Mating Disruption For NOW Works

Trials Show that Mating Disruption Works Well to Offset NOW Damage

By Patrick Cavanaugh, Editor

Mating disruption for navel orangeworm works. David Haviland is a UCANR, farm advisor, Kern County. “We all know navel orangeworm is not a simple pest to control and it takes an integrated pest management approach. We know the base of that sanitation—getting rid of all the mummies in the winter to make sure that we reset the clock when navel orangeworm comes back in the spring,” noted Haviland.

“We know that the earlier you harvest, the better you’re going to be. So early and timely harvest is going to help. We know insecticides helped. They’ve been around a while and they’re effective and, certainly, people are using them,” said Haviland. “At the same time, those three things alone don’t always control the pest to the level you need. And that’s where mating disruption can come in as the other leg on the IPM chair.”

Haviland has tested the mating disruption products. Currently, there are three different groups of products registered. There are the aerosol products that releases pheromone throughout at certain intervals throughout the season. The second group, what we call the Meso emitter, that’s a rubber strip that’s hung in the trees that passively releases the pheromone all year and the third group, which is new, is as a sprayable pheromone. It’s one that you put in the tank and you spray it along with an insecticide or fungicide.

“In 2017 trials the big take-home message this that all three of the aerosol products were effective. They all work well, as does the Meso emitter, so all those work about the same,” noted Haviland.

In 2017/2018 Haviland had larger trials that confirmed their previous results. “The earlier trial showed a 40 to 50% reduction in damage, while the later trial on larger acreage showed a 60 to 70% reduction in damage, which was a positive return on investment to the grower,” he said. In 2018, Haviland conducted the first UC trial on sprayable pheromone products. They did not work very well.

California Ag Today2021-05-12T11:01:45-07:00November 15th, 2019|

Summer Annual Weeds Need Control Now

Avoid Allowing Summer Annual Weeds Going to Seed

By Chris McDonald UCANR Inland and Desert Natural Resources Advisor, San Bernardino County

As the summer heat is finally nearing its end, and its officially fall on the calendar, there unfortunately is a new crop of weeds flowering right now. Some of our summer annuls have started to go to seed, others are just about ready, and others are already starting to senesce. In order to manage these weeds, managers must stop the plants from reproducing. With our summer annuals that means stopping the plants from producing seeds, right about now, (or maybe three weeks ago).

However, treating a giant tumbleweed right now isn’t really my favorite activity. I’d rather spend my time treating small tumbleweeds and working more effectively and also using less labor and/or herbicides to do it in the process. (Well I’d rather not have any tumbleweed in the first place.)

If treating the weeds when they are small is more efficient and uses less pesticides, when can we treat them at the smallest? To answer this, we need to know when our summer annuals germinate. When do our summer annuals germinate? There are several different germination periods for ‘summer’ annuals. Some of our summer annuals actually germinate in the winter to early spring from January to March, others germinate in the spring from March through May.

Weeds like yellow star thistle and stinkwort germinate in the winter from January to March. Tumbleweed and goat’s head germinate in the spring (March to May). Despite their different starting times, they will all grow during the late spring and summer as small plants hiding under a crop of larger weeds or in open areas, until they get large enough in the mid-summer to grow tall and more noticeable than our long dead winter weeds.

Other summer annual weeds, like spurges (such as spotted spurge,Euphorbia maculata, and also some other spurges), can germinate throughout the spring and summer as long as the soil is moist and warm. This summer annual can be much shorter lived than the other summer annuals mentioned above. In the desert, spurges might germinate after a monsoon, in other locations they might germinate in areas that have been irrigated or receive a little extra moisture or where the soil is moist.

The summer annuals on your property might be growing right now because of insufficient weed management in the winter and the spring! Other summer annuals might have germinated with the onset of high temperatures and need to be controlled in the early summer.

This pattern does not hold true for all species and all conditions, especially if irrigation continues throughout the spring and summer, or if there is a late spring storm or if summer monsoons deliver rains early. Sometimes even some of our winter annuals which should have flowered in February to April, germinate late in the season, and flower in June. It’s unusual and it does also happen.

If you can figure out what species of summer annual weed you have, then you may be able to figure out when it germinated and prioritize your weed treatments for that time period, in the winter and spring for some species and in the heat of summer for other species. Hopefully you will save yourself some time instead of letting them all grow into bigger and harder to treat summer annuals.

