Abstract
Photoperiodic determination of larval diapause in Ostrinia nubilalis is shown to be strongly influenced by superimposed thermoperiods, here termed “thermophotoperiods.” Thermoperiodic cryophase temperatures (0–25°C) exert effects that are markedly different from responses evoked by thermophotoperiodic cryoscotophases of the same temperatures. The differences are attributed to the presence or absence of light (thermophotophase or thermophase). Perturbations of 12 h dark: 12 h light and 10 h dark: 14 h light photoperiods by low-temperature pulses of 4 h duration demonstrated that the biological clock reactions associated with both the scotophase and photophase are sensitive to temperature. Statistically significant thermoperiod-photoperiod interactions have been demonstrated.
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