JP4493667B2 - How to control chironomid larvae - Google Patents
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- JP4493667B2 JP4493667B2 JP2007023290A JP2007023290A JP4493667B2 JP 4493667 B2 JP4493667 B2 JP 4493667B2 JP 2007023290 A JP2007023290 A JP 2007023290A JP 2007023290 A JP2007023290 A JP 2007023290A JP 4493667 B2 JP4493667 B2 JP 4493667B2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 89
- 238000000034 method Methods 0.000 claims description 20
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 13
- 229910052801 chlorine Inorganic materials 0.000 claims description 13
- 239000000460 chlorine Substances 0.000 claims description 13
- 230000001678 irradiating effect Effects 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000009182 swimming Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 235000013601 eggs Nutrition 0.000 description 5
- 230000012447 hatching Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000002940 repellent Effects 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000012085 test solution Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 244000172533 Viola sororia Species 0.000 description 2
- 230000029264 phototaxis Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 235000005811 Viola adunca Nutrition 0.000 description 1
- 240000009038 Viola odorata Species 0.000 description 1
- 235000013487 Viola odorata Nutrition 0.000 description 1
- 235000002254 Viola papilionacea Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012320 chlorinating reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
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Description
本発明は、貯水部の水中に生息しているユスリカ幼虫の駆除方法に関する。 The present invention relates to a method for controlling chironomid larvae that live in the water of a water reservoir.
ユスリカとは、ハエ目ユスリカ科に属するハエの仲間の昆虫であり、川や池，遊泳用プールなどの貯水部の水中に大量に産卵して、大量の幼虫（ユスリカ幼虫）が水中で生育して動き回り、不快に感じる人が多い。
このようなユスリカの発生を防止するために、従来、卵や幼虫が貯水部の底面近くに生息している点に着目して、貯水部の底面を水中掃除機などで清掃したり、塩素系の薬剤を投入することにより、水中の卵や幼虫を駆除することが考えられている（周知慣用技術であり、適切な先行技術文献情報を開示できない。）。
A chironomid is a fly insect belonging to the family Fliesidae, a large number of larvae (chironomid larvae) that grow in the water, spawning in large quantities in water in water storage areas such as rivers, ponds, and swimming pools. Many people move around and feel uncomfortable.
In order to prevent the occurrence of such chironomids, focusing on the fact that eggs and larvae have inhabited near the bottom of the water storage section, the bottom of the water storage section has been cleaned with an underwater vacuum cleaner, etc. It is considered to eliminate the eggs and larvae in the water by introducing the above chemical (it is a well-known and commonly used technique and cannot disclose appropriate prior art document information).
このため、貯水部の底面を清掃する場合は、面積が広い貯水部ほど、駆除に手間と時間が掛かる欠点があり、また、塩素系の薬剤を投入する場合は、容量が大きい貯水部ほど大量の薬剤を投入する必要があるだけでなく、水中の遊離塩素濃度が増大し過ぎて所定の水質基準を維持できないおそれがある。
ちなみに、遊泳用プールの水質に関して、「厚生労働省健康局長通知遊泳用プールの衛生基準について」（健発第７７４号：２００１年７月２４日）によれば、「遊離残留塩素は、０．４ｍｇＣｌ2／Ｌ以上であること。また、１．０ｍｇＣｌ2／Ｌ以下であることが望ましい。」と規定されている。
そこで、遊離塩素がセスジユスリカの孵化率に及ぼす影響を調べるために、投入塩素量が１０ｍｇ／Ｌ，３０ｍｇ／Ｌ，５０ｍｇ／Ｌ，７５ｍｇ／Ｌ，１００ｍｇ／Ｌの５種類の生育試験溶液を作成して、各生育試験溶液毎に、セスジユスリカの卵塊１個を生育試験溶液と共にシャーレに入れて放置し、放置後の残卵数と孵化数とを実体顕微鏡を用いて計測し、また、放置後の遊離残留塩素濃度を計測した。
図５は孵化率計測結果を示し、図６は遊離残留塩素濃度計測結果を示している。
図５から、投入塩素量が５０ｍｇ／Ｌ以上であれば孵化率が略３０％以下であり、塩素剤の投入が有効であることが分かるが、図６から、放置後の遊離残留塩素濃度が１．０ｍｇ／Ｌを遙かに超えており、遊泳用プールにおけるユスリカの駆除方法としては適切ではないことが分かる。
本発明は上記実情に鑑みてなされたものであって、面積が広い貯水部でも、能率良く駆除できるようにすることを目的とする。
For this reason, when cleaning the bottom surface of the water storage section, the water storage section with a larger area has the disadvantage that it takes time and effort to disinfect it. In addition to the need to add the chemical, there is a risk that the concentration of free chlorine in water will increase too much to maintain the predetermined water quality standard.
