Environ. Horticulture, Pears, Cherries, and Viticulture
University of California
Environ. Horticulture, Pears, Cherries, and Viticulture

Strawberries

Spotlight on Farming Strawberries Indoors

It looks like even the Wall Street Journal has caught the urban farming bug.  Link to article below out of their "The Future of Everything" series, followed by my comments.

 

https://www.wsj.com/articles/strawberry-jam-urban-farming-startups-tackle-a-problem-crop-1534424400?mod=searchresults&page=1&pos=1

I find it utterly mind-blowing the obsession with pollination indoors.  Strawberries are self-pollinated and do pretty well in the absence of bees, it is even noted in the article towards the end that a grower who spends a lot of time with her plants already doesn't see any issues.

No mention of Botrytis grey mold, which in a windless, less than ideally ventilated space must be a fearsome problem. Ditto mites.  All of this is lost on the obsession with pollination. 

Instead, the indoor growers really should be focusing on light (intensity and length) and temperature, and I'd personally invest some time on seeing responses to different chill times pre-plant.  Would it even be possible to artificially chill plants in the closed environment after fruit production as a form of renovation?  Now THAT would be interesting and possibly yield big dividends, certainly much more than getting one's shorts in a twist about pollination.

Nice quote by Gerald from the CalPoly Strawberry Center, bringing everyone back to reality on what it is going to cost to farm berries like this.  

 

 

Posted on Sunday, August 19, 2018 at 4:06 PM

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:


https://authors.elsevier.com/a/1XWqVxPFYekQG

 

Attached Files
I-HM-LDES-NM

I-HM-LDES-NM
I-HM-LDES-NM

Posted on Wednesday, August 8, 2018 at 10:15 AM
Tags: bug-vac (1), insecticide (1), lygus (10), strawberry (73), sulfoxaflor (3)

Armyworms on the March

Interesting farm call this morning. A strawberry grower near Watsonville reported a large group of worms (caterpillars) migrating north out of the mixed cover crop including barley and mustard.

These worms were identified by our new UCCE entomologist Alejandro del Pozo as being a species of armyworm, for which this sort of behavior is not unusual. One distinct characteristic to ID these worms is the ‘Y' shaped suture on their forehead. For instance, the beet armyworm,Spodoptera exigua, could be a problem in strawberries when high infestations are left unmanaged. You could read more about the beet armyworm as pest of strawberries on the UCIPM guidelines at http://ipm.ucanr.edu/PMG/r734300611.html

 

Knowing that these creatures do feed on strawberries, the advice to the grower is to mow and disk the cover crop to destroy the majority of these worms. Yes, the grower is forfeiting some of the benefit of the cover crop he expected to keep going until the end of August, but the risk to his strawberry crop of this large population of armyworms is greater.

Armyworm on strawberry
Armyworm on strawberry

Armyworm egg cluster.  Note that it occurs as a mass.
Armyworm egg cluster. Note that it occurs as a mass.

Posted on Tuesday, July 31, 2018 at 5:10 PM
Tags: armyworm (1), cover crops (3), egg cluster (1), egg mass (1)

Perishable Commodities Act Meeting August 2

UC Cooperative Extension is hosting a Perishable Commodities Act meeting at its office on 1430 Freedom Blvd, Ste E in Watsonville on August 2.

See flyer posted below for details.

 

Attached Files
PACA Meeting poster
Posted on Wednesday, July 25, 2018 at 12:02 PM

Crossing the River While Feeling the Rocks

I don't write too much about it in this space because it tends more in the area of "shop talk" for us in extension, but a great interest of mine is how one successfully executes a program of extension.

One of the temptations for the new extensionist is to jump in with both feet first, hit the ground running and get some change underway immediately. In our world of berries, there are so many things that need to be done, from getting away from chemical fumigation, reducing pesticide use, improving labor efficiency, managing invasive pests and the implementation of technology. 

The problem is, as many eager people find out to their chagrin, that there are many, many interested parties involved in all of these things, and might not take so kindly to pushes for abrupt change.

To get my point across, I'll refer to the economic reformation of China that become the dictum under Premiere Deng Xiaopeng in the late seventies.  Called "Crossing the River While Feeling the Rocks" it is change brought about in a piecemeal manner.  Rather than forcing giant leaps forward, it rather worked towards change in a cautious way, first testing policies on a small scale, ramping up the successes and discarding the rest.  

This piecemeal approach reduces risk and disarms opponents.  Initial successes encourage others to back the changes, and  one change leads to the next in an evolutionary manner.  In such a way, rather than an approach using giant steps, the damage of such a small step orientation to the social fabric of the community to which one has been assigned is minimized.

A cautionary tale of perhaps how not to start out is from our own industry of an organization that was setting up its own research and extension program a number of years ago.  Casting aside any hint of a piecemeal approach, and certainly not feeling their way as they went along, they pressed the pedal to floor and moved hot and fast. It was clear these were people with a real agenda, with the smarts, vigor and access to deep pools of money to make it all happen.

Unfortunately, attempting to make giant steps forward without getting too many bearings of the surroundings didn't work out so great.  An aggressive and well funded program emerging in the midst of a number of established campaigns is bound to make waves and this one did not disappoint.  With that alone there was lots of turmoil, but what really roiled the water was the decision, either through hubris, lack of experience or something else, to trash everyone else working in the community of berry research.  Which of course blew a pretty decent sized hole in the social fabric, to say the least.

Perhaps unsurprisingly, rather than disarming opposition, this program solidified it. None of the big changes intended to be brought about were supported by anyone else, collaboration evaporated and they found themselves outside of the industry research and extension mainstream. Needless to say the whole operation collapsed and is now only a shadow of what it once hoped to be.

Good to start steady and slow, and feel out the rocks.

 

Best to feel out the rocks while crossing the river lest one get washed away.
Best to feel out the rocks while crossing the river lest one get washed away.

Posted on Saturday, July 21, 2018 at 1:25 PM

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