JP2009155202A - Highly dispersive titanium dioxide powder - Google Patents
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本発明は、分散性の高い二酸化チタン粉末に関する。この二酸化チタン粉末は、農園芸用病害防除剤及び農園芸用害虫防除剤として有用である。 The present invention relates to highly dispersible titanium dioxide powder. This titanium dioxide powder is useful as an agricultural and horticultural disease control agent and an agricultural and horticultural pest control agent.
二酸化チタンは、無味無臭の白色の粉末状物質で、ホワイトチョコレートなどの白色着色料として利用されている。この物質の一番の特徴は光触媒機能を持つことである。二酸化チタンに光を照射すると、OHラジカルのような酸化力の強い物質を生成する。この酸化力によって、二酸化チタンは、有害物質を分解したり、あるいは殺菌作用などを発揮する。 Titanium dioxide is a tasteless and odorless white powdery substance, and is used as a white colorant such as white chocolate. The main feature of this material is that it has a photocatalytic function. When titanium dioxide is irradiated with light, it produces substances with strong oxidizing power such as OH radicals. Due to this oxidizing power, titanium dioxide decomposes harmful substances or exerts a bactericidal action.
二酸化チタンの殺菌作用に注目し、この物質を植物の病害防除剤として利用する試みがなされている（特許文献１）。二酸化チタンは、食品の着色料として利用されていることからもわかるように、生物や環境に対して安全性の高い物質であり、この物質を利用することにより、環境に対して悪影響を与えることなく、植物の病害を防除できる可能性がある。 Paying attention to the bactericidal action of titanium dioxide, attempts have been made to use this substance as a plant disease control agent (Patent Document 1). As can be seen from the fact that titanium dioxide is used as a coloring agent for foods, it is a highly safe substance for living organisms and the environment, and the use of this substance has an adverse effect on the environment. There is a possibility that the disease of the plant can be controlled.
二酸化チタンによって圃場内の植物の病害を防除するには、この物質を水などに懸濁させ、その懸濁液を圃場に散布する必要がある。しかし、二酸化チタンの水に対する分散性は低く、水に懸濁させても短時間で沈殿してしまう。分散剤などを添加することにより、懸濁状態を長時間維持することは可能であるが、分散剤の中には環境に悪影響を与えるものもあり、二酸化チタン自体が環境に優しいものであっても、添加する分散剤によって、環境を汚染してしまう可能性がある。このため、分散剤などを用いずに二酸化チタン粉末を水に長時間懸濁させておく方法の開発が望まれていた。 In order to control plant diseases in the field with titanium dioxide, it is necessary to suspend the substance in water and spray the suspension on the field. However, dispersibility of titanium dioxide in water is low, and even if suspended in water, it precipitates in a short time. It is possible to maintain a suspended state for a long time by adding a dispersing agent, etc., but some dispersing agents have an adverse effect on the environment, and titanium dioxide itself is environmentally friendly. However, the added dispersant may contaminate the environment. For this reason, development of the method of suspending titanium dioxide powder in water for a long time without using a dispersing agent etc. was desired.
本発明は、このような技術的背景の下になされたものであり、二酸化チタン粉末を長時間水に懸濁させておく手段を提供することを目的とする。 The present invention has been made under such a technical background, and an object thereof is to provide a means for suspending titanium dioxide powder in water for a long time.
本発明者は、上記課題を解決するため鋭意検討を重ねた結果、二酸化チタン粉末を、市販のオゾン発生装置の放電電極間を通過させることにより、分散性が向上し、長時間懸濁液の状態が維持されることを見出し、この知見に基づいて本発明を完成するに至った。 As a result of intensive studies to solve the above-mentioned problems, the present inventor has improved the dispersibility by passing the titanium dioxide powder between the discharge electrodes of a commercially available ozone generator so that the suspension has a long suspension time. It was found that the state was maintained, and the present invention was completed based on this finding.
即ち、本発明は、以下の（１）〜（５）を提供するものである。
（１）二酸化チタン粉末を放電処理することにより得られる高分散性二酸化チタン粉末。
（２）二酸化チタン粉末を放電処理することを特徴とする高分散性二酸化チタン粉末の製造方法。
（３）（１）記載の高分散性二酸化チタン粉末を水に懸濁させた二酸化チタン懸濁液。
（４）（３）記載の二酸化チタン懸濁液を含有する農園芸用病害防除剤。
（５）（３）記載の二酸化チタン懸濁液を含有する農園芸用害虫防除剤。
That is, the present invention provides the following (1) to (5).
