Posts Tagged: REC
Understanding cattle grazing personalities may foster sustainable rangelands
Matching herds to landscape can support animal growth and ecological needs
Not all cattle are the same when it comes to grazing. Some like to wander while others prefer to stay close to water and rest areas.
Recognizing those personality differences could help ranchers select herds that best meet grazing needs on rangelands, leading to better animal health and environmental conditions, according to a new paper from the University of California, Davis, published in the journal Applied Animal Behaviour Science.
“Cattle can actually be beneficial for the rangelands,” said lead author Maggie Creamer, who recently earned her Ph.D. in animal behavior at UC Davis. “Vegetation in rangelands actually need these kinds of disturbances like grazing.”
Ranchers can add elements to the rangeland such as water, mineral supplements and fencing to influence where cattle graze, but little research has been done on how those efforts affect individual cows. Considering personalities could save money.
“If you're spending all this money to add a management tool in order to change the distribution of your animals, that's a huge cost to ranchers,” said Creamer. “Thinking about other tools, or selecting certain animals with these grazing traits, might be a better way to optimize the distribution on rangeland rather than spending a bunch of money for something that may ultimately not pan out for all your animals.”
Effects of grazing
Livestock graze on an estimated 56 million acres in California, and healthy rangelands host native vegetation and animals, foster nutrient cycling and support carbon sequestration.
Uneven grazing can degrade water quality, soil health and habitats. Optimizing grazing — including the even spread of cow pies — can improve the ecosystem while also reducing fuel loads for wildfires.
To better understand individual grazing patterns, researchers went to the UC Sierra Foothill Research and Extension Center in Browns Valley and tracked 50 pregnant Angus and Hereford beef cows fitted with GPS collars.
The research
The cattle, which were tracked from June to August over two years, had access to 625 acres of grasslands and treed areas ranging in elevation from 600 to 2,028 feet. In the second year, a new watering site was added at a higher elevation.
Across the two years, the cows showed consistent and distinct grazing patterns even when water sources changed. Age and stage of pregnancy did not affect patterns, though cattle tended to clump near water and rest sites on hotter days.
The cows that ventured into higher elevations and farther from watering sites had more variability in their grazing patterns than those that stayed at lower elevations near water. That suggests it may be harder for non-wanderers to adjust to some landscapes.
“Thinking about the topography of your rangeland and your herd of cows can benefit both the animals and the sustainability of the land,” said Creamer, who next month begins work as a postdoctoral scholar in North Carolina.
Gauging personalities
Keying in on personality type may sound difficult, but the researchers also found some clues as to how to pinpoint the wanderers and homebodies. Unlike cattle at feedlots, the breeding cow population, especially on rangelands in California and other western states, live largely “wild” lives and are rarely handled, save for vaccinations and weaning.
Research due to be published later this year found that paying attention to individual cow reactions during those events can help determine personalities. The cows that appeared more passive during those handling interactions tended to be nomadic.
“We found that you can maybe predict those hill climbers if you kind of look at how they act when the veterinarian or rancher handle them,” said senior author Kristina Horback, an associate professor in the Department of Animal Science at UC Davis.
Informing practices
For ranchers, the findings could be invaluable, said Dan Macon, a livestock and natural resources Cooperative Extension advisor in Placer and Nevada counties for UC Agriculture and Natural Resources.
“Any time we can improve our understanding of cattle behavior, particularly at the individual level, it can improve how we handle livestock and manage the landscape,” he said.
Macon said that during the recent drought, it was hard to get cattle into higher country, but if ranchers could have selected the nomads, it may have saved money in terms of ranch labor and other efforts.
“If you ask a rancher who has been attentive to their cattle over many years, they know the personalities,” Macon said.
For Creamer and Horback, the research opens new doors into understanding herd behavior and dynamics, one that could be a cheaper alternative to high-tech solutions.
