More Rain, More Fungi, More Use for Multiuse Fungicides

With More Rain, More Fungi, More Use for Multiuse Fungicides

By Patrick Cavanaugh, Deputy Editor

With spring rains, many vegetables, tree fruits, grapes and nuts succumb to fungi pressure. However, during the past few years, only trivial amounts of spring rain have moistened California’s soil and lulled farmers to abandon their vigilant watch for fungi proliferation. But now, the strong likelihood of El niño-driven wet weather this spring could catch growers off-guard.

“We have an El niño coming that has already been tagged, ‘Too big to fail,’ which will bring a lot of rain. So it’s really important for folks to think about switching gears this year on their pest management mindset. With more rain, comes more fungi disease. We always see really high pressure disease years with rain,” said Kate Walker a technical services representative with BASF Corporation on the Central Coast, who advises use of a multiuse fungicide product already on hand.

Anthracnose in Strawberries, UC Statewide IPM Project

Anthracnose in Strawberries (Source: UC Statewide IPM Project

Strawberries, in particular, are vulverable to fungi. “We have heard from our strawberry growers,” said Walker, “that these fungal diseases are always present in California, but they vary significantly in their severity year-to-year depending on the weather,” noted Walker.

“One major disease that accompanies higher moisture, Anthracnose, often called leaf, shoot, or twig blight,” Walker explained, “results from infection caused by the fungus Colletotrichum. I’ve heard some growers have not experienced Anthracnose issues in 10 years,” said Walker. “As it emerges and becomes more problematic in strawberries, farmers really need to know which types of fungicides to use to manage this and other diseases.”

“It is very important for farmers and PCAs to walk through and scout their fields for disease,” Walker said, “and when they identify one, to become very aggressive with their fungicide management program. So, as representatives for BASF, we are lucky to have multiuse fungicide products available to control these diseases, such as Merivon Fungicide.”

Walker noted Merivon has two modes of action, “so it is very broad-spectrum. Typically we position Merivon in California for use on powdery mildew and Botrytis, but what we seldom talk to growers about is its utility for Anthracnose. We see a lot more Anthracnose in Florida and on the East Coast due to the increased rains; whereas, it usually doesn’t come through every year in California. So it is good to for farmers and PCSs to know that the product with which they are familiar for use in Botrytis, is also very effective with other issues, like Anthracnose.”

Walker offered, “Another very common disease that flourishes with increased rain, Rhizopus, occurs post-harvest, after the berries are picked up from the field. Again, Merivon has utility for Rhizopus as well, so growers don’t have to change or reinvent their program to manage these diseases.”

Walker said, “Rhizopus is an airborne bread mold. It is very common in the air and in the soil, so anytime a fruit or a nut is exposed to the spores blowing in the wind, it is vulnerable to infection with this disease.”

California Ag Today2016-05-31T19:27:02-07:00December 4th, 2015|

Avian Influenza Mapping Plan to Prevent CA Outbreaks

High Pathogenic Avian Influenza Mapping Plan (HPAI) to Prevent Outbreaks in California

By Patrick Cavanaugh, Deputy Editor

In 2014 and 2015, the outbreak of High Pathogenic Avian Influenza (HPAI) caused unprecedented damage to the mid-western commercial poultry industry, requiring the depopulation of 48 million birds, particularly turkeys and laying hens. There were isolated cases in last autumn in California as well. Migrating birds, generally considered to be the source of HPAI, move throughout the state in their flyways this time of year.

USDA Pacific Flyway Map

Maurice Pitesky, a UC Cooperative Extension population health & reproduction assistant specialist with an appointment in poultry health and food safety, emphasized the importance of the flyways, “These global flyways that waterfowl use to move north and south and back again every single year are like freeways. And in those freeway lanes, different birds interface with each other. So, we might have a Pacific flyway that covers California, but that Pacific flyway can interface with the East Asian and Australian flyway in the Northern Arctic. If you look at the genetics of the strains that were found in North America, especially in California, the genetics match some of the HPAI found in South Korea for example,” Pitesky said.

The Avian Influenza Mapping Plan is like overlaying maps of birds’ flying patterns for an early warning system for commercial operations. Pitesky observed, “We’re really just scratching the surface in how we can utilize maps with respect to surveillance and risk-mapping. For example, if I can locate on a map, where waterfowl, flooded rice fields, or wet fields are, and I can also determine where commercial poultry operations are, then I can start understanding which operations are at highest risk.”

