Some effects of photoperiod on the development of Neodiprion swainei Midd.

Abstract

Uninterrupted development of Neodiprion swainei Midd. occurs if feeding larvae are reared under 16.5- to 19-h photophases. Experimental evidence indicates that the limitations placed on N. swainei by its host specificity, diapause requirements, and developmental rates effectively rule out more than one generation per year. Because of the photoperiodic control of diapause, it is unlikely that the insect can develop under natural conditions without a prepupal diapause.