“Animal science tends to look overlook the mind of the animal when searching for solutions to challenges,” Horback said. “It's always been a direct line to genetics for immunity or nutrition, but nothing about the mind of the animal. And that's such a loss. There's so much we can learn from behavior in the end.”
The Russell L. Rustici Rangeland and Cattle Research Endowment supported the research.
This article was first published on the UC Davis News site.
/h3>/h3>/h3>/h3>/h3>From Sharqia to Rome to Fresno: Renowned irrigation expert comes to UC ANR
Atef Swelam begins as director of Kearney and West Side Research and Extension Centers
In the fields around the Egyptian city of Minya Al-Qamh, “port of wheat” in Arabic, a boy rubbed his eyes wearily as he helped his father irrigate their crops at 2 a.m. – when they could access the scarce water that reached their farm, located at the tail end of the canal. The family, which had been farming the land around the village of Sharqia for many generations, barely had enough water to sustain their wheat and vegetables.
Swatting in the darkness at the incessantly biting mosquitoes, a young Atef Swelam made a vow.
“I said: ‘I will do my best to not let anyone suffer like I have suffered, like my father suffered – I will help to improve the lives of others,'” recalled Swelam, who went on to become an irrigation engineer improving water-use efficiency.
During the World Food Forum (Oct. 16-20), Swelam was recognized by the United Nations' Food and Agriculture Organization as a “Water and Food Hero” for developing irrigation techniques that save water and boost yields across the Nile Delta and beyond.
Swelam started on Aug. 10 as director of both the Kearney Agricultural Research and Extension Center in Parlier and the West Side REC in Five Points. Both facilities are part of a network of centers operated by University of California Agriculture and Natural Resources.
“Our organization, and more importantly the communities we serve in the Central Valley and across California, are so fortunate that Atef has joined our team,” said Brent Hales, UC ANR associate vice president for research and Cooperative Extension. “He brings not only a record of truly impactful research and innovation but a genuine passion for learning the needs of people, working with them and developing collaborative, science-based solutions.”
Making a difference in the lives of people
After earning his master's degree in land and water management from the Mediterranean Agronomic Institute of Bari in Italy, Swelam returned to Egypt for his Ph.D. in agricultural engineering at Zagazig University. There, he advanced to become a professor of irrigation and drainage engineering in 2019; he was also a senior scientist and research team leader with the International Center for Agricultural Research in the Dry Areas (CGIAR-ICARDA). Most recently, Swelam was the agricultural research officer of the U.N.-FAO's Office of Innovation in Rome.
Swelam explained that the mandate, function, mission and vision of UC ANR's research and extension network – and its strong reputation for making an impact through co-creation with clientele – attracted him to this position in California.
“I'm always looking to make a difference on the ground and in the lives of people,” he said. “If you look at the locations where all RECs are located, they are inside the communities themselves, and in the heart of the farming system.”
Swinging between Kearney and West Side RECs, Swelam said he feels he works in an empowering environment, created and supported by the leadership as well as by the staff at both centers – “a dynamic is which hard to find elsewhere.”
Darren Haver, recently named director of the statewide system of RECs, said he will work with Swelam to explore ways to secure the resources that the Kearney and West Side teams need.
“Atef brings a wealth of experience in conducting research as well as working to elevate and amplify the research and outreach of others,” said Haver, formerly the director of South Coast REC in Irvine. “He clearly is committed to making a difference locally, nationally and globally and we are excited to support him as his vision for these two RECs evolves.”
Being a farmer and a scientist, Swelam feels he is on the same wavelength with both of the RECs' clientele groups – researchers and growers. In his first months on the job, Swelam said he will get to know the needs of the grower community and the researchers at the RECs.
“What I like most about this job is that the REC system, with its research for development approach, supports the scientists, who are in turn supporting the farmers and communities that are on the front line in achieving food and nutrition security,” he explained.
When tailoring solutions to meet local conditions, Swelam added that it's essential that community members are involved so they feel a sense of ownership and are committed to sustaining its impact beyond the time limits of a research or extension project.
