Farm & Ranch
Experts: Identification could save producers water, money
By: Kay Ledbetter
Writer: Kay Ledbetter, 806-677-5608, skledbetter@ag.tamu.edu
Contacts: Dr. Qingwu Xue, 806-354-5803, QXue@ag.tamu.edu
Dr. Charlie Rush, 806-354-5804, crush@ag.tamu.edu
Dr. Fekede Workneh, 806-354-5815, fworkneh@ag.tamu.edu
AMARILLO – As spring growth of wheat begins, Texas A&M AgriLife Research studies indicate now might be the time to determine possible wheat streak mosaic virus infection and future management of the crop.
During the past three years, the AgriLife Research plant pathology and crop physiology programs in Amarillo have concentrated studies on the occurrence of wheat streak mosaic disease and how it impacts a crop’s water-use efficiency. The disease is caused by a virus transmitted by the wheat curl mite.
Knowing that major productivity losses can occur to both grain and forage yields in wheat with this virus, the research studies are trying to determine if the infection can be predicted at the early stages, and at what stages the infection is most damaging.
Both of these projects were partially funded by the U.S. Department of Agriculture’s Ogallala Aquifer Program and reported upon at the program’s recent annual conference in Manhattan, Kansas.
The physiological study by Xue titled “Physiological responses of hard red winter wheat to infection by wheat streak mosaic virus” will appear in Phytopathology, a periodical journal published by American Phytopathological Society.
Dr. Charlie Rush, AgriLife Research plant pathologist, and his team, including Dr. Fekede Workneh, senior r
esearch scientist in plant disease epidemiology, initiated a study to investigate whether the progressive nature of the disease could be exploited and early infections used to predict future impact on grain yield and plant biomass.
As temperatures warm during the next few weeks, symptoms of wheat streak will become more obvious, so growers should be on the lookout, Rush said.
“It is difficult to tell for sure in the field whether a particular symptom is caused by wheat streak or something else, and the only way to know for sure is to take the sample into the plant diagnostic lab and have it tested.” he said.
Barley yellow dwarf, a virus-caused disease transmitted by several different aphid species, and Russian aphids and greenbugs have been widespread this year, and they do cause discrete spots of yellowing wheat. At times these symptoms can easily be confused with wheat streak, even by a trained observer, Rush said.
When a producer is looking at wheat and trying to determine what is causing sick plants, he said uniformly yellowing leaves in a definite pattern, such as yellow stripes or spots, is probably not due to a mite-vectored virus disease such as wheat streak.
But streaks of green and yellow and little yellow flecks on individual leaves, a mosaic pattern, probably indicates its presence, Rush said. Wheat streak often starts at the edges of fields and symptoms spread across the field over time.
“It is important to know the difference between aphid damage and wheat streak because with aphids you can always spray to knock down populations to a manageable level, while with wheat streak, there is little a grower can do after symptoms begin to appear,” he said.
“By that time, the virus has already infected the plants and depending on how widespread the disease is in the field, the only thing the farmer can do is decide on whether or not to keep irrigating.”
If symptoms are widespread across a field in early April, yield potential is very low and additional inputs are questionable, the researchers said. If symptoms don’t begin to show up until early or mid-May, yields will still be reduced compared to a healthy, non-diseased crop, but it won’t be a total loss.
The disease causes root reduction, which significantly impedes soil water uptake, leaving growers uncertain as to when they should continue irrigating or stop and graze the wheat out, Workneh said.
“In order to answer that question, we are currently trying to determine if we can predict the disease early,” he said. “The good thing about this disease is it is progressive over time, and in many cases begins on the edges and progresses into the field. This will help us assess the disease at different severity stages, which could be related to yield and forage biomass.”
Workneh said the results so far are promising.
“We believe we will be able to tell growers that either the disease occurrence is severe and the field may not yield very well or the disease occurrence is not that severe, enabling them to make early decisions on management options including the need for irrigation,” he said.
“But we need to continue the research for several years and include weather data to see how the temperature over the years affects the data,” Workneh said. “It is a good start, but we need to continue the research.”
Dr. Qingwu Xue, AgriLife Research plant physiologist, said his studies concentrated on the timing of the virus infestation and how that affected yield.
“We mechanically infested the wheat plants with the virus at different stages of the wheat,” Xue said. “We inoculated it with the virus at the three-leaf, four-leaf, five-leaf, jointing and booting stages. Then we looked at the physiological responses of wheat plants.
“What we found in our two greenhouse studies is the grain and forage yields can be reduced tremendously when the virus infects the plants at an early stage – the three-leaf to five-leaf stages,” he said. “If you irrigate wheat, then it might not be worth it when the field is infested early.”
Xue said the wheat yields can still be affected if the infestation comes at jointing stage, so spring infestations also can reduce grain yield.
Early wheat streak mosaic virus spread on the greenhouse-inoculated plants resulted in a significant reduction in shoot biomass, root dry weight, tillers, water-use efficiency and yield. The infection did not affect rooting depth but reduced the number of nodal roots, he said.
While the research in both programs will continue, AgriLife Research offers an early disease detection system for producers through a Listserv and website, http://bit.ly/1sVKFfA.
Producers can subscribe and will be notified of the name of the county, types of pathogen found and the discovery date. Additionally, samples of diseased wheat can be submitted to the Plant Diagnostics Lab at the Texas A&M AgriLife Research and Extension Center, 6500 Amarillo Blvd. West in Amarillo for testing.
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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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