JP6938017B2 - How to exterminate underwater pests - Google Patents
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- 241000607479 Yersinia pestis Species 0.000 title claims description 32
- 241000237858 Gastropoda Species 0.000 claims description 52
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- 239000002184 metal Substances 0.000 claims description 41
- 229910052751 metal Inorganic materials 0.000 claims description 41
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- 229910001431 copper ion Inorganic materials 0.000 claims description 31
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Description
この発明は、水田や川などに生息する貝類である水中有害動物を駆除するための水中有害動物の駆除方法に関する。 This invention also relates to a method of combating water pest for combating water pests are mollusks which live like paddy fields and rivers.
従来から、水田などに生息し水稲の苗を食べてしまうスクミリンゴガイ（学名リンゴスクミ貝）や、各種の水利施設で大発生し、通水障害や水質の悪化をもたらすカワヒバリガイによる被害が問題になっている。 Traditionally, the damage caused by the apple snail (scientific name: apple snail), which inhabits paddy fields and eats paddy rice seedlings, and the Limnoperna fortunei, which causes water flow obstruction and deterioration of water quality due to outbreaks at various irrigation facilities, has become a problem. ..
従来、特許文献１に開示されているように、スクミリンゴガイを駆除する方法として、カルタップ粒剤や石灰窒素等の農薬を施用する方法や、樹脂酸を有効成分として含有する水中有害動物の駆除剤を施用する方法があった。 Conventionally, as disclosed in Patent Document 1, as a method for exterminating apple snails, a method for applying pesticides such as cartap granules and lime nitrogen, and an agent for exterminating harmful animals in water containing a resin acid as an active ingredient are used. There was a way to apply it.
しかし、スクミリンゴガイを駆除する場合、特許文献１の従来技術に記載されているように農薬を施用すると、メダカやフナ等の無害な動物も死なせてしまうおそれがある。さらに、農薬が水稲に吸収されることから、人用食物の安全性を確保するため、農薬の施用量が制限されるので、確実な駆除効果を期待しにくいものである。さらに、特許文献1に開示された樹脂酸を配合した水中有害動物の駆除剤でも、天然物由来の成分であるが、毒性を有する場合がある。しかも、樹脂酸が疎水性であるので溶剤や界面活性剤、乳化剤等により水溶性にして使用する必要があり、溶剤等の添加剤の毒性もあることから、人や有用生物に害を与える可能性がある。 However, in the case of exterminating apple snails, if pesticides are applied as described in the prior art of Patent Document 1, harmless animals such as medaka and crucian carp may also be killed. Furthermore, since pesticides are absorbed by paddy rice, the application rate of pesticides is limited in order to ensure the safety of human food, so it is difficult to expect a reliable extermination effect. Further, the pest control agent for aquatic pests containing the resin acid disclosed in Patent Document 1 is also a component derived from a natural product, but may have toxicity. Moreover, since the resin acid is hydrophobic, it must be made water-soluble with a solvent, surfactant, emulsifier, etc., and the additives such as the solvent are toxic, so it can be harmful to humans and useful organisms. There is sex.
そこで、特許文献２、特許文献３に開示されているように、銅や亜鉛の金属粉を皮膜形成樹脂中に配合し、必要な場所に塗料として塗布する忌避剤が提案されている。さらに、特許文献４や、本願出願人による特許文献５に開示されているように、銅と亜鉛の合金または銅からなる金属繊維を通水性のある充填容器に充填したものもあった。この駆除具をタンク等の水の中に設置すると、金属繊維から溶出する銅イオン及び亜鉛イオンの酸化還元作用により、藻類の発生を抑え、スクミリンゴガイ等を忌避または駆除する効果が得られる。 Therefore, as disclosed in Patent Documents 2 and 3, a repellent agent has been proposed in which a metal powder of copper or zinc is blended in a film-forming resin and applied as a paint to a necessary place. Further, as disclosed in Patent Document 4 and Patent Document 5 by the applicant of the present application, some of them are filled in a water-permeable filling container with an alloy of copper and zinc or a metal fiber made of copper. When this extermination tool is installed in water such as a tank, the redox action of copper ions and zinc ions eluted from the metal fibers suppresses the generation of algae and has the effect of repelling or exterminating apple snails and the like.