Innovative irrigation technique used worldwide
A prominent example of Swelam's community-based work is his long-term mechanized raised-bed (MRB) irrigation program, the technology for which he has garnered numerous international honors.
While he was a researcher at the CGIAR-ICARDA, Swelam led several projects between 2010 and 2020 to study new soil and water practices at farm level. Through a project at his home village, he developed a cost-effective, small-scale machine to enable growing wheat on raised beds. This was in contrast to flat flooded land – the traditional, labor- and resource-intensive method that produced irrigation inefficiencies and caused shortages for downstream farmers like his father, Haj Ibrahim.
With MRB, precisely placed trenches between the raised beds would hold exactly the amount of water the adjacent crops need and thus leave more water for all. And while the technique seemed promising, Swelam had to convince skeptical farmers to adopt the practices – including his neighbors and his own father.
“He was very resistant to me in the beginning, because this was the first time ever in Egypt using raised beds for wheat cultivation…he even tried to convince people not to follow me,” Swelam said, with a chuckle.
So father and son divided their fields, with one half planted and irrigated using traditional methods, and the other using the raised-bed approach. Gradually, as MRB began to prove its worth, Haj Ibrahim warmed to the technology and became an active collaborator on the research – even helping the scientist when he was puzzled by experiment results.
“My father was my mobile library,” Swelam said. “He was illiterate – he had never been in a school – but his thinking and knowledge about the real agriculture and farming system were much better than those of a professor like me!”
After the initial research trials produced successes in his village and the larger governorate (a political division within Egypt), the technique was replicated in other governorates across the country – which then attracted the attention of other nations and international organizations.
Overall, Swelam said, the technology helped the growers reduce applied water by 25% and cut farming costs by 25%, while boosting fertilizer use efficiency by 30% and increasing yield by 25%.
Today, MRB is applied by more than 2 million farmers in the Middle East and North Africa to a variety of crops and is recognized as a good agricultural practice by the U.N. Food and Agriculture Organization.
“The biggest recognition and reward for me out of this impactful innovation is seeing the smiles on the faces of farmers,” Swelam said.
Spreading best practices across San Joaquin Valley and beyond
Swelam said he hopes to see similarly positive results for farmers here in California with a wide range of innovations. He and other researchers at Kearney and West Side RECs will continue to make sure that the science and knowledge generated at the centers reach farmers. He added that partnering with local growers to optimize their on-farm practices is crucial on a host of issues, from pest management to water conservation.
“Whatever we do to improve supply management at system level, if the water is not used efficiently at farm level, then we lose everything we had achieved at that macro level,” he explained.
Swelam added that investing intensive time and effort in developing practical, cost-effective solutions will pay off in the long run as they become naturally adopted across the grower community.
“Farmers are very clever and skilled with their farming systems,” he said. “When they see or get benefits from something, they promote it among themselves.”
Swelam's father was one example. After leading the resistance against mechanized raised beds initially, he eventually became its most vocal proponent.
“He became the biggest promoter for this technology; he even promoted it on local and international TV and radio programs,” Swelam said. “I was proud of my father.”
Haj Ibrahim died in 2017 and Swelam continues to pay tribute to his father through his life's work on research and extension – inspired by their long struggles to bring water to their crops, and the shared triumph of their new techniques.
/h3>/h3>/h3>/h3>New avocado proves tasty, safer to harvest at UC ANR Research and Extension Centers
A new avocado, one that complements the widely known ‘Hass,' will hit the world market soon. The ‘Luna UCR' variety (trademarked and patent pending) has several characteristics that should be of interest to both growers and consumers, said Mary Lu Arpaia, University of California Cooperative Extension subtropical horticulture specialist based at UC Riverside.
From the grower perspective, the tree is about half the size of the leading variety while producing approximately the same yield per tree as ‘Hass,' meaning that growers could plant more trees per acre, therefore increasing yield. It also makes harvesting easier and safer.
