Livestock Economics for Western Producers

Livestock Economics: What Attributes Bring Higher Prices?

By Laurie Greene, Editor

At the 100th Annual California Cattlemen’s Association (CCA) & California CattleWomen’s (CCW) Convention last week in Sparks, Nevada, Tina Saitone, cooperative extension specialist, UC Davis Department of Agricultural and Resource Economics, described her research on rangeland and livestock economics. “Primarily, my focus has been on cattle — beef cattle to date — but I’ve also started some projects recently with sheep producers and the predator interactions they have specifically with coyotes. I am examining whether or not [producers] can use nonlethal depredation methods to mitigate those losses.”

“Right now, I have been concentrating on marketing characteristics of cattle,” she said. “I study those practices employed by producers, such as when they wean their cattle; how many vaccinations they have; whether they market [their cattle] as natural, grass-fed, or organic; and the impact that [these choices] have on their prices.”

Tina Saitone, cooperative extension specialist, UC Davis Department of Agricultural and Resource Economics

Interestingly, Saitone and her colleagues have mainly been using satellite video auction data. “Western Video Market Auction actually held their auction this month here in Sparks, Nevada because they can do it at different locations all the time. So, we use that data to figure out cattle characteristics and then determine the marginal impact that each of those characteristics has on price,” said Saitone.

Characteristics such breed, frame score, flesh score, and weight, are definitely controls in Saitone’s research model because those are main drivers of price. “But what we want to do is figure out — holding all those things constant —if a producer raises their cattle natural, what kind of premium does that bring them? We’re really looking for that incremental difference.”

One might expect certain factors such as natural or organic, to deserve a higher price, but there always has to be a buyer. “Right now, when prices are low relative to 2014 and early 2015, ranchers do have some opportunities to get some higher prices in what we would call niche markets. Consumers are increasingly demanding a wider range of characteristics. They want grass-fed. They want organic. They want natural, no hormones. All of these are what we would call credence attributes. If you go to the grocery store and you taste a steak, you probably don’t know if it was raised natural.”

Accordingly, the industry has third-party certification to assure consumers that when they pay a higher price for that product they are actually getting those traits. “Farmers actually have the ability to fill some of those niche markets that consumers have created with their demand and possibly get higher prices than just selling into traditional commercial channels.”

The data that Saitone has been looking at from Western Video is focused on Western states, including California. Certainly, location places Western producers at a persistent disadvantage because the majority of the processing capacity is in the central part of the country, with Nebraska being the hub. Saitone said, “When you think about cattle being raised in California having to be transported all the way to Nebraska, some 1600 or 1700 miles, not only do you have the cost associated with that transportation, but you also have shrink; you have mortality.

California Cattlemen’s Association (CCA)

California CattleWomen

UC Davis Department of Agricultural and Resource Economics

California Ag Today2021-05-12T11:17:11-07:00December 6th, 2016|

Initial Walnut Irrigation Can be Delayed

Walnut Irrigation Research Update

By Brian German, Associate Broadcaster

First springtime walnut irrigation can be delayed, according to a UC Cooperative Extension team in Tehama County working on some fascinating research regarding irrigation practices. Allan Fulton is an Irrigation and Water Resource Advisor who covers Tehama, Colusa, Shasta and Glenn counties. “We actually just finished one of our irrigation experiment harvests this weekend. It was looking at early season water management decisions, basically deciding when to begin the irrigation season,” Fulton said.

Allan Fulton, UC Cooperative Extension Irrigation Specialist

Growers typically begin irrigating their walnuts sometime between late April and early May. In order to be as thorough as possible in their experiment, Fulton and his team have been pushing the limits beyond what most growers would ever consider. “We had some treatments that got no irrigation until almost the end of June,” Fulton explained.