例えば、西日本に広く分布するスクミリンゴガイは、その繁殖能力が強く日本の稲作やその他水田を使う農作業にとって大きな問題となっている。スクミリンゴガイは、冬期間、気温が零度を下回らない地域では越冬可能であり、土中で約６ヶ月間の乾燥にも耐えうるというデータもある。そして、春季になり水田に代掻きの水入れが始まると、スクミリンゴガイは土中から土中表面に出て活動を始める。現在日本の稲作では種子をある程度育てて、定植する方法（田植え）が一般的であるが、この田植えをした直後の稲の苗がスクミリンゴガイのエサとなり食害を発生させる。 For example, the apple snail, which is widely distributed in western Japan, has a strong fertility and has become a major problem for rice cultivation in Japan and other agricultural work using paddy fields. There is also data that apple snails can overwinter in areas where the temperature does not fall below zero during the winter, and can withstand drying in the soil for about 6 months. Then, in the spring, when the paddy field begins to be filled with water, the apple snail goes out from the soil to the surface of the soil and begins to work. Currently, in Japanese rice cultivation, the method of growing seeds to some extent and planting them (rice planting) is common, but the rice seedlings immediately after this rice planting serve as food for apple snails and cause feeding damage.
現在スクミリンゴガイの食害防止には毒エサ系の農薬が認可されており、その他、認可されておらず使用も禁止されている椿油粕をまく方法も行われている。しかし、毒エサ系の問題点は、ある程度個体の大きくなったスクミリンゴガイしか食べてくれないということと、水中に撒いた場合、２日から１週間程度で毒エサがふやけてしまい、食べなくなって効果が継続しないと言う問題がある。また、椿油粕は法律で使用が禁止されているとともに、魚毒性が非常に強いため、散布後水田用水が河川に流出すると、河川全体の魚の全滅という事故も起こりかねない危険性がある。また椿油の毒性は、効果が約１時間でなくなり、水田の土中表面のスクミリンゴガイには効果があるが、散布時に土中にいるスクミリンゴガイには効果がないため、翌日新たなスクミリンゴガイによる食害が発生する。従って、従来のスクミリンゴガイ対策には数々の問題点があり、農家は何回も違法な椿油や、毒エサ系の農薬の散布が必要となっている。 Currently, poisonous food pesticides are approved to prevent feeding damage to apple snails, and there is also a method of sprinkling camellia oil cake, which is not approved and its use is prohibited. However, the problem with the poisonous food system is that it only eats apple snails that have grown to a certain extent, and when sprinkled in water, the poisonous food becomes soggy in about 2 days to 1 week, and it is effective to stop eating. There is a problem that it does not continue. In addition, the use of camellia oil cake is prohibited by law, and the toxicity of fish is extremely high. Therefore, if the paddy water flows into the river after spraying, there is a risk that the fish in the entire river may be wiped out. In addition, the toxicity of camellia oil disappears in about 1 hour, and it is effective for apple snails on the soil surface of paddy fields, but it is not effective for apple snails in the soil at the time of spraying, so feeding damage by new apple snails occurs the next day. do. Therefore, there are many problems with conventional apple snail countermeasures, and farmers are required to spray illegal camellia oil and poisonous food pesticides many times.
また、特許文献４、特許文献５に開示された駆除材料は、スクミリンゴガイの忌避及び駆除効果は確認されたが、銅イオンや亜鉛イオンを広く拡散させるため、水田の水口に設置し、水田の中に水がいっぱいになっても排水口を開け、２〜３日間銅イオン等を広く水田全体に行き渡らせる必要がある。しかし、稲作において水が豊富でない地域もあり、そのような場所では限られた水を生かすために、給排水同時の使用は行えないという実態があった。給排水を同時に行わないと、銅イオン等の効果が限定的となり、スクミリンゴガイによる食害を均一に防止できないと言う問題がある。 In addition, the extermination materials disclosed in Patent Documents 4 and 5 have been confirmed to have repellent and extermination effects on apple snails, but in order to widely disperse copper ions and zinc ions, they were installed at the mouth of the paddy field and inside the paddy field. Even if the water is full, it is necessary to open the drain and spread copper ions etc. widely throughout the paddy field for 2 to 3 days. However, there are some areas where water is not abundant in rice cultivation, and in such places it is not possible to use water supply and drainage at the same time in order to make use of the limited water. If water supply and drainage are not performed at the same time, the effects of copper ions and the like will be limited, and there is a problem that feeding damage by apple snails cannot be uniformly prevented.