By the way, with respect to the water quality of the swimming pool, "About the sanitary standards of the Ministry of Health, Labor and Welfare health director notification swimming pool": According to the (Kenhatsudai No. 774 July 24, 2001), "free residual chlorine, 0. It is 4 mgCl 2 / L or more, and 1.0 mgCl 2 / L or less is desirable ”.
Therefore, in order to investigate the effect of free chlorine on the hatching rate of Sedura chironomid, five types of growth test solutions with 10 mg / L, 30 mg / L, 50 mg / L, 75 mg / L and 100 mg / L of input chlorine were prepared. Then, for each growth test solution, leave one egg mass of Sesuji chironomid together with the growth test solution in a petri dish and measure the number of eggs and hatched eggs after standing using a stereomicroscope. Free residual chlorine concentration was measured.
FIG. 5 shows the hatching rate measurement results, and FIG. 6 shows the free residual chlorine concentration measurement results.
From FIG. 5, it can be seen that the hatching rate is about 30% or less when the input chlorine amount is 50 mg / L or more, and that the introduction of the chlorinating agent is effective, but from FIG. It is far above 1.0 mg / L, indicating that it is not suitable as a chironomid extermination method in swimming pools.
This invention is made | formed in view of the said situation, Comprising: It aims at enabling it to remove efficiently even a water storage part with a large area.
本発明の第１特徴構成は、貯水部の水中に生息しているユスリカ幼虫の駆除方法であって、波長が５７０ｎｍ以上の光の光源と波長が５７０ｎｍ未満の光の光源とを互いに離間させて前記貯水部に配置し、前記各光源の光を前記貯水部の水中に同時に照射することにより、前記波長が５７０ｎｍ未満の光の光源側に誘引されたユスリカ幼虫を駆除する点にある。 A first characteristic configuration of the present invention is a method for controlling chironomid larvae that live in water in a water storage section, wherein a light source having a wavelength of 570 nm or more and a light source having a wavelength of less than 570 nm are separated from each other. The chironomid larvae attracted to the light source side of the light having a wavelength of less than 570 nm are exterminated by being arranged in the water storage unit and simultaneously irradiating the light of each light source into the water of the water storage unit.
〔作用及び効果〕
後述するように、長波長光と短波長光とを水中に同時に照射すると、水中に生息しているユスリカ幼虫が長波長光を忌避し、長波長光よりも波長が短い短波長光に誘引されるという新知見に基づき、長波長光の光源と短波長光の光源とを互いに離間させて貯水部に配置し、各光源の光を貯水部の水中に同時に照射することにより、短波長光の光源側に誘引されたユスリカ幼虫を駆除するのである。
従って、面積が広い貯水部でも、ユスリカ幼虫を短波長光の光源側に集めて、その集まったユスリカ幼虫を能率良く駆除できる。
また、波長が５７０ｎｍ以上の光は、黄色〜赤色の可視光及び赤外線光であり、波長が５７０ｎｍ未満の光は、緑色〜青紫の可視光及び紫外線光であり、ユスリカ幼虫が忌避する波長が５７０ｎｍ以上の長波長光と、ユスリカ幼虫が誘引され易い波長が５７０ｎｍ未満の短波長光とを同時に照射することにより、水中のユスリカ幼虫を短波長光の光源側に積極的に誘引して効率良く集め易い。
[Action and effect]
As described later, when long-wavelength light and short-wavelength light are simultaneously irradiated into water, chironomid larvae that live in the water avoid long-wavelength light and are attracted to short-wavelength light that has a shorter wavelength than long-wavelength light. Based on the new knowledge, the light source of long wavelength light and the light source of short wavelength light are separated from each other and placed in the water reservoir, and the light of each light source is simultaneously irradiated into the water of the water reservoir, thereby It eliminates chironomid larvae attracted to the light source.