(1) A highly dispersible titanium dioxide powder obtained by subjecting a titanium dioxide powder to a discharge treatment.
(2) A method for producing a highly dispersible titanium dioxide powder, characterized by subjecting the titanium dioxide powder to a discharge treatment.
(3) A titanium dioxide suspension obtained by suspending the highly dispersible titanium dioxide powder described in (1) in water.
(4) An agricultural and horticultural disease control agent comprising the titanium dioxide suspension according to (3).
(5) An agricultural and horticultural pest control agent containing the titanium dioxide suspension according to (3).
本発明は、分散性の高い二酸化チタン粉末を提供する。この二酸化チタン粉末は、分散剤などを添加しなくても、長時間懸濁状態が維持されるため、環境に悪影響を与えることなく、圃場に散布し、植物の病害や害虫の防除に利用できる。 The present invention provides highly dispersible titanium dioxide powder. This titanium dioxide powder is maintained in a suspended state for a long time without adding a dispersant or the like, so that it can be applied to the field without adversely affecting the environment and used for controlling plant diseases and pests. .
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明の高分散性二酸化チタン粉末は、二酸化チタン粉末を放電処理することにより得られるものである。但し、放電処理以外の手段で得られる二酸化チタン粉末であっても、本発明の高分散性二酸化チタン粉末と同様の性質を示すものは、本発明の高分散性二酸化チタン粉末に含まれる。 The highly dispersible titanium dioxide powder of the present invention is obtained by subjecting titanium dioxide powder to a discharge treatment. However, even if the titanium dioxide powder is obtained by means other than the discharge treatment, those showing the same properties as the highly dispersible titanium dioxide powder of the present invention are included in the highly dispersible titanium dioxide powder of the present invention.
放電処理は高分散性の二酸化チタン粉末を生じさせるような処理であれば特に限定されず、例えば、対向した放電電極間に二酸化チタン粉末を置き、電極間に発生する電子流を二酸化チタン粉末に衝突させるような処理を示すことができる。放電電極としては、オゾン発生装置などに使用される無声放電用電極などを例示できる。 The discharge treatment is not particularly limited as long as it produces a highly dispersible titanium dioxide powder. For example, the titanium dioxide powder is placed between opposed discharge electrodes, and the electron flow generated between the electrodes is changed into the titanium dioxide powder. A process that causes a collision can be shown. As a discharge electrode, the electrode for silent discharge used for an ozone generator etc. can be illustrated.
使用する二酸化チタンは、アナターゼ型のものが好ましいが、ルチル型のものであってもよい。 The titanium dioxide to be used is preferably an anatase type, but may be a rutile type.
本発明の高分散性二酸化チタン粉末は、水に長時間懸濁させておくことができ、この懸濁液を圃場等に散布し、農園芸用病害防除剤や農園芸用害虫防除剤として利用することができる。 The highly dispersible titanium dioxide powder of the present invention can be suspended in water for a long time, and the suspension is sprayed on a field or the like and used as an agricultural / horticultural disease control agent or an agricultural / horticultural pest control agent. can do.
散布する懸濁液中の二酸化チタンの量は、対象とする病害や害虫を防除できる範囲内であれば特に限定されないが、通常、1L当たり0.01〜0.5g、好ましくは0.03〜0.1gとする。 The amount of titanium dioxide in the suspension to be sprayed is not particularly limited as long as it is within a range in which the target disease or pest can be controlled, but is usually 0.01 to 0.5 g, preferably 0.03 to 0.1 g per liter.
圃場に散布する懸濁液の量も対象とする病害や害虫を防除できる範囲内であれば特に限定されないが、通常、10a当たり50〜400L、好ましくは100〜300Lとする。 The amount of the suspension sprayed on the field is not particularly limited as long as it is within a range in which the target disease or pest can be controlled, but is usually 50 to 400 L, preferably 100 to 300 L per 10a.
