JP4603663B2 - Seed disinfectant for high concentration dilution - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、ペンタ−４−エニル＝Ｎ−フルフリル−Ｎ−イミダゾール−１−イルカルボニル−ＤＬ−ホモアラニナ−ト（以下「ペフラゾエート」という。）を含有する高濃度希釈用の種子消毒用水和剤の改良技術に関する。
【０００２】
【従来の技術】
種子消毒剤は、農薬活性成分、界面活性剤及びクレーなどの増量剤からなる粉状の水和剤が広く用いられている。使用に際しては、この水和剤を水で２０〜２００倍に希釈して、この希釈液に種籾を浸漬する方法が一般的に行われている。また、最近では、大量の種子を省力的に消毒するための方法として、水和剤を水で、３〜２０倍に希釈した、いわゆる高濃度希釈液とし、乾燥種籾重量の３％相当量の高濃度希釈液を種子消毒用吹き付け装置を用いて種子に吹き付ける方法が普及してきている。
この高濃度希釈液の吹き付処理方法は種籾に対する薬液処理量が少量であるため種籾に対して、種子消毒効果を十分に発揮するだけの薬剤付着性が求められる。
しかしながら、これまでの高濃度希釈用の種子消毒剤では、必ずしも十分な付着量が得られず、種子消毒効果も十分とはいえない状況が発生している。
【０００３】
また、本発明は製剤を水溶性フィルムで包装して用いることに特徴があるが、水和剤を水溶性フィルムで包装して使用時に水で４００〜３０００倍に希釈して植物の茎葉や害虫等に撒布する方法が知られている。またその他に、例えば、水中で又は水面で容易に分解又は溶解する固形の農薬製剤を、水で破袋分散又は溶解するシートに包んだ形態で発泡剤又は浮力向上剤を含有してもよい農薬組成物、発泡剤を含有する錠剤形態の農薬組成物、浮力向上剤を含有する錠剤形態の農薬組成物及びそれら農薬組成物を水田へ投げ込む農薬の処理方法に関するものとして特開平４−２２６９０１号公報記載の技術が知られている。
【０００４】
また、水溶性フィルムで包装した水面展開性農薬製剤包装体を水田等の水系に投げ込むことにより簡便に薬剤処理する方法に関するものとして特開平５−７８２０７号公報記載の技術が知られている。さらに、有害生物防除活性成分又は食物成長調節活性成分である農薬活性成分の１種以上を含有し、見かけ密度が１ｇ／ｃｍ3未満である水和剤及び／又は顆粒状水和剤に重りが添加されてなる組成物が水溶性フィルムに内包されており、かつ該水溶性フィルム内の組成物の見かけ密度が１ｇ／ｃｍ3以上であることを特徴とする包装農薬製剤に関するものとして特開平５−３１０５０２号公報記載の技術が知られている。またさらに、農薬水和剤又は顆粒状水和剤が水溶性基材で包装されてなる農薬製剤であって、該水溶性基材が気体は通過するが農薬水和剤、顆粒状水和剤は通過し得ない大きさの穴を有することを特徴とする、水希釈時の薬剤の水没時間の早い包装農薬製剤に関するものとして特開平８−２４５３０７号公報記載の技術が知られている。
【０００５】
しかし、いずれも水溶性フィルムでの包装袋を水で２００倍〜２０００倍に希釈して用いる通常の濃度の希釈液を撒布して使用するための技術、あるいは、包装袋そのものを田面水中へ投入するための技術であり、水で３〜２０倍に高濃度希釈して用いる製剤を水溶性フィルムで包装すること、および、その水溶性フィルム包装袋の高濃度種子消毒剤としての適用性や種籾に対する薬剤の付着性に関する報告、研究はいまだなされておらず、また、従来の技術知見をもってしてもまだ十分ではないのが現状である。
【０００６】
【発明が解決しようとする課題】
これまでの高濃度希釈用種子消毒剤は種子に対する薬剤の付着性が十分とはいえなかった。したがって、これらの問題のない種子消毒剤の開発が望まれている。また、種子消毒用の高濃度薬液を調製するときに大量の粉状の水和剤を扱うため、作業時に粉立ちが著しく、作業性が悪く、また作業者への薬剤の被爆などの安全性にも問題があり、改善が求められている。
このような状況の中で、本発明の目的は、種子への薬剤の付着性のよい、また、高濃度薬剤調製時に、水和剤の粉立ちがなく、作業性、安全性に問題がない高濃度希釈用の種子消毒製剤を提供することにある。
【０００７】
【課題を解決するための手段】
本発明者らは、これらの課題を解決すべく鋭意検討した。その結果、下記の化学構造式からなるペフラゾエート含有の種子消毒剤を含み、この高濃度希釈用の種子消毒用水和剤を水溶性フィルムで包装した製剤が種籾への付着性が高く高濃度希釈用の種子消毒剤として有用であるとの知見を得た。