Therefore, chironomid larvae can be gathered on the light source side of the short wavelength light even in a water storage section having a large area, and the collected chironomid larvae can be efficiently controlled.
The light with a wavelength of 570 nm or more is yellow to red visible light and infrared light, the light with a wavelength of less than 570 nm is green to blue-violet visible light and ultraviolet light, and the wavelength that chironomid larvae avoid is 570 nm. By simultaneously irradiating the above long-wavelength light and short-wavelength light with a wavelength of less than 570 nm, which attracts chironomid larvae, the chironomid larvae in water are actively attracted to the light source side of the short-wavelength light and efficiently collected easy.
本発明の第２特徴構成は、前記波長が５７０ｎｍ以上の光が赤色光であり、前記波長が５７０ｎｍ未満の光が緑色光、青色光又は紫色光である点にある。 The second characteristic configuration of the present invention is that the light having a wavelength of 570 nm or more is red light, and the light having a wavelength of less than 570 nm is green light, blue light, or violet light .
〔作用及び効果〕
赤色光と、緑色光、青色光又は紫色光との組合せにより、水中のユスリカ幼虫をより効率良く集め易い。
[Action and effect]
The combination of red light and green light, blue light or purple light makes it easier to collect chironomid larvae in water more efficiently.
本発明の第３特徴構成は、前記波長が５７０ｎｍ未満の光の光源側に誘引されたユスリカ幼虫を、前記貯水部の水中に投入した塩素剤で死滅させる点にある。 The third characteristic configuration of the present invention is that the chironomid larvae attracted to the light source side of the light having a wavelength of less than 570 nm are killed by a chlorine agent introduced into the water of the water reservoir.
〔作用及び効果〕
波長が５７０ｎｍ未満の光の光源側に誘引されて集まったユスリカ幼虫を、集中的に貯水部の水中に投入した塩素剤で死滅させるので、全体の水質の残留塩素濃度を高め過ぎることなく、ユスリカ幼虫を水中から特に取り除くことなく、ユスリカの発生を防止できる。
[Action and effect]
Chironomid larvae attracted to the light source side of light having a wavelength of less than 570 nm are killed by the chlorine agent intensively introduced into the water of the water storage section, so that the chironomid It is possible to prevent the occurrence of chironomids without particularly removing larvae from the water.
本発明の第４特徴構成は、前記波長が５７０ｎｍ未満の光の光源側に誘引されたユスリカ幼虫を、前記貯水部の水中に照射した紫外線で死滅させる点にある。 A fourth characteristic configuration of the present invention is that the chironomid larvae attracted to the light source side of the light having a wavelength of less than 570 nm are killed by the ultraviolet rays irradiated into the water in the water storage section.
〔作用及び効果〕
波長が５７０ｎｍ未満の光の光源側に誘引されて集まったユスリカ幼虫を、貯水部の水中に照射した紫外線で死滅させるので、ユスリカ幼虫を水中から特に取り除くことなく、効率良くユスリカの発生を防止できるとともに、塩素剤を投入して死滅させるような場合に比べて、水質が変化してしまうおそれが無く、所定の水質基準を維持する必要がある場合に有効である。
[Action and effect]
Chironomid larvae attracted to the light source side of light having a wavelength of less than 570 nm are killed by ultraviolet rays irradiated into the water of the water storage section, so that the chironomid larvae can be efficiently prevented without being removed from the water. At the same time, there is no fear that the water quality will change compared to the case where the chlorine agent is added and killed, which is effective when it is necessary to maintain a predetermined water quality standard.
