Effect of low temperatures on three embryonic stages of the codling moth (Lepidoptera: Tortricidae)
1989
Moffitt, H.R. | Burditt, A.K. Jr
Based on mortality, the order of tolerance of three embryonic stages of codling moth, Cydia pomonella (L.), eggs for temperatures near 0 degrees C was red ring white blackhead. Red ring stage eggs were 1.5 times more tolerant of low temperature than were white stage eggs egg 2.5 times more tolerant than blackhead stage eggs. Thirty-six, to 42 d exposure was required for complete mortality on mature R̀ed Delicious' or G̀olden Delicious' apples. Tolerance of low temperature was not affected by the apple variety used as the substrate for oviposition. Eggs deposited on a substrate other than apples, such an plastic film, were significantly more susceptible to the effects of low temperature. Exposure to low temperatures such as those commonly used for short- or long-term fruit storage shows promise as an alternative to fumigation as a treatment for codling moth eggs on apples and pears after harvest.
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