Abstract
Diapause in mature larvae of the European corn borer was found to be associated with three readily discernible characteristics: (1) arrested gonadal development; (2) failure to pupate shortly after cessation of larval feeding; (3) reduction of oxygen consumption to about 25 per cent that of non-diapause mature borer larvae. Diapause was found to be induced by photoperiods of from 9 to 15·5 hr of light per 24-hr period. Within this range of photoperiods, incidence of diapause was inversely proportional to the rearing temperature employed, except that with 10·5–13·5 hr photoperiods all larvae entered diapause without regard to the ambient temperature. At moderate rearing temperature (23–25°C), the mean threshold photoperiod was 15·4 hr of light per 24 hr. The diapause threshold for photoperiods under 13 hr was not determined. The physiological changes associated with diapause were found to be largely reversible up to at least the early part of the fifth larval instar. No critical growth stage for diapause determination was detected.
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