Naphthalene flakes (“moth flakes”) may repel chipmunks from attics, summer cabins, and storage areas when applied liberally (4 to 5 pounds of naphthalene flakes per 2,000 square feet [1.0 to 1.2 kg/100 m2]). Use caution, however, in occupied buildings, as the odor may also be objectionable or irritating to people or pets. Despite the fact that naphthalene flakes may sometimes work as a chipmunk repellent, be aware that such a use is not supported by the label and is technically illegal.
There are currently no federally registered repellents for controlling rodent damage to seeds, although some states have Special Local Needs 24(c) registrations for this purpose.
Taste repellents containing bitrex, thiram, or ammonium soaps of higher fatty acids can be used to protect flower bulbs, seeds, and foliage not intended for human consumption. Multiple applications of repellents will be required. Repellents can be expensive and usually do not provide 100% reduction in damage to horticultural plantings.
Resources: (online)
Chipmunks