Now in its third year, the research experiment is generating information that will provide a variety of benefits. “The whole motivation is to avoid possible injury to the trees from irrigating too much, too early, from lack of aeration and damage to the root system,” Fulton said. Delayed irrigation, while having no impact on yield or nut size, can also provide a bit of water savings. “We’re trying to look for the sweet spot,” with less intensive early season irrigation in favor of root health, tree health and disease prevention.

The research is being conducted in the northern Sacramento Valley primarily using the Chandler variety of walnut trees. Fulton has spent some time working in the San Joaquin Valley as well and understands different weather conditions can be a significant factor when applying their findings to other regions. “Our spring rainfall is quite a bit different than other walnut growing areas. Usually we’ve got an added source of water that sometimes you might not have in the southern San Joaquin Valley,” Fulton noted. From his experience, he suggested growers could usually wait until “the first week of May in most years, before really getting pressed for irrigation.”

The location of the research exposes groves to the opportunity to receive “more rain during the dormant season with a better chance at a deeper profile in moisture before you ever break dormancy,” Fulton said. More regional rainfall is possible in the spring as well, while the trees are growing.

The information gathered so far indicates growers should not jump the gun on springtime irrigation, particularly if there is still any kind of standing water issues. “The data is starting to suggest that you’ve got some room. You don’t have to irrigate at the first sign of heat; you can use a little bit of the stored moisture coming out of winter,” Fulton said. He also noted “It’s a lot more difficult to recover from a damaged tree with a sick roots system,” than it is to recover from a lack of early season irrigation.

California Ag Today2021-05-12T11:05:46-07:00October 11th, 2016|

ACP Spread in Bakersfield Area, Ingenious Research Proceeds

Ingenious Research Effort to Fight ACP Spread with Natural Predators

By Joanne Lui, Associate Editor

Beth Grafton-Cardwell, Cooperative Extension specialist, University of California, Riverside Department of Entomology

As we have reported in-depth before on California Ag Today, the Asian Citrus Psyllid (ACP) is a tiny, mottled brown insect that poses an ever-increasing threat to the state’s robust citrus industry, as well as to residential citrus trees. The pest can spread a bacterium known as Huanglongbing (HLP) that is fatal to citrus trees. The disease has nearly shut down Florida’s citrus industry.

Beth Grafton-Cardwell, cooperative extension specialist in integrated pest management, UC Riverside Department of Entomology, explained the significance of the recent ACP spread to Bakersfield. “That is really problematic because it’s mostly in the urban areas. It’s very difficult to find, to control and to stop that spread. It’s going to move out from that region into the local citrus orchards, and so there are lots of meetings and discussions right now to mobilize growers to get treatments to help protect their citrus orchards against the psyllid.”

#CitrusMatters

To contain the ACP problem, Grafton-Cardwell stated, “There are traps everywhere, but the traps are not terribly efficient. So, we really need to carefully examine groves and flush [new leaf growth] for the nymph form,” she said.

According to Agriculture and Natural Resources, University of California’s Statewide Integrated Pest Management Program:

Adults typically live one to two months. Females lay tiny yellow-orange almond-shaped eggs in the folds of the newly developing “feather flush” leaves of citrus. Each female can lay several hundred eggs during her lifespan.

ACP (Source: ACP UC IPM)

The eggs hatch into nymphs that are wingless, flattened, yellow or orange to brownish, and 1/100 to 1/14 inch long. Nymphs molt four times, increasing in size with each nymphal stage (instar), before maturing into adult psyllids. The nymphs can feed only on soft, young leaf tissue and are found on immature leaves and stems of flush growth on citrus.

The nymphs remove sap from plant tissue when they feed and excrete a large quantity of sugary liquid (honeydew). Each nymph also produces a waxy tubule from its rear end to help clear the sugary waste product away from its body. The tubule’s shape—a curly tube with a bulb at the end—is unique to the Asian citrus psyllid and can be used to identify the insect.

Grafton-Cardwell and other experts are concerned because once the ACP becomes established in urban areas, it is difficult to eradicate. “It starts spreading into the commercial citrus, and we’re off and running,” she commented.

