January 2020 Newsletter Archives - West Coast Nut

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January 2020 Newsletter



Ideal Pistachio Crop Harvested in 2019


Pistachio nuts were invisible this year. That is they were invisible to the damaging navel orangeworm. United States Department of Agriculture/Agricultural Research Service (USDA/ARS) researcher Joel Siegel said that good pistachio hull integrity is the reason to thank for the very minimal navel orangeworm (NOW) damage in this year’s pistachio crop. Siegel explained that as pistachio nuts mature, hull slip begins. At that point there is an odor cue that alerts NOW to move in and lay eggs. As long as the hulls remain intact, Siegel said, NOW do not recognize the nuts as an egg-laying site. Good hull integrity...

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Hazelnut Pruning Strategies


Seasonal hazelnut pruning strategies, said Oregon State University’s Nik Wiman, depend on the age of the trees, orchard design and variety susceptibility to Eastern Filbert Blight (EFB). Growers typically will begin their orchard pruning operations after trees enter dormancy in the fall, but given the inevitable fall and winter rainfall, they will get into the orchards when they can, Wiman said. No optimal time for pruning trees has been determined by research. Choosing a time when no rain is forecast for several days will help prevent infections from pruning wounds. Training and pruning young trees during the first two years...

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New Technologies for Growers


New agricultural technology showcased at the 2019 Almond Conference included a micro tensiometer for irrigation management, a noninvasive hive grading tool, a unique delivery system for crop protection and a data collection platform for managing pesticide applications, harvest activities and other field operations. Michael Santiago, CEO of FloraPulse said the fully automated sensing device eliminates the labor associated with the pressure bomb, the gold standard in determining tree water stress. The patented sensors, which have undergone field trials in winegrapes, almonds and apples, are embedded in the tree trunk to monitor water stress. In the trials, Santiago said, their accuracy...

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Recovery From Freeze Damage


No leaf out of some walnut orchards last spring after the 2018 November freeze caused grower concern, but the trees are beginning to recover, said University of California Cooperative Extension (UCCE) orchard stems advisor Luke Milliron. In his Sac Valley Orchards newsletter Milliron said the sudden November 2018 freeze event that caused extensive damage in many walnut orchards is a reminder to prepare against extreme weather events. Milliron, who works with walnut growers in Butte, Glenn and Tehama counties, said the trees’ regrowth later in the spring from dormant buds showed that many trees will be able to recover over...

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