Walnuts Archives - Page 4 of 6 - West Coast Nut

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Walnuts



Mating Disruption: A Crucial Tool for Nut Growers

By Kathy Coatney Editor

Mating disruption for navel orangeworm (NOW) has been widely tested throughout California with numerous research studies, and peer-reviewed research has demonstrated its efficacy. Mating disruption is a very simple process. Females emit pheromones, males use those pheromones to find the female. If an orchard is flooded with artificially produced pheromone the entire orchard smells like a female and the males struggle to find the real females. If they don’t find each other, they don’t mate, and if they don’t mate there are no eggs, no larvae, and less overall nut damage.   Mating Disruption in Almonds and Pistachios Navel orangeworm is a major and costly pest of almonds and pistachios for growers and processors. Currently, growers use winter sanitation and chemical sprays for control, but mating disruption is another important tool at their disposal. How mating disruption works is dispensers contain an artificial pheromone. They are placed in the orchard...

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Managing and Controlling Canker Diseases in Almonds and Walnuts

By Cecilia Parsons Associate Editor

Options to control Botryospaeria (BOT) diseases in tree nut crops include good sanitation and cultural practices to reduce the amount of inoculum in the orchard. University of California plant pathologist Themis Michallides covered the range of BOT diseases that affect walnut, pistachio and almond trees and how growers can reduce infection at the South Valley Nut Conference in Tulare.   Panicle and Shoot Blight of Pistachio Panicle and Shoot Blight of pistachio was discovered in 1984 in a commercial orchard in northern California and has become a disease of major importance. Buds infected by B. dothidea either will not emerge or will emerge, but the flower or shoot eventually dies. Symptoms of the infection are dark lesions at the base of shoots, rachises and mid ribs of leaves. Later in the growing season, brown, blighted shoots and leaves are easily seen among healthy foliage. Buds are highly susceptible to infection...

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fsma preventative control for the nut industry

FSMA: Preventative Controls for the Nut Industry

By Safe Food Alliance, Contributing Writer

For our second installment in this series on the Food and Drug Administration’s (FDA) Food Safety Modernization Act (FSMA) series, we’re going to talk about the “Preventive Controls” rule, which is the main rule for food processors. It’s similar to the Hazard and Analysis Critical Control Point (HACCP), with some notable differences which we’ll address below, including some specific requirements that you may not have seen before. Who’s Covered In general, facilities which register with FDA under part 415 of the FD&C act (that is, food processors) have to comply with the rule, unless specifically given an exemption. There are a few available exemptions based on specific food industry sectors such as meat processors or alcoholic beverage companies, which already have other regulations in place, but there are no specific exemptions for the nut industry. But there are some modified requirements for certain situations such as a very small company...

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Nutrition

What Walnut Growers Need to Know About Nutrition

By Cecilia Parsons, Associate Editor

Because of looming state regulations meant to protect ground water sources from nitrate contamination, California growers are being asked to re-examine how the amount of nitrogen (N) they apply compares with the amount they remove from their fields. Walnut growers are no exception. In order to use this nutrient more efficiently, growers and orchard managers may need to recalculate their application rates. Cost of over application is also a concern for growers. Ongoing research by University of California (UC) and University of California Cooperative Extension (UCCE) farm advisors, funded by the California Department of Food and Agriculture (CDFA) and the California Walnut Research Board, aims to more closely quantify the timing and scale of nutrient needs on typical soils to produce high yields. California walnut producers need to apply the nitrogen portion of their nutrients efficiently to reduce nitrate leaching below the root zone, and make sure their trees receive...

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Key Points to Ethephon Use in Walnuts

Key Points to Ethephon Use in Walnuts

By Cecilia Parsons, Associate Editor

Use of the plant growth regulator ethephon can be an important management tool for walnut growers who want to maximize kernel quality and minimize navel orangeworm (NOW) damage.   California walnut growers are also using ethephon to better manage their harvest timing said Dani Lightle, University of California Cooperative Extension (UCCE) orchard systems advisor based in Glenn County.   Ethephon Ethephon has a long history of usage since its discovery almost 50 years ago and Environmental Protection Agency (EPA) registration in 1973. It is one of the most widely utilized plant growth regulators in the world. Besides use in walnuts to speed up hull split, it is used for ripening pineapples and tomatoes and in hybrid seed production. When taken up by a plant it is converted to ethylene, a gas that is responsible for changes in texture, softening, color, and other processes involved in ripening.   In walnuts, according...

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