【０００８】
【化１】
この水溶性フィルムで包装された種子消毒用水和剤は、水中へそのまま投入すればよく、あとは通常の撹拌により混合すればよい。このとき薬剤は水溶性フィルムで包装されているので、粉立ちがなく作業性、安全性に優れている。そして、特に種籾への薬剤の付着効率が大きく改善され、種子消毒効果低下などの問題もなく、安心して種子消毒ができる。
【００１０】
【発明の実施の形態】
以下に本発明に係る高濃度希釈用種子消毒製剤の実施の形態について、説明する。
まず、本発明の種子消毒用薬剤を包装するための水溶性フィルムによる包装体について具体的に説明する。
【００１１】
本発明で使用される水溶性フィルムとは、水に溶解して包装袋としての一定の強度を持つものであればよく、フィルムの材質は内容物である種子消毒用薬剤との化学的、物理的な安定性の面で適合するものを選べばよい。水溶性フィルムとしては、天然水溶性高分子、合成水溶性高分子、半合成水溶性高分子からなるフィルムが有効に使用される。その例としては次のものが挙げられるが、これらに限定されるものではなく、また、これらの１種又は２種以上を貼り合わせるなどして併用してもよい。
▲１▼ 天然水溶性高分子の例
デンプン、アルギン酸ナトリウム、キサンタンガム、プルランなど。
▲２▼ 合成水溶性高分子の例
ポリビニルアルコール、ポリアクリル酸ナトリウム、ポリエチレンオキシド、ポリビニルピロリドンなど。
▲３▼ 半合成水溶性高分子の例
ヒドロキシエチルセルロース、カルボキシメチルセルロースなど。
【００１２】
水溶性フィルムの厚さは内容物の量とフィルムの強度の関係より選べばよく、通常、２０μｍ〜６０μｍのものが使用される。
水溶性フィルムが薄い場合、水希釈液中での水溶性フィルム量が少なくなり、種子への薬剤付着量が少なくなる。水溶性フィルムが厚い場合は、水希釈液中での水溶性フィルム量が多くなり、種子への良好な付着量が得られることが期待されるが、実際には、水希釈液中で薬剤の凝集が起こり、吹付け処理ができなくなる。また、希釈倍率が高い場合は、水希釈液中で水溶性フィルム量が少なくなり、種子への薬剤付着量が少なくなる。希釈倍率が低い場合は、水希釈液中での水溶性フィルム量が多くなり、種子への良好な付着量が得られることが期待されるが、実際には、水希釈液中での薬剤の凝集が起こり、吹付け処理ができなくなる。
【００１３】
よって、水溶性フィルムの使用量は、内容物の種子消毒用薬剤１重量部に対し０．００６重量部〜０．０６重量部相当の範囲で使用することが重要である。この範囲で、薬剤の粉立ちを防止するとともに薬剤の種子への良好な付着性が得られる。水溶性フィルムの量が０．００６重量倍より少ないと、種子への薬剤付着量が少なくなり、０．０６重量部より多いと水での希釈薬液中で薬剤の凝集が起こり、吹付け処理ができなくなる。
【００１４】
次に、本発明に使用される種子消毒用薬剤は、通常種子への吹き付装置を使用して種子消毒するのに用いられる種子消毒用水和剤であればよく、それらの農薬活性成分としては、例えば次のようなものが挙げられる。
種子消毒用殺菌成分
ベノミル、チアベンダゾール、チオファネートメチル、チウラム、プロクロラズトリフミゾ−ル、イプコナゾール、塩基性塩化銅、水酸化第二銅など。
種子消毒用殺虫成分
フェニトロチオンなど。
なお、これら農薬活性成分名は「農薬ハンドブック」（１９９８年１２月１５日、社団法人日本植物防疫協会発行）に記載の化合物である。
【００１５】
本発明の水溶性フィルムで包装された高濃度希釈用種子消毒剤の包装体の調製方法は、特に限定されるものではないが、次のような方法で調製することができる。例えば、前述に種子消毒用の農薬活性成分、界面活性剤、増量剤などから、水で３〜２０倍に希釈して使用する、高濃度希釈用の種子消毒用水和剤を調製する。こうして得た水和剤の１ｋｇに対し重量で６ｇ〜６０ｇ相当の水溶性フィルムで包装すれば、本発明の高濃度希釈用の種子消毒用製剤を得ることができる。
【００１６】
本発明の高濃度希釈用の水和剤を調製するのに使用される海面活性剤としては非イオン性界面活性剤、陰イオン性界面活性剤、陽イオン性界面活性剤、両性界面活性剤などがある。