本発明の第５特徴構成は、前記波長が５７０ｎｍ未満の光の光源側に誘引されたユスリカ幼虫を、前記貯水部から取り除く点にある。 A fifth characteristic configuration of the present invention is that chironomid larvae attracted to the light source side of the light having a wavelength of less than 570 nm are removed from the water reservoir.
〔作用及び効果〕
波長が５７０ｎｍ未満の光の光源側に誘引されて集まったユスリカ幼虫を貯水部から取り除くので、ユスリカ幼虫そのものの存在確率が減少して、貯水部が遊泳用プールの場合に、特に遊泳者に不快感を与えるおそれが少ない。
[Action and effect]
The chironomid larvae attracted to the light source side of the light having a wavelength of less than 570 nm are removed from the water storage part, so that the probability of the chironomid larvae itself is reduced, and this is particularly inconvenient for the swimmer when the water storage part is a swimming pool. There is little possibility of giving pleasure.
以下に本発明の実施の形態を図面に基づいて説明する。
〔第１実施形態〕
図１は、貯水部としての平面視で矩形の遊泳用の屋内温水プールＰを示し、水Ｗを貯めた温水プールＰの水中に生息しているユスリカ幼虫の本発明による駆除方法を説明する。
Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 shows a rectangular indoor warm water pool P for swimming as a water storage section, and explains a method for controlling chironomid larvae that live in the water of the warm water pool P storing water W according to the present invention.
長波長光を発光する第１光源Ｌ１と、その長波長光よりも波長が短い短波長光を発光する第２光源Ｌ２とを互いに離間させて温水プールＰに配置する。 A first light source L1 that emits long-wavelength light and a second light source L2 that emits short-wavelength light having a shorter wavelength than the long-wavelength light are arranged apart from each other in the hot water pool P.
つまり、温水プールＰの互いに対向する一対の側壁１ａ，１ｂのうちの、一方の側壁１ａ側の水中には、長波長光の第１光源としての超光輝の第１ＬＥＤ照射装置Ｌ１を配置し、他方の側壁１ｂ側の水中には、短波長光の第２光源としての超光輝の第２ＬＥＤ照射装置Ｌ２を配置する。
That is, in the water on one
そして、室内の照明を消した暗闇状態で、第１ＬＥＤ照射装置Ｌ１で波長が６１０〜７８０ｎｍの範囲内の赤色光を、また、第２ＬＥＤ照射装置Ｌ２で波長が４３０〜４６０ｎｍの範囲内の青色光、又は、波長が５００〜５７０ｎｍの範囲内の緑色光、又は、波長が３８０〜４３０ｎｍの範囲内の紫色光を所定時間に亘って同時に水中に照射することにより、第２ＬＥＤ照射装置Ｌ２側に誘引されて集まったユスリカ幼虫を、水中掃除機などで吸引して、温水プールＰから取り除くことにより駆除する。 Then, in the dark state with the room illumination turned off, the first LED irradiation device L1 emits red light having a wavelength of 610 to 780 nm, and the second LED irradiation device L2 has blue light having a wavelength of 430 to 460 nm. Invite to the second LED irradiation device L2 side by irradiating green light within a wavelength range of 500 to 570 nm or purple light within a wavelength range of 380 to 430 nm into water simultaneously for a predetermined time. The chironomid larvae collected are sucked with an underwater vacuum cleaner and removed from the hot water pool P.
この場合、第２ＬＥＤ照射装置Ｌ２側に誘引されて集まったユスリカ幼虫を、水中に照射した紫外線で死滅させてから、その死骸を水中掃除機などで吸引して、温水プールＰから取り除いても良い。 In this case, chironomid larvae attracted and gathered to the second LED irradiation device L2 side may be killed by ultraviolet rays irradiated into the water, and then the dead body may be sucked with an underwater cleaner or the like and removed from the hot water pool P. .
