Farm & Ranch
[AgriLife Today] Texas cattle fever ticks are back with a vengeance
By: Steve Byrns
Writer: Steve Byrns, 325-653-4576, s-byrns@tamu.edu
Contacts: Dr. Pete Teel, 979-845-3253, pteel@tamu.edu
Dr. Sonja Swiger, 254-968-4144, slswiger@ag.tamu.edu
COLLEGE STATION– Texas cattle fever ticks, which made Texas longhorns the pariah of the plains in the late 1800s, are once again expanding their range with infestations detected in Live Oak, Willacy and Kleberg counties, said Texas A&M AgriLife experts.
As of Feb. 1, more than 500,000 acres in Texas are under various quarantines outside of the permanent quarantine zone.
Dr. Pete Teel, Texas A&M AgriLife Research entomologist at College Station, said the vigilance and cooperation of regulatory agencies, namely the Texas Animal Health Commission and the U.S. Department of Agriculture and the Animal and Plant Health Service, in collaboration with the livestock and wildlife industries are needed to detect, contain and eliminate cattle fever ticks.
Because there is no cure for tick fever, a series of quarantine levels are used to prevent animal movement and the spread of a fever tick infestation, and to permit animal treatments for tick elimination. For an explanation of these quarantines see http://bit.ly/2jkqTNX.
Pictured, is a cattle fever tick quarantine road sign in South Texas. (Texas A&M AgriLife photo)
“We’ve been responding to calls for several weeks now stemming from this outbreak,” said Dr. Sonja Swiger, AgriLife Extension veterinary entomologist at Stephenville.
“Most of Texas has been shielded from this problem for so long that there is little memory of what it took to be able to enjoy the benefit,” she said. “Now when producers are confronted with the issue without knowledge of the history and biology and risks associated with cattle fever, they are overwhelmed.”
Teel said the historic cattle drives from Texas to railheads in Missouri and Kansas in the late 1800s brought unwanted attention when local cattle died of a strange fever associated with the arrival of Texas cattle.
“Texas cattle fever was ultimately linked to ticks brought along by the Texas longhorns,” Teel said. “These ticks were appropriately named Texas cattle fever ticks, due to their ability to transmit a fever-causing agent from infected to uninfected cattle.”
By 1906, Teel said, it was determined these ticks and Texas cattle fever were found throughout 14 southern states and were limiting the economic development of the region. It was also discovered that procedures separating cattle from these ticks was essential to disease prevention and tick elimination.
“State and federal eradication programs with industry support began in 1906 and slowly eradicated the disease by eliminating these specific ticks from the eastern seaboard to the Texas-Mexico border, a task declared completed in the 1940s,” he said. “A permanent buffer zone was created and has been maintained ever since along the international border from Del Rio to the mouth of the Rio Grande to prevent re-establishment of ticks from Mexico where both ticks and pathogens remain.”
Since the 1970s, there have been periodic incursions of these ticks into Texas. One such incursion is happening now, requiring quarantine and eradication to prevent their spread, he said.
“However, the success of this program has protected our cattle industry from the risks of disease outbreaks by preventing contact with the tick vector for so long that most people do not remember the tremendous effort and significant benefits, and are often unaware that this risk still exists,” Teel said.
“Decades of changes in land-use, brush encroachment, expansion of native and exotic game, diversification of animal enterprises and variation in climatic cycles are contributing to new challenges in keeping this problem at bay.”
How risky is the disease? Teel said the Southern Region of the U.S. is home to more than 400,000 cattle operations producing a third of all fed cattle in the country. This region is the original distribution location of these ticks before the eradication program, and climate modeling indicates it would still support these ticks today.
Mortality in cattle without prior exposure to the disease is estimated to range from 70-90 percent. There are no protective vaccines and no approved drugs to treat sick animals in the U.S., he said. The U.S. Department of Agriculture has estimated that if eradication of these ticks had not occurred, cattle industry losses across the southern U.S. today would be about $1 billion annually.
The technical name for Texas cattle fever is bovine babesiosis, a name related to the organisms that infect the red blood cells of cattle. It is their destruction of the red blood cells that results in anemia, fever and death, Swiger said.