非イオン界面活性剤の例としては、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルアリールエーテル、ポリオキシエチレンスチリルフェニルエーテル、ポリオキシエチレンアルキルエステル、ポリオキシエチレンソルビタンアルキレート、ポリオキシエチレンフェニルエーテルポリマー、ポリオキシエチレンアルキレンアリールフェニルエーテル、ポリオキシエチレンアルキレングリコール、ポリオキシエチレン、ポリオキシプロピレンブロックポリマーなどを挙げることができる。
【００１７】
陰イオン界面活性剤の例としては、リグニンスルホン酸塩、アルキルアリールスルホン酸塩、ジアルキルスルホサクシネート、ポリオキシエチレンアルキルアリールエーテルサルフェート、アルキルナフタレンスルホン酸塩、ポリオキシエチレンスチリルフェニルエーテルサルフェート、ラウリル硫酸塩などを挙げることができる。
陽イオン界面活性剤としては、アルキルアミン塩を挙げることができる。
両性界面活性剤としては、アミドベタイン型、イミダザリン型などを挙げることができる。
なお、本発明で使用することのできる界面活性剤は、これらの例示されたものに限られるものではない。
【００１８】
また、本発明に係る種子消毒用製剤を水和剤として調製するために増量剤が使用される。その例としては、クレー、タルク、ベントナイト、炭酸カルシウム、ホワイトカーボン、ショ糖、乳糖、珪藻土、硫酸アンモニウム、硫酸ナトリウムなどが挙げられる。そして、これらは単独で使用される他２種以上を混合して使用することができる。
また、その他の補助剤として、種子消毒活性成分の経時的安定化剤、消泡剤などを必要により添加して製剤化することもできる。
【００１９】
【実施例】
次に以下の実施例で本発明をさらに具体的に説明するが、本発明はこれらに限定されるものではない。なお、部とあるのはすべて重量部を意味する。また（ ）内の部は高濃度希釈種子消毒剤１部に対する水溶性フィルムの添加割合を示す。
【００２０】
実施例１
ペフラゾエート２０部、チウラム２０部、ポリオキシエチレンスチリルフェニルエーテル１０部、β−ナフタレンスルホン酸ホルマリン縮合物のナトリウム塩５部、ホワイトカーボン２０部、乳糖１５部、及びクレー１０部をハンマーミル（不二パウダル株式会社製）で粉砕混合し水和剤を調製した。この水和剤１３３．３ｇを厚さ４０μｍ、重さで１．６ｇ（０．０１２部）相当量の水溶性ポリビニルアルコール製フィルムで封筒状に包装し、本発明の高濃度希釈用種子消毒水和剤を得た。
【００２１】
実施例２
ペフラゾエート２０部、ポリオキシエチレンスチリルフェニルエーテル５部、リグニンスルホン酸ナトリウム５部、ホワイトカーボン２０部、ショ糖５０部をハンマーミルで粉砕混合し水和剤を調製し、この水和剤１３３．３ｇを厚さ２０μｍ、重さで０．８ｇ（０．００６部）相当量の水溶性ポリビニルアルコール製フィルムで封筒状に包装し、本発明の高濃度希釈用種子消毒水和剤を得た。
【００２２】
実施例３
ペフラゾエート２０部、チウラム２０部、ポリオキシエチレンスチリルフェニルエーテル１０部、β−ナフタンレンスルホン酸ホルマリン縮合物のナトリウム塩５部、ホワイトカーボン２０部、乳糖１５部、クレー１０部をハンマーミルで混合粉砕し水和剤を調製した。この水和剤１３３．３ｇを厚さ２０μｍ、重さで２．６ｇ（０．０１９５部）相当量の水溶性ポリビニルアルコール製フィルムで封筒状に包装し本発明の高濃度希釈用種子消毒水和剤を得た。
【００２３】
実施例４
実施例３の水溶性ポリビニルアルコール製フィルムの厚さを２０μｍを４０μｍに代えて製剤１３３．３ｇ当りのフィルム重量を２．６ｇ（０．０１９５部）から７．８ｇ（０．０５８５部））に代えた以外は、実施例３と同様の高濃度希釈用種子消毒水和剤を得た。
【００２４】
実施例５
実施例１の水溶性ポリビニルアルコール製フィルム（厚さ４０μｍ、製剤１３３．３ｇ当たりのフィルム重量１．６ｇ（０．０１２部）をプルラン（厚さ２０μｍ、製剤１３３．３ｇ当たりのフィルム重量０．８ｇ（０．００６部））に代えた以外は、実施例１と同様の高濃度希釈用種子消毒製剤を得た。
【００２５】
実施例６
実施例２の水溶性ポリビニルアルコール製フィルム（厚さ２０μｍ、製剤１３３．３ｇ当たりのフィルム重量０．８ｇ（０．００６０部））をプルラン（厚さ３０μｍ、製剤１３３．３ｇ当たりのフィルム重量１．０ｇ（０．００７５部））に代えた以外は、実施例２と同様の高濃度希釈用種子消毒製剤を得た。
【００２６】
比較例１
実施例１と同様であるが、水溶性フィルムで包装していない水和剤を得た。
比較例２
実施例２と同様であるが、水溶性フィルムで包装していない水和剤を得た。
比較例３
実施例３と同様であるが、水溶性フィルムで包装していない水和剤を得た。
【００２７】
比較例４
