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Experts: Identification could save producers water, money

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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.

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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.

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“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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Grazing North Texas – American Lotus

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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.

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The Many Benefits of Rabbit Manure

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By Landon Moore

Rabbits offer a lot to the home gardener, and perhaps the most useful of all is their waste. Rabbit manure is likely the single most versatile and valuable fertilizer of any animal manure. It’s a “cold” manure, meaning it can be applied directly to plants in any form without the risk of burning them. In contrast, manure from sheep, horses, cows, and especially poultry must be aged before it’s applied, or it may damage plants. Because rabbit manure doesn’t need to be aged, it retains more of its nutrients and is therefore twice as rich as chicken manure and four times more potent than horse or cow manure. Rabbit manure is safe to apply to soil growing edible crops, has virtually no smell, and contains no harmful seeds. It can be used immediately, or be dried, powdered, made into tea, or turned into worm castings. A single trio of rabbits and their offspring can produce up to two cubic yards of fertilizer per year, along with 100 to 200 pounds of meat.

Rabbit manure is in such high demand as a fertilizer, particularly for roses, that it’s often sold online at a premium price. Some rabbitry owners even charge people to come scoop the manure themselves, paying by the bag. Larger rabbitries might sell by the truckload, but many owners keep it all for their own gardens. You may wonder what makes this little mammal’s excrement so uniquely useful. To understand, we first need to look at the qualities that make it special and then explore its various applications.

To begin with, let’s take a closer look at a rabbit’s biology. Contrary to popular belief, rabbits are not rodents but belong to the order Lagomorpha and family Leporidae, along with hares. All domestic rabbits are domesticated European rabbits (Oryctolagus cuniculus) and are unable to produce fertile offspring with American cottontails. Rabbits are considered “pseudo-ruminants” because they have a single-chambered stomach, but they also have an organ called the cecum, which functions similarly to a rumen and makes up about 40% of their digestive tract. They are crepuscular, meaning they are most active at dawn and dusk, typically feeding in the evening.

Rabbits actually produce two kinds of manure. The familiar dry pellets make up most of their waste, while the other type, known as “cecotropes,” is a moist and smelly substance resembling tiny bunches of grapes. Cecotropes are not fully digested, and because rabbits cannot chew their cud, they reingest the cecotropes as they are excreted. This fermented substance allows the rabbit to absorb more nutrients than it would through initial digestion. While cecotropes are occasionally found in cage trays, the feeding behavior that leads to them is usually only witnessed by the rabbit owner.

The dry pellets are the true manure that most people are familiar with. These small, round, dry pellets have almost no smell when kept dry. When crushed, they break down into a powder resembling tiny grass fragments because, in essence, that’s what they are. Some people crush the pellets before applying them to speed up their absorption into the soil, while others appreciate their “slow-release” feature. Additionally, the manure’s water solubility can be exploited in several ways. Soaking a wheelbarrow full of manure creates a potent sludge that can be easily applied to flat surfaces. If the odor is not an issue, the smell will dissipate once the manure is either dissolved by moisture or dried by the sun. Another method is to make manure tea: fill a cloth bag with manure, seal it, and submerge it in a barrel of water for a few weeks. A simpler method involves placing damp manure at the bottom of a barrel, filling it with water, and letting it sit in the sun for a couple of weeks. Stir occasionally, and you’ll have a powerful liquid fertilizer ready for use.

Domestic rabbits should be fed a modern, pelleted feed, which provides all the nutrients they require. This diet eliminates the risk of noxious seeds being present in the manure, making it safe to apply directly to the lawn, especially during winter. Winter and spring rains will break it down, and by late spring, you’ll have a healthy carpet of turf.

Rabbit manure’s nutrient content varies depending on factors like storage, age, and diet, but it generally contains around 2% nitrogen (N), 1.3% phosphorus (P), and 1.2% potassium (K). The Oregon Extension Service gives a range of 3-4.8% nitrogen, 1.5-2.8% phosphorus, and 1-1.3% potassium. Even at the lower end of the scale, rabbit manure has higher nitrogen content than poultry manure and twice the nitrogen content of cattle manure. One reason rabbit manure doesn’t burn plants is due to the biology of birds, which lack bladders and produce more ammonia in their waste. In contrast, rabbits release ammonia in their urine, which is why their manure may have a stronger odor.

Because of its balanced nitrogen-to-phosphorus ratio, rabbit manure promotes a wider variety of species in the same application area. Applying it directly to heavy clay soils will improve them quickly, especially when combined with other organic matter. It can also improve sandy soils by adding texture and helping them retain moisture. Anyone raising rabbits will have a steady supply of manure, as they are efficient producers. A small herd of 17 animals, including their litters, can produce about one ton of manure annually.

Beyond fertilizing, rabbit manure has several other uses. It is considered the best food for earthworms and can be combined with moisture-holding bedding like peat moss, shredded paper, or hay taken from used nestboxes. Many rabbitries (including my own) keep worm beds right under the cages. The resulting castings are rich in nutrients and can be used as-is or incorporated into soil amendments. A couple of feet of manure under a foot of soil in a hotbox can generate enough warmth to start and grow seeds, even in cold climates like Vermont.

In Europe and Asia, the rabbit meat industry is a billion-dollar market. While the Czech Republic leads in per capita consumption (over 8 pounds per person annually), China is the leading producer of rabbit meat. A recent study in China examined the effects of replacing peat moss in seed-starting soil with rabbit manure. The study found no significant difference in germination rates and noted that the manure provided increased nutrients for seedlings. The ideal ratios for seed-starting soil were found to be one-third manure, one-third perlite, and one-third vermiculite, or half manure and half perlite.

Rabbit manure is often overlooked as a nuisance, but as we can see, it’s an incredibly versatile soil conditioner, excellent fertilizer, ideal food for earthworms, and a superior seed-starting medium. Anyone raising rabbits should consider this another benefit, in addition to having a home meat supply, exhibition livestock, or pets.

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Farm & Ranch

Leopold’s Legacy: The Five Tools That Shaped Conservation

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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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