Cooperative Extension San Joaquin County
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Hedgerows enhance beneficial insects on farms in California’s Central Valley

Hedgerow plants form a border around crop fields.
Hedgerows are rows of trees, shrubs, forbs and grasses that surround farm fields. They may be remnants of existing vegetation from cleared lands, a result of natural plant dispersal, or established via direct plantings.

They’ve been in existence for thousands of years with many benefits including serving as wind breaks, helping to reduce soil erosion, and providing habitat for wildlife. All of this helps protect our water and air quality as well as enhances biodiversity.

More recently, studies have shown that hedgerows of California native flowering shrubs planted on field crop edges can enhance beneficial insect activity on farms, possibly leading to biological pest control in adjacent crops. This valuable ecosystem service could lead to reduced insecticide use on farms, possibly enhancing environmental and worker health and safety issues and provide cost savings to growers. for thousands of years with many benefits including serving as wind breaks, helping to reduce soil erosion and providing habitat for wildlife. All of this helps protect our water and air quality as well as enhance biodiversity.

The larvae of this adult syrphid fly, also called hoverfly, will feed on aphids.
In a study published in the 2011 October-December edition of California Agriculture by Morandin et al., plantings of elderberry, toyon, coffeeberry, coyote brush, California buckwheat and California lilac on field crop edges attracted significant numbers of beneficial insects. Lacewings, ladybugs, parasitic wasps and syrphid flies, all important natural enemies of crop pests, appeared. Most beneficial insects were found on the plants during bloom, with the floral resources providing many adults the needed nectar and pollen to help them survive and reproduce. Although some pests were found in the hedgerows, nearly 80 percent of the total insects found were natural enemies.

Weedy field edges attract more pests than beneficial insects.
In contrast, an opposite trend was found for weedy field edges with more pests detected in the weeds than beneficial insects. In particular, weeds such as mustard, malva and wild radish are hosts to pests such as cucumber beetles, flea beetles, lygus and stinkbugs that can cause significant crop losses. Replacing this weedy vegetation with managed vegetation such as California flowering shrubs and native perennial bunch grasses will help rid farms of hosts that enhance pest numbers while at the same time increase beneficial insect activity.

The extent to which enhanced pest control occurs in adjacent crops is still under investigation. However, research to date shows that hedgerows aren’t concentrating beneficial insects; instead they’re actually exporting them into adjacent crops. That is, higher numbers of beneficial insects have been found in crops adjacent to hedgerows of flowering shrubs than weedy field edges. Data are still being collected on impacts to pest control.

Stinkbugs are among the insects that damage crops.

The enhanced biodiversity and potential ecosystem service benefits of hedgerows have prompted the USDA Natural Resource Conservation Service to support growers in planting native shrubs and perennial grasses on their farms. In 2009, 13 miles of hedgerows were established on California farms compared to 3 miles in 2005, so interest is growing.  In particular, planting California native flowering shrubs and forbs for attracting native bee pollinators for enhanced pollination in adjacent crops is gaining significant attention.  Recently the USDA approved 90 percent cost-share programs for pollinator hedgerows.

More information on plant selection, establishment practices and costs for planting hedgerows on farms can be found in UC ANR publication number 8390, available as a PDF or e-book: Establishing hedgerows on farms in California.

Posted on Wednesday, November 23, 2011 at 11:43 AM

Pollute, poach, dewater: Legacies of illicit cannabis grows

While the legality of California’s medical marijuana dispensaries is being debated in courtrooms, a UC Cooperative Extension forestry and wildlands ecology advisor says there are a number of issues related to the unregulated land-use practices of illicit cannabis growing that have not been addressed.

Greg Giusti
“As a forest ecologist, I spend a lot of time outdoors, and I talk to thousands of people every year about forest-related subject matter,” says Greg Giusti. “And you can’t talk to anybody today on the North Coast without the topic of cannabis growing and cannabis impacts on land coming up.”

In Lake and Mendocino counties, Giusti performs research and shares information with public agencies and private landowners in relation to forest management and freshwater ecology on behalf of UC Cooperative Extension. Marijuana farming is not a topic that Giusti ever intended to address.

Illegal water diversion is common among many illicit cannabis plots in wildlands. (Photo from Giusti's presentation, courtesy of Lake County Sheriff's Office)

Effects on natural resources
Most of the data available about illicit cannabis grows is based on drug enforcement actions, specifically how many sites were busted and how many plants or pounds of plant material were seized. Giusti has gathered photographs and anecdotal evidence of the effects on natural resources of commercial-scale marijuana grows operated illicitly on public and private lands.