実施例１の水溶性ポリビニルアルコール製フィルム（厚さ４０μｍ、製剤１３３．３ｇ当たりのフィルム重量１．６ｇ（０．０１２部））を厚さ２０μｍ、製剤１３３．３ｇ当たりのフィルム重量を０．６ｇ（０．００４５部）に代えた以外は、実施例１と同様の高濃度希釈用種子消毒製剤を得た。
【００２８】
比較例５
実施例３の水溶性ポリビニルアルコール製フィルム（厚さ２０μｍ、製剤１３３．３ｇ当たりのフィルム重量２．６ｇ（０．０１９５部））を厚さ６０μｍ、製剤１３３．３ｇ当たりのフィルム重量を８．５ｇ（０．０６３８部）に代えた以外は、実施例３と同様の高濃度希釈用種子消毒製剤を得た。
【００２９】
ここで、本発明に係る高濃度希釈用種子消毒製剤の付着性、分散性、及び防除効果を以下の試験例１〜３によって示し、本発明の有用性をさらに明らかにする。
【００３０】
試験例１（種籾への付着量試験）
イネばか苗病自然感染罹病籾（品種：「日本晴」）の乾燥種籾１５０ｇ）に対し、実施例１に準じて調製した高濃度希釈用の種子消毒用水和剤を水で所定の濃度になるように希釈した薬液あるいは、水溶性フィルムで包装していない種子消毒剤を水で希釈した。薬液の４．５ｍｌ（乾燥種籾重量の３％相当量）を種籾に対し均一に付着するようにエアースプレーガン（Ｆ８８型、明治機械製作所製）を用いて吹き付けた。この薬液処理後の種籾の一部（１０ｇ）より、農薬活性成分を抽出しＨＰＬＣ（高速液体クロマトグラフ）で分析して、薬剤の種籾に対する付着量を算出した。
【００３１】
試験例２（水中分散性試験）
１０００ｍｌ容量のビーカー（径１０．５ｃｍ、高さ１４．５ｃｍ）に２０℃の３°硬水８６６ｍｌを入れ、水溶性フィルムで包装した種子消毒剤１３３．３ｇ（希釈倍率７．５倍）を投入し、水和後水を加えて１０００ｍｌとし、マグネチックスターラー（撹拌子長さ６ｃｍ、回転数３００〜４００ｒ．ｐ．ｍ）で５分間撹拌して分散させたあと、撹拌を止め分散液の凝集の有無を目視により評価した。
評価基準 Ａ：凝集なし Ｂ：若干凝集あり Ｃ：凝集あり
【００３２】
試験例３（イネばか苗病防除効果試験）
試験例１で種子消毒した種籾を１５℃で６日間浸種し、さらに３０℃で１晩催芽した。この種籾１５０ｇ中の１８ｇ量を、通常の育苗箱（縦×横×高さ＝６０ｃｍ×３０ｃｍ×３ｃｍ）の１／１０の大きさの育苗箱（縦×横×高さ＝１２ｃｍ×１５ｃｍ×３ｃｍ）に播種し直ちに覆土した。覆土後は３２℃で２日間出芽処理し、出芽後２日間は温室内の寒冷紗で遮光し、その後は寒冷紗を除去し通常の栽培管理をした。
【００３３】
なお、育苗培土には市販のクミアイ粒状培土Ｄ（呉羽化学工業株式会社製）を使用した。
播種３０日後に育苗箱の全苗について徒長、枯死などのイネ馬鹿苗病状を示した発病苗数と無病徴の苗数について調査し下記式によって発病苗率（％）を求め防除価（％）を求めた。また薬害については出芽程度、生育程度などについて観察し、下記の薬害程度で示した。
発病苗率（％）＝（発病苗数）／（総調査苗数）×１００
防除価（％）＝｛１−（処理区の発病苗率）／（無処理区の発病苗率）｝ ×１００
【００３４】
薬害程度
−：無 ±：微 ＋：小 ＋＋：中 ＋＋＋：大
【００３５】
試験例１〜３の結果を表１に示す。
試験例１〜３の結果から了解されるように、本発明によれば、種籾への付着量において優れており、水中分散性が良好で、かつ優れた種子消毒活性を期待することができる。
【００３６】
【表１】
【発明の効果】
本発明の高濃度希釈用の種子消毒水和剤を用いると、次のような効果がもたらされる。
すなわち、第１に、水で３倍〜２０倍に希釈して稲の種籾に吹き付処理すると薬液の付着量が増し、種子消毒効果が卓効を示し、安定した効果を発揮するようになる。第２に、粉末状の水和剤を水溶性高分子フィルムで包装しているので、水中に投入して希釈液を調製する作業で粉立ちがなく、取り扱いやすい。その結果、人に粉末がかかるなどの悪影響もなくなる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seed disinfecting wettable powder for high-concentration dilution containing penta-4-enyl = N-furfuryl-N-imidazol-1-ylcarbonyl-DL-homoalaninate (hereinafter referred to as “pefurazoate”). Related to improved technology.