防除対象とする病害としては、キュウリのかっぱん病、べと病、斑点細菌病、灰色カビ病、菌核病、ウドンコ病、ニラの葉枯病、アスパラガスの葉枯病、斑点病、茎枯病、トマトの灰色カビ病、菌核病、葉カビ病、イチゴの灰色カビ病、葉枯炭そ病、葉枯病、輪斑病、ウドンコ病、メロンのべと病、斑点細菌病、灰色カビ病などを挙げることができるが、これらに限定されるわけではない。 Diseases to be controlled include cucumber bite disease, downy mildew, spotted bacterial disease, gray mold disease, mycorrhizal disease, powdery mildew, leek leaf blight, asparagus leaf blight, spot disease, stem Blight, tomato gray mold, mycorrhizal disease, leaf mold, strawberry gray mold, leaf anthracnose, leaf blight, ring spot, powdery mildew, melon downy mildew, spot bacterial disease, Although gray mold disease etc. can be mentioned, it is not necessarily limited to these.
防除対象とする害虫としては、アブラムシ、シルバーリーフコナジラミ、ダニ、スリップスなどを挙げることができるが、これらに限定されるわけではない。 Examples of pests to be controlled include, but are not limited to, aphids, silver leaf whiteflies, ticks and slips.
散布方法は特に限定されず、通常の農薬と同様に散布することができるが、シルバーリーフコナジラミのように葉の裏に寄生する害虫を防除する場合は、静電噴霧器を用いるのが好ましい。 The spraying method is not particularly limited and can be sprayed in the same manner as ordinary agricultural chemicals. However, when controlling pests parasitic on the back of leaves such as silver leaf whitefly, it is preferable to use an electrostatic sprayer.
以下、実施例により本発明を更に詳細に説明する。 Hereinafter, the present invention will be described in more detail with reference to examples.
〔実施例１〕 高分散性二酸化チタン粉末の製造及びその分散性の確認
市販のオゾン発生装置（製造元：シルバー精工株式会社、型式名：ZN300）の本体カバーを取り外し、内部の電極部を露出させた。この装置の電極部は、四箇所の空隙部分を持つ棚状の構造をとる（図１）。
[Example 1] Production of highly dispersible titanium dioxide powder and confirmation of its dispersibility Remove the main body cover of a commercially available ozone generator (manufacturer: Silver Seiko Co., Ltd., model name: ZN300) to expose the internal electrode part. It was. The electrode part of this device has a shelf-like structure with four gaps (FIG. 1).
オゾン発生装置の電源を入れた状態で、市販の二酸化チタン粉末（販売元：白石工業（株））を電極部の空隙部分に入れ、空隙部分を通過させた。空隙部分を通過させた後の二酸化チタン粉末6gを、100mlの工業用精製水に懸濁させた。また、この懸濁液を工業用精製水で1000倍に希釈した懸濁液も調製した。これらの懸濁液を静置し、沈殿が生じるかどうかを観察した。比較のため、上述した放電処理を行わない二酸化チタン粉末の懸濁液も同様に観察した。 With the ozone generator powered on, a commercially available titanium dioxide powder (distributor: Shiroishi Kogyo Co., Ltd.) was placed in the gap portion of the electrode portion and allowed to pass through the gap portion. 6 g of titanium dioxide powder after passing through the void was suspended in 100 ml of industrial purified water. A suspension was also prepared by diluting this suspension 1000 times with industrial purified water. These suspensions were allowed to stand and observed for precipitation. For comparison, a suspension of titanium dioxide powder not subjected to the above-described discharge treatment was also observed in the same manner.
実験開始直後、約2分後、約30分後、及び約20時間後の懸濁液の状態をそれぞれ図２、図３、図４、及び図５に示す。図中の4本のボトルは、左から順に、放電処理を行わなかった二酸化チタン粉末の1000倍希釈懸濁液、放電処理を行った二酸化チタン粉末の1000倍希釈懸濁液、放電処理を行わなかった二酸化チタン粉末の懸濁液、放電処理を行った二酸化チタン粉末の懸濁液である。なお、放電処理を行わなかった二酸化チタン粉末は、工業用精製水に添加しただけでは懸濁しなかったので、ボトルを強く振り、強制的に懸濁させた。 The state of the suspension immediately after the start of the experiment, after about 2 minutes, after about 30 minutes, and after about 20 hours is shown in FIG. 2, FIG. 3, FIG. 4, and FIG. The four bottles in the figure are, in order from the left, 1000-fold diluted suspension of titanium dioxide powder not subjected to discharge treatment, 1000-fold diluted suspension of titanium dioxide powder subjected to discharge treatment, and discharge treatment. This is a suspension of titanium dioxide powder that was not present, and a suspension of titanium dioxide powder that was subjected to discharge treatment. In addition, since the titanium dioxide powder not subjected to the discharge treatment was not suspended only by adding it to industrial purified water, the bottle was strongly shaken to suspend it.
