The laboratory trials rank the virulence of entomopathogenic nematode strains (3 heterorhabditids and 6 steinernematids) to engorged female Boophilus annulatus ticks according to 3 parameters of the infection process: the effect of exposure time on tick mortality, the quantity of nematodes that penetrate ticks, and the rate of tick mortality after the injection of 1, 2, or 3 nematodes. Exposure of the ticks to heterorhabditid strains for 6 hr resulted in >80% mortality, but only 20 or 65% mortality after exposure to most steinernematids. The quantity of nematodes recovered per tick exposed to nematodes for 6 days averaged from 16 to 141. For steinernematids, a negative correlation was obtained between tick mortality and the average quantity of nematodes recovered. Injecting 1 infective juvenile from 1 of 2 heterorhabditid strains into each tick resulted in close to 100% mortality. Increasing the quantity of nematodes injected into each tick had little or no additive effect on tick mortality.
Factors Affecting the Virulence of Entomopathogenic Nematodes to Engorged Female Boophilus Annulatus TICKS
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I. Glazer, E. Alekseev, M. Samish; Factors Affecting the Virulence of Entomopathogenic Nematodes to Engorged Female Boophilus Annulatus TICKS. J Parasitol 1 August 2001; 87 (4): 808–812. doi: https://doi.org/10.1645/0022-3395(2001)087[0808:FATVOE]2.0.CO;2
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