[0002]
[Prior art]
As the seed disinfectant, a powdered wettable powder composed of an agrochemical active ingredient, a surfactant and a bulking agent such as clay is widely used. In use, a method of diluting the wettable powder 20 to 200 times with water and immersing the seed meal in the diluted solution is generally performed. Recently, as a method for labor-saving disinfection of a large amount of seeds, a so-called high-concentration diluted solution obtained by diluting a wettable powder 3 to 20 times with water is used, which is equivalent to 3% of the dry seed weight. A method in which a high-concentration diluted solution is sprayed onto seeds using a seed disinfection spraying device has become widespread.
Since this high-concentration dilution spraying method requires a small amount of chemical solution for seed pods, it requires chemical adhesion sufficient to exert seed disinfection effects on seed pods.
However, conventional seed disinfectants for high-concentration dilution do not necessarily provide a sufficient amount of adhesion, and there are situations where the seed disinfection effect is not sufficient.
[0003]
In addition, the present invention is characterized in that the preparation is packaged with a water-soluble film and used, but the wettable powder is packaged with a water-soluble film and diluted 400 to 3000 times with water at the time of use, and then the plant foliage and pests are used. The method of distributing to etc. is known. In addition, for example, an agrochemical that may contain a foaming agent or a buoyancy improver in a form in which a solid agricultural chemical formulation that is easily decomposed or dissolved in water or on the surface of water is wrapped in a sheet that is broken or dissolved in water. JP-A-4-226901 discloses a composition, a pesticide composition in the form of a tablet containing a foaming agent, a pesticide composition in the form of a tablet containing a buoyancy improver, and a method for treating a pesticide by throwing the pesticide composition into a paddy field The described techniques are known.
[0004]
Moreover, the technique of Unexamined-Japanese-Patent No. 5-78207 is known regarding the method of simply processing a chemical | medical agent by throwing the water surface expansion | deployment agricultural chemical formulation packaging body packaged with the water-soluble film into water systems, such as a paddy field. Further, the wettable powder and / or granular wettable powder containing at least one pesticidal active ingredient that is a pest control active ingredient or a food growth regulating active ingredient and having an apparent density of less than 1 g / cm 3 is weighted. Japanese Patent Application Laid-Open No. Hei 5 (1990) relates to a packaged agricultural chemical formulation characterized in that the composition added is contained in a water-soluble film, and the apparent density of the composition in the water-soluble film is 1 g / cm 3 or more. A technique described in Japanese Patent No. -310502 is known. Furthermore, it is an agrochemical formulation in which an agrochemical wettable powder or granular wettable powder is packaged with a water-soluble base material, and the water-soluble base material passes through a gas, but the pesticide wettable powder, the granular wettable powder JP-A-8-245307 discloses a technique relating to a packaged agrochemical formulation that has a short water submergence time when diluted with water, and has a hole that cannot pass through.
[0005]
However, in any case, a technique for distributing and using a normal concentration of the diluted solution of a water-soluble film packaging bag 200 to 2000 times with water, or putting the packaging bag itself into the water And packaging the preparation used by diluting 3 to 20 times with water with a water-soluble film, and its applicability as a high-concentration seed disinfectant for the water-soluble film packaging bag There have not yet been any reports or researches on the adhesion of drugs to drugs, and the current state of the art is not sufficient even with conventional technical knowledge.
[0006]
[Problems to be solved by the invention]
Until now, seed disinfectants for high-concentration dilution have not been sufficient in adhesion of the drug to the seeds. Therefore, development of a seed disinfectant free from these problems is desired. In addition, since a large amount of powdered wettable powder is handled when preparing a high concentration chemical solution for seed disinfection, powdering is extremely difficult during work, workability is poor, and safety such as exposure of chemicals to workers There are also problems, and improvements are required.
Under such circumstances, the object of the present invention is good adhesion of the drug to the seed, and there is no problem of workability and safety because there is no powdering of the wettable powder when preparing a high concentration drug. It is to provide a seed disinfectant preparation for high concentration dilution.
[0007]
[Means for Solving the Problems]
The present inventors diligently studied to solve these problems. As a result, a preparation containing a seed disinfectant containing pefrazoate having the following chemical structural formula and packaged with a water-soluble film for seed disinfectant for high-concentration dilution is highly adherent to seed potatoes and used for high-concentration dilution. It was found that it is useful as a seed disinfectant.