Another advantage is the flowering behavior of the tree. Avocado trees are categorized into either Type A or Type B flower types. It is generally accepted that you need both flower types in a planting to maximize productivity. The ‘Hass' is an “A” flower type and ‘Luna UCR' is a Type “B.”
This is a potential boost for growers since the current varieties that are “B” flower types ripen green and generally receive lower prices for the grower. Similar to ‘Hass,' however, the ‘Luna UCR' colors as it ripens.
“Hopefully, it will receive similar returns to the ‘Hass' once it is an established variety,” Arpaia added.
Fruit breeding is a long-term process that she has navigated by building upon the work of her predecessors. Of course, Arpaia has had strong support from colleagues as well, including Eric Focht, a UC Riverside staff researcher and co-inventor of ‘Luna UCR.'
“We had been looking at ‘Luna UCR' for some time and it was always a very good eating fruit,” Focht said. “After the 2003 release of ‘GEM' (registered and patented as ‘3-29-5', 2003) and ‘Harvest' (patented as ‘N4(-)5', 2003) varieties, ‘Luna UCR' was always the top contender for a next release due to the small, narrow growth habit, “B” flower type and the fruit quality.”
“It's a very nice-looking fruit as well and seemed to be a pretty consistent bearer from year to year.”
A glimpse at how it all started
In spring 1996, Arpaia took over the UC Avocado Breeding Program following Guy Witney who led the program from 1992 to 1995, and Bob Bergh whose initial efforts in the 1950s were foundational in the inception of ‘Luna UCR.'
Arpaia recalls the first trials in the early 2000s of ‘Luna UCR,' which were tested alongside other promising selections from the Bergh program. “There were a lot of varieties that didn't perform well, some of which had poor storage life, an important trait that we need if we are going to get the fruit to consumers across the country,” said Arpaia.
The original seed and selection were planted at the Bob Lamb Ranch in Camarillo, and originally advanced trials of the ‘Luna UCR' variety were planted in four locations: UC Lindcove Research and Extension Center in Tulare County, UC South Coast Research and Extension Center in Orange County, a privately owned farm in San Diego County and another one in Ventura County.
The RECs are among the nine hubs operated by UC Agriculture and Natural Resources to support research and educate the public on regional agricultural and natural resource challenges.
ANR Research and Extension Centers become vital
Unfortunately, the 2017 Thomas Fire burned the avocado trees in Ventura, said Arpaia. After a change in management, the trial located in San Diego County was also terminated, leaving the two trials at Lindcove and South Coast REC.
“South Coast REC has a long history of supporting research and extension activities of high value crops important to California, including avocados,” said Darren Haver, director of the South Coast REC, which was often used to show growers the new varieties that were being developed.
“Many of the REC staff have worked with the avocado-breeding program researchers for more than two decades and continue to work closely with them to ensure the success of new avocado varieties, including ‘Luna UCR',” he added.
In addition to the support provided by South Coast and Lindcove RECs, Arpaia said that UC Kearney Agricultural Research and Extension Center in Fresno County – another UC ANR facility – made it possible for her team to conduct critical postharvest and sensory research, and consumer testing of the fruit, which included up to six-week trials of fruit ratings for storage life and taste.
“UC ANR has played an important role in our ability to not only identify ‘Luna UCR', but in preparing it for the world market, too,” she said.
Preparing to share with the world
Since 2015, Focht had been collecting data for the patent application. Now that he and Arpaia have successfully patented and trademarked ‘Luna UCR,' they are preparing to expand production by engaging interested growers with the commercial partner, Green Motion who is based in Spain.
“Green Motion contracted for 1,000 trees to be generated by Brokaw Nursery and those trees are currently being distributed, with earliest field plantings likely taking place in fall,” explained Focht.
Focht also said that Mission Produce, based in Oxnard, CA has contracted to graft over a small number of “B” flower type pollinizer trees to the new ‘Luna UCR' variety, possibly making way for a small number of avocados to be available the following year.
