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HOME > 農業技術  > 防除LABO  >第16回 ナス編&nb...

農業技術 | 防除LABO

第16回 ナス編 諸刃の剣!? 害虫を一掃するサウナ処理!の巻 | 農業経営者 11月号 | (2006/11/01)

重曹が効果を発揮する条件と残効性



専門家  防除暦を拝見しました。たしかに農薬使用回数が少ないですが、もう少しほかの種類の農薬を取り入れてもいいように思いました。農薬はどのように選んでいるのでしょうか?

田村  ミツバチとマルハナバチを使っているので、3日以上ハチを外に出さないといけない薬剤は使わないようにしています。それに、病害虫が発生する時期のパターンもわかっているので、防除スケジュールは決まってきます。

専門家  うどんこ病には重曹を主に使っていますね。混用でも効果はありますか?

田村  予防的に使っているのですが、よく効いていますね。投入する間隔が空いていたことを考えると15日くらいは残効性があるのではないでしょうか? 灰色カビへの効果も感じます。

専門家  重曹は液に接触した菌に効くので、残効性はないと言われています。ただ、うまく菌の密度を下げることができれば、再び菌の密度が上がるまでの時間が稼げます。田村さんの場合はほかの農薬と混用したので、散布液が均一に付着したことも影響したのかもしれません。 (以下つづく)
Posted by 編集部 10:26

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