放電処理を行わなかった二酸化チタン粉末は、実験開始から2分後に既に沈殿が始まっており、実験開始から20時間後にはほぼ完全に沈殿と上清とに分離していた。これに対し、放電処理を行った二酸化チタン粉末は、実験開始から20時間たっても懸濁状態が維持されていた。このことから、二酸化チタン粉末に放電処理を行うことにより、粉末の分散性が向上することがわかった。 The titanium dioxide powder not subjected to the discharge treatment had already started to precipitate 2 minutes after the start of the experiment, and almost completely separated into a precipitate and a supernatant 20 hours after the start of the experiment. In contrast, the titanium dioxide powder subjected to the discharge treatment was maintained in a suspended state even after 20 hours from the start of the experiment. From this, it was found that the dispersibility of the powder was improved by performing a discharge treatment on the titanium dioxide powder.
〔比較例１〕 セラミックス粉末及び炭酸カルシウム粉末の分散性の確認
二酸化チタン粉末の代わりにセラミックス粉末（佐賀県立窯業試験研究センターより、サンプル提供を受ける。）及び炭酸カルシウム粉末（販売元：白石カルシウム（株））を用い、実施例１と同様に放電処理及び懸濁液の観察を行った。
[Comparative Example 1] Confirmation of Dispersibility of Ceramic Powder and Calcium Carbonate Powder Ceramic powder (received samples from Saga Prefectural Ceramics Research Center) and calcium carbonate powder (distributor: Calcium Shiraishi ( In the same manner as in Example 1, the discharge treatment and the suspension were observed.
実験開始直後及び約2分後の懸濁液の状態をそれぞれ図６及び図７に示す。図中の4本のボトルは、左から順に、放電処理を行ったセラミックス粉末の懸濁液、放電処理を行わなかったセラミックス粉末の懸濁液、放電処理を行った炭酸カルシウム粉末の懸濁液、放電処理を行わなかった炭酸カルシウム粉末の懸濁液である。なお、セラミックス粉末及び炭酸カルシウム粉末は、工業用精製水に添加しただけでは懸濁しなかったので、沈殿速度を見るために、加振や撹拌により強制的に懸濁させた。 The state of the suspension immediately after the start of the experiment and after about 2 minutes is shown in FIGS. 6 and 7, respectively. The four bottles in the figure are, in order from the left, a suspension of ceramic powder that has undergone discharge treatment, a suspension of ceramic powder that has not undergone discharge treatment, and a suspension of calcium carbonate powder that has undergone discharge treatment. This is a suspension of calcium carbonate powder that was not subjected to discharge treatment. The ceramic powder and calcium carbonate powder did not suspend when they were added to industrial purified water, so they were forcibly suspended by shaking or stirring in order to see the precipitation rate.
放電処理の有無にかかわらずセラミックス粉末及び炭酸カルシウム粉末は、実験開始から2分後に沈殿が始まっており、放電処理による分散性の改善はみられなかった。 Regardless of the presence or absence of the discharge treatment, the ceramic powder and calcium carbonate powder began to precipitate 2 minutes after the start of the experiment, and no improvement in dispersibility was observed due to the discharge treatment.
〔比較例２〕 卵殻粉末及び焼成骨粉の分散性の確認
二酸化チタン粉末の代わりに卵殻粉末（販売元：（有）グリーンテクノ２１）及び焼成骨粉（販売元：（株）エクセラ）を用い、実施例１と同様に放電処理及び懸濁液の観察を行った。
[Comparative Example 2] Confirmation of dispersibility of eggshell powder and calcined bone powder Using eggshell powder (distributor: Green Techno 21) and calcined bone powder (distributor: Excella) instead of titanium dioxide powder In the same manner as in Example 1, the discharge treatment and the suspension were observed.
