Technical Abstract: A radio frequency treatment, with a pulse mode to increase heating uniformity, was examined as a potential quarantine treatment against fifth instars of the codling moth, Cydia pomonella L. (Lepidoptera: Tortricidae), in apples, Malus sylvestris (L.) var. domestica (Borkh.) Mansf., intended for export to Japan. Apples were exposed to 27.12 MHz radio frequency energy at 12 kW with a pulse mode of 30 sec-on/30 sec-off for different durations. Temperature uniformity was determined by measurements at 12 sites evenly spaced at two depths in the fruit. The most promising exposure was 29 min. Efficacy of the treatment with the pulse mode was conducted against the codling moth larvae by using exposures between 27 and 30 min and up to 30 min holding time. The least severe treatment that killed all larvae was the 29 min exposure with 5 min holding. This treatment was appraised for fruit quality in ‘Delicious’ apples. Some injury was observed when treated fruits were removed from 1°C storage after 30 days. When these fruits were held at 25 °C for one week, all were too damaged to evaluate. Although pulse mode increased heating uniformity in the fruit, the thermal requirements to control codling moth larvae may exceed the injury threshold of the fruits.