Herbs as natural pesticides?

(BBC): Common herbs and spices show promise as an environmentally-friendly alternative to conventional pesticides, scientists have told a major US conference. They have spent a decade researching the insecticidal properties of rosemary, thyme, clove and mint. They could become a key weapon against insect pests in organic agriculture, the researchers say, as the industry attempts to satisfy demand. The "plant essential oils" have a broad range of action against bugs. Some kill them outright while others repel them. These new pesticides are generally a mixture of tiny amounts of two to four different herbs diluted in water.

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