I can triage my focus, outreach, and biosecurity efforts to those farms that are most closely located.

“New techniques are available so our national network of weather radar can actually be leveraged, and that data can be utilized remotely to understand in real time where waterfowl are hanging out. Eventually we can use that information to warn farmers in real time if there are migrating waterfowl near their farm,” he said.

California Ag Today2016-05-31T19:27:03-07:00November 18th, 2015|

Winegrape Rootstock Trials

Winegrape Rootstock Trials for Pest Resistance and Vine Productivity

By Patrick Cavanaugh, Deputy Editor

Larry Bettiga, a viticulture farm advisor with UC Cooperative Extension, Monterey County, is working with county growers on winegrape rootstock trials to increase vine productivity.

“Several things have happened,” noted Bettiga,“we are replanting vineyards on former vineyard lands, where a build-up of soil pests already exists. Farmers used to grow a lot of beans and tomatoes in the Valley, so we’ve had a lot of root-knot nematode populations from past cropping patterns.”

“We’ve recently seen ring nematode populations developing at multiple vineyard sites,” Bettiga continued. “With the loss of more effective fumigants, and then the loss of post-plant-type nematicides, the use of nematode-resistant roots is becoming more critical to the success of replanting these vineyards. We have hopes that Andy Walker, a UC Davis viticulture professor and grape breeder, is going to supply us with some better options than we currently have.”

“We have a site where we are comparing five new rootstocks that were released from UC Davis with a number of our standard rootstocks. We are just starting that work, so obviously we have to look at them for several years to get a good feel for how those stalks will fit in comparison to what we are now using,” he noted.

California Ag Today2016-05-31T19:27:05-07:00October 30th, 2015|

UC Davis Water Policy for Food Security

UC Davis Water Policy for Food Security Global Conference

By Laurie Greene, Editor

A Global Conference for Water Policy for Food Security was held at UC Davis earlier this week to focus on global ground water supplies. Many speakers came from around the world to talk about water supplies in their own countries.

The take-home message: Supplies are limited, but growers are being very efficient and groundwater recharge is a priority.

Josette Lewis, associate director of the World Food Center at UC Davis said, “When I joined UC Davis, it was very clear that water is something in which this campus has enormous technical expertise and has expertise to inform and engage in state water policy,” she said.

“We are working with everything from farmers to state agencies that manage water resources. Part of the vision of the World Food Center is, how do we expand that impact? How can UC Davis have an impact on national and international issues? How do we get more benefit for society from what we do? It became very obvious that leveraging the expertise we had here in California to an international discussion of issues made a lot of sense.”

Lewis noted that the conversations during the two-day conference were an exchange of ideas on groundwater sustainability, “I think the quality of the discussion over the last few days exceeded our expectations,” she said.

“We really brought in some of the world’s leading experts in these areas. From talking to the participants some of them are walking away with a new and energized way of thinking about how we can create solutions to address the sustainability of our water supply and ensure that we have water available for food production globally,” Lewis said.

World Food Center at the University of California, Davis

International Food Policy Research Institute

Join the conversation on Twitter at #WaterSecurity

California Ag Today2016-05-31T19:27:07-07:00October 8th, 2015|

Armyworms Invade Rice

Luis Espino: Armyworms Invade Rice

By Charmayne Hefley, Associate Editor

Larva of the armyworm, Mythimna unipuncta.
Photo by Jack Kelly Clark, UC IPM.

Farmers face many threats to their crops on a daily basis. Luis Espino, rice farm advisor UC ANR Cooperative Extension, Colusa County, said rice farmers are on the lookout for two caterpillar infestations during the year when armyworms invade rice fields. “The first one occurs sometime in June,” Espino said. “At that time all they do is just eat the foliage, and you can usually see it when you walk into a field. Nevertheless, the rice has a very good capacity to recover from that type of injury.” Espino’s UC Rice Blog explains it is difficult to accurately estimate yield losses due to early armyworm damage because it can reduce tillering, delay the crop, and cause uneven maturity.

