Abstract
Unfed adults of the African ticks,Amblyomma hebraeum Koch andA. variegatum (Fabricius), important vectors of human and animal diseases, were exposed to volatile compounds in an olfactometer in efforts to identify both tick-produced or synthetic chemicals capable of eliciting an attraction response. A formula, relative efficacy of attraction, was devised for comparison of responses between species and sexes to a particular test stimulus, or within a homogeneous population to different stimuli. Adults of both species responded strongly to known tick-pheromone constituents, nonanoic acid, methyl salicylate, 2.6-dichlorophenol and benzyl alcohol, as well as to a commercially produced antiseptic, TCP (Pfizer), and its major components, chlorinated and iodinated phenols. Benzaldehyde, a proposed tick-pheromone component, and heptadecane, not known from ticks, were markedly attractive to adults ofA. hebraeum but not to those ofA. variegatum. Males of the former species, but neither conspecific females not either sex of the latter species, responded significantly to salicylaldehyde (known from males of four species of ticks, includingA. variegatum).o-nitrophenol, a major component of the aggregation-attachment pheromone of males of bothA. variegatum andA hebraeum and a proven long-range attractant for them in the field, was only partially attractive to either species in the olfactometer. Neither species was attracted to 2-methylpropanoic acid, previously identified in volatile effluents form feeding maleA. hebraeum. It is concluded that these important disease vectors respond positively to a variety of volatile chemicals, which may conceivably be used to attract them to traps, animals or acaricides in efforts to control ticks or the diseases they transmit.
References
Apps, P.J., Viljoen, H.W. and Pretorius, V., 1988. Aggregation pheromones of the bont tickAmblyomma hebraeum: Identification of candidates for bioassay. Onderstepoort J. Vet. Res., 55: 135–137.
Butler, J.F. and Katz, I., 1988a. Apparatus for determination of insect repellency and attraction. U.S. Patent No. 4 748 860. Date of patent: 7 June 1988. Inventors: Jerry F. Butler, Gainesville, FL, and Ira Katz, West Long Branch, NJ. Assignees: International Flavors and Fragrances Inc., New York, NY: The University of Florida, Gainesville, FL.
Butler, J.F. and Katz, I., 1988b. Process for determination of repellency and attractancy. U.S. Patent No. 4 759 228. Date of patent: 26 July 1988. Inventors: Jerry F. Butler, Gainesville, FL, and Ira Katz, West Long Branch, NJ. Assignees: International Flavors and Fragrances Inc., New York, NY; The University of Florida, Gainesville, FL.
Gladney, W.J., Ernst, S.E. and Oehler, D.D., 1974. The Gulf Coast tick; evidence of a pheromone produced by males. J. Med. Entomol., 11: 303–306.
Hess, E, and de Castro, J.J., 1986. Field tests of the response ofAmblyomma variegatum (Acari: Ixodidae) to the synthetic aggregation-attachment pheromone and its components. Exp. Appl. Acarol., 2: 249–255.
Lusby, W.R., Sonenshine, D.E., Yunker, C.E., Norval, R.A.I. and Burridge, M.J., 1991. Comparison of known and suspected pheromonal constituents in males of the African ticks,Amblyomma hebraeum Koch andAmblyomma variegatum (Fabricius). Exp. Appl. Acarol., 13: 143–152.
Norval, R.A.I., Butler, J.F. and Yunker, C.E., 1989a. Use of carbon dioxide and natural or synthetic aggregation-attachment pheromone of the bont tick,Amblyomma hebraeum, to attract and trap unfed adults in the field. Exp. Appl. Entomol., 7: 171–180.
Norval, R.A.I., Andrew, H.R. and Yunker, C.E., 1989b. Pheromone-mediation of host selection in bont ticks (A. hebraeum) Koch. Science, 243: 364–365.
Norval, R.A.I., Peter, T.F., Yunker, C.E., Sonenshine, D.E. and Burridge, M.J., 1991. Response of the ticksAmblyomma hebraeum andA. variegatum to known or potential components of the aggregation-attachment pheromone. I. Long-range attraction. Exp. Appl. Acarol., 13: 11–18.
Rechav, Y. and Whitehead, G.B., 1978. Field trials with pheromone-acaricide mixtures for control ofAmblyomma hebraeum J. Econ. Entomol., 71: 149–151.
Schöni, R., Hess, E., Blum, W. and Ramstein, K., 1984. The aggregation-attachment pheromone of the tropical bont tickAmblyomma variegatum Fabricius (Acari, Ixodidae): Isolation, identification and action of its components. J. Insect. Physiol., 30: 613–618.
Wood, W.F., Leahy, Sister M.G., Galun, R., Prestwich, G.D., Meinwald, J., Purnell, R.E. and Payne, R.C., 1975. Phenols as pheromones of ixodid ticks: A general phenomenon? J. Chem. Ecol., 1: 501–509.
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Yunker, C.E., Peter, T., Norval, R.A.I. et al. Olfactory responses of adultAmblyomma hebraeum andA. variegatum (Acari: Ixodiae) to attractant chemicals in laboratory tests. Exp Appl Acarol 13, 295–301 (1992). https://doi.org/10.1007/BF01195086
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DOI: https://doi.org/10.1007/BF01195086