In a ingenious effort to control the spread of the psyllid, trained teams of entomologists have imported Tamarixia radiata, a tiny wasp that naturally preys on ACP, from Pakistan to research and release in California. A cooperative effort of the University of California Riverside, Citrus Research Board, United States Department of Agriculture and California Department of Food and Agriculture, researchers are also exploring the effectiveness of another beneficial insect called Diaphorencyrtus aligarhensis to assist Tamarixia with control of the Asian citrus psyllid. To see where Tamarixia and Diaphorencyrtus have been released, visit this University of California’s website map at, “Distribution of ACP, HLB and Parasites in California,” and turn on the parasite layers.
Grafton-Cardwell said, “They’re going to inundate that area,” with natural ACP predators, “so hopefully that will push back a little bit.”

California Ag Today2021-05-12T11:05:46-07:00October 10th, 2016|

Food Tank’s Farm Tank Summit in Sacramento Reveals Knowledge Gap

Food Tank’s 1st Annual Farm Tank Summit in Sacramento Reveals Gap in Agricultural Knowledge

Good Starting Point for Constructive Conversation

By Patrick Cavanaugh, Farm News Director

Several hundred food activists attended the First Annual Farm Tank Summit in Sacramento last week, hosted by Food Tank, in partnership with the Visit Sacramento, California Farm-to-Fork Program, and University of California, Davis. Danielle Nierenberg, co-founder and president of Food Tank noted having the event in Sacramento enabled West Coast agricultural experts to contribute to the discussion.

“We were really excited to feature California agriculture, because it’s such a huge part of the American economy,” said Nierenberg. “Californians are feeding the world, and we need to really highlight what these amazing producers are doing. When the Farm to Fork program of the Visitors Bureau reached out to us, we were thrilled to partner with such an amazing group of people, as well as UC Davis folks and the Center for Land-Based Learning,” she said.

Food Tank, an abbreviation of Food Think Tank, is a 501(c)3 non profit organization focused on building a global community for safe, healthy, nourished eaters that values education, inspiration and change.

According to their website:

Food Tank is for the 7 billion people who have to eat every day. We will offer solutions and environmentally sustainable ways of alleviating hunger, obesity, and poverty by creating a network of connections and information for all of us to consume and share. Food Tank is for farmers and producers, policy makers and government leaders, researchers and scientists, academics and journalists, and the funding and donor communities to collaborate on providing sustainable solutions for our most pressing environmental and social problems.

The organization begins with the premise, “Our food system is broken. Some people don’t have enough food, while others are eating too much. There’s only one way to fix this problem—and it starts with you and me.”

With the goal of feeding the hungry world of nine billion people in a few years, “Food Tank highlights hope and success in agriculture. We feature innovative ideas that are already working on the ground, in cities, in kitchens, in fields and in laboratories. These innovations need more attention, more research, and ultimately more funding to be replicated and scaled-up. And that is where we need you. We all need to work together to find solutions that nourish ourselves and protect the planet.”

Nierenberg clarified, “I don’t necessarily think we need to scale up food production; I think we need to scale out different innovations that are working. We’re wasting about 1.3 billion tons of food annually. That’s enough to feed everyone who’s hungry today, so we don’t necessarily need to ramp up production. We need to have better distribution, and processing practices that can help get food to people who need it the most,” she said.

“We need the political will behind those things,” she continued, “to build the infrastructure necessary for farmers to have better processing facilities, to have better storage facilities, to have better roads—if we’re talking about the developing world. I don’t necessarily think that we need to invest in producing more calories; we need better calories. We need more nutrient-dense food, and we need less starchy staple crops,” she noted.

Editor’s Note: Activists overtook the stage during the event, and the conversation was notably challenging for panelists. In an effort to Cultivate Common Ground to link consumers with the farmers who grow their nutritious food—and vice versa—California Ag Today has chosen to share some interesting statements from presenters and attendees to illustrate, perhaps, where the discussion could begin:

Regarding farms and processing facilities, big is bad, and small is good.

