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DIAPAUSE TERMINATION IN OVERWINTERING PUPAE OF RHEUMAPTERA HASTATA (LEPIDOPTERA: GEOMETRIDAE) IN INTERIOR ALASKA

Richard A. Werner

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Abstract

Abstract A method was developed to terminate pupal diapause in Rheumaptera hastata through experimentation using controlled abiotic factors. Male and female pupae exposed to 0 °C at 75–100% moisture content for 90–120 days terminated diapause within 8–19 days following treatment. This method reduces diapause by 4 months compared with natural conditions. Light had a minimum effect on diapause termination; therefore, pupae should be exposed to constant darkness during the treatment period, followed by exposure to a 20L:4D photoperiod to obtain a high percentage of adult emergence.

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What this paper is about

Abstract A method was developed to terminate pupal diapause in Rheumaptera hastata through experimentation using controlled abiotic factors. Male and female pupae exposed to 0 °C at 75–100% moisture content for 90–120 days terminated diapause within 8–19 days following treatment. This method reduces diapause by 4 months compared with natural conditions. Light had a minimum effect on diapause termination; therefore, pupae should be exposed to constant darkness during the treatment period, followed by exposure to a 20L:4D photoperiod to obtain a high percentage of adult emergence.

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Available abstract

Abstract A method was developed to terminate pupal diapause in Rheumaptera hastata through experimentation using controlled abiotic factors. Male and female pupae exposed to 0 °C at 75–100% moisture content for 90–120 days terminated diapause within 8–19 days following treatment. This method reduces diapause by 4 months compared with natural conditions. Light had a minimum effect on diapause termination; therefore, pupae should be exposed to constant darkness during the treatment period, followed by exposure to a 20L:4D photoperiod to obtain a high percentage of adult emergence.

Key concepts: Diapause, Pupa, Overwintering, Lepidoptera genitalia, photoperiodism, Biology, Darkness, Abiotic component

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