Development Periods of Rhipicephalus Appendiculatus Neumann (Acarina: Ixodidae) under Field Conditions
Batches of engorged Rhipicephalus appendiculatus ticks (females, nymphs and larvae) were placed in gauze-covered vials in the field at monthly intervals and left to complete development. The ticks were placed in open areas and tree shaded areas; the latter being consistently cooler.
The duration of development varied seasonally and was inversely related to environmental temperature. The mean time to oviposition ranged from 5 days during the hot dry season to 25 days during the cool dry season. There was a high larval mortality during the larval to nymphal moult. However, the available data shows that the mean time to larval-nymphal moult ranged from less than 2 weeks during the hot dry season to 7 weeks in the cool season. The mean time to nymphal-adult moult ranged from less than 3 weeks in the hot season to over 13 weeks in the cool dry season. Egg hatching ranged between 3 weeks in the hot dry season and 15 weeks in the cool dry season.
Key WordsRhipicephalus appendiculatus adult nymphs larvae eggs developmental periods field conditions moulting hatching oviposition open site seasonal temperature
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