本発明は、上記背景技術に鑑みて成されたものであり、特定の有害動物であるスクミリンゴガイ等の貝類を、少量の使用で効果的に忌避及び駆除することができ、他の動物や人に害を与えない水中有害動物の駆除方法を提供することを目的とする。 The present invention has been made in view of the above background techniques, and can effectively repel and exterminate shellfish such as apple snails, which are specific pests, with a small amount of use, and can be used for other animals and humans. It is an object of the present invention to provide a method for exterminating harmful aquatic animals that does not cause harm.
本発明は、銅粉及び銅亜鉛合金粉である金属粉を、稲の苗の定植時及びその後一定期間内に水田に散布し、前記金属粉から銅イオンや亜鉛イオンを溶出させ、前記銅イオンや前記亜鉛イオンの作用により、巻貝又は二枚貝の水中有害動物が生息する水中から前記有害動物を駆除する水中有害動物の駆除方法である。 In the present invention, a metal powder which is a copper powder and a copper-zinc alloy powder is sprayed on a paddy field at the time of planting rice seedlings and within a certain period thereafter , and copper ions and zinc ions are eluted from the metal powder to elute the copper ions. This is a method for exterminating aquatic pests from the water in which aquatic pests such as curly shellfish or copper shells inhabit by the action of zinc ions.
前記金属粉の散布は、除草剤に前記金属粉を混ぜて、前記苗の定植時及びその後一定期間内に前記除草剤の散布と同時に行うものである。除草剤を散布しない無農薬栽培や減農薬栽培の水田では、前記金属粉の散布は、土壌粒と肥料の少なくとも一方に前記金属粉を混ぜて、前記苗の定植時及びその後一定期間内に行うものでも良い。 The spraying of the metal powder is carried out by mixing the metal powder with the herbicide and simultaneously spraying the herbicide at the time of planting the seedlings and within a certain period thereafter. In paddy fields cultivated without pesticides or with reduced pesticides without spraying herbicides, the metal powder is sprayed by mixing the metal powder with at least one of soil grains and fertilizer, and at the time of planting the seedlings and within a certain period thereafter. It may be a thing.
前記水中有害動物はスクミリンゴガイであり、前記金属粉の散布は、前記苗の定植時から４週間までの期間、好ましくは３週間程度の間行い、前記期間経過後は散布を行わないものである。 The aquatic pest is a apple snail, and the metal powder is sprayed for a period of up to 4 weeks, preferably about 3 weeks from the time of planting the seedlings, and is not sprayed after the period has elapsed.
本発明の有害動物の駆除方法は、銅粉及び銅亜鉛合金粉である金属粉と、水田に散布する散布剤を混合して成る水中有害動物の駆除剤を用いるものである。 The pest extermination method of the present invention uses an aquatic pest extermination agent formed by mixing a metal powder which is a copper powder and a copper-zinc alloy powder and a spray agent to be sprayed on a paddy field.
前記散布剤は、除草剤、肥料、及び土壌粒のうちの少なくとも一つである。前記金属粉は、粒径が６０〜１０００μｍであると良い。さらに、前記金属粉は、銅と亜鉛の配合質量比が、８０：２０〜６０：４０である。 The spray is at least one of a herbicide, a fertilizer, and a soil grain. The metal powder preferably has a particle size of 60 to 1000 μm. Further, the metal powder has a compounding mass ratio of copper and zinc of 80:20 to 60:40.