“Heading” occurs when the rice plant prepares to enter its reproductive phase. The first sign, called the ‘booting’ stage, is when the leaf stem that conceals the developing panicle bulges. Then the tip of the developing panicle emerges from the stem and continues to grow. Rice is said to be at the ‘heading’ stage when the panicle is fully visible. Flowering begins a day after heading has completed. As the flowers open they shed their pollen on each other so that pollination can occur. Flowering can continue for about 7 days. (Source: Rice Development, Ricepedia.)

“The second infestation usually occurs in mid- to late-August when the rice is heading out,” Espino said. “At that time, armyworms can feed on the panicles, [causing the kernels to dry before filling], resulting in blanks [without kernels to harvest] on the panicles and broken panicle branches. That’s when armyworms are more important.”

Espino said that the first infestation this year was relatively large, making it harder for the treatments to control the armyworms as they devastated the rice fields. “There were some areas in fields where the rice was down to the waters,” Espino said. “so all the foliage was consumed, and sometimes only a little stem was left standing.”

During the second armyworm infestation, however, Espino said the rice fields were not as badly affected as they had been in the first attack. “We did see some fields with armyworm injury,” Espino said,“ and some farmers had to treat their fields. The numbers were just so big that the treatments were not controlling them.”

Resources:

UCANR/CA Rice Blog, “Estimating armyworm injury.”
Ricepedia

Patrick Cavanaugh2016-05-31T19:27:09-07:00September 30th, 2015|

Celery Management Research

Andre Biscaro on Celery Management Research to Improve Water and Nitrogen Use

By Charmayne Hefley, Associate Editor

Ongoing research continually improves the agriculture industry. Andre Biscaro, agriculture and environmental issues advisor at the University of California, Division of Agriculture and Natural Resources, Cooperative Extension, Los Angeles and Ventura Counties, described current trials in celery management research, sponsored by the California Celery Research Advisory Board.

“We’re monitoring water and nitrogen use based on best management practices,” Biscaro said. “We evaluate ‘best management’ practices using the soil nitrate quick test. That gives us a really good estimate of how much nitrogen is in the soil, and we can accomplish the test in just about an hour.” The trial also incorporates data from weather stations to calculate the amount of applied water.

“This trial and research actually monitors the amount of water and nitrogen we’re using and how much yield we’re getting under various best management scenarios,” Biscaro said, “and compares our practices to what the grower usually does.” Ultimately, the trial will help determine the yield of a celery field using best management practices, and how much water and nitrogen are required to achieve that yield.

Biscaro said the grower he has been working with to conduct the trial was already highly successful with soil and water management in the specific celery field under study. “He really knew what he was doing, and the nitrogen management was quite decent as well. So I believe there are opportunities for improvement in the industry, but the grower was actually doing quite well in this particular field I monitored.”

Patrick Cavanaugh2016-05-31T19:27:09-07:00September 25th, 2015|

Plants Do Not USE Water…They Borrow it!

Plants Transpire Most of the Water They Use!

Editor’s note: California Ag Today interviewed Allan Fulton, an Irrigation and Water Resources Advisor, UC Cooperative Extension Tehama County, in Redbluff CA, to comment on the debate about the agricultural industry’s use of water and to focus on a critical but disregarded process—that all plants transpire, even plants cultivated for the crops we eat.

Allan Fulton, Irrigation and Water Resources Advisor

CalAgToday: We hear in the media that our crops are using too much water. And while all plants need water to grow food, we also know that a high percentage of water taken up by all plants actually transpires back into the atmosphere, to form clouds and precipitation, right?

Fulton: Yes, when plants transpire, the water just returns to the local hydrologic cycle, leaving the harvested crop that we distribute elsewhere in the US or in the world actually very low in water content.

CalAgToday: When we think about transpiration, are the plants actually “borrowing” the water?

Fulton: Yes. We get a lot of questions about why we irrigate our crops so much, and it comes from the general public not being as close to farming everyday. The truth is, plant transpiration is a necessary biological process. The water cools the tree so it stays healthy and exits the leaves through special cells called stomata. While the stomates are open to allow water to transpire, carbon dioxide enters and is used in photosynthesis, making sugars and carbohydrates for the plant to create the fruits and nuts that we eat. So, an inadequately watered plant cannot take in enough carbon dioxide during transpiration, resulting in defective fruits and nuts that are smaller, shriveled, cracked—all the things the typical consumer does not want to buy.

