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In page Peppermint:

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Peppermint oil has a high concentration of natural pesticides, mainly pulegone (found mainly in M. arvensis var. piperascens (cornmint, field mint, or Japanese mint),[1] and to a lesser extent (6,530 ppm) in Mentha × piperita subsp. notho[2]) and menthone.[3] It is known to repel some pest insects, including mosquitos,[4][5][6] and has uses in organic gardening[citation needed]. It is also widely used to repel rodents.[7]