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|

Steve Koike on Resistant Cultivars

The Search for Resistant Cultivars

By Emily McKay Johnson, Associate Editor

In the second part of our series with Steve Koike, plant pathology farm advisor for UC Division of Agriculture and Natural Resources, Cooperative Extension in Monterey County, the focus is on the critically needed research on resistant cultivars. Koike, who has focused his research since 1989 primarily on the understanding of disease systems and the investigation of new methods of disease control, said, “The role or the need for resistant cultivars is tremendous.”

“Some good case studies of resistant cultivar research address soil-born problems on lettuce,” Koike explained. “For example, Fusarium wilt and Verticillium wilt on lettuce could be managed lightly; but in order to overcome those diseases, resistant lettuce varieties need to be in place.”

Steve Koike, UC Cooperative Extension, Monterey County.

“First discovered in 1995 on the Central Coast,” said Koike, “Verticillium wilt has the potential to infect and damage numerous different crops. And although Fusarium wilt was typically unseen in the San Joaquin Valley, it has recently begun to appear on the Central Coast.”

Continued improvement of management techniques upon discovering initial disease symptoms is necessary, according to Koike. “Symptoms of the disease usually appear on the lower leaves of plants, around the edges, and the areas between the veins can turn a yellowish-brown.”

“Strawberries currently have three really important disease pressures state-wide: Verticillium wilt, Macrophomina (charcoal rot) and Fusarium wilt,” Koike commented. “Even the fumigation tools we have are not cleaning them up 100 percent, so we have problems.”

“We will continue to have problems,” Koike elaborated, “until there are truly resistant strawberry varieties to those pathogens. Plant breeders understand that IPM management of these diseases is so dependent on developing resistant varieties,” he said, “but we’re not there yet. We do not yet have truly resistant lettuce or strawberry varieties out in the field,” Koike said.

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Koike and his fellow researchers discovered a new race of the downey mildew pathogen in spinach that has been designated race 16. While there are some varieties that are supposedly resistant to race 16, Koike noted that there is still more research to be done.

To read the first part of our series on Downey Mildew, click here.

California Ag Today2021-05-12T11:05:54-07:00June 27th, 2016|

New IPM Work on Brown Stink Bug

New IPM Approach to Brown Stink Bug In Desert Cotton

By Patrick Cavanaugh, Farm News Director

This year, the UC Division of Agriculture and Natural Resources, Cooperative Extension, Riverside County began an Integrated Pest Management (IPM) program to control Euschistus servus, or brown stink bug, a problem in Southern California’s cotton production areas.

Vonny Barlow, a UC Cooperative Extension farm advisor in Riverside County

Vonny Barlow, a UC Cooperative Extension farm advisor in Riverside County began evaluating brown stink bug in cotton last year, and he received additional funding this year from a National Institute of Food and Agriculture (NIFA) grant administered through North Carolina State University, to continue his research this year. Barlow just hired two interns to work with brown stink bug in the Palo Verde Valley in Southern California.

The pest was known to exist in Arizona for about eleven years, but was not a critical issue until about three years ago, when it moved into California. California cotton growers had to spend a lot of money to spray to manage the insect, and it just wasn’t economically feasible.

“In many areas in the south, the brown stink bug pierces into the cotton boll with its proboscis-like mouthpart—a stiff, short straw,” said Barlow. “Once the cotton boll is pierced, the brown stink bug tries to feed on the cotton seed. The problem is the puncture allows bacteria to enter and boll rot to set in. Boll rot is the issue because it lowers yield quality; without boll rot, the brown stink bug is much more of a manageable pest.”

Spraying is not the answer to control the bug, according to Barlow. “We are going to look at an area-wide pest management approach by just essentially surveying the pest control advisers (PCAs) and growers about cropping that is near or even some miles away from cotton,” he said. “Where is the brown stink bug showing up? When did it show up? Is it moving? When are you going to harvest? Is it moving into the cotton? That way, we can give the cotton growers a better idea of when they should start management practices for brown stink bug, instead of just routinely calendar-spraying every two weeks.”

“We hope to predict when brown stink bug will move into cotton. Farmers who just harvested wheat should expect it will come into your field within the week. Start scouting; it is another very good IPM tactic to reduce sprays and to better manage pests,” said Barlow.