Regarding food quality, organic produce is healthy and safe, while conventional produce is unsafe and full of pesticides.

One of many moderators from the Bay Area, Twilight Greenaway, managing editor of Civil Eats mistakenly introduced Oscar Villegas, Yolo County Supervisor, District 1, as being from Sacramento County. When Villegas corrected her, Greenaway said, “I’m showing my Central Valley and Bay Area eliteness.”

Eric Holt-Giménez, executive director of Food First, noted that farmworkers are invisible in California agriculture. “There is racism in the fields. We need more worker unions and we need farmworkers to be paid much more than they are now and the farmworkers should be getting pensions from the farmer.”

Michael Dimock, president, Roots of Change, said to the audience, “You guys are doing a great job. Keep doing it. Keep working with your NGOs. They know policy. In turn, they can work with the legislators.”

“You need to be in the capital, pursuading the legislatures to support their bills. They want to be reelected, and if they don’t do what we ask them to do, they are scared.”

“In the meantime, we have to be nice to farmers because farmers are scared. We are putting a lot of pressure on them; They are in a vice. Our movement has supported bills AB 1066 – the overtime bill, minimum wage increases, organic farming legislation, and workers’ rights.”

Kerryn Gerety, founder and CEO, Lazoka, referred to John Purcell, vegetables global R&D Lead, Hawaii business lead, vice president and distinguished fellow, Monsanto Company, and said, “There is an elephant in the room, the Monsanto rep. Monsanto has all the technology patents. We all want transparency and we need you to be more transparent.”

Continuing, “Why doesn’t Monsanto open-source some of your patents and release the intellectual property so others can take advantage of your teçhnology?”

Purcell answered, “We are an Ag company. Why would our company invest a million dollars on technology and let everyone have it? It is our investment and we need to have the opportunity for a return on that investment.

During a panel discussion of food companies including Blue Apron, Almond Board of California, and Bayer CropScience, that covered organics, Jennifer Maloney, food chain sustainability manager, Bayer CropScience, said, “We do support the organic industry, because we have biological products that work in organic as well as conventional [farming].”

Maloney also talked about agricultural Integrated Pest Management (IPM) technology such as smart sprayers that spray only targeted areas.

Matt Wadiak, founder & COO, Blue Apron, responded, “It’s not about smart sprayers; it’s about biological systems in the field and trying to lean on them instead of spraying.”

Maloney replied, “Yes, that is exactly what IPM is.”

Keith Knopf, COO, Raley’s Family of Fine Stores, commented on the organic question, “the way we see organic versus inorganic—that is not the discussion for us. What’s more important to us is, is it the candy bar or the apple?”

This two-day event featured more than 35 speakers from the food and agriculture field, interactive panels moderated by top food journalists, networking, and delicious food, followed by a day of hands-on activities and opportunities for attendees. This was the second in a series of three 2016 Summits, following the Washington, D.C. Food Tank Summit that completely sold out and drew in more than 30,100 livestream viewers. The third Summit will be held in Chicago on November 16, 2016.

California Ag Today2021-05-12T11:05:46-07:00September 27th, 2016|

Spider Mites Gave Almond Industry Reprieve in 2016

Spider Mites Showed up Late This Season

By Lauren Dutra, Associate Editor

This year, near-perennial spider mite pressure on almonds was delayed until hull-split. “That’s the big story this year,” said David Haviland, UC Cooperative Extension entomology farm advisor, Kern County. “The orchards of people who did early management programs well their fields looked great until hull-split. And the orchards of people who did not do anything well their fields looked great at hull-split as well—when the mites showed up,” he said.