本発明の水中有害動物の駆除方法によれば、スクミリンゴガイを含む貝類を簡単かつ確実に駆除することができ、他の作物や養殖魚等の有用生物に害を与えないものである。また、銅及び亜鉛は、人体に必須の栄養元素であり、しかも、水中に溶け出す銅イオンや亜鉛イオンの量は、銅と亜鉛のイオン化傾向の差や銅表面の酸化等による制約によって制限されるので、人に害を与えるおそれがない。特に、面積の広い水田や水量を確保できない水田でも確実にスクミリンゴガイ等の駆除を容易且つ確実に行うことが出来る。また、散布を数週間で停止することにより、その後は、スクミリンゴガイ等は太く硬くなった稲の苗を食べずに、より柔らかい雑草を食べてくれるので、その後の除草剤の散布を抑えることができ、スクミリンゴガイ等を益虫として利用することができる。 According to the method for exterminating aquatic pests of the present invention, shellfish including apple snails can be easily and surely exterminated without damaging other crops or useful organisms such as farmed fish. In addition, copper and zinc are essential nutrient elements for the human body, and the amount of copper ions and zinc ions dissolved in water is limited by the difference in ionization tendency between copper and zinc and restrictions due to oxidation of the copper surface. Therefore, there is no risk of harming people. In particular, even in paddy fields with a large area or paddy fields where the amount of water cannot be secured, it is possible to easily and surely exterminate apple snails and the like. In addition, by stopping the spraying in a few weeks, the apple snails and the like will eat softer weeds without eating the thick and hard rice seedlings, so the subsequent spraying of the herbicide can be suppressed. , Apple snails, etc. can be used as beneficial insects.
以下、本発明の水中有害動物の駆除方法と駆除剤の一実施形態について、図１に基づいて説明する。この実施形態の水中有害動物の駆除剤１０は、水田１２に生息するスクミリンゴガイ等の巻貝を駆除するものである。 Hereinafter, an embodiment of the method for exterminating pests in water and the exterminating agent of the present invention will be described with reference to FIG. The aquatic pest control agent 10 of this embodiment exterminates snails such as apple snails that inhabit the paddy field 12.
駆除剤１０は、粉状の除草剤１４に、銅粉及び銅亜鉛合金粉である金属粉１６を混合したものである。銅及び銅亜鉛合金粉の金属粉１６は、銅と亜鉛の質量配合比が８０：２０〜６０：４０程度、好ましくは７０：３０〜６５：３５である。亜鉛の割合が上記より少ないと、銅イオンが多くなることによる有用生物への影響があり、亜鉛の割合が上記より多いと忌避効果が十分に得られないからである。金属粉１６の直径は、６０〜１０００μｍ、好ましくは２００〜５００μｍ程度である。この程度の直径にすることで、製造が容易で、単位体積当たりの表面積が大きくなり、水中に散布されたときに水との接触面積が大きくなって、銅イオンや亜鉛イオンが溶出しやすくなる。また、除草剤１４の粉とも良好に混合され、散布が容易になる。金属粉１６の量は、適宜設定可能であるが、水１０００リットルに対して２５０〜３５０ｇ程度で効果が確認されているが、条件によりより少量の金属粉１６でも効果がある。 The extermination agent 10 is a mixture of a powdery herbicide 14 and a metal powder 16 which is a copper powder and a copper-zinc alloy powder. The metal powder 16 of copper and copper-zinc alloy powder has a mass compounding ratio of copper and zinc of about 80:20 to 60:40, preferably 70:30 to 65:35. This is because if the proportion of zinc is lower than the above, there is an effect on useful organisms due to the increase in copper ions, and if the proportion of zinc is higher than the above, the repellent effect cannot be sufficiently obtained. The diameter of the metal powder 16 is about 60 to 1000 μm, preferably about 200 to 500 μm. With this diameter, it is easy to manufacture, the surface area per unit volume is large, the contact area with water is large when sprayed in water, and copper ions and zinc ions are easily eluted. .. It also mixes well with the herbicide 14 powder, facilitating spraying. The amount of the metal powder 16 can be appropriately set, and the effect has been confirmed at about 250 to 350 g with respect to 1000 liters of water, but a smaller amount of the metal powder 16 is also effective depending on the conditions.
