As an insecticide for control of fruit borers and ants.

May be applied to tobacco seed beds for blue mold control.
For the control of peach tree borer;
Mildew and mold on leather and fabrics.

Gallery injections with 6 insecticides and 3 fumigants were tested for comparative effectiveness in controlling Prionoxystus robiniae (Peck), and Paranthrene simulans (Grote). The three fumigants (carbon disulfide, Serafume, and Para dichlorobenzene) provided complete control.

The gallery injection technique was deemed feasible for use against borers in high-value trees. Gallery injection has advantages over bark sprays because it can give satisfactory control of borers already established in galleries and limits chemical application to a few galleries instead of entire trees or stands of trees.

It is used as an additive in resin-bonded abrasive wheels to provide a more open structure, and vaporizes during the curing operation leaving pores and wider grain spacing.

Hydrolysis of 1,4-dichlorobenzene with cupric salts and hydroxylamine gives the para-chlorophenols.

Nitration of p-dichlorobenzene to yield 1,4-dichloro-2-nitrobenzene intermediate for dyestuff.

The reaction of p-dichlorobenzene with sodium sulfide in a polar organic solvent to produce PPS - poly(phenylene sulfide) An engineering plastic used for surface coatings and model resins.

Para-dichlorobenzene may have had minor use as an extreme-pressure lubricant.

Applications include use as an intermediate in organic synthesis and as on animal repellant.