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Absence of ovicidal effects of fenoxycarb in the tick Ixodes dammini as observed by light, scanning, and transmission electron microscopy.

Freshly oviposited eggs from fed females of the northern deer tick Ixodes dammini were divided into two groups--untreated controls and fenoxycarb-exposed ova. The level of fenoxycarb exposure in the experimental group was equal to a concentration that proved 100% lethal in the cat flea, Ctenocephalides felis (Marchiondo et al. 1990). Both groups were allowed to develop with samples taken at 48 and 144 h for examination by light microscopy, scanning electron microscopy, and transmission electron microscopy. No disruption of the stages of tick embryological development was observed when specimens were examined by these methods. Eggs not sampled for light microscopy or scanning or transmission electron microscopy during development were allowed to hatch. The resulting larvae were fully developed and motile in both the control and experimental conditions, further supporting the conclusion that embryological development of I. dammini is not disrupted by concentrations of fenoxycarb which would be practical in the field.