Biology of Ixodes cookei Packard (Ixodidae) of groundhogs (Marmota monax Erxleben)

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Abstract
Observations were made on the biology of the tick under natural conditions in southern Ontario and in the laboratory at 30C and 90–95% relative humidity. Twenty-nine percent of 569 groundhogs examined from March to September during 1969 and 1970 were infested with I. cookei. Four hundred and forty-four I. cookei were collected; most females were recovered in May and larvae in August. In the laboratory the life cycle of the tick was completed in about 3 months. Most females began to lay eggs 4 days after feeding. Eggs hatched in about 3 weeks. Larvae molted about 3 weeks after feeding and nymphs in about 4 weeks.

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