尚、第１ＬＥＤ照射装置Ｌ１で波長が５００〜５７０ｎｍの範囲内の緑色光を、また、第２ＬＥＤ照射装置Ｌ２で波長が４３０〜４６０ｎｍの範囲内の青色光を所定時間に亘って同時に水中に照射しても良い。 In addition, the first LED irradiation device L1 emits green light within a wavelength range of 500 to 570 nm, and the second LED irradiation device L2 simultaneously emits blue light within a wavelength range of 430 to 460 nm into water for a predetermined time. You may do it.
〔第２実施形態〕
図示しないが、平面視形状が矩形以外の遊泳用プールや池などの貯水部Ｐの水中に生息しているユスリカ幼虫を駆除する場合は、貯水部Ｐの水面に沿った方向で対向する二箇所において、一方に長波長光の第１光源Ｌ１を配置し、他方に短波長光の第２光源Ｌ２を配置して実施できる。
[Second Embodiment]
Although not shown in the figure, when exterminating chironomid larvae that live in the water of the water storage part P such as swimming pools and ponds other than the rectangular shape in plan view, two places facing in the direction along the water surface of the water storage part P The first light source L1 of long wavelength light is arranged on one side, and the second light source L2 of short wavelength light is arranged on the other side.
〔その他の実施形態〕
１．本発明によるユスリカ幼虫の駆除方法は、遊泳用プールや池以外に、河川や用水，水槽などの貯水部の水中に生息しているユスリカ幼虫を駆除するために使用しても良い。
２．本発明によるユスリカ幼虫の駆除方法は、長波長光の光源と短波長光の光源とを互いに離間させて貯水部の水面上に配置して実施しても良い。
３．本発明によるユスリカ幼虫の駆除方法は、貯水部の水質基準を維持できる場合は、短波長光の光源側に誘引されて集まったユスリカ幼虫を、貯水部の水中に塩素剤を投入して死滅させても良く、死滅させたユスリカ幼虫の死骸を水中掃除機などで吸引して、貯水部から取り除いても良い。
４．本発明によるユスリカ幼虫の駆除方法は、第１〜第４齢期のいずれの齢期のユスリカ幼虫を駆除するために使用しても良い。
[Other Embodiments]
1. The chironomid larvae extermination method according to the present invention may be used to exterminate chironomid larvae that inhabit the water of water storage units such as rivers, irrigation water, and water tanks in addition to swimming pools and ponds.
2. The chironomid larvae extermination method according to the present invention may be carried out by arranging a light source of long-wavelength light and a light source of short-wavelength light so as to be spaced apart from each other on the water surface of the water storage section.
3. The chironomid larvae extermination method according to the present invention kills chironomid larvae attracted to the light source side of the short wavelength light by introducing a chlorine agent into the water of the water storage unit when the water quality standard of the water storage unit can be maintained. Alternatively, the dead dead chironomid larvae may be sucked with an underwater vacuum cleaner and removed from the water reservoir.
4). The method for extermination of chironomid larvae according to the present invention may be used for extermination of chironomid larvae in any of the first to fourth instar stages.
本発明によるユスリカ幼虫の駆除方法の有効性を確認するために、図２に示すように、貯水部Ｐを模した試験容器（縦21.0cm×横3.5cm×高さ1.0cm）２に水Ｗを入れ、その水中にセスジユスリカの幼虫Ｙを生息させて、超光輝ＬＥＤ照射装置による光照射環境下におけるユスリカ幼虫の走光反応を調べる試験を実施した。 In order to confirm the effectiveness of the method for extermination of chironomid larvae according to the present invention, as shown in FIG. 2, water W is placed in a test container (21.0 cm long × 3.5 cm wide × 1.0 cm high) 2 simulating a water reservoir P. The larvae of Sesuji chironomid Y were inhabited in the water, and a test was carried out to investigate the phototaxis reaction of chironomid larvae in a light irradiation environment with a super bright LED irradiation device.