Almond hull-split

“And a good population of them arrived,” Haviland continued. “People sprayed, but now we’re at the beginning of September, and everyone I have talked to in the Southern San Joaquin Valley have reported the arrival of the sixspotted thrip, a beneficial spider mite predator. The thrips came in fierce, cleaning out anything that didn’t get controlled prior to Nonpareil harvest,” said Haviland.

“We are on the tail end of the season in Kern County, and mites ought to be going away in a couple of weeks,” he said.

Haviland also explained the appearance of navel orangeworm this year is about average. “As far as navel orangeworm goes, things are looking good. They are certainly out there. They’re certainly in some nuts, but trap captures have been about normal, so—nothing really alarming in terms of numbers,” Haviland noted. “I haven’t heard of anybody really getting hit hard this year, other than some orchard edges here and there.”

“Growers seem to be happy. We are about halfway through the harvest, hoping the second half of almond-shaking goes just as well as the first,” said Haviland.

California Ag Today2021-05-12T11:02:58-07:00September 9th, 2016|

Weedy Rice Challenges Some Rice Growers

Weedy Rice Crops Ups Again in Northern Calif. Rice Fields

By Patrick Cavanaugh, Farm News Director

In Northern California, rice growers typically prepare to start harvesting in mid-September, but some growers have endured a lot of weed pressure from weedy rice (Oryza), also known as red rice, according to Whitney Brim-DeForest, a UC Cooperative Extension Rice Farm Advisor in Sutter, Yuba, Placer, and Sacramento Counties who focuses particularly on weeds. Red rice is actually the same species as cultivated rice, but it produces far fewer grains per plant and is therefore considered a pest.

Brim-DeForest said weedy rice is common in the Southeast, but not in California. “We’ve been pretty lucky in California in that we actually don’t have a big problem with it,” she said. “It’s a big problem down in the southern U.S. and they have been dealing with it in for a long time; but we have had it crop up. I think the last time was in 2006, and we managed to deal with it. It somehow popped up again in the last couple of years, so we’re dealing with it again.”

How weedy rice reached California is apparently a mystery. “We don’t really know the source of it, to be honest,” said Brim-DeForest. “We’re investigating that through research, hopefully starting this fall,” she said.

Brim-DeForest said growers have few choices to control weedy rice. “Growers that have it will either have to rogue¹ it out, pull it out by hand or sacrifice that field and spray it with Roundup,” she said, “which would kill the rice as well. And, if the rice grower doesn’t know he has weedy rice in the field, it could hurt him later at the rice mill,” explained Brim-DeForest.

“Once harvested, the rice goes to the mill. If a certain amount of red rice bran (the outer layer surrounding the rice grain) is discovered, the mill will not accept it and could reject the entire load,” she said.

¹rogue (verb) to remove inferior or unwanted plants

California Ag Today2021-05-12T11:05:48-07:00September 2nd, 2016|

Vigilant Seed Bank Reduction for Weed Control

Vigilant Seed Bank Reduction: Whatever it takes, don’t let weeds set seed.

By Patrick Cavanaugh, Farm News Director

For the past 15 years, Robert Norris, professor emeritus and vegetable crops weed specialist, UC Davis Department of Plant Sciences, has continued to attend Weed Day each year at UC Davis and to contribute weed photography for CalPhotos, a UC Berkeley Digital Library Project photo database of world-wide plants, animals, landscapes, and other natural history subjects developed to provide a testbed of digital images for computer science researchers to study digital image retrieval techniques. Norris was involved with initiating the Plant Protection and Pest Management Graduate Program at UC Davis.

“I’ve been a botanist since I was 14 years old,” Norris said, “and I still have a lot of passion regarding weed control.” Norris has a strong and steady philosophy on weed control and it all comes down to seeds. “The last 25 years of my work, I looked at population dynamics of weeds, like seed longevity in the soil and what we call the size of the seed bank also known as the seed production by weeds. That’s really where I spent most of my time.

