Yearly Archives: 2020

Managing Walnut Orchards for Insect-eating Birds

Codling moth are challenging to control during the growing season because the larvae burrow inside nuts to feed, keeping them safe from natural enemies and insecticides. However, during winter months, larvae are more vulnerable to predators, offering opportunities for biocontrol by natural enemies, including insectivorous birds. Continue reading

Hull Split Timing and Sprayer Practices for Best Pest Control Results

If you wait too long to put on the first hull split spray, it doesn’t matter if it’s done by air, ground or robot, what’s in the tank, how slow you drive or what spray volume you use – you are too late to get the best control possible and it will cost you in both lost crop and quality incentives. Once you get the timing right, you have to get excellent coverage when you spray or you will not get the best control possible and the best net return. Continue reading

Rootstock Trial for Boron Tolerance – 2019 Update

Excessive boron in soil or irrigation water is not widespread in the Central Valley, but where present, it can be a substantial obstacle to almond production. A rootstock trial in Yolo County was designed to find which almond rootstocks do better or worse under high boron conditions. What follows is a summary of findings to date. What follows is a summary of findings to date. Continue reading

Observations on Butte County Rootstock Trials

Over a dozen different rootstocks have been observed in various orchard situations with local growers in Butte County over the past twenty two years. The complete results of these trials can be found in past Annual Rootstock Project Reports to the Almond Board of California. The following article summarizes what the author believes are the most useful results and conclusions. Continue reading

Update on Rootstocks for Prune Production – 2019

Two rootstock experiments in grower orchards were planted in Northern California in 2011. One site in Butte County and a second in Yuba County. The two sites are evaluating the performance of Improved French on 14 rootstocks planted in replicated randomized trials. We previously reported in this newsletter on the results from this trial in 2015 and 2017 issues. Here, updated results are given. Continue reading

Monterey and the Leafing Failure: What could be causing it?

Researchers have historically been unable to pin down a cause for leafing failure because it was a rare event, only being reported periodically in the last couple decades. The problem was noted periodically before 2000, but most recent reports were made by farm advisors of leafing failure symptoms in 2000, 2006, 2010, 2017, 2018, and 2020. Continue reading

Navigating Irrigation Technology Overload

“Technology” has different meanings for different people (Figure 1). In irrigated agriculture we look towards technology to meet our changing needs and sustain our industry in the long run. However, with technology, “confusion” and a sense of overload can hinder our ability to learn and apply it. This article considers the abundance of irrigation technology and the challenges with its adoption. Some ideas are offered to cope with the sense of confusion and overload. Continue reading