［試験方法］
水Ｗを入れた試験容器２の長手方向中央における水中に筒状の囲い３を設置し、その試験容器２の上を透明のアクリル樹脂板４で覆っておく。
このアクリル樹脂板４は、その両端部に形成してある貫通孔に第１ＬＥＤランプＡと、第２ＬＥＤランプＢとを夫々臨ませてあり、長手方向中央部には操作用貫通孔５を形成してある。
[Test method]
A
The
そして、３０匹のユスリカ幼虫を、操作用貫通孔５を通して囲い３の内側に投入した後、囲い３を操作用貫通孔５を通して取り除き、第１ＬＥＤランプＡを点灯せずに第２ＬＥＤランプＢのみを暗室内で点灯した場合と、発光色が互いに異なる第１ＬＥＤランプＡと第２ＬＥＤランプＢとを暗室内で同時に点灯した場合との夫々について、ＬＥＤランプＡ，Ｂの光を水中に１時間照射して、ユスリカ幼虫Ｙの走光反応を観察し、予め区画してある領域毎にユスリカ幼虫Ｙの数をカウントした。
Then, after thirty chironomid larvae were introduced into the inside of the
前記第１，第２ＬＥＤランプＡ，Ｂとして、赤色光（波長６２５ｎｍ）を発光するＬＥＤランプと、緑色光（波長５３０ｎｍ）を発光するＬＥＤランプと、青色光（波長４７０ｎｍ）を発光するＬＥＤランプと、紫色光（波長３９５〜４０５ｎｍ）を発光するＬＥＤランプとを使用した。 As the first and second LED lamps A and B, an LED lamp that emits red light (wavelength 625 nm), an LED lamp that emits green light (wavelength 530 nm), and an LED lamp that emits blue light (wavelength 470 nm); An LED lamp emitting violet light (wavelength 395 to 405 nm) was used.
前記第２ＬＥＤランプＢのみを暗室内で点灯した場合として、４齢期のユスリカ幼虫Ｙを対象にして、赤色光を照射した場合と、青色光を照射した場合との夫々について試験を行った。 As a case where only the second LED lamp B was lit in a dark room, a test was carried out for each of the case of radiating red light and the case of irradiating blue light for a 4th-year-old chironomid larva Y.
前記第１，第２ＬＥＤランプＡ，Ｂを暗室内で同時に点灯した場合として、２齢期のユスリカ幼虫Ｙを対象にして、第１ＬＥＤランプＡで赤色光を照射し、かつ、第２ＬＥＤランプＢで紫色光を照射する組み合わせについて試験を行い、また、４齢期のユスリカ幼虫Ｙを対象にして、第１ＬＥＤランプＡで赤色光を照射し、かつ、第２ＬＥＤランプＢで青色光を照射する組み合わせと、第１ＬＥＤランプＡで赤色光を照射し、かつ、第２ＬＥＤランプＢで緑色光を照射する組み合わせと、第１ＬＥＤランプＡで青色光を照射し、かつ、第２ＬＥＤランプＢで緑色光を照射する組み合わせとの夫々について試験を行った。 Assuming that the first and second LED lamps A and B are simultaneously turned on in a dark room, the second LED lamp B emits red light from the first LED lamp A and targets the second-in-year chironomid larva Y. A combination of irradiating purple light with a combination of radiating red light with the first LED lamp A and irradiating blue light with the second LED lamp B for a chironomid larva Y in the 4th infancy The first LED lamp A emits red light and the second LED lamp B emits green light, the first LED lamp A emits blue light, and the second LED lamp B emits green light. Each of the combinations was tested.
