August Mid 2021 Newsletter Archives - West Coast Nut


August Mid 2021 Newsletter

Avoid Too Much Water Stress in Walnuts

Allowing mild and moderate tree water stress in walnut can guard against root diseases and other disorders that lead to tree loss and help get through drought. On the other hand, high and severe water stress can be detrimental to shoot growth and nut size as well as kernel weight and color in walnut. While some tree crops, such as almond and pistachio, benefit from water stress during certain growth stages, walnut is more temperamental. Stem water potential readings more than 4 bars below baseline, which roughly corresponds (depending on weather) with below -8 bars on a pressure chamber gauge, ...

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Herbicide Mode of Action Classification System Receives Important Revisions

The Herbicide Resistance Action Committee (HRAC) recently revised its Herbicide Mode of Action Classification System, an important tool for developing sustainable weed control programs, to include key changes since its last revision in 2010. The changes include a global transition from alphabetical to numerical mode of action codes, five new or reclassified modes of action (MoAs), 15 new active ingredients and rationalization of chemical family names. The transition to numerical mode of action codes is especially important for creating a single, trusted code system. “We in the U.S. mostly use the alphabetical system and most of the rest of the...

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Irrigation Management to Reduce Hull Rot

Management of irrigation, including regulated deficit irrigation, is a proven option for managing hull rot in almond trees, according to UCCE experts and industry professionals. Hull rot nicknamed the “good grower’s disease,” affects trees that are well irrigated and fertilized with nitrogen. “This is because the plant tissue itself is more vulnerable to infection,” said UCCE Orchard Systems Advisor in Madera and Merced counties Phoebe Gordon. In a UCCE San Joaquin Valley Trees and Vines post, Gordon said to use regulated deficit irrigation (RDI) at hull split to induce moderate water stress on the trees. She recommends reducing irrigations...

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Biologically Integrated Orchard Systems Field Day Aug. 27

Community Alliance with Family Farmers (CAFF) is hosting a free on-farm field day that will cover past and present research on the impacts of biologically integrated orchard systems (BIOS) in walnut. CAFF’s BIOS for Walnut project is funded by CDFA through their Biologically Integrated Farming Systems (BIFS) program, which seeks to explore alternative approaches to pest management in California cropping systems. The field day, which takes place on Aug. 27 in Linden, Calif., will cover mating disruption, cover cropping, pressure chambers for water use efficiency, and soil testing. CAFF’s Ecological Pest Management Program Specialist Hanna Kahl said field days are...

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