Featured image: Brown Stink Bug (Source: Brown Stink Bug (Source: “Chemical Efficacy Trial using Select Insecticides against Brown stink bug, Euschistus servus on Commercially Planted Cotton” by Vonny Barlow, University of California, Agricultural and Natural Resources, Riverside County, April 2016 issue of “Postings from the Palo Verde” newsletter)

California Ag Today2021-05-12T11:05:54-07:00June 23rd, 2016|

Downey Mildew Continues to Challenge Leafy Greens

Downey Mildew Continues to Threaten Lettuce and Spinach

By Patrick Cavanaugh, Farm Director

One of the many facets that makes California Agriculture so successful is the hard-working group of farm advisors who assist growers with a multitude of plant and pest issues. Steve Koike, plant pathology farm advisor for UC Division of Agriculture and Natural Resources, Cooperative Extension in Monterey County, noted, “It has been a fairly typical year, and I wouldn’t say any particular new disease has been noteworthy, which is good for the growers.”

Steve Koike, farm advisor of UC ANR Cooperative Extension, Monterey County.

Koike, whose research focuses primarily on understanding disease systems, identifying new diseases and examining new methods of disease control, said growers “don’t like to see new diseases come out of our work. The main concern, downey mildew, continues to be challenging for both lettuce and spinach growers.”

“We started in the early spring with heavy mildew on both lettuce and spinach crops,” explained Koike, “and it’s remained pretty heavy on lettuce throughout the spring and early summer here. Spinach downey mildew goes up and down, which is not unusual.” he said. “We had some heavy mildew weeks for spinach growers, then we didn’t hear anything, then we heard that it had died down, and then ten days ago there was another surge. It’s one of those things that is hard to predict because it is variable.”

Since starting his farm advising position in 1989, Koike has been involved in educational programs and applied research in vegetable, fruit and ornamental crop diseases. Because downey mildew can overwinter in perennial crops, its continued occurrence is not too surprising.

“Earlier this year, Jim Correll, my cooperator at University of Arkansas, other leaders in the industry and I finally did confirm race 16, a new biotype of downey mildew. A few years ago, it was only race 12; it is moving target,” he noted.

“Although we have confirmed Race 16 on spinach, we are a little concerned because there are reports of disease on some race 16-resistant varieties.” Koike said.

Featured image: Downey Mildew (Source: UCANR Cooperative Extension, Tehama County)

California Ag Today2021-05-12T11:05:55-07:00June 22nd, 2016|

It’s Avocado Month!

Celebrate the Magic of California Avocados.

By Emily McKay Johnson, Associate Editor

Chefs and foodies alike, get ready for California Avocado Month which begins TODAY, June 1st. Menus across California are celebrating this magical fruit, not only for its postive health benefits as a source of Omega-3 and Vitamin E, but also for its resiliency to thrive in spite of the prolonged drought.

“Avocados are at their peak of the season,” said Jan DeLyser, vice president of marketing for the California Avocado Commission (CAC), “so we’re in very good supply and their eating quality is just second to none.”

Avocados are so diverse, they can be incorporated into daily menus for breakfast, lunch, dinner, snacks, beverages and even desserts. Consider celebrating summer gatherings with chocolate avocado pudding, avocado ice cream or, perhaps, even an avocado cake. Links to recipes are included at the end of the article.

Would you believe California avocados can be used as a butter alternative—with 300 fewer calories per quarter cup serving?

Despite entering year five of the drought, California and its farming industry received enough rain in the northern part of the state this year to replenish reservoirs and actually increase this year’s avocado harvest. Roughly 4,000 growers on approximately 53,000 acres have harvested 392 million pounds of avocados.

“We actually have more fruit this year than we had last year,” acknowledged DeLyser. “Our growers are continuing to be good stewards of the resources that are available to them and able to produce avocados for us all to enjoy throughout the summer months.”

The CAC’s collaboration with chefs around the country to feature California avocado items, helps support growers of the tree-bearing fruit in the state. Approximately 90 percent of the nation’s avocado crop comes from fertile, California soil, mostly on small family farms, which can ensure the avocados are carefully handled and inspected.

