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The following is a herbal formula that has circulated among fly fishing enthusiasts to protect their tying materials from insect damage...

Mothballs have been used by fly tiers for years. However, recent studies have indicated that both Para Dichlorobenzene and Naphthalene used in mothballs may be linked to illnesses, including cancer.
Have you been infested by bugs in your fly tying supplies? Here is a mixture to keep them away and keep you from gagging on moth ball fumes! There is a similar Herbal Moth Repellent sold at Wal-Mart, naturally called Moth-Away which contains some of the same ingredients, but is not effective against all of the critters that a fly tier can encounter:

1 Part Tansy or Yarrow leaves – dried
4 Parts Mint – dried
2 Parts Wormwood - dried
1 Part Rosemary - dried
½ Part Cloves (ground)
½ Part Oris Root for moisture
1 Part Bay Leaves Dried and Crumbled

All ingredients should be “Coarsely Ground” not powder like. Combine the above ingredients and mix (tumble) them together in a large air-tight container. Fill small cloth bags (sometimes called potpourri or tea bags) with the bug dope and place one in each SEALED container of natural fly tying materials. You can also hang them around the house near such areas as cellar windows to eliminate house flies, spiders, moths, earwigs, etc. The Dope is good for a minimum of 3 years; however, it is suggested to squeeze the bag to reactivate the dope at least every 3 to 6 months.

Materials can be found at most natural / health food stores.