California Ag Today2021-05-12T11:01:46-07:00October 8th, 2019|

California Oak Trees Harbor Insect-Eating Bats

Oak Trees in Vineyards a ‘Win-Win’ For Bats and Growers

By Pam Kan-Rice UC ANR Assistant Director, News and Information Outreach

Californians love their oak trees. During vineyard development, Central Coast grape growers often feel compelled to leave an old iconic oak standing, even if it ends up right in the middle of their vineyard. While driving through the Central Coast, it’s not unusual to see the pattern of vineyard rows broken by a majestic oak tree. Aside from their beauty, what are some of the ecosystem services that these majestic trees provide?

To find answers, a UC Cooperative Extension scientist in San Luis Obispo County collaborated with a U.S. Forest Service scientist to study how bats use blue oak and valley oak trees in vineyards. UC Cooperative Extension specialist Bill Tietje, a co-author of the study, says they focused on bats that eat insects because bat populations have declined dramatically in some areas due to habitat loss and disease. “And bats don’t hurt grapes. As a matter of fact, thanks to the huge number of bugs they consume, bats could be very good for a vineyard.”

To understand the potential value of remnant oak trees for insectivorous bats, the researchers placed microphones to detect bat calls within 14 Central Coast vineyards. The recordings revealed 11 species of insectivorous bats foraged within the vineyards. Bat foraging activity was 1.5 times greater at the trees compared to open, tree-less areas within the vineyard. And the bigger the tree, the bigger the number of bats it attracted.

“The study results suggest that the large oak tree in my vineyard not only increases the beauty and biodiversity of the agricultural landscape, but also attracts insect-eating bats that can provide natural pest control—a win-win,” said grape grower Jerry Reaugh, who cooperated with the researchers.

In fact, the trees more than doubled the number of insectivorous bats called woodland-adapted bats within the vineyards. The study indicates that the oak trees attracted woodland-adapted bats that would normally be absent from vineyards.

Tietje hopes that the free insect-reduction services provided by bats will increase grape growers’ incentive to manage and maintain the trees, and even to plant new oak trees in suitable areas around their vineyard, in mutual benefit to both agriculture and biodiversity.

“In addition to their value for insectivorous bats, remnant trees maintain bird and insect diversity by providing food, habitat, cover and stepping stones that facilitate the movement of wildlife within agricultural landscapes,” said Tietje.

This study comes at a time when declining blue oak and valley oak populations are of great concern.

“We hope the study will increase awareness of these beautiful and beneficial trees and make the case for conservation and restoration,” Tietje said. “Preserving and enhancing biodiversity in the midst of climate change is key to ensuring resilience in our landscapes and communities.”

The study by University of Washington graduate student Anne Polyakov, Theodore Weller of USDA Forest Service and Tietje is published in the September 2019 edition of Agriculture, Ecosystems and Environment.

California Ag Today2021-05-12T11:05:02-07:00September 2nd, 2019|

Bio-Control for Strawberry Growers

Strawberry Growers Lean on Biologicals to Manage Pest

By Jessica Theisman, Associate Editor

California Ag Today recently met with Surendra Dara, a UC Cooperative Extension entomologist based in San Luis Obispo County. According to Dara, California strawberry growers follow many sustainable options.

“Growers are well-educated and have a support system that provides information to them very regularly,” Dara said.

Growers try to apply as much of the IPMs as possible, but there is always a lot more scope in terms of using non-chemical alternatives. That is an area that has room to grow.

“The more we know about the options and their potential, they can be more adopted,” Dara said.

He explained that the strawberry growers often lean on biological insects such as beneficial mites that treat those damaging insects. It’s all part of IPM.

The insects are used outdoors along with in greenhouses.

“A bio-control is very well done in strawberries for mite control, but we do not have similar natural enemies for other pests,” Dara said.

There are botanical and microbial options for pest and disease management, and a lot of work is being done about understanding how they work and placing them in the right strategy.

“So, there is definitely plenty of options for us,” Dara said.

California Ag Today2021-05-12T11:01:47-07:00June 28th, 2019|

Tomato Spotted Wilt Virus Fights Back

New Strain Creates Challenges

By Mikenzi Meyers, Associate Editor

A new strain of the Tomato Spotted Wilt Virus has created a challenge among vegetable growers, making integrated pest management, or IPM, increasingly critical. Bob Gilbertson, plant pathologist at UC Davis, has insight and advice as to how farmers should tackle this new strain.

“The first thing is to know what’s out in your field. And there’s a good diagnostic test for curly top, spotted wilt, alfalfa mosaic, and other viruses,” Gilbertson said.

