Editing Diapause (section)

===Induction===
The induction phase occurs at a genetically predetermined stage of life, and occurs well in advance of the environmental stress.<ref name="Kostal" /> This sensitive stage may occur within the lifetime of the diapausing individual, or in preceding generations, particularly in egg diapause.<ref name="Huffaker">Huffaker, C.B. and Gutierrez, A.P., Eds. 1999. Ecological Entomology. John Wiley & Sons, Inc.</ref> During this phase, insects are responsive to external cues called token stimuli, which trigger the switch from direct development pathways to diapause pathways. Token stimuli can consist of changes in [[photoperiod]], [[thermoperiod]], or [[allelochemicals]] from food plants. These stimuli are not in themselves favourable or unfavourable to development, but they herald an impending change in environmental conditions.<ref name="Tauber" />