Posts Tagged: strawberry
Paper: Evaluating the Utility of an Electrostatic Sprayer and a Tractor Mounted Vacuum for Lygus Management in Strawberry
Former UCCE Entomology Advisor Shimat Joseph and I just had the linked paper below published in Crop Protection.
Excellent overview of the lygus problem in California strawberries and evaluation of a combination of bug-vac use and the insecticide sulfoxaflor (not registered yet, but useful for this study since it actually works) for management of this pest.
A few points out of the paper to take back to the farm:
1- The use of the bug-vac alone was not sufficient to reduce lygus populations to below that of the untreated check.
2- Treatments using the insecticide sulfoxaflor alone and in combination with the bug-vac reduced the numbers of lygus and the number of cat faced fruit.
3- Neither the bug-vac or sulfoxaflor had any effect on predaceous heteropterans and spiders compared to the untreated check.
The implication out of this work and paper is that the use of an effective insecticide will continue to be the best tactic for control of lygus and mitigation of its damage in strawberries.
Link is here, it will be active until the beginning of October:
Below is a picture of what hail can do to strawberry. A friend forwarded me these pictures of what a freak hailstorm a few days ago over his field left behind. Shredded leaves, pitted and bruised fruit right down to pretty undeveloped green ones, even on the flower. This storm represents a huge setback for his farm.
I'd have a hard time getting up and facing the day after a loss like this, but nevertheless you growers do it as a matter of course.
Bless you for the work you do and the food you grow for us in spite of the curveballs Mother Nature can throw at you.
As we creep towards strawberry planting season on the Central Coast, it is always good to review where we stand currently on nursery cold conditioning, and with this in mind, think about adjustments to the post harvest supplementary chill based on what sort of winter we might be expecting.
Those of you who know me understand my faith in hedging my bets and planning for contingencies. I favor decisions with a high probability of success and decent outcomes over swing for the fences with blow your socks off results but missing and failing most of the time. Short supplemental chill times with early planting dates to get the beat on the competition are not my thing since this strategy puts good plant vigor at risk, especially if this 2017-18 winter is warm.
Chill accumulation for this year looks good at the nurseries up at MacDoel. Using Lassen Canyon Nursery's chill accumulation chart (also appreciate the comps to previous years- very useful), shows that, after a warm start in September, hours have really ramped up and currently as of October 5 we are at 337 total hours according to my Utah model calculations (which subtracts chill during warm weather episodes, and discounts temperatures under freezing - look elsewhere on this blog for how I am doing this). That compares very well with previous years, and is in fact ahead of many of them.
Further, looking forward to what sort of winter we are to expect, let's go to the NOAA weather maps. Quite simply, for all of our strawberry production areas, it is as of now 40% probable that we get temperatures above normal this winter (being December, January and February). This is up from 33% a few weeks ago, so I am sensing a trend which seems to confirm where we are headed.
In conclusion, with solid field chill already in the can but a good probability of a warmer than normal winter in the offing, I would again this year favor just a little bit more supplemental chill than customary.
Attached is the latest iteration of the grower guidelines a number of us at UC Cooperative Extension have written and have had published by the California Strawberry Commission.
Super timely since planting is right around the corner, this piece on anthracnose in strawberry caused by the pathogen Colletotrichum , was written by myself, Steven Koike and Oleg Daugovish. It was then reviewed by our strawberry science colleagues Gerald Holmes, Kelly Ivors and Jenny Broome. Translation into Spanish (attached below) done by the Commission's Ariel Zajdband into pitch perfect Spanish in a single hour. The Commission's Joy Jacobs kept the project moving and she and Mercy Olmstead brought it over the finish line.
I'm really very proud of this team effort to put the latest settled science on a serious disease into the hands of growers, PCA's and industry people. I am privileged to work with such a great team of people!
Anthracnose of Strawberry September 2017
Anthracnose of Strawberry September 2017 Spanish
I've had this forwarded to me a bunch of times over the past few days, and finally did have a chance to read the whole thing. Although I trend more towards the meat and potatoes fare of the Wall Street Journal, it's always a pleasure to read the beautiful mastery of English on tap at the New Yorker magazine.
I wouldn't say the title is quite congruent with the content, since the UC program plays a huge role in the story as well.
Final comment without getting into too much detail, is that while the author did a really good job of writing, some of the opinions shared with her (yes, opinions) don't agree with what I believe.