駆除剤１０の散布方法は、図１に示すように、水田１２の水１２ａに散布するだけでよい。散布は、稲の苗１８の定植時に行う通常の作業である除草剤１４の散布と同時に行う。水田に散布する散布剤である除草剤１４に金属粉１６を混ぜたものを、水中有害動物の駆除剤１０として散布すれば良い。通常は、田植機に付属している除草剤の散布装置を利用して、田植えと同時に散布する。その他、除草剤１４を散布しない無農薬栽培や減農薬栽培の水田１２では、例えば、田植機で散布可能な土壌粒に金属粉１６を混ぜたり、肥料に金属粉１６を混ぜて、苗１８の定植時に散布しても良い。金属粉１６を混合する対象の散布剤は、除草剤や肥料、土壌粒の他、適宜選択されるもので、これらを組み合わせた散布剤でも良い。
As shown in FIG. 1, the pest control agent 10 may be sprayed only on the water 12a of the paddy field 12. The spraying is performed at the same time as the spraying of the herbicide 14, which is a normal operation performed at the time of planting the
散布された水中有害動物の駆除剤１０は、除草剤１４等はその機能をそのまま発揮するとともに、水田１２の水１２ａ中で、銅や銅亜鉛合金粉である金属粉１６の表面から銅イオン及び亜鉛イオンが徐々に溶け出す。そして、水田１２全体に銅イオン及び亜鉛イオンが広がり、イオン濃度が所望の値、例えば、銅イオン濃度が約０．００５〜０．００２ｐｐｍ、亜鉛イオン濃度は約０．００５〜０．０２ｐｐｍとなる。銅イオンや亜鉛イオンは、水田１２の水１２ａ中の有機物と結着し、水中土中表面に堆積する。それを土中表面を移動するスクミリンゴガイが体内に取り入れ、スクミリンゴガイが駆除または忌避される。 In the sprayed aquatic pest repellent 10, the herbicide 14 and the like exert their functions as they are, and copper ions and copper ions and copper ions and copper ions and copper ions are generated from the surface of the metal powder 16 which is a copper or copper-zinc alloy powder in the water 12a of the paddy field 12. Zinc ions gradually dissolve. Then, copper ions and zinc ions spread throughout the paddy field 12, and the ion concentration becomes a desired value, for example, the copper ion concentration is about 0.005 to 0.002 ppm, and the zinc ion concentration is about 0.005 to 0.02 ppm. .. Copper ions and zinc ions bind to organic matter in the water 12a of the paddy field 12 and are deposited on the surface of the soil in the water. The apple snail that moves on the surface of the soil takes it into the body, and the apple snail is exterminated or repelled.
なお、スクミリンゴガイ等の有害な巻貝の食害は、定植した直後の稲が柔らかい３週間程度であり、その期間を超えた後は、スクミリンゴガイ等の有害な巻貝は固くなった稲は食べず害を及ぼさない。むしろその後は、水田１２に生えてくる柔らかい雑草を好んで食べる。従って、金属粉１６の散布は、苗１８の定植後３週間、長くても４週間までの期間に行い、前記期間の経過後は散布を行う必要がなく、行わない方がスクミリンゴガイ等が雑草を好んで食べてくれ、除草効果が得られて良いと言える。従って、金属粉１６の散布を苗１８の定植後一定期間で止めることにより、低農薬で稲を育てられるという利点もある。
In addition, harmful snails such as apple snails eat for about 3 weeks when the rice is soft immediately after planting, and after that period, harmful snails such as apple snails do not eat hardened rice and cause harm. No. Rather, after that, I prefer to eat the soft weeds that grow in the paddy field 12. Therefore, the metal powder 16 is sprayed within a period of 3 weeks after planting the
スクミリンゴガイの忌避及び駆除効果は、銅イオン及び亜鉛イオンが、スクミリンゴガイの体内に取り込まれて互いに協働し、代謝に関わる蛋白質を取り込もうとする機能を失わせることによると考えられる。これにより、設置してから数日で、スクミリンゴガイが土中に隠れて水面から見えなくなり、その後も姿を現さなくなる。なお、発明者が行った実験では、水田１２の水１２ａ中に溶け出すのが亜鉛イオンだけの場合は、スクミリンゴガイを死滅させる効果が弱くなり、溶け出すのが銅イオンだけの場合は、一定のイオン濃度を超えると、他の無害な動物に悪影響が出るおそれがあることから、銅イオンと亜鉛イオンの両方が水中に存在することが好ましい。 It is considered that the repellent and extermination effect of apple snails is due to the fact that copper ions and zinc ions are taken into the body of apple snails and cooperate with each other to lose the function of taking up proteins involved in metabolism. As a result, within a few days after installation, the apple snail hides in the soil and disappears from the surface of the water, and then disappears. In the experiment conducted by the inventor, when only zinc ions are dissolved in the water 12a of the paddy field 12, the effect of killing the apple snail is weakened, and when only copper ions are dissolved, it is constant. It is preferable that both copper and zinc ions are present in the water, as exceeding the ion concentration may adversely affect other harmless animals.
