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Cooperative Extension San Joaquin County

Posts Tagged: rangeland

Ranchers concerned about invasion of medusahead weed on foothill rangeland

Fadzayi Mashiri walks through a patch of medusahead in Mariposa County.
One of the worst rangeland weeds in the West is aptly named after a monster in Greek mythology that has writhing snakes instead of hair.

Medusahead, an unwelcome transplant from Europe, is anathema to the cattle living off rangeland grass. The weed's three-inch-long bristles poke and sometimes injure the animals' mouths and eyes. The weed is also low-quality forage for livestock. When medusahead takes over rangeland, it reduces the forage value by 80 percent.

When Fadzayi Mashiri, UC Cooperative Extension advisor in Mariposa, Merced and Madera counties, was appointed in 2013, she became the first natural resources and rangeland expert to hold the position since the retirement of Wain Johnson more than a decade before. She polled local ranchers to determine their most pressing problems. They said weed management, and in particular, medusahead.

Medusahead is relatively easy to identify on the range. It has distinctive stiff awns and a seed head that does not break apart as seeds mature. Patches of medusahead are obvious when spring turns into summer.

“Medusahead stays green after most of the annual grasses have dried off,” Mashiri said.

Medusahead has high silica content, making it unpalatable to cattle. The silica also protects the plant from decomposition, so a thick thatch builds up on the rangeland, suppressing more desirable species, but not the germination of the next year's medusahead seedlings.

The awns on medusahead can irritate and injure cattle.
Over the years, UC scientists have discovered a number of medusahead control strategies:

  • Corral cows on medusahead before the plant heads out or employ sheep to graze medusahead patches. It's not sheep's favorite forage either, but they will eat if left with no other option.

  • Prescribed burning in late spring or early summer. However, this strategy poses air quality and liability issues.

  • Apply nitrogen fertilizer to medusahead to improve palatability before it flowers, which is showing promise for controlling the weed and boosting the value of infested rangeland.

  • Chemical control.

In spring 2014, Mashiri conducted a demonstration field trial in Mariposa County of medusahead control with the herbicide Milestone, which was developed by Dow AgroSciences mainly to control broadleaf weeds like yellow starthistle. The trial followed rangeland weed control research done by scientists including Joe DiTomaso, UC Cooperative Extension specialist in the Department of Plant Sciences at UC Davis. DiTamaso found that the density of medusahead in treated areas declined and concluded that Milestone prevents medusahead seedlings from thriving.

Unfortunately, Milestone treatment of large rangeland areas is expensive.

“But if the value of forage declines, the productivity of livestock is compromised,” Mashiri said. “When you look at it that way, the chemical treatment might be useful.”

Posted on Thursday, June 5, 2014 at 8:58 AM

Yosemite toad undeterred by cows grazing in meadows

Yosemite toads start out smaller than your pinky nail and can grow to almost as large as your fist. Photo by R. Grasso
If you’re trying to save Yosemite toads, keeping large animals with hooves such as cows away from the small squishable amphibians would seem like a good start. University of California scientists conducted research to confirm such suspicions. Their research revealed that fencing off grazing cattle didn’t benefit the Yosemite toad, but increased meadow wetness did.

Amphibians are in decline globally. The Yosemite toad was once prevalent in the high Sierra including Yosemite National Park, where it was first discovered and after which it is named. Since the early 1980s, the amphibian’s population and habitat have plummeted.

In the Sierra Nevada Mountains, where livestock graze among toad habitat, UC scientists erected fences to keep the cattle out of toad breeding and rearing areas and studied the effects on Yosemite toad populations for five years. 

“The Yosemite toad has been proposed for listing under the Endangered Species Act,” said Ken Tate, UC Cooperative Extension specialist in the Department of Plant Sciences at UC Davis and a principal investigator for the study. “One of the potential factors proposed to be driving the species decline is cattle grazing. However, our research does not support this.”

The researchers found that meadow wetness played a greater role in Yosemite toad presence.

"The toads use wetter areas and the cattle use drier meadow areas, which provide better forage,” Tate said.