Plants cannot gain carbon dioxide without simultaneously losing water vapor.[1]

CalAgToday: Can we say 95 or 99% of the water that is taken up by the plant gets transpired and definitely not wasted?

Fulton: Definitely. We converted to pressurized irrigation systems, micro sprinklers and mini sprinklers, so we have a lot more control over how much water we apply at any one time. We do not put water out in acre-feet or depths of 4-6 inches at a time anymore. So, much like when rainfall occurs, we can measure it in tenths, or 1 or 2 inches at most. As a result, the water doesn’t penetrate the soil very deeply, maybe only 1 or 2 feet each irrigation.

We are very efficient with the water, but because we deliver it in small doses, we have to irrigate very frequently. That is why we see irrigation systems running a lot, but they are systems that efficiently stretch our water supply and do not waste it.

CalAgToday: But again, the vast majority of the water that the tree is taking up is being transpired, right?

Fulton: Yes, most of the time, at least 90% of the water that we apply taken up through the tree and transpired so that photosynthesis can happen.

CalAgToday: And transpiration increases on a hot day?

Fulton: Yes, we do get a little bit of loss from surface evaporation from wet soil, but we try to control that with smaller wetting patterns—drip-confined wetting patterns. When you think about it, the heat of the day is in the afternoon when many irrigation systems don’t run because of higher energy costs. There are incentives not to pump in the middle of the afternoon, but those who do try to confine the wetted area to limit evaporation. And the hot hours of the day make up about 4 hours of a 24-hour cycle, so we irrigate mostly during the nighttime and early morning hours to lesson evaporative loss.

CalAgToday: Growers are doing everything they can to conserve water. If the trees and vines are all transpiring most of their irrigated water, why is using water to grow food a problm?

Fulton: I think the emphasis throughout the United States has always been to provide a secure food supply. That security has many benefits, economically and politically; and in the end, we are trying to provide the general public with good quality, safe food at the best price possible.

______________________________________________

[1] Debbie Swarthout and C.Michael Hogan. 2010. Stomata. Encyclopedia of Earth. National Council for Science and the Environment, Washington DC.

The California Irrigation Management Information System (CIMIS) is a program unit in the Water Use and Efficiency Branch, Division of Statewide Integrated Water Management, California Department of Water Resources (DWR) that manages a network of over 145 automated weather stations in California. CIMIS was developed in 1982 by DWR and the University of California, Davis (UC Davis). It was designed to assist irrigators in managing their water resources more efficiently. Efficient use of water resources benefits Californians by saving water, energy, and money.

The CIMIS user base has expanded over the years. Currently, there are over 40,000 registered CIMIS data users, including landscapers, local water agencies, fire fighters, air control board, pest control managers, university researchers, school teachers, students, construction engineers, consultants, hydrologists, government agencies, utilities, lawyers, weather agencies, and many more.

California Ag Today2021-07-23T14:31:38-07:00September 23rd, 2015|

New UC IPM Program Director

Jim Farrar Named Director of UC Statewide IPM Management Program

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

Jim Farrar has been named director of the Statewide Integrated Pest Management Program for the University of California’s Division of Agriculture and Natural Resources. He will begin as new uc ipm program director on Oct. 1.

UC IPM works with growers and residents to protect human health and the environment by reducing risks caused by pests and pest management practices.

Farrar is currently director of the Western IPM Center, where he has served since 2013. He succeeds Kassim Al-Khatib, UC IPM director since 2009, who is transitioning to a UC Cooperative Extension specialist position located in the Department of Plant Sciences at UC Davis. There Al-Khatib will focus on his research in weed management.

“UC IPM is a widely recognized national leader in integrated pest management,” Farrar said. “I am excited to continue efforts to make IPM the standard practice for managing pests in agriculture, communities and natural areas in California.”

Prior to joining the Western IPM Center, Farrar was a professor of plant pathology in the Department of Plant Science at California State University, Fresno for 12 years.

At Fresno State, Farrar received three teaching awards. He taught courses in plant pathology, plant nematology, diagnosis and control of plant diseases, crop improvement, aspects of crop productivity, mycology, sustainable agriculture and advanced pest management. His research centered on fungal diseases of vegetable crops, including management strategies for cavity spot of carrot. During his Fresno State tenure, he served four years as chair of the Department of Plant Science and a year as interim chair of the Department of Food Science and Nutrition.