Recipes incorporating delectable avocados: Chocolate Avocado Cake, Avocado Ice Cream

California Ag Today2021-05-12T11:05:56-07:00June 2nd, 2016|

New Citrus PSA Shows Homeowners HLB Threat

By Charmayne Hefley, Associate Editor

Without the involvement and aid of backyard citrus growers to prevent the spread of the invasive Asian Citrus Psyllid (ACP) and the citrus-deadly Huanglongbing (HLB) disease vectored by the ACP, consumers would no longer have the opportunity to enjoy fresh citrus. “Deadly Plant Disease Threatens California Citrus,“ the newest public service announcement (PSA) from California Citrus Pest Disease and Prevention Program (CCPDPP) conveys this message to residential citrus growers, according to Joel Nelsen, California Citrus Mutual (CCM) president, in order to keep all citrus safe from HLB.

CA Citrus Pest and Disease Prevention Program’s Citrus PSA on HLB Fight, “Deadly Plant Disease Threatens California Citrus”

Nelsen said the citrus PSA announcement “shows a family in the backyard barbequing and doing what families do on a weekend.” They walk over to their row of three citrus trees in the backyard when an orange falls off the tree and disappears, followed by the disappearance of all three trees. Nelsen said the PSA zeros in on the family members’ confusion at the disappearance of the oranges and the trees, all associated with the HLB infection.

CCPDPP’s new PSA is a way for homeowners to understand the importance of keeping citrus safe from HLB, said Nelsen, ”because as much as they’re emotionally tied to their trees, so are the growers in our industry. We don’t want to see anyone’s tree get eliminated because of HLB.”

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Prevent HLB; Check Your Citrus Trees for Asian Citrus Psyllid

In a new four-minute video, University of California, Division of Agriculture and Natural Resources (UC ANR) scientists encourage California farmers and home citrus growers to check new growth on their citrus trees for Asian citrus psyllid infestation. As ACPs spread Huanglongbing (HLB) disease, a serious, incurable threat to both the citrus industry and backyard citrus trees, scientists aim to minimize the ACP population until researchers find a cure.

UC ANR video, “Check your Citrus Trees for Asian Citrus psyllid“

A flush of new leaf growth on citrus trees announces spring in California. The emergence of feathery light green leaves is particularly attractive to Asian citrus psyllids (ACP), signaling a critical time to determine if the trees are infested with ACPs.

“We encourage home citrus growers and farmers to go out with a magnifying glass or hand lens and look closely at the new growth,” said Beth Grafton-Cardwell, UC Agriculture and Natural Resources (UC ANR) citrus entomologist. “Look for the various stages of the psyllid – small yellow eggs, sesame-seed sized yellow ACP young with curly white tubules, or aphid-like adults that perch with their hind quarters angled up.

Pictures of the ACP and its life stages are on the UC ANR website. Call the California Food and Agriculture (CDFA) Exotic Pest Hotline at (800) 491-1899 with any findings.

The UC ANR ACP website provides help in finding the pest and taking action.

(Source: UC ANR)

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California Ag Today2021-05-12T11:03:03-07:00March 30th, 2016|

Citrus Growers Form ACP Management Areas

Commercial Citrus Growers Form Local ACP Management Areas

By Charmayne Hefley, Associate Editor

Commercial citrus growers are banding together to prevent the spread of the citrus-deadly Huanglongbing (HLB) disease and the pest that spreads it—the Asian Citrus Pysllid (ACP). Beth Grafton-Cardwell, an IPM specialist and research entomologist at UC Riverside and Director of UC ANR Lindcove Research & Extension Center, said growers are forming ACP management areas to prevent ACP from spreading HLB.

Elizabeth E. Grafton-Cardwell

“ACP management areas are being formed by the citrus industry and community,” Grafton-Cardwell said. “They’re basically saying, ‘Let’s get together. Let’s form these groups of growers—25 to 35 growers in an area. Let’s work together as neighbors to treat across a large area and get more of the psyllids killed than if we each treated individually at different times.’”

HLB is a serious concern to growers, according to Grafton-Cardwell; the disease has already devastated the citrus industry in Florida. “We want to prevent that from happening here,” shel said.

