To provide a method for controlling curculionid, replacing methyl bromide fumigation of chestnut fruits.

The method for insecticiding and preserving chestnuts includes installing an electroconductive electrode in an insulated atmosphere, generating an electrostatic field in the surrounding of the electroconductive electrode by applying a voltage of 100-30,000 V to the electroconductive electrode, placing harvested chestnuts in the electrostatic field in an insulated state, and setting the temperature in the chamber at 0C to -6C.