“There are two closely related tick species capable of transmitting these pathogens, one called ‘the cattle tick,’ Rhipicephalus (Boophilus) annulatus, and the other called ‘the southern cattle tick,’ R. microplus,” she said. “Both of these tick species and associated pathogens were introduced to the Western Hemisphere on livestock brought by early explorers and settlers from different parts of the world.”
The origin of the cattle tick is the Mediterranean area where climates are relatively temperate, while the southern cattle tick is from the tropics of the Indian sub-continent. Thus, they were both successful in adapting to the southern climates of the U.S., as well as similar climates in Mexico, Central and South America, Teel said.
Teel said fever ticks remain on the same animal through their larval, nymphal and adult stages all the way through until the blood-engorged females drop off the host animal. Once off the host, females lay from 2,500-4,000 eggs, and then die. The males remain on the animal to mate with more females. It takes 20 days from the time the larvae arrive on the host animal until the first females start dropping off with the most females leaving the host at about Day 25. So, animal movement during this period allows ticks to be dropped into new locations.
“A successful hatch depends on moderate temperatures and high relative humidity more common to tree and brush covered areas than to open meadow or grass habitats,” Teel said. “If ticks pick up the pathogen from their host during blood feeding, the pathogen is passed through the egg to the larvae of the next generation. No other tick species in the U.S. are capable of transmitting the pathogen of Texas cattle fever.
“Cattle are the preferred host and back when cattle were basically the only host, the ticks were much easier to control,” he said. “Today white-tailed deer and several exotic ungulates including nilgai antelope serve as hosts. Nilgai, an imported exotic species that have naturalized in much of South Texas, are native to India and were historically noted as a host animal for the southern cattle tick in India. So what we’ve done is bring both the ticks and nilgai together again.”
While there are many challenges to optimizing tick suppression where there is a mix of cattle, wildlife and feral ungulate hosts, Teel said research and technology development are providing new tools to meet these challenges.
“AgriLife Research and the USDA’s Agricultural Research Service are collaborating to discover new and improved methods of detecting and eliminating cattle fever ticks,” he said. “These efforts include mining sequences of the DNA of both tick species to discover sites to disrupt functions such as tick feeding or egg laying, to identify targets for new pesticides, or genetic approaches for tick suppression or prevention of pathogen transmission.
“There is evidence that the manure of tick-infested cattle contains detectable differences in chemical makeup compared to non-infested animals and may provide for improved methods of tick detection,” he said. “And, the complex interactions of tick-host-habitat-climate relationships through simulation modelling are currently being investigated to improve tactics and strategies for tick elimination where both wildlife and cattle are involved.”
To learn more, Teel and Swiger recommend using Tick App, a free smartphone application available at http://tickapp.tamu.edu, and the Texas Animal Health Commission’s website athttp://www.tahc.texas.gov/regs/code.html for information on tick treatment options, tick quarantine and associated regulations, as well as the latest updates on current quarantines.
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Farm & Ranch
American Lotus
By Tony Dean
Farmers and ranchers are in a very close partnership with Mother Nature. If we really pay attention, she presents us some interesting scenarios.
For example, though they are totally different types of plants, water lilies and prickly pear have a lot in common. They both have strikingly beautiful flowers, both plants are edible, both of them are invaders into their respective habitats, and too much of either one can be an obstacle that we have to deal with.
Many north Texas ranches rely on excavated ponds for livestock water. Any time a pond contains a significant amount of shallow water so that sunlight reaches the bottom, some type of pond weed will develop. The plant family that includes water lilies and lotuses is a common invader in our livestock water.
Water lilies and lotuses are in the same plant family but they are two separate genera. There are easy ways to tell them apart:
- A primary difference is that water lily leaves commonly float on the surface, but lotus leaves can grow above the water line.
- Water lily leaves and flowers are thick and waxy, while lotus leaves and flowers are thin and papery.
- Water lily leaves have a distinct notch in the leaf, while lotus leaves are more rounded.
- Water lily flower petals are pointed, and lotus petals are more rounded.
The photos attached to this writing are from Clay County, and this plant is common across north Texas. American lotus is adapted to a wide area, from Honduras north through Mexico and across the eastern US and into Canada.
American lotus is a perennial, and it is cold tolerant and heat tolerant. It can grow in any pond or slow moving stream that contains shallow water areas. It prefers water with a depth of about 12 inches. Germination can occur from the large lotus seeds. Tubers, or roots, are established in the mud, and long slender stems extend upward. Leaves and flowers are both emergent in that they grow above the water line.
