Beef Producers Be Aware: Dangerous Asian Longhorned Tick Continues Migrating West

Wed, 18 Jun 2025 13:24:33 GMT

The Asian Longhorned Tick (ALHT) poses a serious threat to cattle health. ALHTs carry Theileria, which is a protozoan parasite that infects red and white blood cells. It can lead to anemia and, in some cases, death.

ALHTs are native to eastern Asia, eastern China, Japan, the Russian Far East and Korea but were introduced to Australia, New Zealand and western Pacific Islands. In other countries, it can also be called a bush tick, cattle tick or scrub tick.

In the U.S., ALHT was first detected in New Jersey in 2017. Since then, it has spread to more than 20 states with recent confirmations in Illinois , Michigan and Iowa .

According to USDA’s Animal and Plant Health Inspection Service (APHIS) ALHTs are known to carry pathogens, which can cause disease and may also cause distress to the host from their feeding in large numbers. For example, a dairy cow may have a 25% decrease in milk production after becoming a host.

A female can reproduce without a mate and lay up to 2,000 eggs at a time. This can cause great stress on a heavily infested animal and result in reduced growth and production. A severe infestation can kill the animal from excessive blood loss.

Asian longhorned tick life stages and relative actual size.

(Photos of unfed ticks by Centers for Disease Control. Photos of engorged ticks by Jim Occi, Rutgers, Center for Vector Biology.)

What does it look like?

Unfed ALHTs range from a light reddish-tan to a dark red with brown, dark markings. While the adult female grows to the size of a pea when full of blood, other stages of the tick are very small — about the size of a sesame seed.

Adult females are a grey-green with yellowish markings. Male ticks are rare.

APHIS reports it only takes a single tick to create a population in a new location.

The above photos are of a AHLT engorged (on the left) and an adult AHLT not engorged.

(New Jersey Department of Agriculture)

ALHTs need warm-blooded hosts to feed and survive. They have been found on various species of domestic animals — such as sheep, goats, dogs, cats, horses, cattle and chickens — and wildlife. The tick has also been found on people.

What are the health risks?

APHIS says ALHTs are not known to carry Lyme disease, but they can cause tickborne diseases affecting humans and animals such as:

Rocky Mountain spotted fever
Heartland virus
Powassan virus

APHIS says those diseases have not been confirmed outside of a laboratory setting in the U.S. In addition, U.S. ALHT populations can transmit U.S. Theileria orientalis Ikeda strain (Cattle theileriosis) in the laboratory.

In an Iowa State University release , Grant Dewell, Extension beef veterinarian and associate professor, says cattle affected by Theileriosis will show signs of lethargy, anemia and difficulty breathing. They may develop ventral edema, exercise intolerance, jaundice and abortions.

“Although signs of Theileriosis are similar to anaplasmosis, younger animals and calves often display more severe signs compared to mature cows and bulls,” he says. “Due to anemia from both tick infestation and Theileria, the risk of death can be elevated. If cattle producers suspect either Theileria or ALHT, have a veterinarian collect appropriate samples and submit them to a veterinary diagnostic lab.”

According to an Oklahoma State University press release , under laboratory conditions ALHT is a competent vector of numerous pathogens that can cause disease in humans, including Rickettsia rickettsii (Rocky Mountain Spotted Fever), Heartland Virus and Powassan Virus.

In “ Clinical Infectious Diseases, ” Bobbi Pritt, MD, MSC, with the division of clinical microbiology at the Mayo Clinic in Rochester, Minn., reported a human bite that occurred in New York in 2019. She says though the report of a human bite isn’t surprising, it proves the invasive longhorned tick continues to bite hosts in its newest location.

“This is extremely worrisome for several reasons,” she writes. “One reason is Asian longhorned ticks can carry several important human pathogens, including the potentially fatal severe fever with thrombocytopenia syndrome (SFTS) virus and Rickettsia japonica, which cases Japanese spotted fever. While these pathogens have yet to be found in the United States, there is a risk of their future introduction.”

Also, Pritt says several other human pathogens have been detected in the ticks, but it’s not clear if the ALHT species are able to transmit them to humans. They include Anaplasma, Ehrlichia, Rickettsia, and Borrelia species. Lyme disease is caused by Borrelia burgdorferi bacteria.