実験開始直後及び約2分後の懸濁液の状態をそれぞれ図８及び図９に示す。図中の4本のボトルは、左から順に、放電処理を行った卵殻粉末の懸濁液、放電処理を行わなかった卵殻粉末の懸濁液、放電処理を行った焼成骨粉の懸濁液、放電処理を行わなかった焼成骨粉の懸濁液である。なお、卵殻粉末及び焼成骨粉は、工業用精製水に添加しただけでは懸濁しなかったので、沈殿速度を見るために、加振や撹拌により強制的に懸濁させた。 The state of the suspension immediately after the start of the experiment and after about 2 minutes is shown in FIGS. 8 and 9, respectively. The four bottles in the figure are, in order from the left, a suspension of eggshell powder that has undergone discharge treatment, a suspension of eggshell powder that has not undergone discharge treatment, a suspension of calcined bone meal that has undergone discharge treatment, It is a suspension of calcined bone powder that has not been subjected to discharge treatment. In addition, since eggshell powder and calcined bone powder were not suspended only by adding to industrial purified water, they were forcibly suspended by shaking or stirring in order to observe the precipitation rate.
放電処理の有無にかかわらず卵殻粉末及び焼成骨粉は、実験開始から2分後に沈殿が始まっており、放電処理による分散性の改善はみられなかった。 Regardless of whether or not the discharge treatment was performed, the eggshell powder and the calcined bone powder began to precipitate 2 minutes after the start of the experiment, and no improvement in dispersibility was observed due to the discharge treatment.
以上の結果から、上述した放電処理による分散性の改善は、二酸化チタン粉末にのみみられ、他の粉末状物質にはみられなかった。二酸化チタンは、他の粉末状物質にはない光触媒性という性質を持っており、この性質が放電処理による分散性の改善と関係することが推測された。 From the above results, the improvement in dispersibility by the above-described discharge treatment was observed only in the titanium dioxide powder, but not in other powdery substances. Titanium dioxide has a photocatalytic property that is not found in other powdered substances, and it was speculated that this property is related to improvement in dispersibility by electric discharge treatment.
〔試験例１〕 キュウリのかっぱん病感染防止効果試験
かっぱん病が発生したキュウリ圃場に二酸化チタン懸濁液を散布し（散布日：2003年12月18日）、かっぱん病の感染防止効果を調べた。
[Test Example 1] Cucumber infection prevention test of cucumber Titanium dioxide suspension was sprayed on the cucumber field in which cucumber disease occurred (spraying date: December 18, 2003), and infection prevention effect of cucumber disease I investigated.
二酸化チタン懸濁液は、200mlの工業用精製水に、実施例１に記載した方法で製造した高分散性二酸化チタン粉末12gを加え、更に展着剤としてミックスパワー（登録商標、製造元：シンジェンタ）を100cc加え、これを水道水で1000倍に希釈して調製した。散布量は、圃場10a当たり、200Lとした。 Titanium dioxide suspension is obtained by adding 12 g of highly dispersible titanium dioxide powder produced by the method described in Example 1 to 200 ml of industrial purified water, and mix power (registered trademark, manufacturer: Syngenta) as a spreading agent. 100 cc was added and diluted 1000 times with tap water. The amount of application was 200 L per field 10a.
また、比較のため二酸化チタン懸濁液の代わりに水道水を用いて、同様に散布した。 Further, for comparison, tap water was used instead of the titanium dioxide suspension, and sprayed in the same manner.
二酸化チタン懸濁液を散布した場合（試験区）及び水道水を散布した場合（対照区）のかっぱん病の発生率（散布後、新葉への感染率を％で表したものである。）を表１に示す。 The incidence of gonorrhea in the case where the titanium dioxide suspension is sprayed (test group) and in the case where tap water is sprayed (control group) (the infection rate of new leaves after spraying is expressed in%. ) Is shown in Table 1.
〔試験例２〕 アスパラガスの茎枯れ病予防効果試験
過去に茎枯れ病が発生したことがあるアスパラガス圃場の土壌表面に二酸化チタン懸濁液を散布し（散布日：2004年1月20日）、茎枯れ病の予防効果を調べた。
[Test Example 2] Stem blight prevention effect test of asparagus A titanium dioxide suspension was sprayed on the soil surface of an asparagus field where stem blight had occurred in the past (spreading date: January 20, 2004) ), The preventive effect of stem blight was investigated.
二酸化チタン懸濁液の調製は試験例１と同様に行った。散布量は、圃場10a当たり200Lとした。試験例１と同様に、二酸化チタン懸濁液の代わりに水道水を散布し、その効果を比較した。 The titanium dioxide suspension was prepared in the same manner as in Test Example 1. The amount of application was 200 L per field 10a. As in Test Example 1, tap water was sprayed instead of the titanium dioxide suspension, and the effects were compared.