“Determining the Effects of Cattle Grazing Treatments on Yosemite Toads (Anaxyrus [=Bufo] canorus) in Montane Meadows” was published in the November 2013 issue of PLOS One http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0079263.  Tate’s coauthors on the study are Susan K. McIlroy, research scientist with U.S. Geological Survey in Boise, Idaho;  Amy J. Lind, research wildlife biologist with the U.S. Forest Service Pacific Southwest Research Station; Barbara H. Allen-Diaz, professor in the Department of Environmental Science, Policy and Management at UC Berkeley; Leslie M. Roche, postdoctoral researcher in the Department of Plant Sciences at UC Davis; William E. Frost, UC Cooperative Extension advisor; and Rob L. Grasso, fishery and aquatic ecologist with U.S. Forest Service Eldorado National Forest.

This is the latest of three articles examining the relationship between cattle grazing and growth in numbers of Yosemite toads. In April 2012, PLOS One published “Cattle Grazing and Conservation of a Meadow-Dependent Amphibian Species in the Sierra Nevada,” online at http://www.plosone.org/article/info%3Adoi/10.1371/journal.pone.0035734. The first article “Cattle Grazing, Mountain Meadows, and Sensitive Species,” written in 2011, is online at http://rangelandwatersheds.ucdavis.edu/main/projects.htm.

Researchers found that Yosemite toads prefer the wetter parts of Sierra meadows while cows graze the drier areas.
Posted on Friday, December 20, 2013 at 12:50 PM
Tags: grazing (2), rangeland (6), Yosemite toad (1)

UC Davis to host Rangeland Conservation Summit

In Modoc County, cattle share rangeland with wildlife.
Ranchers, environmentalists, researchers, and regulators will meet at UC Davis January 19-20 for the Range Research Symposium and California Rangeland Conservation Coalition Summit to explore new research and share varied interests and their common commitment to preserving California’s rangeland.

“We’ll be looking at the latest rangeland science, practices, and collaborations that support the many public benefits we receive from rangelands,” said UC Cooperative Extension Watershed Specialist Ken Tate with the UC Davis Department of Plant Sciences, a key organizer of the event.  “Participants will see why diverse interests have agreed on the importance of working rangelands and the need to preserve this way of life for the benefit of future generations of all Californians.”

The two-day gathering at Freeborn Hall will feature two events in one – the first Range Research Symposium and the 7th annual California Rangeland Conservation Coalition Summit. The first day will highlight rangeland research from throughout California. The second day will include ranchers sharing their conservation stories and successful collaborative conservation initiatives, research presentations, and plenty of networking opportunities.

The full agenda and registration information is available here. Student discounts are available.

Posted on Wednesday, January 4, 2012 at 6:17 AM
Tags: conservation (1), Ken Tate (2), rangeland (6)

Building a better water trough

UC Cooperative Extension rangeland farm advisor Royce Larsen, left, discusses the ground-level water trough with inventor George Work.
“Water is the driver of nature.” - Leonardo da Vinci

California’s vast dry rangelands are dotted with water troughs ideal for quenching cattle’s thirst. But in most cases, the troughs’ designs are a torment to wildlife drawn for a drink.

Monterey County rancher George Work observed how traditional water troughs frustrated the wildlife on his family’s 12,000-acre cattle ranch. Small birds couldn’t reach water two or three inches below the top edge. Coyotes, bobcats and cottontails weren’t tall enough to reach over the rim. Work set to making a water trough that would meet the needs of all animals on the range – from cattle, hunting dogs and horses to deer and rabbits.

While raising cattle remains the primary function of the Work Ranch, in order to generate more income from the scenic open space the ranch opens its doors to hunting wild boar, quail and Tule elk. The visitors enjoy seeing a diversity of wildlife.

“One-third of our business comes from wildlife,” Work said.

In 1998, Work drew from decades of first-hand experience to design a better water trough. With a grant from USDA’s Natural Resources Conservation Service, he constructed a prototype. The concrete trough is sunk into the ground under an elderberry tree. Work modified a float like those used in toilet tanks to keep the water within centimeters of the rim.

