UC Nursery and Floriculture Alliance
University of California
UC Nursery and Floriculture Alliance

From the UC Blogosphere...

Five Reasons Why All This Rain Is Bad for Almond Pollination Season

During a sun break on Feb. 12, 2017, a  pollen-laden honey bee heads for more almond blossoms in Benicia. (Photo by Kathy Keatley Garvey)

It's not a good time to be a California almond grower or a beekeeper. And it's definitely not a good time to be a honey...

Posted on Monday, February 20, 2017 at 4:55 PM

Weed Control With Corn Meal?

Advice for the Home Gardener from the Help Desk of the
UC Master Gardener Program of Contra Costa County

Client's Request:  I've heard that I can use yellow corn meal to control weeds. Is this doable and will it hurt the soil? 

Help Desk Response:  Thank you for contacting the UC Master Gardener Program Help Desk with your question about cornmeal and weeds. I am going to assume that you mean corn meal gluten (CGM), a by-product of corn starch manufacturing that is marketed to home gardeners for pre-emergent control of weeds, especially in lawns. Yellow corn meal makes great polenta, but won't do much for weeds!

University of California research has not shown CGM to be an effective weed control strategy, but in a lawn, it may work because it is high in nitrogen and will feed the lawn, making it more dense, and likely crowding out weeds. Lawns already fed with high nitrogen fertilizers probably won't show any significant benefit from CGM. 

CGM will have no effect on already-emerged weeds; it only suppresses some seeds' ability to sprout. It is sometimes used though where only organic herbicides are permitted, but its effectiveness is still questionable. It should not have adverse effects on soil. Because it is high in nitrogen, it could be beneficial if your soil is deficient in that nutrient.

Better weed control can be achieved by heavily mulching the area, which will prevent weed seeds from sprouting. At this time of the year, late winter, when many of our weeds have already come up, you can try hand-pulling or hoeing out the small weeds. They are always easiest to control when they are small. This link will give you great information from UC about weed management in the landscape: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7441.html. The key to successfully reducing the weed problem in future years is to make sure none of this year's weeds go to seed.

Weeds in our gardens are frustrating and seem to be extra-abundant this year because of all the rain we've had. Good luck!

Help Desk of the UC Master Gardener Program of Contra Costa County (SEH)
Don't miss our 2017 Great Tomato Plant Sale:

Note: The  UC Master Gardeners Program of Contra Costa's Help Desk is available year-round to answer your gardening questions.  Except for a few holidays, we're open every week, Monday through Thursday for walk-ins from 9:00 am to Noon at 75 Santa Barbara Road, 2d Floor, Pleasant Hill, CA  94523. We can also be reached via telephone:  (925) 646-6586, email: ccmg@ucanr.edu, or on the web at http://ccmg.ucanr.edu/Ask_Us/ MGCC Blogs can be found at http://ccmg.ucanr.edu/HortCoCo/ You can also subscribe to the Blog  (http://ucanr.edu/blogs/CCMGBlog/). 


Posted on Monday, February 20, 2017 at 12:15 AM

Pruning Fruit Trees



Pruning Fruit Trees

By Jutta Thoerner UCCE Master Gardener


Please tell me how to prune different types of fruit trees?  Mark, Atascadero.


Here is a list on how to prune the fruit trees that are common in your area:

Apricot: these trees have an upright and vigorous growth habit. Apricots produce fruit on short-lived spurs. It is best to cut back all the previous year's growth by ½ or more which will encourage new growth and new spurs. Apricots (and Cherries) should not be pruned in wet weather. Six weeks of dry weather assures that they don't get infected with Eutypa, a form of wood canker. It's safest to wait until summer to prune for the following year's fruit set. Prune apricots annually.

Apple: a tree with a spreading habit.  Most of the fruit develops on spurs 2 years old and older. The productive life of spurs is about 5 years. Therefore, don't remove spurs. Do, however, remove all dead wood and branches which rub together. Thin out branches to let in sun light and remove water shoots. Prune annually and when dormant.

Pear: trees can be upright or spreading, depending on varietal. Fruit matures on spurs 2 years or older. The productive life of spurs is 10 years or more! Prune lightly only removing dead wood or rubbing branches. Prune annually when the tree is dormant.

Peach and Nectarine: trees have an upright and spreading growth habit.  Fruit is borne on the previous year's growth. This means new fruiting wood must be produced every year in order to have good fruit production. Heavy, annual pruning is recommended. Pruning a minimum of ½ of last year's growth, mostly done by heading, is a must. Prune when dormant.

Plum: European plum is upright; the Japanese plum is variable and can be spreading. Fruit is born on spurs 2 years old and older Spurs are productive 6-8 years. Prune lightly, thin and remove dead wood. Prune annually and when dormant.

Don't forget to use tools that are sharp and clean. It is advised to disinfect all pruning tools between each tree.  A solution of one part rubbing alcohol to one part water is a sufficient disinfecting dip for the blade or saw end of your tools.

For further information the UC ANR Publications website offers books such as Home Orchard: Growing Your Own Deciduous Fruit and Nut Trees.

Enter promo code PRLUS40 to receive 10% off your purchase.



Posted on Sunday, February 19, 2017 at 9:19 AM

KUIC Meets the Entomologists and Coco McFluffin

Oh, no, an escapee! Lynn Kimsey (left), director of the Bohart Museum of Entomology and KUIC host Barbara Hoover share a laugh as a Madagascar hissing cockroach decides not to star but to escape. (Photo by Kathy Keatley Garvey)

It was a buggy, sweet kind of day when KUIC Radio 95.3  hosted a coffee break for the Bohart Museum of Entomology and...

Posted on Friday, February 17, 2017 at 4:40 PM

UC Davis Researcher: What Repellents and Doses Are Best to Prevent Zika Virus

Working on zika-virus research are UC Davis chemical ecologist Walter Leal (foreground) and colleagues and co-authors Rosangela Barbosa (center) and graduate student Gabriel Faierstein of FIOCRUZ-PE, Recife, Brazil.

If you're traveling to—or living in--a Zika virus-infested area, it's far better to use DEET rather than Picaridin and...

Posted on Thursday, February 16, 2017 at 2:00 AM

Next 5 stories | Last story

Webmaster Email: lroki@ucdavis.edu