Once planted, the avocado trees will come into “full” production in about five years.
To read this story in Spanish, visit: https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=58991
El Hopland REC convierte la devastación del incendio forestal River de 2018 en una oportunidad de investigación
El Hopland REC convierte la devastación del incendio forestal River de 2018 en una oportunidad de investigación
La destrucción causada por el incendio forestal se observa fácilmente, pero los peligros pueden esconderse bajo las cenizas. Un grupo de científicos de UC Davis estudió muestras de carne y lana de corderos en el Centro de Investigación y Extensión Hopland de UC, para determinar si los pastizales que rebrotan tras un incendio forestal causan residuos tóxicos en los animales de pastoreo. Los resultados, publicados en el diario California Agriculture, mostraron que pastar en dichos pastizales no alteró significativamente el contenido de metales en la carne y la lana de los corderos. Esa es una buena noticia para los rancheros y consumidores desde la perspectiva de seguridad alimentaria.
En el 2018, el incendio forestal River ardió seis millas al norte de Hopland, arrasando con dos terceras partes de las tierras del Hopland REC, incluyendo áreas en su estación de corderos. Debido a que el Hopland REC conduce investigaciones ecológicas y agrícolas, tenían información y algunas muestras del rebaño de corderos que vivió en el lugar antes del incendio River.
“Un grupo de investigadores se reunió para intercambiar ideas sobre cómo podíamos tomar ventaja de este lamentable evento”, señaló Sarah Depenbrock, profesora asistente y agrónoma en el Departamento de Medicina y Epidemiologia de la Facultad de Veterinaria de UC Davis.
Las quemas controladas han jugado un papel importante en el proceso agrícola durante muchos años, pero los incendios forestales de California están creando un nuevo paisaje que interesa a investigadores como Depenbrock. “El problema, ahora, es que los grandes incendios forestales probablemente interactúan con tierras agrícolas de manera diferente que las quemas de rutina”, manifestó la experta.
Las plantas grandes y viejas en los terrenos que no han sido quemados recientemente pueden contener altas concentraciones de metales, capturado durante sus años de desarrollo. El mercurio, por ejemplo, es un metal potencialmente peligroso que con el tiempo puede ser capturado en objetos vivientes. Estos metales pueden ser distribuidos a través de la ceniza cuanto se quema la vegetación, por lo que los científicos examinaron corderos que habían pastado en los pastizales del Hopland REC durante el primer rebrote, después de haberse quemado.
Los resultados inciertos plantean más preguntas
Los investigadores compararon carne de los corderos que pastaron en los pastizales que rebrotaron en el 2019, después del incendio River, con muestras de carne congelada que se había obtenido el año anterior al incendio. En ninguna de las muestras se detectaron rastros de plomo, mercurio, arsénico, molibdeno, cadmio, berilio, cobalto y níquel. Sin embargo, sí hubo algunas muestras (tres de 26), que dieron positivo a los no esenciales (metales pesados potencialmente tóxicos) cromo y talio en el grupo que pastó después del incendio.
Debido al reducido número de muestras que dieron positivo, los investigadores no pudieron determinar estadísticamente si esta contaminación estaba asociada con los pastizales de rebrote. Las concentraciones de cromo y talio detectadas pueden ser o no potencialmente tóxicas, dependiendo de las formas y cantidad específicas de carne que una persona consuma.
Otro aspecto del estudio incluyó el análisis de la lana de los borregos para determinar si es un buen método para medir el contenido de metales en su carne. “En general, nos dimos cuenta que no estaba bien correlacionado con la mayor parte del contenido de metales de interés, lo cual vale la pena saber. Sin embargo, debido a que no identificamos en ninguna muestra animal muchos de los metales no esenciales de particular preocupación toxicológica, como el plomo y mercurio, no pudimos determinar si el análisis de la lana puede ser útil para determinar la presencia de esos metales, como ocurre en otras especies”, dijo Depenbrocké quien agregó que la lana de los animales cuya carne dio positivo al cromo y talio, no dio positivo a estos metales.