According to the California Department of Food and Agriculture, ACP notices posted thus far in the first quarter of 2016 include the following areas:

COUNTY CITY

Fresno County	Fresno
Kern County	Bakersfield, Shafter, Wasco
Imperial County	Bard, Brawley area, Calipatria, Niland, Winterhaven, Zone 7
Los Angeles County	La Puente, San Gabriel
Riverside County	Hemet, Riverside, San Jacinto
San Bernardino County	Cadiz
San Diego County	De Luz, Escondido, Fallbrook, Ramona, San Diego
San Joaquin County	Stockton
Santa Barbara County	Areawide, Buellton, Casmalia, Garey, Orcutt, Santa Maria, Sisquoc
Santa Clara County	Milpitas, San Jose
Stanislaus County	Oakdale
Tulare County	Porterville, Strathmore

California Ag Today2021-05-12T11:03:03-07:00March 17th, 2016|

PCA Training At UC Davis

UC Davis Offers Pathway to PCA Training

By Laurie Greene, Editor

Frank Zalom, distinguished professor of entomology, agricultural experiment station entomologist, and extension specialist at UC Davis, teaches a class for students that forms a pathway to becoming a Pest Control Advisor (PCA). “It is the only class that a lot of them had ever taken in entomology,” said Zalom, “so we try to structure it to give them a good, solid background in entomology. Then we lead them through all the different pest management options. We even bring in someone from the California Association of Pest Control Advisors (CAPCA) Pathway to PCA program for the very last lecture.”

Zalom, whose research interests include integrated pest management (IPM), tree crops, small fruits and vegetable crop entomology, wants to provide a valuable education to his students. “Most of the kids taking my classes are interested in taking the PCA exams and there is a huge opportunity for those students out in the future.”

“We teach them about integrated pest management (IPM) and the pests,” Zalom noted. “Then we show them some of the many career opportunities for PCAs,” he said, adding. “There will always be a big need for professional PCAs to help protect our crops from pests and diseases. They assist growers all over the state.”

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Links:

California Association of Pest Control Advisors (CAPCA)

CAPCA Pathway to PCA

California Ag Today2021-05-12T11:03:03-07:00February 24th, 2016|

Lorsban Under Scrutiny

Chlorpyriphos (Lorsban) Must be Used More Carefully

By Patrick Cavanaugh, Deputy Editor

California Department of Pesticide Regulation (DPR) reports an important, broad-spectrum organophosphate insecticide known as Chlorpyriphos, or Lorsban, may be further restricted due to evidence of potential human health and environmental risks, presence (parts per billion) in some California waterways, and pressure from the EPA. Brian Leahy, director of the California Department of Pesticide Regulation, said, “Chlorpyriphos is an important tool and we know there are important times when you have to use it.”

Registered and widely used in agriculture across the nation for more than 40 years, DPR has made it a restricted-use material. Leahy said, “We are trying to work with the grower community to improve how they use it. We are also working with UC IPM to look at essential needs, but we know that as we look at Chlorpyriphos, we are going to have to put additional restrictions on it.”

“We simply need for it to stay on target, and not be getting into the human body. We are seeing that it is, and we are going to continue to make sure that people use it thoughtfully and wisely,” he said.

And Leahy is very confident that growers can use this material and keep it on target, “I have seen farms that use it only when they really need it, and that is what we want. We can’t lose this tool and we are going to keep it only by showing we can greatly reduce off-site movement to the human body and watersheds,” he noted.

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Resources:

According to the University of California Agriculture and Natural Resources 2014 Chlorpyrifos Report entitled, “Identifying and Managing Critical Uses of Chlorpyrifos Against Key Pests of Alfalfa, Almonds, Citrus and Cotton“:

Chlorpyrifos plays a critical role in many IPM programs for controlling pests that threaten the productivity and economic well-being of California producers and in maintaining the high quality standards required by consumers and international export markets. This active ingredient also allows production of animal feed to support the important dairy industry in California. For some pests, chlorpyrifos is one of the last effective organophosphate insecticides available and may provide an important alternative mode of action for insecticide rotations to prevent the development of resistance to newer insecticide products. For others, this product is one of very few products with international registrations with established maximum residue limits (MRLs) that allow unhampered trade. Chlorpyrifos may also be a key tool for controlling invasive pests as well as endemic pests occasionally found in extremely high population densities.

The California Department of Pesticide Regulation reports that the combined use of chlorpyrifos in alfalfa, almonds, citrus, and cotton has decreased since 2006.

Although newer insecticides are also available to manage some pests in these four crops, there is a continued need to preserve the availability of chlorpyrifos for specific situations.

“Assessing the Health Risk of Pesticides,” California Department of Pesticide Regulation

California Ag Today2021-05-12T11:03:04-07:00February 16th, 2016|

Biocontrols Conference & Expo

Biocontrols Conference & Expo, March 3-4, 2016, Monterey, California

Learn everything you need to know about agricultural biocontrols from the experts.

