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[AgriLife Today] Armyworms are on the march

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By: Steve Byrns

Writer: Steve Byrns, 325-653-4576, s-byrns@tamu.edu

Contact: Dr. Charles Allen, 325-653-4576, ctallen@ag.tamu.edu

SAN ANGELO – Armyworms are now on the march, decimating huge swaths of Texas crops and pastures, said a Texas A&M AgriLife Extension Service entomologist at San Angelo.

Dr. Charles Allen said reports of damage are streaming into his office and to colleagues across the state.

“Hay farmers and stockmen from east of San Angelo, stretching across the Rolling Plains, Blacklands, East and South Texas are reporting damage from armyworms in Coastal Bermuda grass and early wheat planted for grazing,” Allen said. “The fall armyworm, all too familiar to many producers, is the primary culprit.


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“During warm weather, the caterpillar stage lasts about 14 days, but eats about 80 percent of its total intake during the last three or four days. That’s when the worms are at their largest and can do the most damage to a crop. It’s also when huge numbers of them can transform a hay field from a thing of beauty to a severely damaged nightmare seemingly overnight.”

Allen said the caterpillar has broad bands down its body and a light colored inverted “Y” on its head. It also has some raised dark spots along with a few black hairs down its back.

“They are not picky eaters,” he said. “They have a wide range of host plants which include, but are by no means limited to pasture grasses, corn, grain sorghum, rice, wheat, turf grass, and even weeds and landscape plants as well.”

The adult moth has a wingspan of about an inch and a half, with mottled gray forewings and light colored, translucent hind wings, he said.

“Unlike the seemingly indiscriminate diet, of the caterpillars, the female moths can be pretty selective about where they lay their eggs, opting for only the best, most productive pastures and crops for their future brood to flourish in,” he said. “However, wet weather can bring on exploding populations like we are currently experiencing. During these outbreaks, ‘housing shortages’ can occur so moths may lay their eggs on just about any available host plant.”

Allen said the eggs are laid in clusters and covered with light-colored wing scales. Adult moths typically live 10-21 days, during which females lay 1,500-2,000 eggs — mostly in the first half of her adult life.

“It’s also important to note that fall armyworms are great travelers. Their long-range flight takes many well into Canada each year where they feast on crops, grasses and weeds. But whether they feast in Canada or Texas, cold weather eventually zaps them as they can’t survive latitudes through the winter that are much farther north than South Texas and southern Florida.”

Allen said hay fields and pastures should be judiciously scouted for fall armyworms early in the morning or late in the evening. That’s because they hide under clods or dead vegetation to escape the heat of midday.

“When two to three armyworms longer than half an inch are found per square foot, it’s time to take action as forage losses can be prevented by using an insecticide,” Allen said. “As with scouting, insecticides will be most effective if applied when the worms are actively feeding on host plants in the early morning or late evening.

“When a hay crop is approaching harvest, cutting rather than spraying is a good option.”

As far as what to spray, Allen recommends pyrethroid insecticides as they are relatively inexpensive and are normally an effective option for fall armyworm control in wheat, Coastal Bermuda grass and other hay and pasture crops.

“There are lots of products that have a pyrethroid active ingredient,” he said. “You can tell if it is a pyrethroid by looking at the active ingredients list on the insecticide label. Many of the pyrethroid active ingredients end in ‘thrin.’

“Intrepid, Prevathon, Besiege, Tracer, malathion and carbaryl are other effective options,” he said. “Be sure to read and follow all label instructions, paying particular attention to the hay cutting and/or grazing restrictions listed on these insecticide products. Some, but not all control products are labeled for turf grass, but read the label to be sure.”

For more information, Allen recommends a fact sheet on the fall armyworm in pastures and hay crops written by Dr. Allen Knutson, AgriLife Extension entomologist at Dallas, athttp://foragefax.tamu.edu/files/2015/08/Armyworm-Fact-Sheet-2015.pdf

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Farm & Ranch

                                                                          American Lotus

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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.

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Farm & Ranch

Tracks in the Sand

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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.

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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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