Self-fertile Nonpareil has the potential to be a gamechanger for California almond growers. Both Sierra Gold Nursery (FruitionOne™) and Burchell Nursery (Nonpareil SC+) announced in late 2024 their partnerships with biotech companies to develop a self-fertile Nonpareil. Both nurseries plan to begin delivering these trees to growers in 2027. However, many questions remain. In this episode Reid Robinson CEO of Sierra Gold Nursery discusses the development and future for FruitionOne™.

Self-fertile Nonpareil has the potential to be a gamechanger for California almond growers. Both Sierra Gold Nursery (FruitionOne™) and Burchell Nursery (Nonpareil SC+) announced in late 2024 their partnerships with biotech companies to develop a self-fertile Nonpareil. Both nurseries plan to begin delivering these trees to growers in 2027. However, many questions remain. In this episode Tom Burchell owner of Burchell Nursery discusses the development and future for Nonpareil SC+.

Dr. Themis Michailides (UC Davis Plant Pathologist at the Kearney Ag Center) provides a critical update on his lab’s research on the biology and management of walnut mold.

Facing tightening SGMA regulations and the specter of future droughts, how should we be designing the almond orchard of the future? On the podcast, Franz Niederholzer discusses his idea of a test almond orchard at the Nickels Soil Lab with different rootstocks provided reduced irrigation treatments from planting onward. Should a grower provide full irrigation to fewer acres, or reduced irrigation to their existing farming footprint?

Researchers have been conducting almond irrigation and other studies at the Nickels Soil Lab in Arbuckle, CA for over 50 years! On the podcast, Franz Niederholzer revisited research on early microirrigation, the consequences of late season drought in young almonds, and the implications of one-year of season-long drought in mature almonds. Dialing in irrigation is the greatest task for California orchardists, and we should continue to learn from the lessons of our predecessors.

Environmental bud failure showed up in almonds in a big way in 2025. From a subtle delay of leafing in parts of Nonpareil canopies throughout the Central Valley to some orchards in the northern Sacramento Valley with only half leaf out. This disorder also called leafing failure, severely affected many growers in the northern Sacramento Valley. Dr. Tom Gradziel (UC Davis) gets into the complexities of this disorder, as well as discussing the unusual bloom in 2025.  

If you work in the almond industry, you likely know non-infectious bud failure (NBF) is bad news. However, do you understand why NBF happens, and that we’re likely to see it on future almond varieties, not just on Carmel? Tom Gradziel discusses the science behind NBF and the work UC researchers together with nurseries have done to make massive gains in addressing the problem.

Regenerative agriculture is currently all the rage these days in some circles. With a broad range of practices that can be classified as regenerative, it still can feel like a mushy term that means different things to different people (which is actually by design). Amelie Gaudin sits down with Phoebe Gordon to discuss what qualifies as a regenerative practice, how the focus differs from “conventional” agriculture, and the science behind it (spoiler alert: you’re probably already familiar with a lot of it!). Come to an upcoming extension meeting! And finally, the 2025 International School on Microirrigation for Crop Production: Class Lectures at UC Davis October 13-15, and field trips October 16-17. The views, thoughts, and opinions expressed are the speaker’s own and do not represent the views, thoughts, and opinions of the University of California. The material and information presented here is for general information purposes only. The "University of California" name and all forms and abbreviations are the property of its owner and its use does not imply endorsement of or opposition to any specific organization, product, or service. Follow us on Twitter! @SacOrchards and @SJVtandv Thank you to the Almond, Pistachio, Prune, and Walnut Boards of California for their kind donations. Thank you to Muriel Gordon for the music.

Walnut scale is a minute insect pest that can, if populations build high enough and kill fruiting wood. It can do this by directly allowing pathogens entry into walnut wood, or by weaking branches, making them more vulnerable to infection. In this episode In this episode, Elizabeth Fichtner discusses the lifecycle of the pest and control options. Note: while walnut scale does appear in almonds, this episode only covers walnuts. Mention of a pesticide does not constitute a pesticide recommendation, merely the sharing of research results. Consult your PCA and read the pesticide label. The label is law. The views, thoughts, and opinions expressed are the speaker’s own and do not represent the views, thoughts, and opinions of the University of California. The material and information presented here is for general information purposes only. The "University of California" name and all forms and abbreviations are the property of its owner and its use does not imply endorsement of or opposition to any specific organization, product, or service. Follow us on Twitter! @SacOrchards and @SJVtandv Thank you to the Almond, Pistachio, Prune, and Walnut Boards of California for their kind donations. Thank you to Muriel Gordon for the music.