二酸化チタン懸濁液を散布した場合（試験区）及び水道水を散布した場合（対照区）の茎枯れ病の発生数（圃場5a当たり茎枯れ病を発生したアスパラガスの数）を表２に示す。 Table 2 shows the number of stem blight diseases (number of asparagus that caused stem blight per field 5a) when the titanium dioxide suspension was sprayed (test zone) and when tap water was sprayed (control zone). Show.
〔試験例３〕 トマトの灰色カビ病予防効果試験
過去に灰色カビ病発生したことがあるトマト圃場に二酸化チタン懸濁液を散布し（散布日：2005年2月10日）、灰色カビ病の予防効果を調べた。
[Test Example 3] Tomato gray mold disease prevention effect test Tomato field where gray mold disease has occurred in the past was sprayed with titanium dioxide suspension (spraying date: February 10, 2005). The preventive effect was examined.
二酸化チタン懸濁液の調製は試験例１と同様に行った。散布量は、圃場10a当たり200Lとした。試験例１と同様に、二酸化チタン懸濁液の代わりに水道水を散布し、その効果を比較した。 The titanium dioxide suspension was prepared in the same manner as in Test Example 1. The amount of application was 200 L per field 10a. As in Test Example 1, tap water was sprayed instead of the titanium dioxide suspension, and the effects were compared.
二酸化チタン懸濁液を散布した場合（試験区）及び水道水を散布した場合（対照区）の灰色カビ病の発生数（圃場5a当たり灰色カビ病を発生したトマト果実の個数）を表３に示す。 Table 3 shows the number of gray mold diseases (number of tomato fruits with gray mold disease per field 5a) when the titanium dioxide suspension was sprayed (test zone) and when tap water was sprayed (control zone). Show.
〔試験例４〕 イチゴの葉枯炭そ病感染抑制効果試験
葉枯炭そ病が発生しているイチゴ圃場に二酸化チタン懸濁液を散布し（散布日：2004年8月5日）、葉枯炭そ病の感染抑制効果を調べた。
[Test Example 4] Strawberry Anthracnose Infection Inhibition Effect Test Titanium dioxide suspension is sprayed on the strawberry field where leaf anthracnose is occurring (spraying date: August 5, 2004), leaves The infection control effect of the anthracnose was investigated.
二酸化チタン懸濁液の調製は試験例１と同様に行った。散布量は、圃場10a当たり100Lとした。試験例１と同様に、二酸化チタン懸濁液の代わりに水道水を散布し、その効果を比較した。 The titanium dioxide suspension was prepared in the same manner as in Test Example 1. The amount of application was 100 L per field 10a. As in Test Example 1, tap water was sprayed instead of the titanium dioxide suspension, and the effects were compared.
二酸化チタン懸濁液を散布した場合（試験区）及び水道水を散布した場合（対照区）の葉枯炭そ病の発生率（全イチゴ個体中で新葉が葉枯炭そ病に感染した個体の割合）を表４に示す。 Incidence of leaf anthracnose when titanium dioxide suspension was sprayed (test zone) and when tap water was sprayed (control zone) (new leaves were infected with leaf anthracnose in all strawberry individuals) Table 4 shows the ratio of individuals.
〔試験例５〕 アブラムシに対する防除効果試験
雑草に寄生しているアブラムシに二酸化チタン懸濁液を散布し（散布日：2005年4月19日）、アブラムシに対する防除効果を調べた。
[Test Example 5] Control effect test against aphids Titanium dioxide suspension was sprayed on aphids parasitic on weeds (spraying date: April 19, 2005), and the control effect on aphids was examined.
二酸化チタン懸濁液の調製は試験例１と同様に行った。散布量は、圃場10a当たり150Lとした。試験例１と同様に、二酸化チタン懸濁液の代わりに水道水を散布し、その効果を比較した。 The titanium dioxide suspension was prepared in the same manner as in Test Example 1. The amount of application was 150 L per field 10a. As in Test Example 1, tap water was sprayed instead of the titanium dioxide suspension, and the effects were compared.
二酸化チタン懸濁液を散布した場合（試験区）及び水道水を散布した場合（対照区）のアブラムシの生存数を表５に示す。 Table 5 shows the number of aphids that survived when the titanium dioxide suspension was sprayed (test group) and when tap water was sprayed (control group).