以上説明したように、駆除剤１０は、水田１２の水１２ａ中に散布するだけで、水田１２に生息するスクミリンゴガイ等の有害な巻貝を簡単かつ確実に駆除することができる。特に、銅と亜鉛の金属粉１６は、水田１２の水１２ａ中の銅イオン及び亜鉛イオンの濃度を迅速に好適な値に上昇させ、スクミリンゴガイ等の有害な巻貝を効果的に駆除することができる。 As described above, the pest control agent 10 can easily and surely exterminate harmful snails such as apple snails inhabiting the paddy field 12 simply by spraying it in the water 12a of the paddy field 12. In particular, the copper and zinc metal powder 16 can quickly raise the concentrations of copper ions and zinc ions in the water 12a of the paddy field 12 to suitable values, and can effectively exterminate harmful snails such as apple snails. ..
この金属粉１６から溶け出る銅イオン及び亜鉛イオンは、極めて微量であり、日本の排水基準や農業用水の水質基準に合致し、使用後の土壌環境基準も十分に満たす安全性を備えている。従って、人体及び農作物、有害動物以外の動植物には全く影響がないものであり、水田等に長期間使い続けたとしても、無害なものである。 The amount of copper ions and zinc ions dissolved from the metal powder 16 is extremely small, and it is safe enough to meet Japanese wastewater standards and agricultural water quality standards, and to sufficiently meet the soil environmental standards after use. Therefore, it has no effect on the human body, agricultural products, animals and plants other than pests, and is harmless even if it is used for a long period of time in paddy fields and the like.
また、特許文献５の駆除剤の場合、水田１２への最初の水入れの時から銅イオン及び亜鉛イオンを供給しても、水中に含まれたイオンが土中にも染み込んでしまい、効率的にスクミリンゴガイ等の有害な巻貝を駆除また忌避させるものではなかった。しかし、銅イオン及び亜鉛イオンを発生させる金属粉１６を、稲の苗１８の定植後、苗１８の近くに均一に散布することにより、土中への無駄なイオン投入を防ぎ、より効率的にスクミリンゴガイ等の有害な巻貝を駆除または忌避し、食害防止効果を得ることができる。
Further, in the case of the pesticide of Patent Document 5, even if copper ions and zinc ions are supplied from the time of the first watering to the paddy field 12, the ions contained in the water permeate into the soil, which is efficient. It did not exterminate or repel harmful snails such as apple snails. However, by uniformly spraying the metal powder 16 that generates copper ions and zinc ions near the
さらに、苗１８の定植時の除草剤１４の散布時に、銅イオン及び亜鉛イオンを発生させる金属部粉１６を除草剤１４に均一に混合して散布すれば、定植後の稲に一番近い位置に銅イオン及び亜鉛イオンが供給され、これによりスクミリンゴガイ等の有害な巻貝の活動場所となる、土中表面に均一に銅イオン及び亜鉛イオンが行き渡り、水田１２全体に効果的にスクミリンゴガイ等の有害な巻貝の食害防止を図ることができる。また、除草剤１４を使わない無農薬栽培においては、除草剤１４の代わりに、水田１２に散布可能な土壌粒や肥料に金属粉１６を均一に混ぜて、定植時に散布すると良く、上記と同様の効果を得ることができる。
Further, when the herbicide 14 at the time of planting the
また、水中有害動物の駆除剤１０の散布により、苗１８の定植後の３週間程度の食害さえ抑えられれば、スクミリンゴガイ等の有害な巻貝は、逆に雑草を食べてくれるので、低農薬でお米を育てられる益虫になるという利点もある。
In addition, if the feeding damage of the
なお、本発明の水中有害動物の駆除方法は、上記実施形態限定されるものではない。例えば、上記駆除剤１０は、銅粉のみまたは亜鉛粉のみでも、散布場所や状況によっては効果的であり、配合割合も適宜設定可能である。また、金属粉と混合する散布剤は、除草剤や土壌粒の他に、肥料やその他農薬に混ぜても良く、適宜選択可能なものである。適用される貝類は、水田や川などに生息する貝類の巻貝又は二枚貝で、上記メカニズムにより駆除可能なものであれば、任意に適用可能である。 The method for exterminating aquatic pests of the present invention is not limited to the above embodiment. For example, the pesticide 10 may be effective only with copper powder or zinc powder depending on the spraying place and situation, and the blending ratio can be appropriately set. The spraying agent to be mixed with the metal powder may be mixed with fertilizers and other pesticides in addition to herbicides and soil grains, and can be appropriately selected. The applicable shellfish are snails or bivalves of shellfish that live in paddy fields and rivers, and can be arbitrarily applied as long as they can be exterminated by the above mechanism.