She warns the organisms are present in states where ALHTs have been found and that it’s possible the tick — known to be an aggressive biter— might be able to transmit Heartland virus given its close relationship to SFTS virus.

How to Tackle Ticks

According to APHIS, various strategies effectively mitigate tick populations on hosts and in the environment.

Regular tick treatments should be effective against ALHTs. Consult your veterinarian or agriculture extension agent about which products to use.
Check your livestock for ticks regularly.
Safely remove ticks from people and pets as quickly as possible. If you think you’ve found an ALHT, seal it in a zip-top bag and give it to your veterinarian for identification.
Habitat modifications can help prevent ticks on feedlots and pastures. This may include mowing grass, removing trees, reducing shade by thinning trees, understory removal and placing mulch barriers.
Apply acaricide using label instructions to tick habitats, such as woodland edges and grassy patches, during times when ticks are most actively seeking hosts. Although it varies by year, ALHTs are generally active from March to November. Consult your state and local regulations for approved acaricides.

“Cattle producers should aggressively control external parasites this summer,” Dewell summarizes. “Insecticide ear tags alone are not enough to control ticks. Consider incorporating a back rubber or regularly applying a pour-on during the summer. Pyrethroid-based products are also available that include a tick control label. If an increase in tick infestations is observed, an avermectin pour-on may be the best intervention.”

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Horizon Award Honors Husband-and-Wife Team for Their Drive and Focus

Tue, 25 Jul 2023 16:59:42 GMT

Each year, Top Producer recognizes a producer under the age of 35 who demonstrates excellence in the business of farming, specifically marketing, finance, technology and family and employee relations. Congratulations to Martin Angus, the 2022 recipient of the Tomorrow’s Top Producer Horizon Award. Brendan and Elaine Martin were recognized at a ceremony held Feb. 14 during Top Producer Summit in Nashville.

Brendan Martin learned early on that cows equal cash flow. He started building his herd in high school with the goal of one day owning his own farm.

Growing up in the Shenandoah Valley near Mt. Solon, Va., Brendan began building equity and his farming dream through heifers, custom hay bailing and hard work. His reputation attracted the attention of a neighbor who was looking to slow down. The neighbor wanted a young, energetic farmer to purchase his cow herd and lease his 280-acre farm. Brendan stepped up to the plate.

Today, Brendan’s diversified and multi-faceted operation is a team effort with his wife, Elaine. In addition to their 280-acre home base, they lease around 600 acres of pasture and farmland. They raise corn, alfalfa, small grains and hay, and their cattle operation includes a registered Angus and commercial Angus herd, 210 fed cattle and 1,030 feeder calves. In the past couple of years, they have invested in their cattle facilities to increase cow comfort and feeding efficiency.

In 2019, the Martins added Blue Cedar Beef, a direct-to-consumer beef business. They ship beef all over the nation every week of the year. They also do custom mowing and litter spreading and recently added a trucking business. Their team includes two full-time and two part-time employees. Brendan also owns a large animal mobile veterinary practice, Valley Herd Health. Elaine specializes in record keeping, payroll and financial management for the farm, as well as keeping a close eye on the cattle herd.

As the Martins look toward the future, their goal is not to have the most cows or acres. They are motivated by their return on investment and creating generational impact in the Shenandoah Valley in Virginia.

Take a trip to Martin Angus with this video from AgDay.

The Horizon Award is sponsored by Corteva and Pioneer. The winner receives an all-expenses-paid trip to Top Producer Summit; virtual mentoring sessions from Kristjan Hebert, the 2020 Top Producer of the Year; and a DJI Phantom 4 Drone, courtesy of Corteva.

Northeast (U.S.)

Beef Producers Be Aware: Dangerous Asian Longhorned Tick Continues Migrating West

What does it look like?

What are the health risks?

How to Tackle Ticks

Horizon Award Honors Husband-and-Wife Team for Their Drive and Focus

The Online Top Producer Summit is set for Feb. 22-23 and will include live, on-demand and recorded sessions from the event in Nashville. Register now!