Mientras los retos en el control de los incendios forestales persisten, lo mismo sucede con el riesgo de contaminación de los productos alimentarios derivados del ganado de pastoreo.
“No obtuvimos pruebas contundentes que nos dijeran que, cuando hay un incendio, eso significa que todo se contamina con metales pesados”, manifestó Depenbrock. “Pero si se plantea la cuestión de que quizás deberíamos realizar un poco de vigilancia para ver si esto es algo esporádico o común. Y deberíamos de encontrar la manera de cribar los rebaños”.
Recomendaciones para manejar los problemas del cobre
“Es un estudio muy pequeño, pero fue interesante conocer que el contenido de cobre fue realmente bajo en el grupo que pastó después del incendio, lo cual me hace pensar”, expresó Depenbrock.
Las enfermedades asociadas con la deficiencia de cobre es una preocupación importante en los borregos. Por ejemplo, el swayback o lomo hundido puede resultar en la muerte antes de nacer o en la incapacidad del animal de pararse por sí solo debido a los cambios incurables de la espina dorsal. Otros efectos adversos incluyen una tasa reducida de nacimientos, anemia, defectos en la lana y decoloración de la fibra y osteoporosis con un alto riesgo de fracturas espontaneas. El exceso de cobre puede también causar enfermedades graves y a veces mortales.
Muchas de las fuentes de forraje y áreas de pastizales en California tienen una deficiencia de cobre, mientras que otras fuentes de alimentación tienen un exceso de cobre. Es crucial que se monitoree a los rebaños para determinar sus niveles de minerales incluyendo el cobre.
En cuanto a las pruebas de cobre, la experta aconseja a los ganaderos que obtengan las concentraciones de minerales de los órganos de los animales que son sacrificados o mueren. Las muestras del hígado y riñones son las más valiosas para identificar un potencial problema en el rebaño. Los laboratorios de UC Davis Veterinary Medicine's California Animal Health and Food Safety (CAHFS, por sus siglas en inglés), llevan a cabo estas pruebas de manera rutinaria.
En segundo lugar, monitorear y registrar la suplementación de minerales y tercero, mantener un registro de salud actualizado para tomar decisiones informadas respecto a la suplementación basada en los problemas conocidos del rebaño. Por ejemplo, si un productor no está acostumbrado a suplementar con cobre, Depenbrock recomienda mucho que trabajen con un veterinario para empezar a hacerlo (ya que hay numerosos suplementos de cobre de concentración variada en el mercado), para determinar un plan de pruebas o examinación y revisar el historial de salud para detectar problemas que estén potencialmente asociados con el cobre.
Para leer el texto completo del estudio, visite https://calag.ucanr.edu/Archive/?article=ca.2022a0016.
Adaptado al español por Leticia Irigoyen del artículo en inglés
Editado para su publicación por Ricardo Vela
Winter atmospheric rivers gave pathogens, diseases path to infect crops
Outbreaks similar to El Niño-influenced issues of the 1990s
The wave of atmospheric rivers that swept across the state this winter has created the right conditions for plant pathogens that haven't been seen for decades in California. University of California, Davis, plant pathologist Florent “Flo” Trouillas is getting more calls from growers and farm advisors concerned about potential crop damage.
“Generally, whenever you have rain events, you're going to have problems,” said Trouillas, a Cooperative Extension specialist who is based at the Kearney Agricultural Research and Extension Center in Parlier. “In wet years we get really busy because most pathogens need and like water.”
Trouillas is like a disease detective. He splits his time between the field and the lab, working to diagnose pathogens, diseases and other ailments that strike fruit and nut crops such as almonds, cherries, olives and pistachios.
