Response of Codling Moth and Oriental Fruit Moth (Lepidoptera: Tortricidae) Immatures to Low-Temperature Storage of Stone Fruits

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Low-temperature storage at O°C for 7, 14, and 21 d was studied as a potential quarantine treatment to disinfest stone fruits of immature codling moth, Cydia pomonella (L.), and oriental fruit moth, Grapholita molesta (Busck). Larvae were treated in diet cups, and 1-d-old eggs were treated on either waxed paper in diet cups or on glass slides. Codling moth eggs exposed to low-temperature storage for 14 d did not develop to the adult stage. Complete mortality of codling moth eggs exposed to low-temperature storage for 21 d occurred in the embryonic stage. First, second, and third instars of oriental fruit moth did not survive to the adult stage after low-temperature storage for 21 d. Survival of immatures of both species to the adult stage was directly related to age and inversely related to exposure period. Codling moth females that survived a 7-d low-temperature storage in the egg stage laid fewer eggs and fewer viable eggs than control females. Oriental fruit moth immatures were more susceptible to low temperatures than codling moth immatures. Low-temperature storage may be used as a quarantine treatment for both pests if combined with other treatments.

Document Type: Research Article

Publication date: August 1, 1989

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