Some of the effects he has documented:

  • illegal water controls (including dams, stream diversion and water storage)
  • water pollution from petroleum, pesticide and fertilizer products
  • pesticides applied without permits
  • pesticides, fertilizers and other chemicals left behind
  • indiscriminate fish and wildlife killing (including poisoning, trapping and poaching for food)
  • human trash and waste left after camping

“It’s not this green industry that people talk about,” Giusti says. “They’re diverting water, they’re polluting streams, and there’s a portion who are poaching. We’re also seeing all of the negative effects of unregulated road building, unregulated construction and unregulated human inhabitation for months and months out in the woods.”

Giusti explained that some cannabis growers divert water from streams to store in large water bladders, prematurely lowering stream levels during critical times in the year.

“It's illegal to do, but at the same time you can drive up and down Highway 101 and easily buy these huge bladders,” he said.

He notes that local businesses are selling compost by the ton, rodenticide by the pallet, thousands of pairs of clippers and turkey bags in lots of 100.

“Mainstream businesses are supporting this underground industry,” Giusti said. “You don’t have to be growing cannabis to be making money off of it.”

Raising awareness
In 2010, Giusti organized two community workshops in Lake County to address the impacts of illicit cannabis land-use on forest resources, for a combined attendance of nearly 400 community members. Giusti has shared his results with the board of supervisors for Lake and Mendocino counties, local news media, local foresters and the staff of the North Coast Regional Water Quality Control Board.

“My intention was to initiate a communitywide discussion to ask, ‘Is this what you want to happen to your forests?’” Giusti said. “Up until now it's been talked about in hushed tones, and I wanted to initiate a dialogue out loud. Everybody has been whispering about it.”

The presentation he developed for those meetings continues to generate discussion. Most recently, he has presented to the North Coast Water Quality Control Board staff and other agencies. He has shared photos collected for his presentation with Congressman Mike Thompson’s office as well.

“With the water quality control board, I had the opportunity to engage people whose job it is to protect the beneficial uses of water — and hopefully stimulate an internal dialogue so that they can continue the discussion after I leave their office,” he said. “There are other resource agencies that need to be involved, and county planning departments too. This is an unregulated land-use practice.”

This month, the Lake County Record-Bee ran an article by reporter Linda Williams with the headline “Thirsty marijuana grows suck Eel River dry,” which included some information presented at Giusti’s meetings.

“My efforts seem to be improving people's awareness,” he says. “The very thing I wanted to accomplish — creating broader dialogues — is happening.”

Posted on Wednesday, November 16, 2011 at 12:37 PM
Tags: forest (12), Greg Giusti (6), land use (4), marijuana (5), natural resources (3), pollution (1), water (19)

Time to plan your yellow starthistle weed attack

Weeds, weeds, weeds!  Have you noticed?  This has been a banner year for weeds.  Puncturevine where I’ve never seen it before. Garden soil covered with common purslane (at least it’s good in salads). And solid stands of yellow starthistle everywhere!

Mature yellow starthistle, Centaurea solstitialis
Our cool late spring and repeated late rains created multiple germination periods; weed seeds in the soil had many opportunities to sprout. And sprout they did! With the heat of summer, weeds flowered and became noticeable. Now, weeds have set seed and dried along roadsides, in fields, and landscapes. All those weed seeds will require diligent effort next spring! It’s time to plan your weed attack to prevent next year’s seedlings.

What can be done? First of all, identify your weeds. Different weeds require different treatments. Is it an annual or perennial? Does it propagate by wind-blown seeds or by runners? The University of California Integrated Pest Management website, has weed-identification guides that are fun and easy to use. The website also offers treatment guidelines.

In the California foothills, yellow starthistle (YST) is perhaps the most common weed of concern. It impacts much of our open space - agricultural and rangeland - and intrudes into our neighborhood landscapes. Yellow starthistle currently infests more than 15 million acres of land in California. Not only does it prevent recreational use, like walking or hiking, but it chokes out native grasses and wildflowers. It is also poisonous to horses, causing a neurological disorder called "chewing disease” which can be fatal once symptoms develop.

More and more, individual homeowners are becoming the key to containing and eliminating this invasive plant, wherever it exists.  The goal in treating yellow starthistle is to prevent seed formation.  Unfortunately, this year's YST has already bloomed, set seed, and dried. Planning is essential to prevent another banner crop next year.

That said, yellow starthistle can be hand-pulled at any time in its lifespan. In its present dry and spiny stage, pulling the weeds can inflict pain, so be sure to wear gloves. Double-bag the plants and burn them later in the fall.

There is a fairly new herbicide (2009) on the market from Monterey Chemical called Star Thistle Killer.

Star Thistle Killer Half Pint Bottle
It is available at home centers and nurseries and can be purchased without a permit. The active ingredient, clopyralid, is the same active ingredient in Transline and should not be used on lawns. However, one spray application on small parcels of less than two acres during the late fall, winter, or early spring rainy season will be effective in preventing yellow starthistle seedling germination next spring.