Bob Gilbertson

After the virus is confirmed, he encourages growers to explore their options of treatment. Prior to the new spotted wilt virus strain, growers could turn to the SW-5 resistance gene to cure their field. Unfortunately, Gilbertson explained, the new strain actually breaks that resistance, which is where IPM becomes even more important.

In the future, Gilbertson hopes to find additional resistance genes to break the new strain. Until that time comes, he wants to use good IPM to manage it.

Gilbertson further added, “Increased sanitation, removing overwintering hosts, weeds, and bridge crops like lettuce, and then timing the applications of thrips management better, to slow down the appearance of adult thrips that carry the virus,” are all examples of good IPM.

California Ag Today2021-05-12T11:01:50-07:00January 18th, 2019|

Frank Zalom Named Editor-in-Chief of Journal of Economic Entomology

UC Davis Professor to Head Distinguished Publication

News Release Edited By Patrick Cavanaugh

Integrated pest management specialist Frank Zalom, distinguished professor of entomology, UC Davis Department of Entomology and Nematology, and a past president of the Entomological Society of America (ESA) is the newly selected editor-in-chief of the Journal of Economic Entomology, the largest and most cited of ESA’s family of scientific journals.

Frank Zalom

The ESA Governing Board today announced that Zalom will succeed John Trumble, distinguished professor of entomology at UC Riverside. Trumble, editor-in-chief for 20 years, informed ESA in late 2017 of his intent to leave the role in 2018. In January, the journal’s editorial board launched a widespread search for his successor.

A 43-member of ESA and the 2014 president, Zalom will serve a five-year term as editor-in-chief. The journal publishes research on the economic significance of insects. It includes sections on apiculture and social insects, insecticides, biological control, household and structural insects, crop protection, forest entomology, and other topics.

“Dr. Frank Zalom’s career can be viewed as a model of applied entomology derived from an understanding of basic biology, and he is an ideal choice to be the new editor-in-chief of the Journal of Economic Entomology (JEE),” said ESA President Michael Parrella in an ESA news release.

“His unparalleled and broad expertise will serve to continue the journal’s growth as the publication of choice for applied entomological research and to build upon the legacy of Dr. John Trumble,” said Parrella, who is also dean of the College of Agricultural and Life Sciences at Idaho State University and former professor and chair of the UC Davis Department of Entomology and Nematology.

Zalom’s 40-year career intersects entomological research, teaching, and application. He served 16 years as director of the University of California Statewide Integrated Pest Management Program (UC IPM) and is the only entomologist in the UC system to receive a simultaneous appointment in teaching, research, and extension. He focuses his research on IPM of agricultural crops.

Editorial board chair Xuguo Zhou, associate professor of entomology at the University of Kentucky, said he and his colleagues are delighted to welcome Zalom as the next editor-in-chief. “We could not have asked for a better candidate in terms of vision, dedication, reputation, experience, and integrity,” Zhou said. “And we also express our deep gratitude to Dr. John Trumble, whose tireless work ethic and unerring leadership have driven JEE to such great success for so long.”

“I couldn’t be more pleased to be selected the next editor-in-chief of the Journal of Economic Entomology,” Zalom said. “I have spent the last 40 years of my career trying to solve economically important problems caused by arthropods using an IPM approach, and this journal, as well as ESA’s other journals, have always served as a primary foundation and outlet for research conducted in my lab. As I approach the end of my career, I hope to be able to dedicate my efforts to enhancing our Society’s influence on science and its application to addressing some of the most important entomological challenges that affect communities worldwide. JEE is uniquely positioned to do exactly that.”

Zalom joined the UC system in 1980, serving in roles ranging from extension IPM coordinator to professor to vice chair of the department to advisor of the UC Davis International Agricultural Development Graduate Group. He has authored more than 335 journal articles and book chapters. including “Food, Crop Pests, and the Environment” published by APS Press.

His career includes serving as major professor for 12 Ph.D students and seven master’s degree students.

Zalom is a fellow of the California Academy of Sciences, the American Association for the Advancement of Science, the Royal Entomological Society, and ESA. Among his numerous honors: a Fulbright Senior Research Scholarship (1992-93), the ESA Achievement Award in Extension (1992), the ESA Recognition Award (2002), the James H. Meyer Award from UC Davis for teaching, research and service (2004), the Entomological Foundation IPM Team Award (2008), the Entomological Foundation Excellence in IPM Award (2010), Outstanding Mentor Award from the UC Davis Consortium for Women and Research (2013) and the C. W. Woodworth Award (2011), the highest award given by the Pacific Branch of ESA (PBESA).