Field Bindweed

“I found that most people have a very poor idea of how many seeds are produced by a weed. This led me to question some of our current management philosophies; namely, the one that comes out of entomology—the use of thresholds (or how many weeds need to be present before treating them),” noted Norris. “I felt that for weed science, thresholds were not the way to go, and my position has been vindicated by the problems we’ve run into using thresholds.”

Norris offered the example, “Barnyard grasses are probably one of our most serious summer grass weeds. A small plant can produce 100,000 seeds; while a big plant, well over a million. I can remember going put in a tomato field years ago and looking at one barnyard grass plant. Because I had been working with it, I can say that plant probably put out 50,000 seeds. If you spread those seeds around an acre, that’s enough to give you serious yield loss the next year,” Norris explained. “Again, that’s one plant, spread out over an acre. Obviously its seeds wouldn’t spread over an acre [on their own], but with our tillage equipment we would move it around quite a bit.”

“My bottom line for about 30 years now is: Don’t let the weeds set seed. Whatever it takes, don’t let them set seed,” Norris said. If you follow that philosophy, Norris said after a while you drive the seed bank down.

“Many people don’t realize this, but some of our really big growers got on to it a long time ago. One farming operation I worked with for years, J. G. Boswell Co., with most of its land in Kings County. “I knew the manager in the late ’50s, into the ’70s. He now is retired now, but he came to this conclusion himself back in the late ’50s,” Norris said. “I haven’t been on Boswell’s property now for 20 years, because I retired. However, if you go down there, you will not see a weed problem, at least not like most growers.”

“The difficulty really is, in order to carry out this philosophy, you need to use hand labor for weed management and it is becoming less and less easy to find,” explained Norris. “Most weed management is done on a one-year one-crop basis; whereas, the type of management we’re talking about where we’re really thinking seed bank dynamics, has to be done over multiple years. Another big problem that I still see is if you miss one year, you can undo 5 to 10 years of what you’ve just been doing, because of this high seed output,” he said.

NEVER LET ‘EM SET SEED, by Robert Norris, Weed Science Society of America.

California Ag Today2021-05-12T11:05:50-07:00August 8th, 2016|

Mathesius is New UC Soil Scientist

Mathesius is New Agronomy Farm Advisor in Sutter-Yuba, Colusa Counties

By Patrick Cavanaugh, Farm News Director

Konrad Mathesius is the new Agronomy farm advisor at the UC Division of Agriculture and Natural Resources Cooperative Extension, Sutter-Yuba, Colusa Counties. Mathesius first explained his unusual last name. “It means ‘mathematics’ in Latin. I guess we had accountants in our family lineage back there somewhere,” he said.

Mathesius completed his undergrad degree in political science at Utah State, followed by two master’s degrees at UC Davis in Soils and Biogeochemistry; and in International Agricultural Development (IAD)—a graduate group within the Department of Plant Sciences. “The IAD is flexible in its curriculum, which allowed me to take many plant- and soil- specific courses. I took the opportunity at IAD to specialize in soils,” he said.

California Safflower Field

“Through the years, we have learned a lot through the pioneers of soil science and it’s an exciting field because there is still a lot to learn,” said Mathesius. “And everything that comes out of soil science, in one way or another, is applicable to life on the planet.”

“Soils also tell a story, and that’s one thing I really enjoy about it. It’s especially evident in California because there is a remarkable combination of parent material that has created an abundance of different soils in the state,” noted Mathesius. “And it’s very relevant to agriculture, ecology, and environmental science. Differences in soils create a stark contrast in how crops grow and how they need to be managed,” he said.

Mathesius is responsible for the agronomic crops grown in his region, including dry beans, oilseeds such as safflower and sunflower, fresh market corn and silage corn, and small grains such as barley, wheat, and rye.

“I’m a soil scientist by trade, but ultimately I am a UC Cooperative Extension Farm Advisor and available to growers to figure out what their crop issues are—which include pests, diseases and soil fertility,” noted Mathesius. “I am a resource, and the UC system has many other resources and personnel who can thoughtfully consider solutions to crop problems.”

