The Asian longhorned tick, Haemaphysalis longicornis, gets its name from anatomic spurs associated with the mouthparts (Figure 1a & 1b). It is an invasive tick spreading throughout the eastern US and is native to the Far East. Originally from China, Japan, and Korea, it was introduced to New Zealand, Australia, and several Pacific islands. This species was first introduced to the US mainland in 2010, and has been reported from 12 states, including North Carolina, where (as of August 2019) it was found in five counties: Alexander, Davidson, Polk, Rutherford, and Surry.
Females of this tick can reproduce either sexually by mating with a male, or by producing offspring without mating (parthenogenetically). Only the asexual (parthenogenic) form has been identified in the US. Regardless of the sexual form, adult female ticks may produce from about 900 to 3,300 eggs in a one-time event. Developmental time from egg to adult averages 57 days (Hoogstral et al. 1968). As a result of these biological adaptations, the parthenogenic form of this tick has the potential to reach exceptionally high densities in a few months with all offspring being female.
This three-host tick has a wide host range, capable of feeding on different animals for each of the three life stages (larva, nymph and adult; Figure 2). Full engorgement may take from 3 to 6 days for each life stage depending on the host. Typically, the larva acquires a host (usually a small mammal), feeds fully and drops off the host to molt to the next life stage. This is also true for the nymph. Adults acquire a new host and, after feeding fully, it drops off the host to lay its eggs. Female ticks die after laying their eggs. If no other hosts are available, each life stage may feed on the same host (Rainey et al. 2018). All three life stages may be found on host animals or in the environment (Figure 2).
This tick is an important pest of livestock in Australia, East Asia, and the Western Pacific region. Heavy infestations can cause severe blood loss, poor growth and development, and transmit disease to animals. Known hosts for this tick include domestic cats, dogs, cattle, goats, horses, and sheep. Wild hosts include white-tailed deer, coyotes, foxes, groundhogs, Virginia opossums and raccoons. This tick has been occasionally found attached to humans and birds.
The Asian longhorned tick is a vector of several pathogenic agents in its native range including Anaplasma, Babesia, Borrelia, Ehrlichia, Theileria and Rickettsia that cause disease of humans and animals (Beard et al. 2018). Infestations in New Zealand and Australia reduced dairy production up to 25% (Hoogstraal et al. 1968, Heath 2016). Although the disease transmission potential is significant with this tick, no diseases have been found in the US ticks. Severe infestations in cattle can cause anemia, weakness, blood loss and death (Hoogstraal et al. 1968).
Personal protection should include wearing insect repellent and treating clothing with approved permethrin repellent. Protecting pets with an approved acaracide and reapplying according to label directions is recommended. Contact your veterinarian for a list of approved pet products for tick control. Treating livestock with pyrethroid sprays or pour-on insecticide will provide protection for those animals. Botanical acaracides are showing promise for tick control but have not been evaluated for this species (Singh et al. 2018). Environmental treatments in conjunction with on animal treatments may be considered (Park et al. 2019). Read the label fully before applying any pesticide. Investigations into entomopathogenic fungi for environmental treatments are progressing (Lee et al. 2019).
Beard, C.B., Occi, J., Bonilla, D.L., Egizi, A.M., Fonseca, D.M., Mertins, J.W., Backenson, B.P., Bajwa, W.I., Barbarin, A.M., Bertone, M.A. and Brown, J., 2018. Multistate infestation with the exotic disease–vector tick Haemaphysalis Longicornis—United States, August 2017–September 2018. Morbidity and Mortality Weekly Report, 67(47), p.1310.
Heath, A.C.G., 2016. Biology, ecology and distribution of the tick, Haemaphysalis longicornis Neumann (Acari: Ixodidae) in New Zealand. New Zealand veterinary journal, 64(1), pp.10-20.
Hoogstraal, H., Roberts, F.H., Kohls, G.M. and Tipton, V.J., 1968. Review of Haemaphysalis (Kaiseriana) longicornis Neumann (resurrected) of Australia, New Zealand, New Caledonia, Fiji, Japan, Korea, and northeastern China and USSR, and its parthenogenetic and bisexual populations (Ixodoidea, Ixodidae). The Journal of parasitology, pp.1197-1213.
Lee, M.R., Li, D., Lee, S.J., Kim, J.C., Kim, S., Park, S.E., Baek, S., Shin, T.Y., Lee, D.H. and Kim, J.S., 2019. Use of Metarhizum anisopliae sl to control soil-dwelling longhorned tick, Haemaphysalis longicornis. Journal of invertebrate pathology, p.107230.
Park, G.H., Kim, H.K., Lee, W.G., Cho, S.H. and Kim, G.H., 2019. Evaluation of the acaricidal activity of 63 commercialized pesticides against Haemaphysalis longicornis (Acari: Ixodidae). Entomological Research.
Rainey, T., Occi, J.L., Robbins, R.G. and Egizi, A., 2018. Discovery of Haemaphysalis longicornis (Ixodida: Ixodidae) parasitizing a sheep in New Jersey, United States. Journal of medical entomology, 55(3), pp.757-759.
Singh, N.K., Miller, R.J., Klafke, G.M., Goolsby, J.A., Thomas, D.B. and de Leon, A.A.P., 2018. In-vitro efficacy of a botanical acaricide and its active ingredients against larvae of susceptible and acaricide-resistant strains of Rhipicephalus (Boophilus) microplus Canestrini (Acari: Ixodidae). Ticks and tick-borne diseases, 9(2), pp.201-206.
Publication date: Sept. 19, 2019
Revised: Sept. 19, 2019
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