[0008]
[Chemical 1]
The seed disinfecting wettable powder packaged with this water-soluble film may be put into water as it is, and then mixed by ordinary stirring. At this time, since the drug is packaged in a water-soluble film, there is no dusting and the workability and safety are excellent. And especially the adhesion efficiency of the chemical | medical agent to a seed pod is improved greatly, and there is no problem of a seed disinfection effect fall, and seed disinfection can be performed in comfort.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the seed disinfectant for high concentration dilution according to the present invention will be described.
First, the packaging body by the water-soluble film for packaging the seed disinfectant of the present invention will be specifically described.
[0011]
The water-soluble film used in the present invention may be any film that dissolves in water and has a certain strength as a packaging bag, and the material of the film is chemical and physical with the seed disinfectant that is the content. Select one that is suitable in terms of overall stability. As the water-soluble film, a film made of a natural water-soluble polymer, a synthetic water-soluble polymer, or a semi-synthetic water-soluble polymer is effectively used. Examples thereof include, but are not limited to, and may be used in combination of one or more of them.
(1) Examples of natural water-soluble polymers Starch, sodium alginate, xanthan gum, pullulan and the like.
(2) Examples of synthetic water-soluble polymers Polyvinyl alcohol, sodium polyacrylate, polyethylene oxide, polyvinylpyrrolidone and the like.
(3) Examples of semi-synthetic water-soluble polymers such as hydroxyethyl cellulose and carboxymethyl cellulose.
[0012]
The thickness of the water-soluble film may be selected based on the relationship between the amount of the content and the strength of the film, and a thickness of 20 μm to 60 μm is usually used.
When the water-soluble film is thin, the amount of the water-soluble film in the water dilution solution is reduced, and the amount of the drug attached to the seed is reduced. When the water-soluble film is thick, it is expected that the amount of water-soluble film in the water dilution solution will increase and a good amount of adhesion to the seed will be obtained. Aggregation occurs and spraying cannot be performed. Moreover, when the dilution rate is high, the amount of the water-soluble film is reduced in the water dilution solution, and the amount of the drug attached to the seed is reduced. When the dilution ratio is low, it is expected that the amount of water-soluble film in the water dilution solution will increase and a good amount of adhesion to the seed will be obtained. Aggregation occurs and spraying cannot be performed.
[0013]
Therefore, it is important that the water-soluble film is used in an amount corresponding to 0.006 to 0.06 parts by weight with respect to 1 part by weight of the seed disinfecting agent. Within this range, powdering of the drug is prevented and good adhesion to the seed of the drug is obtained. When the amount of the water-soluble film is less than 0.006 times by weight, the amount of the drug attached to the seed is reduced, and when it is more than 0.06 parts by weight, the agent is agglomerated in the diluted drug solution with water, and the spray treatment is become unable.
[0014]
Next, the seed disinfecting agent used in the present invention may be any seed disinfecting wettable powder normally used for disinfecting seeds using a spray device for seeds. For example, the following may be mentioned.
Disinfecting ingredients for seed disinfection Benomyl, thiabendazole, thiophanate methyl, thiuram, prochloraztrifumizole, ipconazole, basic copper chloride, cupric hydroxide and the like.
Insecticide for seed disinfection <br/> Fenitrothion etc.
The names of these agrochemical active ingredients are the compounds described in “Agricultural Chemicals Handbook” (December 15, 1998, issued by the Japan Plant Protection Association).
[0015]
Although the preparation method of the package body of the seed disinfectant for high concentration dilution packaged with the water-soluble film of the present invention is not particularly limited, it can be prepared by the following method. For example, a seed disinfecting wettable powder for high-concentration dilution, which is diluted 3 to 20 times with water and used from the agrochemical active ingredient, surfactant, extender and the like for seed disinfection as described above. If the wettable powder thus obtained is packaged with a water-soluble film equivalent to 6 g to 60 g by weight, the seed disinfectant preparation for high concentration dilution of the present invention can be obtained.
[0016]
Examples of the sea surface active agent used to prepare the wettable powder for high concentration dilution of the present invention include nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants and the like. There is.
Examples of nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, polyoxyethylene phenyl ether polymer, Examples include polyoxyethylene alkylene aryl phenyl ether, polyoxyethylene alkylene glycol, polyoxyethylene, and polyoxypropylene block polymer.
[0017]
Examples of anionic surfactants include lignin sulfonate, alkylaryl sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkylaryl ether sulfate, alkylnaphthalene sulfonate, polyoxyethylene styryl phenyl ether sulfate, lauryl sulfate A salt etc. can be mentioned.
Examples of the cationic surfactant include alkylamine salts.
Examples of amphoteric surfactants include amide betaine type and imidazaline type.
The surfactants that can be used in the present invention are not limited to those exemplified above.
[0018]
Further, a bulking agent is used for preparing the seed disinfecting preparation according to the present invention as a wettable powder. Examples thereof include clay, talc, bentonite, calcium carbonate, white carbon, sucrose, lactose, diatomaceous earth, ammonium sulfate, sodium sulfate and the like. And these can be used in mixture of 2 or more types used independently.
