If acetic acid is contained in excess of 0.36% by weight, the adverse effect on the laver leaf will become strong in spite of the improvement in the effect, and in either case, it is not preferable.
[0019]
The treatment agent and the treatment liquid according to the second embodiment of the present invention described in detail above have a high effect of exterminating and preventing algae such as cultivated laver and diatoms even if the pH is 2.0 or more. Instead, the effect on the laver leaf is small.
The configurations other than those described above are the same as those in the first embodiment described above, and a description thereof will be omitted.
[0020]
【Example】
EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to these Examples at all. In addition, a compounding quantity is weight%.
[0021]
<Preparation of sample>
The processing agent components shown in Tables 1 and 2 below were added to the artificial seawater and dissolved and mixed to prepare a laver treatment solution for each test section. The pH was adjusted with hydrochloric acid and sodium hydroxide as described in the table.
[0022]
<Test Example 1>
Treat each red rot leaflets with each of the above-prepared treatments for 1 minute, thoroughly wash with seawater, and then incubate for 2 days in seawater. The effect was judged. Untreated leaves were tested simultaneously as a control.
In addition, the determination of the effect on red rot disease was expressed as follows. The notation “-” indicates that the disease area has expanded in the same manner as the control, “+” indicates that the disease cells are partially whitened, and there are considerable new infections. “++” indicates that the disease cells are partially white. In the case of “++++”, the diseased cells are partially whitened and there are no new infected parts.
In addition, the influence on the laver leaf body was determined by the staining rate of the laver leaf body by erythrosin staining and the degree of bud damage observed with a microscope. The determination of the staining rate of the nori leaves is shown in the range of “−” to “+++”, “−” is hardly dyed, “±” is 10% or less of the stained part, and “+” is 10 to 40% of the stained part. , “++” is a stained portion of 40 to 90%, “++” is a stained portion of 90 to 100%, and the determination of the degree of bud damage is “◯: No scratch”, “Δ: Slightly scratch”, “×: It was hurt. " The results are listed in Tables 1 and 2.
[0023]
<Test Example 2>
The laver leaf body to which diatoms adhered was treated for 1 minute with each of the prepared treatment solutions, and then thoroughly washed with seawater, then returned to fresh seawater, and the diatom extermination effect was determined. Determination of the diatom extermination effect indicates the staining rate of diatom by erythrosine staining in the range of “−” to “+++”, “−” is hardly dyed, “±” is 10% or less of the stained portion, “+” is The stained portion was 10 to 40%, “++” was the stained portion 40 to 90%, “++” was the stained portion 90 to 100%, and the higher the percentage, the more effective. The results are listed in Tables 1 and 2.
[0024]
[Table 1]

[0025]
As shown in the results of Table 1, the preparations shown in Table 1 have insufficient diatom control effects, but have sufficient red rot control effects and low adverse effects on laver leaves. .
[0026]
[Table 2]

[0027]
As the result of Table 2, the formulation of Table 2 is a formulation which has sufficient red rot extermination effect and diatom extermination effect. Further, it can be prepared at a low cost.
[0028]
Hereinafter, a prescription example of the processing agent for cultured seaweed according to the present invention will be shown. In addition, a compounding quantity is weight%.
[0029]
<Formulation example 1>
50 g of (80%) lactic acid and 9 g of (90%) acetic acid were added to 41 g of purified water, dissolved and uniformly mixed to prepare a preparation.
[0030]
<Formulation example 2>
(80%) Lactic acid 18 g, (90%) Acetic acid 30 g, (75%) Phosphoric acid 11.5 g, (35%) Hydrochloric acid 4 g were added to purified water 36.5 g, dissolved and mixed uniformly to prepare a preparation. .
[0031]
<Test Example 3>
The processing agent of said combination example 1-2 was diluted 100 times with artificial seawater, and the processing liquid was prepared. By using the laver leaf body and red rot leafy leaf adhering to diatom, the diatom extermination effect, the red rot extermination effect, and the influence on the laver leaf body were evaluated in the same manner as in Test Examples 1 and 2. The results are listed in Table 3.
[0032]
[Table 3]

[0033]
【The invention's effect】
As described above in detail, the treatment agent for cultured nori, the treatment solution for cultured nori and the treatment method for cultured nori according to the present invention can be used even when the pH value of the treatment solution is high. It can exterminate diseases such as cultured seaweed and other algae such as diatoms, and does not adversely affect the surrounding environment and the laver leaf.

Claims

A processing agent for cultured laver for controlling red rot fungi and diatoms, comprising 40 to 52% by weight of lactic acid and 3% to less than 9% by weight of acetic acid as active ingredients.

A processing agent for cultured laver for controlling red rot fungi and diatoms, comprising 9 to 18% by weight of lactic acid and 25 to 36% by weight of acetic acid as active ingredients.

The treatment agent for cultured laver for controlling red rot fungus and diatoms according to claim 1 or 2, comprising phosphoric acid less than 10% by weight.

As an active ingredient, lactic acid from 0.40 to 0.52 wt%, Ri name contains less than 0.03 wt% or more 0.09 wt% acetic acid, formed by adjusting the pH is 2.0-2.5 A processing solution for cultured laver for controlling red rot fungi and diatoms.

Wherein as an active ingredient, lactic acid 0.09 to 0.18 wt%, Ri name contains 0.25 to 0.36 wt% of acetic acid, that pH is adjusted to 2.0 to 2.5 A processing solution for cultured laver for controlling red rot fungi and diatoms.

The treatment solution for cultured laver for controlling red rot fungus and diatoms according to claim 4 or 5, characterized by containing phosphoric acid of less than 0.1% by weight.

The aquaculture seaweed treatment agent according to any one of claims 1 to 3, Ri Na diluted with sea water, and red rot fungi, characterized in that the pH is adjusted to 2.0 to 2.5 Treatment solution for cultured seaweed for diatom control.

A culture tool such as a seaweed or a laver net attached to the processing solution for cultured seaweed according to any one of claims 4 to 7 is contacted for a required time to control red rot fungi and diatoms. How to treat cultured seaweed.