Lotus flowers are fragrant, and yellowish white with rich gold centers. They open in the morning and close by late afternoon, then open again the next day.
Lotus is an edible plant and has a history as a food source. The large tuberous roots, the size of a human arm, were baked like sweet potatoes. The leaves were eaten like spinach, and the large seeds were ground into flour. Stems taste somewhat like beets and were usually peeled before being eaten.
There is a large world-wide industry of cultivating lilies and lotuses in water gardens. According to Dr. Jerry Parsons, Professor and Extension Horticulturist with Texas A&M AgriLife Extension, cultivation of these plants dates back as early as ancient Egypt. Today, anyone with determination and a little money can have a water garden.
In 2011, the 82nd Texas Legislature designated the water lily “Texas Dawn” as the official Texas State Water Lily. Texas Dawn is a hybrid developed by Texas resident Kenneth Landon, a world-renowned expert in the field of water lilies and the director of the International Water Lily collection in San Angelo.
Ducks and other wildlife utilize the large acorn like seeds of American lotus, and submerged portions of all aquatic plants provide some form of wetland habitat. Many of us have tried to pull a bass out of a group of water lilies or lotuses, and I’m sure others have had better luck than I did. Although there can certainly be benefits to lilies, lotuses, and other aquatic plants, they can also infest ponds to the extent that the pond is not functioning correctly.
So, while the rest of the world works hard to grow these plants, ranchers sometimes need to control populations in their stock ponds. Once it gets a foot hold, American lotus can spread aggressively in wetland areas.
The primary issue that encourages American lotus, and most other water weeds, is shallow water. Look closely at a good livestock pond and you will find that the deeper water is basically free of infestation. Any pond will have a certain amount of shallow water that encourages water weed growth, depending upon the terrain at the pond site and how the pond was constructed. Some ranchers who enjoy and utilize wetland habitat may prefer to have ponds with significant shallow water area.
Almost all livestock ponds have a certain life expectancy. Siltation, or movement of soil into the pond bottom through rainfall runoff, is a natural occurrence. How fast siltation occurs into each pond, and how deep the pond was to start with, determines the length of time that the pond will contain adequate depth for dependable water for livestock.
Ponds that develop infestations of water weeds over a large percent of the surface may not have adequate depth to remain a viable water source for livestock during drought periods, especially in western north Texas where evaporation rates are higher.
Mud, or silt, from the pond bottom, can be removed to deepen the water, but this is a very expensive process. It is often more economical to construct a new pond rather than try to remove the silt from an old one. Most of us do not have the funds to continually construct deep water livestock ponds, so we must try to keep existing structures functioning and providing good drinking water for livestock, for as long as we can. Control of pond weeds like American lotus may be necessary, and it can be accomplished.
There is currently no feasible biological control. American lotus can be cut and removed, but this process us usually temporary because lotus can reestablish from seeds and roots.
American lotus can be safely controlled by chemicals. This must be done carefully. If a pond containing a large amount of any pond weeds is treated to remove all of the vegetation, a fish die-off could occur. When the dying weeds decompose, they use up the oxygen in the water and fish can suffocate. If possible, treat only a portion of the area, wait about two weeks, and treat another portion.
Farm & Ranch
Tracks in the Sand
This morning, I walked out into my arena and noticed something that gave me pause. The roping steers had been in there the day before, and even though the ground was wide and level, the sand carried their story. Hoofprints crossed every direction, but in several spots, the same trail was pressed deeper than the rest. Twelve steers had been turned out, yet more than a few chose the exact same path, wearing it down until it stood out from all the other tracks.
Cattle are creatures of habit. Anyone who has spent time around them knows this. They like routine: the same feed, the same water trough, the same shade tree in the pasture. When they are turned loose, they rarely wander without purpose. More often than not, they move together, following the same course as the steer in front of them. There are reasons for this: efficiency, safety, instinct. Walking a beaten path conserves energy, and following the herd is their natural defense. Even in an arena with no real destination, those instincts come through. By the end of a short turnout, you will see the evidence, lines where they have chosen the easiest way to travel and stuck with it.
