January 2021 Newsletter Archives - West Coast Nut

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January 2021 Newsletter



MyAgLife Episode 42: Planning for Spring Pest Management in Walnuts


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A Word from American Pistachio Growers: Update on Marketing in India


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Pre-Plant Steps to Reduce Nematode Infestation in Walnut


Given widespread nematode infestations of walnut orchards and limited control options, steps taken pre-plant are vital to the long-term success of an orchard, according to UC Riverside Nematology Specialist Andreas Westphal. Westphal said proper soil sampling, proper use of chemical treatments and good rootstock selection often are the most important steps a grower can take to ensure a walnut orchard gets off to a good start. Several nematode species are problematic in California walnut production, Westphal said, including first and foremost the walnut root lesion nematode. In previous discussions, Westphal has stated that approximately 85% of California walnut orchards are...

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High Density Planting to Increase Yield


Increasing almond orchard productivity and grower profits is the goal of a research project to redesign orchards using more intensive management systems and new varieties and rootstocks. In an Almond Board of California research update by Grant Thorp, a research scientist who has studied alternative growing systems for almonds in Australia, Thorp reports that orchard yields can be doubled through high-density plantings with minimal pruning to produce a slender, pyramid-shaped canopy that optimizes light interception. Currently, Thorp writes in his research, almond trees in production today produce large scaffold branches and large canopies that require pruning to maintain production. Current...

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Walnut Pathogens on the Rise


A survey of 43 walnut orchards in San Joaquin and Stanislaus counties produced significant findings about the canker and blight diseases caused by Botryosphaeria and Diaporthe (Phomopsis) spp fungi. These infections are increasing in walnut orchards across most California walnut growing regions, said UCCE farm advisor Mohamad Nouri. Environmental conditions, including extreme weather stresses and late dormant season rainfall, are factors in the spread of these infections in walnut orchards. Early signs of an infection include wilting and flagging leaves. Inside affected branches are discolored cortical and cambial tissues. An advanced infection will show black pycnidia of the Botryosphaeria and...

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