Author Archives: Sacramento Valley Orchards

Selecting the Best Walnut Rootstock for Your Situation – an Update on Commercial and New Clonal Walnut Rootstocks (2026)

Posted on March 24 2026 by Sacramento Valley Orchards

A lot of factors impact the planting decision. Once a site is selected, the three critical decisions in establishing a new walnut orchard are variety selection, rootstock selection, and tree/row spacing. The spacing should be determined after the variety and rootstock are chosen because that combination will determine the ultimate size of the tree, along with the soil type and orchard management. Rootstocks are the foundation of a walnut orchard. Selecting one that tolerates or resists site problems, while providing vigor for optimum tree performance, is key to orchard productivity, health, and longevity.  As pesticide and fumigant options become more limited and restrictive, rootstocks that resist or tolerate soilborne pathogens offer a pathway to long-term management. Continue reading →

Wet years can lead to aerial Phytophthora outbreaks in almond orchards

Posted on January 17 2024 by Sacramento Valley Orchards

Pytophthora was detected as early as mid-February in Fresno County and reported statewide by the early summer of 2023. Almond growers should be prepared to respond to strengthening El Niño conditions and the possibility of a recurring outbreak of aerial Phytophthora. Read for insights about the disease symptoms, the pathogen biology, as well as some management guidelines for this relatively rare but serious disease of almond. Continue reading →