Out on the range, those lines last longer. Before fences and highways, cattle drives cut deep paths across the land. The Chisholm Trail, which carried herds north from Texas through Oklahoma into Kansas, was walked by millions of cattle in the late 1800s. More than a century later, faint traces of those trails remain, worn so deep by hooves and wagon wheels that the land still carries the mark. On ranches today, you can see the same effect in pastures where cattle walk the same lines between water and grazing. From the ground those trails might look like nothing more than dusty ruts, but from the air, they sometimes stand out as sharp lines winding through otherwise open fields. Cattle do not simply pass over the land; they shape it. Every step adds up.
That simple truth extends beyond livestock. We all make tracks. Our habits and routines are our trails, worn in by repetition, sometimes efficient, sometimes limiting. Like the cow paths, they can serve a purpose, keeping us steady and helping us move forward. But when repeated without thought, they risk becoming ruts, keeping us from stepping into new ground. History offers perspective here too. The old cattle trails built towns and economies, but once railroads and fences changed the landscape, those paths were no longer useful. Sticking to them would have meant going in circles. Progress required something new.
The Tracks We Leave
Standing in the arena, I thought about the kind of tracks I leave behind. Most of mine are not visible in the dirt. They are pressed into my daily life, how I work, the way I handle challenges, the example I set. Some are helpful and worth keeping. Others may have outlived their purpose. The difference comes in knowing when to stay in the track and when to step out of it.
Tomorrow I will drag the arena and smooth it all clean again. The next time the steers are turned in, they will make the same trails. That is their nature. But unlike them, I have a choice. I can decide which paths are worth walking, which ones to change, and what kind of tracks I want to leave for others who might follow.
Tracks tell a story. Sometimes they are only temporary, fading with the next rain. Other times they last for generations, reminders of where herds and people once walked. This morning, the cattle showed me again that even the smallest things on the ranch carry meaning. Their tracks in the arena were not just marks in the sand. They were a lesson: every step matters, and the paths we choose shape more than just the ground beneath our feet.
Farm & Ranch
Leopold’s Legacy: The Five Tools That Shaped Conservation
By Raenne Santos
Known as the father of wildlife management, Aldo Leopold’s teachings reshaped our understanding of conservation and our role in nature. His philosophy, rooted in ethics, ecology, and action, emerged in response to the environmental degradation of the early 20th century in the American West. Overgrazed pastures, eroding soils, and changing wildlife populations revealed the consequences of treating natural resources as limitless.
Recognizing these challenges, Leopold theorized a transformative approach to land stewardship, emphasizing that the land is not merely a commodity, but a community in which we all belong. His works, A Sand County Almanac and Land Ethic, are still referenced to this day by modern conservationists. In Land Ethic, he introduced a practical framework for wildlife management known as the Five Tools of Wildlife Management, which offers land stewards a structured approach to maintaining and restoring ecological balance.
Symbolizing brush management, the axe is one of Leopold’s tools for controlling invasive species, shaping habitats, and mitigating wildfire risks. By selectively removing vegetation, land managers can enhance biodiversity, create open spaces for native species, and maintain healthy ecosystems.
Representing grazing animals, the cow (when used properly) mimics the natural disturbances once provided by bison. Grazing animals promote healthy ecosystems by aiding in nutrient cycling and soil disturbance. Responsible grazing practices prevent overuse and contribute to sustainable land management.
The plow signifies mechanical disturbance and soil preparation, crucial for habitat restoration and agricultural productivity. Used strategically, it aids in cultivating crops and creating conditions favorable to wildlife. However, misuse can lead to erosion, requiring careful application in conservation efforts.
Fire, a powerful natural tool, plays a crucial role in maintaining biodiversity and landscape resilience. Land managers use prescribed fire to control invasive species, rejuvenate plant communities, and shape habitats. Fire promotes the natural cycles of ecosystems and supports species diversity.
The final tool, the gun, is used to manage game populations and control predators. During Leopold’s time, unregulated hunting contributed to species extinction and posed threats to others. Today, hunting is strictly managed through game laws and seasonal regulations to ensure sustainable populations.
Leopold’s Five Tools of Wildlife Management continue to influence conservation practices today. While techniques have evolved, the fundamental principles remain the same—balancing human involvement with ecological processes to sustain healthy ecosystems. His approach emphasizes the importance of working with nature rather than against it. By embracing ethical land stewardship, modern conservationists honor Leopold’s vision, ensuring that future generations inherit thriving landscapes.
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