図３，図４は、第１ＬＥＤランプＡの照射光（Ａ光）を基準にした時の、百分率相関法によるセスジユスリカ幼虫Ｙの走光反応を示し、図３は２齢期のユスリカ幼虫Ｙを対象とした場合を示し、図４は４齢期のユスリカ幼虫Ｙを対象とした場合を示し、いずれも、５０％を越えれば５％危険率で有意であることを示す。 3 and 4 show the photoreceptive response of the chironomid larvae Y by the percentage correlation method based on the irradiation light (A light) of the first LED lamp A, and FIG. FIG. 4 shows a case where the chironomid larva Y of the 4th instar stage is used as a target, and in any case, if it exceeds 50%, it is significant at a 5% risk rate.
図３から、２齢期のユスリカ幼虫Ｙについては、赤色光に対する忌避性と、紫色光に対する誘引性とを確認することができる。 From FIG. 3, it is possible to confirm the repellent property against red light and the attractive property against purple light for chironomid larvae Y in the second instar stage.
また、図４から、４齢期のユスリカ幼虫Ｙについては、第２ＬＥＤランプＢの照射光
（Ｂ光）のみを照射した試験結果から、赤色光に対する忌避性と青色光に対する誘引性と確認することができ、第１ＬＥＤランプＡの照射光（Ａ光）と第２ＬＥＤランプＢの照射光（Ｂ光）との組み合わせでは、赤色光に対する忌避性と、青色光に対する誘引性がより顕著であり、赤色光と緑色光との組み合わせでは緑色光に明らかな誘引性が見られ、青色光と緑色光との組み合わせでは青色光に誘引性が見られる。
In addition, from FIG. 4, for the chironomid larvae Y in the 4th infancy period, it is confirmed from the test results of irradiating only the irradiation light (B light) of the second LED lamp B that it is repellent to red light and attractive to blue light. In the combination of the irradiation light (A light) of the first LED lamp A and the irradiation light (B light) of the second LED lamp B, the repellent property against red light and the attracting property against blue light are more remarkable. The combination of light and green light shows a clear attractiveness to green light, and the combination of blue light and green light shows attractiveness to blue light.
従って、赤色光，緑色光，青色光間の誘引性は、青色光、緑色光、赤色光の順に強くなると考えられ、特に、４齢期のユスリカ幼虫Ｙについては、より短波長光に対して強い誘引性を示すものと推察でき、長波長光と短波長光とを水中に同時に照射すると、水中に生息しているユスリカ幼虫が長波長光を忌避し、長波長光よりも波長が短い短波長光に誘引されることが分かる。 Therefore, it is considered that the attractiveness among red light, green light, and blue light becomes stronger in the order of blue light, green light, and red light. It can be inferred that it exhibits strong attractiveness. When long-wavelength light and short-wavelength light are simultaneously irradiated into the water, chironomid larvae that live in the water repel long-wavelength light and have shorter wavelengths than long-wavelength light. It can be seen that it is attracted to wavelength light.
Ｌ１ 波長が５７０ｎｍ以上の光の光源
Ｌ２ 波長が５７０ｎｍ未満の光の光源
Ｐ 貯水部
Ｙ ユスリカ幼虫
Light source with light having an L1 wavelength of 570 nm or more Light source with light having an L2 wavelength of less than 570 nm P Water reservoir Y Chironomid larva
Claims (5)
波長が５７０ｎｍ以上の光の光源と波長が５７０ｎｍ未満の光の光源とを互いに離間させて前記貯水部に配置し、
前記各光源の光を前記貯水部の水中に同時に照射することにより、前記波長が５７０ｎｍ未満の光の光源側に誘引されたユスリカ幼虫を駆除する駆除方法。 A method for controlling chironomid larvae that inhabit the water of the water reservoir,
A light source having a wavelength of 570 nm or more and a light source having a wavelength of less than 570 nm are spaced apart from each other and disposed in the water storage section;
The extermination method which exterminates chironomid larva attracted to the light source side of the light whose wavelength is less than 570 nm by simultaneously irradiating the light of each light source into the water of the water reservoir.
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