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California Persimmon Project

If you're a fan of persimmons (Diospyros kaki), a USDA Agricultural Research Service project funded with a grant from the California Department of Food and Agriculture titled “Enhancing the Marketability of California Persimmons” will be of interest to you.  The project seeks to increase the profitability of California persimmons by recommending cultivars preferred by consumers, by evaluating the flavor, nutrient and vitamin content of 55 cultivars, and by developing protocols to rapidly dry persimmons.        

Dr. Rebecca Milczarek, one of the project co-investigators on the project discussed the status of project at the Statewide Master Food Preserver Conference held in June.  The project began with the collection of samples from 55 cultivars.  The cultivars included astringent, non-astringent, and pollination-variant phenotypes.           

Pollination-variant persimmon trees can produce both astringent and non-astringent tasting persimmons.  Those blossoms on the tree not pollinated in the spring produce astringent persimmons with no seeds.  Those blossoms that are pollinated produce non-astringent persimmons with seeds.  “Chocolate persimmons” and “Coffee Cake persimmons” are examples of pollination-variant cultivars.

The cultivar samples are being collected and tested over a two year period.  The samples are from four sources.  Those sources are the National Clonal Germplasm Repository, L.E. Cooke Co. (Visalia, CA), Oak Acre Farms (Live Oak, CA), and O. Bertolero (Santa Rosa, CA).           

Under the project, the persimmon cultivars (both fresh and dried) will undergo a chemical analysis of their anti-oxidant, tannin content, brix, TTA, pH, sugars, vitamin C, and organic acids.  The texture of the dried persimmons will also be evaluated.  And the dried persimmons will undergo several consumer tests.           

Dehydration methods used in the project included traditional Hoshigaki style open air drying the whole persimmons, and hot air drying.  In addition, another preservation method included was freezing the pulp.           

More information on the project can be found at


Posted on Thursday, August 17, 2017 at 9:38 AM

August 19th is National Honey Bee Day: Dr. Elina Niño reminds us to help honey bees cope with pests

National Honey Bee Day is celebrated on the third Saturday of every August. This year it falls on Saturday the 19th. If you use integrated pest management, or IPM, you are probably aware that it can solve pest problems and reduce the use of pesticides that harm beneficial insects, including honey bees. But did you know that it is also used to manage pests that live inside honey bee colonies? In this timely podcast below, Elina Niño, UC Cooperative Extension apiculture extension specialist, discusses the most serious pests of honey bees, how beekeepers manage them to keep their colonies alive, and what you can do to help bees survive these challenges.

To read the full transcript of the audio, click here.

Successful IPM in honey bee colonies involves understanding honey bee pest biology, regularly monitoring for pests, and using a combination of different methods to control their damage.

Visit the following resources for more information

For beekeepers:

For all bee lovers:

Sources on the value of honey bees:



Posted on Thursday, August 17, 2017 at 9:14 AM

A Fly, Oh, My!

A female Eristalis stipator (as identified by Martin Hauser of the California Department of Food and Agriculture, foraging on tropical milkweed. (Photo by Kathy Keatley Garvey)

A fly, oh, my! On the approval scale, they don't rank nearly as high as honey bees, but some are often mistaken for them. Take the Eristalis...

Posted on Wednesday, August 16, 2017 at 5:12 PM

Common Purslane - Problems and Management in Alfalfa Fields

Figure 1. Common purslane. Photo courtesy UC IPM.

We have become aware that common purslane (Portulaca oleracea, Fig. 1) is an increasing problem in alfalfa fields, particularly during the months of...

Posted on Wednesday, August 16, 2017 at 4:08 PM

Pesticide Safety Training Workshop in Yolo County, for Ag supervisors • Growers • Farm Labor Contractors • Safety Managers • Safety Trainers

Dear All,   This training will be offered in Davis, CA in English on Oct 12.  Please share with your friends and colleagues who may be...

Flier Fall 2017 English Spanish 081417[1]
Flier Fall 2017 English Spanish 081417[1]

Posted on Wednesday, August 16, 2017 at 12:46 PM

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