〔試験例６〕 シルバーリーフコナジラミに対する防除効果試験
ナスの葉裏に寄生しているシルバーリーフコナジラミに二酸化チタン懸濁液を散布し（散布日：2004年5月16日）、シルバーリーフコナジラミに対する防除効果を調べた。
[Test Example 6] Silver leaf whitefly control effect test Silver leaf whitefly parasitic on the back of the eggplant is sprayed with titanium dioxide suspension (spraying date: May 16, 2004) to control silver leaf whitefly The effect was investigated.
散布に使用した二酸化チタン懸濁液は、まず、実施例１に記載した方法で製造した高分散性二酸化チタン粉末を工業用精製水に加え、6wt％程度の懸濁液を調製し、この懸濁液150mlをミックスパワー（登録商標）50cc及びモスピラン（登録商標、製造元：日本曹達（株））100gと共に水道水に加えて調製した。この懸濁液を噴霧機の専用タンクに入れ、全量が10Lになるように水道水を加え希釈した。散布は、市販の静電噴霧機（製造元：株式会社マリックス、型式名：BP-2.5）を用いて行い、散布量は圃場10a当たり5Lとした。 The titanium dioxide suspension used for spraying was prepared by adding the highly dispersible titanium dioxide powder produced by the method described in Example 1 to industrial purified water to prepare a suspension of about 6 wt%. A 150 ml suspension was prepared by adding 50 cc of Mix Power (registered trademark) and 100 g of Mospiran (registered trademark, manufacturer: Nippon Soda Co., Ltd.) to tap water. This suspension was put into a dedicated tank of a sprayer, and diluted with tap water so that the total volume became 10 L. The spraying was performed using a commercially available electrostatic sprayer (manufacturer: Marix Corporation, model name: BP-2.5), and the spraying amount was 5 L per 10a of the field.
試験例１と同様に、二酸化チタン懸濁液の代わりに水道水を散布し、その効果を比較した。 As in Test Example 1, tap water was sprayed instead of the titanium dioxide suspension, and the effects were compared.
二酸化チタン懸濁液を散布した場合（試験区）及び水道水を散布した場合（対照区）のシルバーリーフコナジラミの生存数を表６に示す。 Table 6 shows the survival number of silver leaf whiteflies when the titanium dioxide suspension is sprayed (test group) and when tap water is sprayed (control group).
〔試験例７〕 ダニに対する防除効果試験
イチゴの葉裏に寄生しているダニに二酸化チタン懸濁液を散布し（散布日：2004年4月25日）、ダニに対する防除効果を調べた。
[Test Example 7] Test of control effect on mites Titanium dioxide suspension was sprayed on mites parasitizing the leaves of strawberries (spraying date: April 25, 2004), and the control effect on mites was examined.
散布に使用した二酸化チタン懸濁液は、まず、実施例１に記載した方法で製造した高分散性二酸化チタン粉末を工業用精製水に加え、6wt％程度の懸濁液を調製し、この懸濁液150mlをミックスパワー（登録商標）50ccと共に水道水に加えて調製した。この懸濁液を噴霧機の専用タンクに入れ、全量が10Lになるように水道水を加え希釈した。散布は、市販の静電噴霧機（製造元：株式会社マリックス、型式名：BP-2.5）を用いて行い、散布量は圃場10a当たり5Lとした。 The titanium dioxide suspension used for spraying was prepared by adding the highly dispersible titanium dioxide powder produced by the method described in Example 1 to industrial purified water to prepare a suspension of about 6 wt%. A 150 ml suspension was prepared by adding 50 cc of MixPower (registered trademark) to tap water. This suspension was put into a dedicated tank of a sprayer, and diluted with tap water so that the total volume became 10 L. The spraying was performed using a commercially available electrostatic sprayer (manufacturer: Marix Corporation, model name: BP-2.5), and the spraying amount was 5 L per 10a of the field.
試験例１と同様に、二酸化チタン懸濁液の代わりに水道水を散布し、その効果を比較した。 As in Test Example 1, tap water was sprayed instead of the titanium dioxide suspension, and the effects were compared.
二酸化チタン懸濁液を散布した場合（試験区）及び水道水を散布した場合（対照区）のダニの生存数を表７に示す。 Table 7 shows the number of surviving ticks when the titanium dioxide suspension was sprayed (test group) and when tap water was sprayed (control group).
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