Abstract
The early balsam strain of the Neodiprion abietis complex does not have a photoperiodically controlled, prepupal diapause occurring during the summer in its normal, univoltine life cycle. This is the first instance we have found in laboratory tests of 15 species and subspecies of diprionid sawflies in which photophase does not regulate the course of prepupal development in a normal life cycle. Daylength, however, does influence the induction of an intense, or prolonged, prepupal diapause that in nature would result in at least a 2-year life cycle for individuals with the intense diapause.The duration and variability of larval development are both affected by daylength.
Published Version
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