COMBINED HEAT-TREATMENTS AND COLD-STORAGE EFFECTS ON MORTALITY OF 5TH-INSTAR CODLING MOTH (LEPIDOPTERA, TORTRICIDAE)

Combined heat treatments and cold storage have potential as a quaranti ne treatment for fifth instar of codling moth, Cydia pomonella (L.). L arvae were subjected to heat treatments of 43, 44, or 45 degrees C for 30 min, followed by cold storage at 5 or 0 degrees C for up to 28 d. Combinations of these treatments increased larval mortality compared w ith either treatment alone. Mortality increased with increasing intens ity of heat treatment and duration of cold storage. Combination treatm ents could be effective in commodities, such as apples and pears, whic h can endure short periods of heat stress and prolonged cold storage.