On a recent visit to an almond orchard near Fresno, Trouillas joined Mae Culumber, a nut crops farm advisor for UC Cooperative Extension Fresno County. A few weeks earlier, the two had walked the orchard, taking note of the base of some trees that had gumming — a thick, jelly-looking substance indicating a pathogen had taken hold.
“A lot of what Florent is doing is trying to assess patterns on a landscape,” Culumber said. “Sometimes things may look like they are one thing, but it could be another problem.”
When the two returned weeks later, the amber-colored gumming had moved into the canopy, looking like gumballs stuck to branches, some of which were already dead. “It's getting out of control from before,” Trouillas says. “This branch was killed. This is widespread.”
From the field to the lab
Lab testing confirmed what Trouillas believed was the culprit: Phytophthora syringae, a pathogen that can affect almond crops but is rarely seen in California. If it is found, generally the site of infection are wounds caused by pruning, but that is not the case here, where the infection began in the canopy at twigs, or small branches.
It is a threat to a key crop, which according to the California Department of Food and Agriculture, generates $5 billion annually. The last time Phytophthora syringae hit California was in the 1990s after a series of El Niño-influenced storms. Trouillas, who has a photographic memory, remembered reading about it in an old manual.
“It's rare for California and one that we see mostly following atmospheric rivers,” he says.
“The disease will only happen following these extremely wet winters.”
Phytophthora is soilborne, mostly found in tree roots, and doesn't generally spread up into branches. But the intense storms created the right conditions for the pathogen to “swim” up trunks as winds blew spores into the air and rain dropped them back down into the canopy, Trouillas said.
Some of the trees in this orchard will die; others can be saved by pruning infected branches and applying a recommended fungicide, he said.
Identification, diagnosis, education
Trouillas is one of more than 50 Cooperative Extension specialists at UC Davis and each is charged with identifying problems and developing solutions for those issues in support of agriculture, the ecosystem and communities throughout the state.
In his role, Trouillas focuses not only on pathology and research but also on educating growers, nursery staff, pest control advisers and others in agriculture about ways to manage potential threats and how to prevent crop damage.
“His role is very crucial,” said Mohammad Yaghmour, an orchard systems advisor for UC Cooperative Extension Kern County. “He's not only on this mission to educate growers but he's also a source of education for us.”
Trouillas typically conducts one or two site visits a week, usually after a farm advisor reaches out about a problem they can't solve on their own.
“This allows us to be at the forefront of disease detections in California,” he said.
He likens these visits to house calls a doctor would make, only to fields instead. And one of those calls recently took him to a cherry orchard in Lodi.
“These guys help me quite a bit,” said Andrew Vignolo, a pest control adviser with Wilbur-Ellis who asked for a consult. “I bug them a lot.”
The visit starts like any consult in a doctor's office, only the questions come fast as they walk around the Lodi orchard where branches are dying, there is gumming and the trees appear stressed. Some look to be sunburned from exposure. Old pruning wounds show cankers, indicating that past disease treatments didn't get rid of whatever was affecting the trees.
Trouillas asks about the cultivar of the trees because some varieties are more susceptible to pests or diseases. He focuses on stress because that opens the door to disease.
Do they prune in the dormant winter months or in summer when pathogens are more prevalent? Does the soil get tested? How old are the trees? What about nutrition?
“I'm trying to figure out how they got infected so bad,” Trouillas said, walking the orchard. “Bacterial canker is a very mysterious disease.”
He thinks it might be a bacterial canker disease and shaves some bark to take to the lab for testing. He wants to come back next winter to take some samples to see where the pathogen is overwintering.
“We'll know in a few weeks if we have a fighting chance,” Vignolo said.
Be it Lodi, Fresno or elsewhere in the state, Trouillas focuses on local conditions. But what is learned in one field can be passed on to others, providing early warnings or advice for those in similar situations. “All these efforts at collaboration, from the field, to the lab, going through research projects, there's only one goal here — to help the farmers of California.”
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