A great deal goes into a successful prune crop. In part two or a two-part podcast on prune crop phenology we complete the yearly cycle by talking about summer fruit growth, key financial considerations at harvest, and finishing the season strong in the postharvest period. Luke Milliron assembled an expert panel of UCCE Farm Advisors, Franz Niederholzer (UCCE Colusa), Jaime Ott (UCCE Tehama), and Becky Wheeler-Dykes to talk about each step in prune fruit development from buds to harvest and back-again.

A great deal goes into a successful prune crop. In part one of a two-part panel, Franz Niederholzer (UCCE Colusa), Jaime Ott (UCCE Tehama), Becky Wheeler-Dykes (UCCE Glenn) and host Luke Milliron (UCCE Butte) talk about the formation of fruit buds all the way through to fruit thinning in spring.

Oak root fungus (Armillaria root rot) is a devastating disease that can plague orchards generation after generation. Resistant rootstocks is the answer. Roger Duncan (UCCE Advisor Emeritus) discusses early findings in his ORF rootstock trial.

Phytophthora isn’t just an early season problem anymore. On this episode of the podcast, Dr. Jim Adaskveg (UC Riverside) talks warm season phytophthora management in almond.

We know pistachios, and we love to eat them. Despite pistachio ice cream being the objectively best way to consume this nut , the majority of pistachios are sold in-shell. Have you ever wondered how those shells split? In this episode, Phoebe sits down with Shuxiao (Susan) Zhang and Georgia Drakakaki, two of the authors of a recently published study on the mechanisms behind pistachio shell splitting. They discuss how the cells of a shell enable splitting, whether kernel size really does impact split percentage, and why Golden Hills has a higher split percentage than Kerman. Come to an upcoming extension meeting! In the Sacramento Valley: North Sac Valley Groundwater and SGMA is on Tuesday, June 24 Save the date for Prune Research Tour Part 2 on Tuesday, July 15  The views, thoughts, and opinions expressed are the speaker’s own and do not represent the views, thoughts, and opinions of the University of California. The material and information presented here is for general information purposes only. The "University of California" name and all forms and abbreviations are the property of its owner and its use does not imply endorsement of or opposition to any specific organization, product, or service. Follow us on Twitter! @SacOrchards and @SJVtandv Thank you to the Almond, Pistachio, Prune, and Walnut Boards of California for their kind donations. Thank you to Muriel Gordon for the music.

Johnsongrass can be a tough weed to control. Ryan Hill (UCCE Tehama) comes on the podcast to update us on the integrated year-round management of this perennial weed in orchards.

Dr. Pat J. Brown (UC Davis) discusses exciting new clonal rootstocks being developed by a team of UC and USDA researchers. Pat is looking for growers to trial these new clones, in particular K3 an exciting new rootstock that has produced good growth, yield, and very low crown gall.

Three PhD entomologists with UC Cooperative Extension: Sudan Gyawaly, Jhalendra Rijal, and Houston Wilson discuss integrated management of the leaffooted and stink bug pest complexes in California nut crops. Be sure to first listen to part I where the three experts discuss phenology and monitoring of these pest complexes.

Three PhD entomologists with UC Cooperative Extension: Sudan Gyawaly, Jhalendra Rijal, and Houston Wilson discuss the phenology and monitoring of the leaffooted and stink bug pest complexes in California nut crops. Including an exciting update from Houston Wilson (UC Riverside) on the trap and lure for leaffooted bug. Stay tuned for part two where the expert panel discusses the integrated management of these pests.

Dr. Roger Baldwin (UCCE Specialist in Human-Wildlife Conflict Resolution) discusses orchard management of pocket gophers, ground squirrels, voles (meadow mice), roof rats, and deer mice. This is a compilation of two episodes from 2022, with Luke Milliron providing a new introduction with highlights from 2024/2025.

Drs. Or Sperling (ARO-Volcani) and Maciej Zwieniecki (UC Davis) discuss their groundbreaking research on almond irrigation.