Thymol is a natural phenol derivate found in oil of thyme ( a member of the mint family ) or  various other kinds of plants.  It is extracted as a crystaline substance of a pleasant aromatic odor and strong antiseptic properties. It is  an effective fungicide. It is  extremelly soluble in alcohols.  Its solution  is  25x stronger  than phenol.  Strong effects already at a dilution of 1:3000.

Its use  can be twofold :

• In crystaline form – whole or crushed in smaller pieces – can be put in container ( glass holder ) in a storage box where it is sublimating and its vapors are destroying pests, funges.
• In liquid form can also be poured into a glass holder or its mixture can be applied on celulose paper which separates individual insects apart.