Local pest control companies are also available to provide a one-time herbicide application for yellow starthistle.  For more information, go to the Central Sierra Cooperative Extension website or call the Yellow Starthistle Leading Edge Project in the UC Cooperative Extension office at (530) 621-5533 or (209) 533-6993.

Information adapted from the University of California Integrated Pest Management Program and from “Yellow Starthistle: Brief Homeowner Information Sheet” by John E. Otto, Amador County Master Gardener.

Also see the following video on yellow starthistle control.


Posted on Wednesday, November 9, 2011 at 8:33 AM

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.

Attached Files
Groundlevel640
Posted on Thursday, November 3, 2011 at 8:47 AM

Diverse groups work together to enhance ecosystem services

Organizers were impressed with the large and diverse group of people who gathered for the “Managing Rangeland for Ecosystem Services Workshop. Photo by Leonard Jolley

Ecosystem services is a new term I've been hearing. Naturally I wondered, what are these services and is the ecosystem serving me? Ecosystem services are benefits we receive from the environment, such as clean water, open space, beautiful scenery, food production, wildlife habitat and diversity of plants and animals.

Not surprisingly, ecosystem services appeal to a broad audience. However, in the past, many people advocated for a single favored service and would fight with those who were partial to a different service. Now there is a strong trend toward partnerships.

“There’s been sea change on the topic of livestock management and rangeland ecosystem services,” said Ken Tate, UC Cooperative Extension watershed specialist based at UC Davis.

In a scenario 20 years ago, many ranchers would have focused solely on livestock production and ranch profit, while some environmental groups would have voiced concerns solely about wildlife habitat, and a government regulatory agency may have considered water quality the most important service. All parties have begun to recognize the connections among these important services and the need to work together to enhance all of them.

“If a ranch is not economically viable, then there is risk that land could become a shopping mall or some other development,” Tate explained. “A working ranch provides more ecosystem services than developments such as malls or suburban sprawl.”

A UC study published in the current issue of California Agriculture journal found that rangeland owners valued their land for its natural amenities as well as a financial investment.

Recently more than 120 people representing new and long-time ranchers, conservation groups, federal and state natural resources agencies, UC scientists and others gathered for the “Managing Rangeland for Ecosystem Services Workshop and Field Day” to discuss their common goals.

“Interest in this event reflects the growing interest in ecosystem services in a growing number of people,” said Tate, who organized the Oct. 18 event at UC’s Sierra Foothill Research and Extension Center, located 60 miles northeast of Sacramento. “Some people drove four or five hours to attend.”

At the workshop, Tate introduced the Prescribed Grazing for Ecosystem Service Project.

Ken Tate describes a project that studies managing grazing for ecosystem services on rangelands. Photo by Leonard Jolley.

Despite their different backgrounds and ecosystem service priorities, there was no adversarial discussion among the attendees, observed participant Morgan Doran, UC Cooperative Extension livestock & natural resources advisor for Solano County.

“Everyone seemed to be in agreement that livestock are a useful tool in sustaining a healthy rangeland ecosystem,” Doran said. “And all seemed to acknowledge a need to better understand the balance of provisioning goods and services from rangeland systems.”

“We used to talk about one service at a time,” Tate said. “Now we talk about tradeoffs and synergies involved in managing for many services simultaneously. Optimizing water quality might take away from profitability. Talking about tradeoffs used to be confrontational. Now if we can understand the costs of these tradeoffs, there may be an individual or organization willing to pay for that difference. Basically, purchasing ecosystem services.”

Tate credits the workshop cosponsor California Rangeland Conservation Coalition for fostering the collaborative attitude. UC is among the more than 100 agricultural organizations, environmental interest groups, and state and federal agencies that have signed the California Rangeland Resolution, which recognizes that rangelands and the diversity of species they support largely exist due to grazing and other stewardship practices of the ranchers who own and manage the land.

“New people have come to the table who might not have gotten involved in a negative process,” Tate said. “The coalition is a positive approach to the conservation of rangelands, that makes it attractive to people. They are working together to achieve common goals.”

Tate is excited about Cooperative Extension’s role of trying to identify the information needs and conducting the research to supply this information.

Leslie Roche, a UC Davis postdoctoral researcher and presenter, remarked on the interest and enthusiasm in collaborative research and management demonstrated among the diverse group of attendees.

“Everyone is genuinely motivated to work together in bridging the gap between research and management communities on this topic, and that is really exciting," Roche said.

A list of speakers and their presentations for the workshop and field day are posted on the California Rangeland Watershed Laboratory website.

Although the term ecosystem service was unfamiliar to me, it’s not new. In 2000, United Nations Secretary-General Kofi Annan called for the Millennium Ecosystem Assessment. The objective of the project was, “to assess the consequences of ecosystem change for human well-being and the scientific basis for action needed to enhance the conservation and sustainable use of those systems and their contribution to human well-being.”

Posted on Wednesday, October 26, 2011 at 3:44 PM

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