１０ 駆除剤
１２ 水田
１２ａ 水
１４ 除草剤
１６ 金属粉
１８ 苗
10 Pesticide 12 Paddy field 12a Water 14 Herbicide 16
Claims (2)
前記金属粉は、粒径が６０〜１０００μｍで、銅と亜鉛の配合質量比が８０：２０〜６０：４０であり、
前記水中有害動物は、スクミリンゴガイであり、
前記金属粉の散布は、除草剤に前記金属粉を混ぜて、前記水田の水中で銅イオン濃度が０．００５〜０．００２ｐｐｍ、亜鉛イオン濃度は０．００５〜０．０２ｐｐｍとなるように設定し、前記苗の定植時から３週間までの期間に行い、前記苗の定植時から４週間経過後は散布を行わないことを特徴とする水中有害動物の駆除方法。 Copper powder and metal powder, which is a copper-zinc alloy powder, are sprayed on paddy fields at the time of planting rice seedlings and within a certain period thereafter to elute copper ions and zinc ions from the metal powder, and the copper ions and zinc ions are eluted. It is a method of exterminating aquatic pests that exterminates the pests from the water inhabited by aquatic pests such as winding shells or copper shells by the action of.
The metal powder has a particle size of 60 to 1000 μm and a compounding mass ratio of copper and zinc of 80:20 to 60:40.
The underwater pest is a apple snail,
The metal powder is sprayed by mixing the metal powder with a herbicide so that the copper ion concentration is 0.005 to 0.002 ppm and the zinc ion concentration is 0.005 to 0.02 ppm in the water of the paddy field. A method for exterminating aquatic harmful animals, which is carried out during a period of up to 3 weeks from the time of planting the seedlings, and is not sprayed after 4 weeks have passed from the time of planting the seedlings.
前記金属粉は、粒径が６０〜１０００μｍで、銅と亜鉛の配合質量比が８０：２０〜６０：４０であり、
前記水中有害動物は、スクミリンゴガイであり、
除草剤を散布しない無農薬栽培や減農薬栽培の水田において、
前記金属粉の散布は、肥料及び土壌粒のうちの少なくとも一つに前記金属粉を混ぜて、前記水田の水中で銅イオン濃度が０．００５〜０．００２ｐｐｍ、亜鉛イオン濃度は０．００５〜０．０２ｐｐｍとなるように設定し、前記苗の定植時から３週間までの期間に行い、前記苗の定植時から４週間経過後は散布を行わないことを特徴とする水中有害動物の駆除方法。 Copper powder and metal powder, which is a copper-zinc alloy powder, are sprayed on paddy fields at the time of planting rice seedlings and within a certain period thereafter to elute copper ions and zinc ions from the metal powder, and the copper ions and zinc ions are eluted. It is a method of exterminating aquatic pests that exterminates the pests from the water inhabited by aquatic pests such as winding shells or copper shells by the action of.
The metal powder has a particle size of 60 to 1000 μm and a compounding mass ratio of copper and zinc of 80:20 to 60:40.
The underwater pest is a apple snail,
In pesticide-free and pesticide-reduced paddy fields where herbicides are not sprayed
In the spraying of the metal powder, the metal powder is mixed with at least one of fertilizer and soil grains, and the copper ion concentration is 0.005 to 0.002 ppm and the zinc ion concentration is 0.005 to 0.005 in the water of the paddy field. A method for exterminating aquatic harmful animals, which is set to 0.02 ppm, is carried out during a period of up to 3 weeks from the time of planting the seedlings, and is not sprayed after 4 weeks have passed from the time of planting the seedlings. ..
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