Further, as other adjuvants, a seed disinfecting active ingredient stabilizer with time, an antifoaming agent and the like can be added as necessary to prepare a preparation.
[0019]
【Example】
Next, the present invention will be described more specifically with reference to the following examples, but the present invention is not limited thereto. “Parts” means all parts by weight. Moreover, the part in () shows the addition ratio of the water-soluble film to 1 part of the high-concentration diluted seed disinfectant.
[0020]
Example 1
20 parts of pefazoate, 20 parts of thiuram, 10 parts of polyoxyethylene styryl phenyl ether, 5 parts of sodium salt of β-naphthalenesulfonic acid formalin condensate, 20 parts of white carbon, 15 parts of lactose and 10 parts of clay A wettable powder was prepared by pulverization and mixing. 133.3 g of this wettable powder is wrapped in an envelope with a water-soluble polyvinyl alcohol film equivalent to 1.6 g (0.012 parts) in thickness of 40 μm in weight, and seed disinfecting water for high concentration dilution according to the present invention. A balm was obtained.
[0021]
Example 2
A wettable powder was prepared by grinding 20 parts of pefazoate, 5 parts of polyoxyethylene styryl phenyl ether, 5 parts of sodium lignin sulfonate, 20 parts of white carbon, and 50 parts of sucrose with a hammer mill, and 133.3 g of this wettable powder. Was packaged in an envelope with a water-soluble polyvinyl alcohol film equivalent to 0.8 g (0.006 parts) in weight of 20 μm in thickness and the seed disinfecting wettable powder for high concentration dilution of the present invention was obtained.
[0022]
Example 3
20 parts of pefrazoate, 20 parts of thiuram, 10 parts of polyoxyethylene styryl phenyl ether, 5 parts of sodium salt of β-naphthalenesulfonic acid formalin condensate, 20 parts of white carbon, 15 parts of lactose and 10 parts of clay are mixed and pulverized with a hammer mill. A wettable powder was prepared. 133.3 g of this wettable powder is wrapped in an envelope with a water-soluble polyvinyl alcohol film equivalent to 2.6 g (0.0195 parts) in thickness of 20 μm and weighed in the seed disinfecting hydrate for high concentration dilution according to the present invention. An agent was obtained.
[0023]
Example 4
The thickness of the water-soluble polyvinyl alcohol film of Example 3 was changed from 2.6 g (0.0195 parts) to 7.8 g (0.0585 parts)) by replacing the thickness of 20 μm with 40 μm and changing the film weight per 133.3 g of the preparation. A seed disinfecting wettable powder for high-concentration dilution was obtained in the same manner as in Example 3 except that it was replaced.
[0024]
Example 5
A water-soluble polyvinyl alcohol film of Example 1 (thickness 40 μm, film weight 1.6 g (0.012 parts) per 133.3 g of the preparation was pulled with pullulan (thickness 20 μm, film weight 0.8 g per 133.3 g of the preparation). A high-concentration dilution seed disinfectant preparation was obtained in the same manner as in Example 1 except that (0.006 part) was used.
[0025]
Example 6
A water-soluble polyvinyl alcohol film of Example 2 (thickness 20 μm, film weight 0.8 g (0.0060 parts) per 133.3 g of formulation) was pulled with pullulan (thickness 30 μm, film weight per 133.3 g of formulation 1. A high-concentration diluted seed disinfectant preparation was obtained in the same manner as in Example 2 except that the amount was changed to 0 g (0.0075 parts).
[0026]
Comparative Example 1
A wettable powder was obtained as in Example 1, but not packaged with a water-soluble film.
Comparative Example 2
A wettable powder similar to Example 2 but not packaged with a water-soluble film was obtained.
Comparative Example 3
A wettable powder was obtained as in Example 3, but not packaged with a water-soluble film.
[0027]
Comparative Example 4
Water-soluble polyvinyl alcohol film of Example 1 (thickness 40 μm, film weight 1.6 g (0.012 parts) per 133.3 g of formulation) 20 μm in thickness, and film weight per 133.3 g of formulation 0.6 g A seed disinfectant for high concentration dilution similar to Example 1 was obtained except that (0.0045 parts) was used.
[0028]
Comparative Example 5
A water-soluble polyvinyl alcohol film of Example 3 (thickness 20 μm, film weight 2.6 g (0.0195 parts) per 133.3 g formulation) was 60 μm thick, and film weight per formulation 133.3 g was 8.5 g. A seed disinfectant for high concentration dilution was obtained in the same manner as in Example 3 except that (0.0638 parts) was used.
[0029]
Here, the adhesiveness, dispersibility, and control effect of the seed disinfectant for high concentration dilution according to the present invention will be shown by the following Test Examples 1 to 3, to further clarify the usefulness of the present invention.