More recently, Zalom received a lifetime achievement award, presented at the 9th International IPM Symposium, held March 19-22 in Baltimore. Last month he played a key role in a U.S. Congressional briefing held in the Rayburn House Office Building to raise awareness for and increase understanding of areawide integrated pest management (AIPM) and the benefits of a comprehensive pest management policy, particularly as it relates to invasive species.

Zalom, who received his doctorate in entomology from UC Davis in 1978, holds two degrees in zoology and ecology from Arizona State University (bachelor of science, 1973, and master’s degree, 1974).

Founded in 1889 and headquartered in Annapolis, Md., ESA is the world’s largest organization serving the professional and scientific needs of entomologists and people in related disciplines.

California Ag Today2021-05-12T11:05:11-07:00June 25th, 2018|

Navel Orangeworm Control Critical

Orchard Sanitation is Critical This Season To Lower NOW Numbers

By Patrick Cavanaugh, Farm News Director

Emily Symmes is the area Integrated Pest Management farm advisor for the Sacramento Valley in the statewide IPM program. She recently spoke to California Ag Today about the high level of Navel Orangeworm (NOW) damage in nut orchards throughout California this past season.

“We had a lot of unique circumstances. The amount of rainfall we got in late 2016 into 2017 was pretty unprecedented and really led us into a really bad navel orangeworm year because we couldn’t get out and sanitize our nut crops,” she said.

Emily Symmes

“NOW is ubiquitous, and there is an increased nut crop footprint in California, with more than one million acres of almonds, plus pistachios and walnuts,” Symmes explained. “All play host to NOW, as well as a host of natural plants. This thing isn’t going anywhere. And it was pretty bad in 2017 in terms of harvest damage.”

One of the key factors for higher navel orangeworm damage was not being able to get into the fields because of the standing water.

“There were a couple of other factors as well. Typically, rainfall and moist conditions can help NOW mortality in the winter. We tend to think that it can help rot the nuts and do us some favors, but we have to be able to get out and get the nuts shaken or get pulling crews in and get those things on the ground. And then them being on the ground is not always a sure thing. Sanitation was huge in terms of NOW problems this year,” Symmes said.

Heat units also played a part in the development of more NOW pressure. There were a lot of moths flying around longer and laying eggs.

“It got hot in mid to late June, and it seemed to just not let up. What that meant was, in terms of our degree-day models or the heat unit that drive insect development, it ended up getting pretty far out ahead of what is typical, if there is anything such as typical. But certainly ahead of the last couple of years,” Symmes explained.

By September, we were about two weeks ahead in degree-days and that means that the moths were out earlier. They’re flying around. They’re laying eggs on the nuts when they’re still on the trees.

Symmes stressed that the importance of sanitation is to minimize the site where the NOWs mature.

“It’s really important to remember that sanitation efforts aren’t just directly killing any worms that are over-wintering in your orchard. Yes, it does that. But it also minimizes those sites where your first and second generations are going to develop next year,” she said.

California Ag Today2021-05-12T11:01:58-07:00November 29th, 2017|

Future of Integrated Pest Management

IPM: A Decision Making Process

By Joanne Lui, Associate Editor

Lori Berger is the academic coordinator for the University of California’s statewide Integrated Pest Management program. She spoke with California Ag Today recently about the sustainability of IPM and where it’s heading in the future.

“IPM is part of a sustainable approach to pest management. It’s very holistic. It’s a decision-making process. It incorporates all factors in an environment and in a situation, and it uses all human resources.”

Berger believes that even though IPMs are sustainable, the system might not work as well as it should.

“IPM has been around for 50 years, but our system is somewhat stuck in that we tend to be more reactive than proactive,” she explained. “If there’s an event such as an invasive pest or some … pesticide incident, some huge regulatory change or some legislative pressure, it’s like all of a sudden the system needs to reboot itself. We need to look deeper into the system and be working in a more embedded way across platforms and people.”

Berger told us that instead of looking at things in a linear way, it’s important to look at all the parts and how they relate to each other to find flaws in the system.

“As scientists, we tend to look at things cause and effect. We were looking into optimizing the whole by looking at the parts, but now taking things that are more of a systemic level, we’re trying to looking at the parts and also how they work in relationship to each other. That’s to where we can realize some of our biggest gains that there’s not as much at stake, or there’s less risk for all parties, and people are more aware of what’s going on.”

