Abstract
The development cycle of Dermacentor variabilis (Say) in Nova Scotia allows the full production of diapause larvae from the spring adult breeding period. The overwinter stages, larvae and adults, cope with the harsh winter environment. The shift from the two cohort life cycle of D. variabilis in New England to the one cohort cycle in Nova Scotia removes the regulation involved in the passage from the spring adult cohort to the summer adult cohort.
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