Walnuts Archives - Page 3 of 9 - West Coast Nut



Let the Tree Dictate When to Start Irrigating

There are many available techniques for scheduling irrigation in walnuts during the season, says Ken Shackel, Professor in the Department of Plant Sciences at UC Davis. These schedules are based on weather, soil measurements, plant measurements and “WYND - What your neighbor does.” “But, how do you know when to start irrigating,” he asks. The most proposed method of late for scheduling irrigation is Evapo-Transpiration (ET). But newer research suggests there may be better alternatives for determining when to start. He explains that growers worry about two things--starting too late, and starting too early. “Growers worry that if they wait...

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Organic Walnuts

Quality organically grown walnuts are not produced with neglect but with careful planning and management. Rachel Elkins, UCCE pomology advisor for Lake and Mendocino Counties, where a large percentage of California’s organically grown walnuts are produced, said “growers need to farm their trees”, understand the need for long term planning for successful organic walnut production and to communicate with their certifier. Costs for inputs in organic walnut production, Elkins added, may be higher than in conventional production, but the market has been stable, allowing production to continue. Planting the Chandler variety has been another positive aspect of the organic market...

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Walnut Pest Management: Walnut Husk Fly & Pacific Flatheaded Borer

It seems that growers are always battling pests in order to protect their crops. While we looked into navel orangeworm and codling moth in the first part of this two-part series, this second part shines the light on walnut husk fly and the Pacific flatheaded borer. So just how concerned should a walnut grower be about these pests? They don’t require equal interest, as one is more of a concern than the other. Walnut Husk Fly About the size of a housefly, and far more colorful, the walnut husk fly has one generation per year, in which female flies lay...

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Increasing Evidence of Pacific Flatheaded Borer Attack in Walnut Orchards in California

Background and Pest Status Flatheaded borer is a larval stage of one specialized group of beetles (Insect family-Buprestidae), which are glossy iridescent colors. The name ‘flatheaded’ comes from the enlarged and flattened shape just behind the head of the larval stage (Fig. 1) of the beetle (Fig. 2), and the flatheaded borer species that has become a major issue in walnuts is Pacific flatheaded borer (PFB), Chrysobothris mali, which is known to present in the western states such as Washington, Utah, Oregon, California. A similar type of borer species causing serious damage in various nurseries and other fruit and trees...

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FSMA Produce Safety Inspections: What to Expect

The Food Safety Modernization Act (FSMA) was passed in 2011 to help prevent foodborne illness outbreaks. Under the FSMA rules are the Preventive Controls Rule (PCR) which covers processors/handlers and the Produce Safety Rule (PSR) which covers farms. The PSR is being implemented in stages between 2019 and 2021 depending on farm size. In California, Food and Drug Administration (FDA) is contracting with the California Department of Food and Agriculture (CDFA) to conduct the on-farm inspections to verify FSMA compliance. CDFA has created the Produce Safety Program (PSP) to educate and assist growers in complying with PSR requirements. Impact on...

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