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[AgriLife Today] AgriLife Extension offers management options for sugarcane aphids in the High Plains

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By: Kay Ledbetter

Writer: Kay Ledbetter, 806-677-5608, skledbetter@ag.tamu.edu
Contact: Dr. Ed Bynum, 806-677-5600, ebynum@ag.tamu.edu

AMARILLO – Texas A&M AgriLife Extension Service entomologists are trying to help producers prepare for the likelihood of the sugarcane aphid on the Texas High Plains in 2016.


Dr. Ed Bynum, Texas A&M AgriLife Extension Service entomologist in Amarillo, looks at sugarcane aphids covering a leaf during a 2015 sorghum field day. (Texas A&M AgriLife Communications photo by Kay Ledbetter)

The first step will be to make sure all producers are able to identify the sugarcane aphid and know the difference between other insects out there that look very similar, such as the greenbug, Bynum said. The sugarcane aphid has dark cornicles, tips of antennae and feet, and no stripe down its back; the greenbug doesn’t.

He said all sugarcane aphids are females. They live an average of 28 days, are born pregnant and have a live birth. The new aphids only take four to 12 days before they become an adult and can start giving birth to one to three offspring a day.

Sugarcane aphids feeding on a sorghum leaf left a shiny sticky honeydew behind and a black sooty mold is beginning to show. (Texas A&M AgriLife Communications photo by Kay Ledbetter)

Their damage is caused by the piercing sucking mouthparts, Bynum said. This action puts the plant in poor health and can keep it from fully developing. Excess plant sap during feeding is bypassed out on to the leaves as a sticky substance called honeydew. A black sooty mold will grow on the honeydew causing a reduction of photosynthesis.

Excessive feeding can cause significant yield loss and weakens the stalk, predisposing it to lodging, he said.

Persistent populations can exist on sorghum, johnsongrass, Sudan grass, pearl millet and broomcorn. Non-persistent populations can be found on sugarcane, corn, large crabgrass, barnyard grass, Japanese millet, napier grass. It does not establish on wheat, oats and rye.

Bynum said arrival time of the insect determines the risk. If the sugarcane aphids show up in the pre-boot stage of the crop, 81-100 percent yield loss can be expected if not treated. If the arrival occurs at the boot stage, the potential yield loss could be 52-69 percent; at panicle emergence, 67 percent; and at soft dough stage, 21 percent.


Sugarcane aphids can multiply rapidly if sorghum fields are left untreated. (Texas A&M AgriLife Communications photo by Kay Ledbetter)

It is still uncertain whether sugarcane aphids overwinter in the southern High Plains, so AgriLife Extension has nine overwintering monitoring sites set up from Dalhart down to San Angelo. He said they will begin checking the cages in April in both the South Plains and the Panhandle. If no aphids are found, the cages will be checked again in May and June.

Bynum said in field trials at Lubbock last season, there was a 74 percent yield loss between treated and untreated sorghum at the boot stage.

“If you start seeing physical damage to the field or crop canopy, you have a heavy infestation already,” he said.

The options to avoid damage are: plant outside the normal planting window; use insecticide seed treatments; plant resistant hybrids and determine when to treat.

“If you plant early, the field could be in later growth stages when aphids arrive, which would have less risk of being severely damaged,” Bynum said.

Lady beetles are one of the beneficial insects that feed on sugarcane aphids. (Texas A&M AgriLife Communications photo by Kay Ledbetter)

The early planted sorghum may reach the boot or flowering stage before a mid-June aphid arrival, while standard planted sorghum would be in the whorl to pre-boot stage, he said. An August to September aphid arrival would allow early planted sorghum to escape damage until grain filling, while a standard planting would have the crop in the boot to flowering stage. Late-planted sorghum would be in the whorl stage.

The later the infestation, he said, the more beneficial insects might be out, lessening the need for chemical control. Also, the aphid reproduction may slow with shorter days and cooler nights.

Lady beetle eggs found on the same leaves as sugarcane aphids can indicate there will be beneficial insect control. (Texas A&M AgriLife Communications photo by Kay Ledbetter)

“Our best recommendation is to plant early,” Bynum said. “Use insecticide seed treatments on all sorghum, regardless of planting date. And then be ready to treat if needed.”

He said there are some commercial hybrids that have shown to be less susceptible to the sugarcane aphid than other hybrids, but this level of resistance may not prevent aphids from causing yield losses.

So producers need to monitor and treat just like susceptible hybrids. However, Bynum said if the resistant or tolerant hybrid is a good yielding hybrid and fits in the farming operations, then it could provide enough protection to prevent significant yield loss and reduce the number of insecticide applications compared to a susceptible hybrid.

“We have not been able to evaluate the tolerant or resistant hybrids being sold to know just what level of protection they provide,” he said. “So, contact your seed dealer to find out which of these hybrids they recommend for the highest yield potential.”

The revised threshold for the Texas High Plains is to treat when: 20 percent of plants have aphids in the pre-boot stage; 20 percent of the plants have no more than 50 aphids in the boot stage; and 30 percent in the flowering, soft dough and dough stages, Bynum said.

“Look for small colonies and patches of honeydew,” he said. “It’s a numbers game. If you have five aphids one day, by the time you can schedule a sprayer in a week, you have 250. Act quickly.”

Producers should check for reinfestation after four to seven days, Bynum said.

“If you only kill 90 percent with the first treatment, they will start building back up on you quickly,” he said. “We recommend you scout at least two times per week because of how fast they can build back up.”

“At black layer, you don’t want them moving into the head and causing honeydew and harvest problems,” Bynum said.

Currently Sivanto is the only effective labeled insecticide that is safe for beneficial insects, he said. The label for Transform, also effective, was cancelled by the Environmental Protection Agency. The Texas Department of Agriculture has submitted a request to get a Section 18 for its use in treating sugarcane aphid and provide producers with another option.

Predator and parasite numbers may not be able to initially prevent damaging sugarcane aphid buildup, but they could prevent the need for a second application, Bynum said.

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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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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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