Join your peers, leading organizations and industry experts at the Biocontrols Conference & Expo for two days of hands-on education devoted solely to the use of biocontrols in agriculture presented by Meister Media Worldwide, a media solutions provider for worldwide specialized agriculture, in cooperation with the Biopesticides Industry Alliance (BPIA), and the California Association of Pest Control Advisers (CAPCA). The Biocontrols Conference offers educational sessions, continuing education credits (CEUs) for pest control advisers (PCAs), certified crop advisers (CCAs) and other state certification programs, and an expansive Expo with top suppliers of biocontrol products and related services.

New for 2016!

Two optional, concurrent add-ons on the last afternoon of the event (additional fees may apply):

1.Tour of two leading Monterey-area specialty-crop growing operations that use biocontrols as part of their integrated pest management programs:

-Biocontrols USA Tour

-Pacific Plug and Liner, Watsonville, CA

2.Hands-on workshop on the use of beneficial insects in a greenhouse environment

Agenda Sampling:

-8 Tips To Get The Most Out of Your Biocontrols Program

-A look at the most common active ingredients and how to handle them to get the best results, Lance Osborn, UF IFAS

-What’s Next In Biocontrol?

-Regulatory Update, Bob McNally, EPA

-Pipeline Update – what types of new products are coming?

-The Future Isn’t Biocontrol. It’s IPM

-Understand The Value of Biopesticides – Do they Pencil Out for You?

-How To Evaluate/Field Test a New Research Biopesticide

-Biopesticides and Beneficials: Make Them Work Together, Frank Sances, Pacific Ag

-Fruit and Tree Nuts: Hands-on, How-To Topics

-Using Green Lacewings in almond and pistachio, Brad Higbee, The Wonderful Co.

-Vegetables: Hands-on, How-To TopicsMycorrhizae: Why it Makes Sense in Strawberries, Johan Pienaar, Mycorrhizal Applications.

Monterey Bay, the conference location, is in close proximity to the heart of major California specialty-crop production: vegetables, fruits, and ornamentals in Monterey County and the Salinas Valley, and affords you the opportunity to tie-in a long weekend in the Monterey Bay area.

Meister Media Worldwide and its leading family of brands including American Vegetable Grower®, Western Fruit Grower® / American Fruit Grower® and Greenhouse Grower®, CropLife®,

Having celebrated its 15th anniversary in September 2015, BPIA is dedicated to fostering adoption of biopesticide technology through increased awareness about their effectiveness and full range of benefits to a progressive pest management program.

Dedicated to the professional development and enhancement of its members’ education and stewardship, the California Association of Pest Control Advisers (CAPCA) represents more than 75% of the nearly 4,000 California EPA licensed pest control advisers (PCAs) that provide pest management consultation for the production of food, fiber and ornamental industries of this state.

California Ag Today2021-05-12T11:05:58-07:00January 28th, 2016|

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California Ag News…
At Your Fingertips!

Tracking Herbicide Resistance in Weed Evolution

By Emily McKay Johnson, Associate Editor

The Search for Resistant Cultivars

By Emily McKay Johnson, Associate Editor

New IPM Approach to Brown Stink Bug In Desert Cotton

By Patrick Cavanaugh, Farm News Director

Downey Mildew Continues to Threaten Lettuce and Spinach

By Patrick Cavanaugh, Farm Director

Celebrate the Magic of California Avocados.

By Emily McKay Johnson, Associate Editor

New Citrus PSA Shows Homeowners HLB Threat

By Charmayne Hefley, Associate Editor

Prevent HLB; Check Your Citrus Trees for Asian Citrus Psyllid

Commercial Citrus Growers Form Local ACP Management Areas

By Charmayne Hefley, Associate Editor

COUNTY CITY

UC Davis Offers Pathway to PCA Training

By Laurie Greene, Editor

Links:

Chlorpyriphos (Lorsban) Must be Used More Carefully

By Patrick Cavanaugh, Deputy Editor

Resources:

Biocontrols Conference & Expo, March 3-4, 2016, Monterey, California

Learn everything you need to know about agricultural biocontrols from the experts.

Sign Up For Our Newsletter!

California Ag News… At Your Fingertips!

California Ag News…
At Your Fingertips!