Posts Tagged: Surendra Dara
UC Cooperative Extension plays an active and ongoing role in the effort to increase agricultural sustainability and minimize the industry's environmental impact, a role that was showcased at the third Ag Innovations Conference in March. Held in Santa Maria, the event was centered on the potential for using biological solutions for the challenges faced in agricultural production – such as pest control and nutrient management.
Many organic growers are already using these products successfully. Conference organizer Surendra Dara, UCCE advisor in Santa Barbara and San Luis Obispo counties, believes increasing the use of biologicals in conventional agriculture, which represents a much larger part of the industry, holds promise for reducing the use of chemical pesticides, cutting back nitrogen inputs and sequestering carbon in healthy farmland soil.
The market for biologicals in agriculture is growing. Organic farming is increasing in acreage because of consumer demand for food grown without synthetic inputs. In the conventional sector, farmers are wary of the new biological projects, probably because of past experiences with “snake oil” products that made glowing claims, but came up short. They are looking for scientific research that confirms their effectiveness.
“The most important thing we can do is remove the stigma about efficacy,” Dara said. “Conventional options are inexpensive and they are generally perceived to work better. It is a hard thing to shake.”
Finding funding for research in biologicals is another obstacle.
“Much more funding is available to research in conventional practices,” Dara said. “It's challenging for us. We must rely on industry support.”
Dara has conducted multiple studies demonstrating the potential of biologicals in crop production. At the March conference, he shared the results of experiments in tomato, strawberry and grape production in which he compared products containing seaweed extracts, silicon and beneficial bacteria and fungi.
“Many of the treatments worked well,” Dara said. “We saw some improved yield and good pest control.”
Research results are a key for mainstreaming biologicals in the ag industry, said Bill Schwoerer a speaker at the conference who represents Concentric Ag in San Luis Obispo, a company that produces biological optimizers for soil, seed and plant vigor. Concentric and other companies that are marketing biologicals said expectations need to be managed.
“It's not a silver bullet,” he said. “It's a tool to help you farm and produce a better crop.”
Concentric's product is a unique metabolite brew that contains seven bacteria and three fungi.
“It mimics a healthy soil microbiome,” Schwoerer said. “It's important to note, with these products, we see more improvements under stress conditions. That's the nature of the product.”
Ashraf El-kereamy, the former UCCE viticulture advisor in Kern County who was recently promoted to UCCE specialist at the UC Lindcove Research and Extension Center, presented results of his first year of research on seaweed extract applications on Flame seedless and Allison grape varieties in Kern County.
The products are derived from wild and cultivated seaweed from oceans around the world. Their potential as agricultural inputs stem from seaweed's rapid cell division and growth, a function that is controlled by natural plant hormones.
“Increasing color on red seedless grapes is important for marketing,” El-kereamy said. “Growers in the southern San Joaquin Valley are having an issue with coloring. Some growers had to dry their red grapes to raisins or sell to the juice companies because stores didn't accept the crop without good color.”
The research results are preliminary. And more potential impacts of the seaweed products still need to be studied – such as the impact on vine growth and stress tolerance, and the impact of the compounds on grapes grown in other areas or in different varieties.
But El-kereamy is encouraged by the early findings. The increased value of the redder grapes more than offsets the cost of the seaweed treatment, he said.
Other speakers representing firms that produce biological compounds for the ag industry also shared information at the Ag Innovations Conference:
- Paul Zorner, chief executive officer of Locus Agricultural Solutions, said the products made by the company target the soil microbiome and focus on high-value horticultural crops. The company has found that their probiotic supports more robust, consistent root growth by creating better nutrient status and a better microbial environment.
- Drew Jackson, vice president of Cool Planet, shared information about biochar, a product made by burning organic matter in an oxygen-deprived environment. He said biochar has unique properties that lend themselves healthy soil biology. “It's like luxury condos for microbes,” Zorner said.
- Antonin van der Lely of Biobest USA is working to move biocontrols that are used successfully in the greenhouse industry into outdoor agriculture.
- Katherine Walker, a technical service representative for BASF, discussed a biological fungicide from the company that can suppress root and foliar fungus. The product, called Serifel, can be used along with a chemical fungicide for added protection and resistance management.
- Melissa O'Neal of Marrone Bio Innovations presented information about two new Marrone products, Stargus and Ennoble. These products can also be used to alternate with conventional products to prevent resistance, she said. Stargus is a liquid fungicide that can inhibit botrytis in grapes and strawberries, sclerotinia in lettuce and downy mildew in lettuce. Ennoble is a granular bio fumigant that is incorporated into the soil, where it releases volatiles into plants' rootzones.
- Deb Shatley of Terramera said the company is formulating a product with cold-pressed neem oil that mixes with water in an application tank and stays in solution for days. Neem is a tree native of India and other South Asian countries that is a natural miticide, fungicide, insecticide and nematicide. The Terramera product, called Rango, provides more consistent neem spray coverage in the field.
The strawberry industry ended a long good-bye to methyl bromide in 2016. The fumigant had been used for decades to kill a wide range of soil-borne pathogens, weed seeds and insects, permitting the California strawberry industry to flourish. Scientists determined it was an ozone-depleting chemical in 1991, but its phase-out was delayed for years because of lack of equally effective alternatives.
Strawberry farmers now use a combination of approaches, including fumigation with other chemicals, soil oxygen deprivation, biofumigants, and beneficial microbes that improve soil biology. A greater arsenal is needed.
“Growers have three or four chemical alternatives, some are used alone and others in various combinations,” said UC Cooperative Extension advisor Surendra Dara. “Now, certain minerals, beneficial microbes and biostimulants are becoming available to enhance plant's natural defenses and improve strawberry growth, yield and health in an era without methyl bromide.”
Dara conducts research and advises strawberry and vegetable growers in the Central Coast counties of San Luis Obispo and Santa Barbara. Each year he holds a field day that attracts nearly 200 farmers, pest control advisers and representatives of allied industries to Manzanita Berry Farms outside Santa Maria. The agenda for the May 9 event included preliminary results of trials studying a number of commercially available and soon-to-be available biological and synthetic amendments to improve strawberry plant health, berry quality and yield.
Dara was ill, so Manzanita Farm owner Dave Peck reviewed the handout prepared by Dara for the field day. Manzanita Farms is one of two sites where Dara is testing products in replicated plots. Other studies are conducted in strawberries grown at the Shafter Research Station, a privately managed agricultural research facility in Kern County.
Several products resulted in increased marketable yield of strawberries during the February 2018 to April 2018 study period. See the preliminary results here. Data collection will continue through the end of the strawberry season.
“A challenge was that many people did not have complete faith in biologicals a few years ago,” Dara said. “By conducting multiple studies year after year, we are able to generate critical data that is useful for the farmers as well as companies that produce biologicals. By using different application strategies and rates, and a combination of techniques - as appropriate for their situations - farmers can engage in sustainable strawberry production.”