That first man-made watering hole was an improvement for many species, but it also revealed some problems. Birds needed an escape ramp to climb out of the water should they fall in while drinking; the ramp should be shallow enough to allow the birds to bathe. Larger animals had to be kept from using the trough for a cooling dip. Work found that sloping the sides to a sharp V at the bottom of the trough made it unappealing for a soak.

Years of experimentation and innovation resulted in the development of pre-manufactured concrete water troughs, which are now commercially available. The next challenge is selling the idea to ranchers.

Enter UC Cooperative Extension. On an unrelated visit to the Work Ranch, UC Berkeley wildlife biologist Reg Barrett was impressed by Work’s invention and encouraged UC Cooperative Extension rangeland advisor Royce Larsen and NRCS rangeland conservationist Karl Striby to help spread the word.

Larsen and Stirby are now completing the first step, adding the ground-level water trough specifications to NRCS's published Technical Notes. The publication will provide ranchers and other land owners with the information they need to install the wildlife-friendly troughs.

“If you’re thinking of installing a basic, traditional trough for cattle, it may or may not be the best idea,” Larsen said. “But you’re thinking about supporting both cattle and wildlife, it’s great.”

 


 

In the video below, rancher George Work shows the ground-level water trough prototype and the second-generation, pre-manufactured version.


Posted on Thursday, November 3, 2011 at 8:47 AM

Loss of Williamson Act would threaten wildlife habitat

California’s premier farmland protection tool – the Williamson Act – is on the state’s budget-cutting chopping block and with it critical habitat needed for conservation.

A UC Davis study completed by a team of graduate students working with rangeland watershed specialist Ken Tate and other faculty found that 43 percent of the 10 million acres of “non-prime” land in the program, used primarily for cattle grazing, is also critical for statewide conservation goals. Conservation status was determined by the California Rangeland Conservation Coalition, a voluntary partnership between ranchers, environmentalists, government agencies, and others working to preserve and enhance the state’s rangeland areas.

For nearly 50 years the Williamson Act has provided private landowners with tax breaks in exchange for an agreement to keep land in agricultural or open space use for a specified period of time. The state compensated counties for the reduced property tax revenue but cut these subsidies in 2008 and again in 2009. Legislation passed in October (Assembly Bill 2530) allows counties to voluntarily implement modified contracts for reduced terms but does not ensure continuation of the Williamson Act beyond 2015.

To understand how loss of the Williamson Act would affect ranchers and the environment, the researchers surveyed 700 members of the California Cattlemen’s Association in 2010. Their findings confirmed what many in the industry already know: ranching is a low-profit industry. Seventy percent of surveyed ranchers made less than $10,000 in 2009 and less than half reported making a profit. Seventy-two percent of the ranchers surveyed consider the Williamson Act to be “extremely important” to their operations.

Survey results also show that loss of Williamson Act funding at the state level would put critical habitat at risk for development. Forty-two percent of the surveyed ranchers said they would sell some or all of their rangeland without the tax relief. Fifty-six percent of the ranchers predict their sold land would be developed for non-agricultural uses.

“California’s rangelands provide clean drinking water, wildlife habitat, open space, and sequester carbon among many other critical ecosystem services,” Tate says. “We need tools such as the Williamson Act to conserve this important landscape.”

Study authors include doctoral students Sarah Myhre, Iara Lacher, Will Wetzel, Dale Manning, and Dan Swezey. They were participating in a collaborative project for an “IGERT” traineeship focused on rapid environmental change. The program is funded by the National Science Foundation. A concise policy brief on the survey was published in October 2010 and includes an illustrated map of the areas that could be affected by the demise of the Williamson Act. The policy brief and additional information about the program is available online at http://reach.ucdavis.edu/programs/williamsonact.html.

Posted on Monday, March 7, 2011 at 10:14 AM
Tags: Ken Tate (2), rangeland (6), wildlife (2), Williamson Act (1)

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