Wax Moth Treatment
  David A. Cushman logo  

PDB Crystals
Para Dichloro Benzene used in Wax Moth Control


It is no longer acceptable to use PDB to protect combs against wax moth. Current scientific opinion is that its use is injurious to health. PDB is both wax and water soluble then released into honey when stored in combs. In the U.K. no trace of PDB is permitted in honey.
There will be many books, leaflets, articles, etc in circulation for some years to come. Beekeepers are strongly advised to avoid the use of PDB.

This page is retained for historical purposes only. Roger Patterson.

Chemical Name... Paradichlorobenzene
Molecular Formula... C6 H4 Cl2
Molecular Weight... 147.00
Other Names... PDCB, P - Dichlorobenzene
Paradichlorobenzene Molecule

If supers must be stored in a warm room or cellar or stored during the Summer and Autumn months, they can be protected by using Paradichlorobenzene (PDB) crystals. These crystals are placed on a small piece of paper between every fourth or fifth super in a stack, which should then be sealed using parcel tape.

The treatment must be repeated by replenishing the crystals at regular intervals as PDB kills adults and immature wax moths, but not eggs.

The presence of crystals within the stack repels any visiting moths and inhibits egg laying, and also kills young larvae that may hatch after the combs are placed in storage.

Supers should be aired before using them on colonies. See label or package for details on using PDB.

There is a variation of this treatment whereby newspaper is spread over every super and a few crystals of PDB sprinkled on each layer. A further variation is to place the crystals in a stationary envelope and pin the open envelope inside a super using a drawing pin (thumb tack) through the flap.

Moth balls and some crystals are made from naphthalene, which is not the same as Paradichlorobenzene (PDB) crystals and is not recommended for wax moth control.