From 1995 to 1997, Farrar taught in the Botany Department at Weber State University in Ogden, Utah. At Weber State, he conducted research on rock cress plants infected with a rust fungus that causes false-flowers. This rust is closely related to a species that is a potential biological control agent for dyer’s woad (Isatis tinctoris), an invasive weed.

Farrar has published scientific papers, extension newsletter articles, and articles in agricultural industry magazines. He also wrote a chapter in the book Tomato Health Management and five disease descriptions in the book Compendium of Umbelliferous Crop Diseases. He recently completed a three-year term as senior editor for feature articles in the journal Plant Disease and was senior editor for the online journal Plant Health Progress for three years. Farrar is a member of the American Phytopathological Society and the Pacific Division of the American Phytopathological Society.

The Wisconsin native completed his Ph.D. in botany and B.S. in plant pathology at the University of Wisconsin, Madison, and his M.S. in plant pathology at UC Davis.

California Ag Today2016-05-31T19:28:05-07:00September 10th, 2015|

No-tillage Grows in California

The list of crops that have been successfully grown using no-tillage in California continues to increase with garbanzo beans being the latest addition, according to Jeffrey P. Mitchell, CE cropping systems specialist, University of California, Division of Agriculture and Natural Resources.

Harvest data from the Conservation Tillage Workgroup are now in for a 2015 garbanzo crop that was no-till seeded in January in the longstanding conservation agriculture systems study field in Five Points, CA, and these data indicate no difference in yield between the no-till with and without cover crop treatments and the standard till with and without cover crop systems. Garbanzo yields for the four systems averaged about 3,600 lbs / acre with no statistical differences seen between the four experimental treatments.

Other than an herbicide spraying in the fall of 2014 to knock down weeds, the no-tillage systems relied on zero tillage prior to seeding that was done with a John Deere 1730 6-row 30” planter. Conventional tillage consisting of several passes of a Wilcox Performer bed-shaping tillage implement was done to prepare planting beds in the standard tillage plots as would be commonly done in the region.

There is now a growing list of several crops, including processing tomatoes, cotton and dairy forage that have been successfully produced, both in research studies and on California farms, with economically viable yields using no-tillage seeding.

Additional information about this study is available at the Conservation Agriculture Systems Innovation Center (CASI) website and by contacting Jeff Mitchell at jpmitchell@ucdavis.edu.

Established in 1998, the Conservation Cropping Systems Workgroup is a diverse group of more than 1,500 farmer, University of California, California State University, USDA – NRCS, Resource Conservation District, public agency, private sector and environmental group members that have come together to promote conservation cropping systems in California.

Featured Photo Soure: Source: CASI (Conservation Agriculture Systems Innovation) Center, University of California, Division of Agriculture and Natural Resources

California Ag Today2016-05-31T19:28:05-07:00September 2nd, 2015|

Bountiful Plant Transpiration

Guy Kyser on Plant Transpiration, Phytoremediation

By Patrick Cavanaugh, Deputy Editor

When plants get irrigated, not only do they provide food, but all plants transpire. Guy Kyser, a specialist at the UC Davis Plant Sciences Department, explained how plant transpiration transforms carbon dioxide into “food” for plants to grow.

“Water in the shallow soil is either going to evaporate, or it’s going to be transpired,” Kyser said, “which means it’s going to pass through a plant from the soil to the atmosphere. The transpiration process helps the plant fix CO₂ and convert it into food or plant material. The plant is really a little solar powered machine that catches CO₂ out of the atmosphere and turns it into something solid so it’s not a greenhouse gas anymore.”

Kyser also explained the phytoremediation* process that occurs in plants grown in less-than-ideal soil and water conditions, in which these plants take up polluted water from its roots while removing impurities from the soil, retain the impurities, and release pure water into the atmosphere. Kyser said, “So, with phytoremediation, you can use the plants to purify poor soil or water situations, then mow off the plant material when the process is done. All the toxins stay in the plant, and only the pure water goes through.” Despite being a slow process, phytoremediation is effective in toxin removal, environmentally friendly, and does not harm soil health.

*Phytoremediation: Ancient Greek for “plant” and Latin for “restoring balance”

California Ag Today2016-05-31T19:28:07-07:00August 13th, 2015|