Patrick Cavanaugh2021-05-12T11:01:58-07:00November 28th, 2017|

Push Back NOW with Orchard Sanitation

Part One of a Series

Orchard Sanitation Critical This Season

By Patrick Cavanaugh, Farm News Director

We recently spoke with Emily Symmes, the UC Area Integrated Pest Management farm advisor for the Sacramento Valley in statewide IPM program. She told California Ag Today about few reasons as to why Navel Orangeworm damage was so devastating this year, costing tree nut growers at least $137 million.

UC Cooperative Extension Integrated Pest Management Advisor, Butte County

Emily Symmes, UC Cooperative Extension Integrated Pest Management Advisor, based Butte County.

NOW is ubiquitous. And the nut crop footprint in California is larger, with one million acres of almonds, along with pistachios and walnuts up and down the San Joaquin valley.

“The pest is not going anywhere,” Symmes said.

“We had a lot of unique circumstances. The amount of rainfall we got in late 2016 into 2017 was unprecedented and led us into a bad navel orange worm year because growers couldn’t get out and sanitize their orchards”

“Growers were not able to get into their orchards because of standing water,” Symmes explained.

Also, rainfall and moist conditions can help NOW mortality in the winter. “

We tend to think that it can help rot the nuts and do us some favors, but we have to be able to get the nuts shaken or get pulling crews in and get the mummies on the ground and destroyed,” Symmes said.

Heat units also played a part in the development of more NOW.

“It got hot. And it seemed to just not let up. Our degree-day models, or the heat unit that drive insect development, ended up getting pretty far out ahead of what is typical,” Symmes explained.

“By September, we were about two weeks ahead in degree-days, and that which meant moths were out earlier. They’re flying around. They’re laying eggs on the nuts when they’re still on the trees, and we are talking almonds, pistachios and to a lesser extent, walnuts.”

Symmes said the importance of sanitation is to minimize the site where the NOWs mature.

“It’s really important to remember that sanitation efforts aren’t just directly killing any worms that are over-wintering in your orchard. But the other thing that it does is it minimizes those sites where the first and second generations are going to develop next year,” she said.

Despite all these circumstances as to why NOW was serious this this year, it is critically important to start orchard sanitation as soon as possible. It may not be a good idea to wait for rain and fog to help loosen the nuts this season.

California Ag Today2021-05-12T11:01:58-07:00November 13th, 2017|

Cheryl Foster Talks California CattleWomen

Meet Cheryl Foster, President of California CattleWomen

By Patrick Cavanaugh, Farm News Director

Cheryl Foster is the President of the California CattleWomen and a sixth generation rancher. Her operation ranch house is in Siskiyou County, about seven miles from the Oregon border. It’s a cow-calf operation on deeded ground, as well as forest service leased ground.

“It all started back in 1871, with a livery stable in Yreka, and then when that burned down, my family went out and bought the ranch land. My grandfather, John Foster is the one who really expanded the ranch,” Foster said.

The cattle breed on the ranch is predominantly Hereford and Red Angus cross. “That cross helps a lot with the fertility and longevity of the cow,” Foster said. “It’s Northern California and pretty tough country, with hillsides and lots of rocks. You put cattle where you can’t have row crops, so it’s rough!”

Foster’s husband is a CPA; she runs the cattle operation with her brother. “My brother is responsible for equipment, and I’m responsible for the cattle and the irrigating our 450 acres of hay, so we have it divvied up well,” she said.

Foster focuses on the primary tasks of California CattleWomen. “We are trying to get the women to be engaged with the truth about the industry and keep pushing, because it’s a very, very important industry,” she said.

“We get out and tell a positive story, because I think sometimes we are afraid of what to say to counteract when people come in with wrong information. So, real important to get good information out and get the ladies confident to get out and say that we are doing a good thing for the land,” Foster noted.

Foster explained the traditional roles of the men and the women in the California cattle industry. “The men’s organization has been going for a 100 years and the women have been going for 65 years,” she said.

“Initially, the men and their organization were more on the production, and the genetics of the herd. The women started being the beef promoters, to get out there and say, ‘It’s not just about the production. People need to eat our product,’ ” Foster explained.

The CattleWomen are out and about wherever they can spread the positive word on the beef industry. They go to fairs and trade shows and participate in the California Agriculture in the Classroom, where they engage in K-12 audiences and improve agricultural literacy.

Patrick Cavanaugh2017-02-20T16:12:28-08:00February 17th, 2017|