[0030]
Test example 1 (Amount of adhesion to seed potatoes)
For dry seed pods (various varieties: “Nipponbare”) of rice bonito seedlings with natural infections, a high concentration dilution seed disinfecting wettable powder prepared according to Example 1 is adjusted to a predetermined concentration with water. Diluted chemical solution or seed disinfectant not packed in water-soluble film was diluted with water. 4.5 ml of chemical solution (equivalent to 3% of the dry seed meal weight) was sprayed using an air spray gun (F88 type, manufactured by Meiji Machinery Co., Ltd.) so as to uniformly adhere to the seed meal. The agrochemical active ingredient was extracted from a part (10 g) of the seed meal after this chemical solution treatment and analyzed by HPLC (high performance liquid chromatograph) to calculate the amount of the drug attached to the seed meal.
[0031]
Test Example 2 (Dispersibility test in water)
Place 866 ml of 3 ° hard water at 20 ° C into a beaker with a capacity of 1000 ml (diameter 10.5 cm, height 14.5 cm), and feed 133.3 g of seed disinfectant packaged with a water-soluble film (dilution factor 7.5 times). After hydration, water was added to 1000 ml, and the mixture was stirred for 5 minutes with a magnetic stirrer (stirring length 6 cm, rotation speed 300 to 400 rpm) to disperse. The presence or absence was visually evaluated.
Evaluation criteria A: No aggregation B: Some aggregation C: There is aggregation [0032]
Test Example 3 (Bone Seedling Control Effect Test)
The seed pods sterilized in Test Example 1 were soaked at 15 ° C. for 6 days and further germinated at 30 ° C. overnight. A seedling box (vertical x horizontal x height = 12 cm x 15 cm x 3 cm) that is 1/10 the size of a normal nursery box (vertical x horizontal x height = 60 cm x 30 cm x 3 cm). ) And immediately covered with soil. After covering the soil, budding treatment was carried out at 32 ° C. for 2 days. After budding, the plant was shielded from light with cold chillers in the greenhouse, after which the chilled potatoes were removed and normal cultivation management was carried out.
[0033]
In addition, the commercially available Kumiai granular culture soil D (made by Kureha Chemical Industry Co., Ltd.) was used for the seedling culture soil.
After 30 days of sowing, all seedlings in the nursery box were investigated for the number of diseased seedlings and disease-free seedlings that showed rice ridiculous disease conditions such as chief, dead, etc., and the diseased seedling rate (%) was calculated by the following formula and the control value (%) Asked. Regarding phytotoxicity, the degree of emergence and growth were observed, and the following phytotoxicity was shown.
Disease seedling rate (%) = (number of diseased seedlings) / (total number of seedlings) × 100
Control value (%) = {1- (Disease seedling rate in treated area) / (Disease rate in untreated area)} × 100
[0034]
Degree of chemical damage-: None ±: Slight +: Small ++: Medium +++: Large
The results of Test Examples 1 to 3 are shown in Table 1.
As understood from the results of Test Examples 1 to 3, according to the present invention, the amount of adhesion to seed pods is excellent, the dispersibility in water is excellent, and excellent seed disinfection activity can be expected.
[0036]
[Table 1]
【The invention's effect】
When the seed disinfecting wettable powder for high concentration dilution of the present invention is used, the following effects are brought about.
That is, first, when the water is diluted 3 to 20 times with water and sprayed onto the rice seed pods, the amount of the chemical solution increases, the seed disinfection effect is excellent, and a stable effect is exhibited. . Secondly, since the powdered wettable powder is packaged with a water-soluble polymer film, it is easy to handle because there is no dusting in the operation of putting it in water and preparing a diluted solution. As a result, there are no adverse effects such as powder on humans.
Claims (2)
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| JP2000269534A JP4603663B2 (en) | 2000-09-06 | 2000-09-06 | Seed disinfectant for high concentration dilution |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233015A (en) * | 1994-02-21 | 1995-09-05 | Hokko Chem Ind Co Ltd | Water-dispersible agent for spraying for control of seed disease injury |
| JPH11152201A (en) * | 1997-06-05 | 1999-06-08 | Hokko Chem Ind Co Ltd | Preparation of spray agent for flooded paddy field and method for spraying |
| JP2002060306A (en) * | 2000-08-18 | 2002-02-26 | Hokko Chem Ind Co Ltd | Water-dispersible powder for disinfecting seed, usable by high density dilution |
-
2000
- 2000-09-06 JP JP2000269534A patent/JP4603663B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233015A (en) * | 1994-02-21 | 1995-09-05 | Hokko Chem Ind Co Ltd | Water-dispersible agent for spraying for control of seed disease injury |
| JPH11152201A (en) * | 1997-06-05 | 1999-06-08 | Hokko Chem Ind Co Ltd | Preparation of spray agent for flooded paddy field and method for spraying |
| JP2002060306A (en) * | 2000-08-18 | 2002-02-26 | Hokko Chem Ind Co Ltd | Water-dispersible powder for disinfecting seed, usable by high density dilution |
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