California Ag Today2021-05-12T11:05:51-07:00July 26th, 2016|

Weed Control in Rice Fields

Controlling Herbicide-Resistant Weeds in California Rice Fields

By Emily McKay Johnson, Associate Editor

Whitney Brim-DeForest, UC ANR Cooperative Extension rice farm advisor for Sutter, Yuba, Placer and Sacramento Counties in California, currently works in all rice production areas across the state to identify problematic weeds in rice fields.

Given her background in weed science, Brim-DeForest explained California rice growers flood their fields for weed suppression, as well as use herbicides for weed control and management. “I’d say that we do have quite a few herbicides right now. As we continue to get new herbicide resistant weeds every year,” said Brim-DeForest, “we are starting to run out of options, especially for some growers who encounter herbicide resistance.”

Brim-DeForest believes herbicide resistance was first discovered in the early 1990’s, but “has become significantly problematic for growers within the last 20 years. Because of the herbicides we use and the limited number that we have, we have ended up with an increasing number of weeds that are herbicide resistant every year. Since about 2000, we’ve had a new species or herbicide that encounters resistance every year,” she stated.

Brim-DeForest treats a multitude of weed species in her line of work. “I would say the watergrass species is our biggest problem,” she noted. “We also have a weedy red rice that was discovered in the early 2000s. It is not widespread, but we do have a few fields with it,” she explained.

Featured Photo: Whitney Brim-DeForest, UC ANR Cooperative Extension rice farm advisor.

California Ag Today2021-05-12T11:03:00-07:00July 11th, 2016|

Jasieniuk on Weed Evolution

Tracking Herbicide Resistance in Weed Evolution

By Emily McKay Johnson, Associate Editor

Marie Jasieniuk, professor and weed scientist at UC Davis College of Agricultural and Environmental Sciences, discussed her groundbreaking research, “I work on the population genetics and evolution of agricultural weeds and invasive plants,” she said. “We use molecular tools to look at the origins and spread of weeds. We also use molecular tools and genetic studies to understand the evolution of herbicide resistance in weeds,” Jasieniuk added, “to be able to propose management approaches that reduce the likelihood of further evolution and spread of resistant weeds.”

UC Davis Annual Weed Day 2016

Jasieniuk and her team identify the origins of invasive plants, and determine how they were introduced. “We study how they were introduced, how they have spread and whether they have been introduced multiple times. Again, if we understand how they’re spreading, we can do something to try to stop the spread,” she said.

Italian rye grass, a weed Jasieniuk is currently studying, is problematic because it is resistant to Roundup, a popularly used weed and grass killer by growers. “UC ANR Cooperative Extension specialist, now emeritus, Tom Lanini, and I sampled over 100 locations of Italian rye grass and tested them for resistance to Roundup ten years ago,” she said about the project, funded by USDA. “Last year, we re-sampled all of those sites, and we’re re-testing to see if there’s been an increase or a decrease or no change in resistance to glyphosate, to Roundup,” she said.

Roundup isn’t the only weed and grass killer available on the market. “We’re looking at resistance to three other herbicides,” she said. Working with growers to determine the most efficacious weed treatments that also reduce the likelihood of wood resistance to herbicides,” Jasieniuk explained, “We interview growers about their herbicide use, non-chemical approaches, and integrated management techniques to identify management practices that correlate highly with low or no resistance,” she explained.

Resistance management is found to be more effective with a rotation of various herbicides. “What you want to do is rotate different types of herbicides with different modes of action,” Jasieniuk said. “Perhaps do tank mixes and incorporate non-chemical approaches as well,” she added.

Eliminating weeds can be as simple as disking and digging them out with a shovel when there are only a few. “I think, in many cases, this would have done a lot to prevent new weeds from coming in and certainly resistant weeds from spreading,” she noted.

California Ag Today2021-05-12T11:05:53-07:00July 11th, 2016|