Bill Pramuk is an independent Registered Consulting Arborist, professionally dedicated to helping people with tree care issues. Visit his website: www.billpramuk.com.
I once asked a nursery co-worker I respected for his knowledge and years of experience: “Why do trees reach a certain height and then stop growing taller?”
Last week, watching a documentary on the life of Dr. Marian Diamond, a UC Berkeley professor of anatomy, it occurred to me that her work on brain anatomy evokes some comparisons with tree anatomy.
For the seventh year in a row, Napa “citizen scientists” participated with the UC Berkeley Forest Pathology and Mycology Lab in an ongoing effort to track Sudden Oak Death (SOD), the exotic disease that has killed hundreds of thousands of oaks and tanoaks in California.
Napa Resource Conservation District’s (RCD) “Acorns to Oaks” project received a big boost this year. Nature provided a huge crop of acorns while volunteers came out in unprecedented numbers to plant them at our fall event.
I received an email from a local reader, Al Verstuyft saying, as a member of the Rotary Club of North Napa, “We are starting to think about how we could be part of the reforestation effort” and how the Lake County Resource Conservation District (RCD) was kind enough to share their experience…
After the bad news coming out of the fires — deaths, destroyed homes, friends and clients suffering terrible losses, and swaths of forest burned — let me offer a perspective with respect to our trees and woodlands.
A friend recently planted some citrus trees and asked me for tips on pruning. That sounds like a simple request, but when you look into the subject you find all manner of complications.
After a recent high school reunion, I got together with a good friend I had not seen in many years. When I visited with him and his wife at their home in Sacramento, he took the opportunity to ask me one of those “well, since you are here, can you look at my tree?” questions.
In my previous column, I discussed the recent increase in limb failures in trees of certain species that responded to last winter’s heavy rainfall by producing heavy loads of new growth.
During previous years of drought, we saw many trees growing more slowly and foliage thinning out. At the same time, invisibly, trees were rendered more susceptible to certain diseases, decay, and structural problems.
Taking an early morning walk one day this week we walked past a geyser. In a nicely tended, water-efficient landscape planting, water was spouting about 20 feet in the air and out onto the street. It looked hilarious, but it is a sad waste of water.
A client called, alarmed about his beautiful, mature blue oak. He had been away for a two-week trip. When he returned, he saw the oak, which had looked perfectly healthy before they left, now looking half dead.
Last week, a worried homeowner called me about a mature tree that had fallen and was leaning on her fence. She was concerned it might fall farther and cause more property damage.
OAKLAND — Dozens of teens robbed and assaulted passengers on a Bay Area Rapid Transit train in Oakland over the weekend in an apparently orchestrated attack, authorities said Monday.
The Civil Air Patrol suspended the search Monday in the Sierra Nevada mountains for a plane with two Santa Rosa residents on board that never arrived at the Petaluma Municipal Airport a week ago.
BERKELEY — University of California, Berkeley students who invited Ann Coulter to speak on campus have filed a lawsuit against the university, saying it is discriminating against conservative speakers and violating students' rights to free speech.
The Sierra snowpack is deep, the reservoirs are full and Gov. Jerry Brown has declared the drought officially over. This is a huge relief for California drought-stricken conifer forests and oak woodlands. But, pardon a pessimistic twist on an old saying, “Every silver lining has a dark cloud…
Last November, I got into the topic of mushrooms and trees (Mushrooms: Another Kingdom Heard From, 11/5/16). The impetus was a sudden flush of mushrooms appearing soon after generous rainfall in October. Then, with a wet winter, mushrooms and other fungal fruiting bodies continued to appear …
I received a most thoughtful Christmas gift from my son Ian, a book I had been looking forward to reading: “The Hidden Life of Trees, What They Feel, How They Communicate, Discoveries from a Secret World” (Peter Wohlleben, Random House 2015).
In a text message this morning (Jan. 16), a concerned landscape maintenance contractor said “I’m pruning Japanese maples and I see a lot of bleeding on cuts. Any concerns?”
After 20 years and nearly 500 columns in this newspaper, I’ve covered just about everything I see as important in tree care. And I have skipped a few topics that might be of limited interest, like the “marmorated stink bug” and the “bow-legged fir aphid.”
Back in September, I wrote about the Acorns to Oaks project, one of many projects planned and implemented by our Napa County Resource Conservation District (RCD) in partnership with volunteers, other organizations like Friends of the Napa River, landowners, and farming companies.
Shinrin-Yoku, translated from Japanese, as “forest bathing” suddenly became “a thing” to me after I heard it mentioned at a tree care seminar earlier this year. The term then started popping up over the following few months.
There is a saying I learned in my retail nursery trade days here in Napa: Fall is the second spring. Judging by the odd assortment of plants in bloom, it looks a lot like spring right now.
This spring, about 500 volunteers joined in the effort at 23 areas in coastal California to map Sudden Oak Death (SOD). Napa had a good-sized group of “citizen scientists” who joined in to search for the tree-killing disease, surveying over 700 trees in Napa County.
Last time, writing on this year’s rash of leaf diseases, I closed with this: Trees that have good vitality tend to be more resilient. Pay close attention to growing conditions in the tree root zones and correct any problems as much as practical.
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Too often, pruning is urgent damage control, or catch-up work on long-neglected trees. Ideally, for transplanted landscape trees, it is a long-term and low-intensity process beginning when the tree has begun to form branches.
While the improvement in rainfall last winter and this spring brought us some relief from drought it also brings an increased risk of Sudden Oak Death disease spreading from infected California bay laurel trees into susceptible oaks.
I have written a few columns discussing Italian cypress trees over the years. The subject seems to have taken on a life of its own. I have responded to emails and phone calls about growing this species in Southern California, Arizona, Mexico, Virginia, and Southern France.
One reason I enjoy my work is being outdoors a lot. Even when the weather is wet, as it was in early March, I can get out there and get a lot done while enjoying the sensations of a green and rainy winter.
Concerned citizens and scientists have joined forces to combat a major threat to walnut trees: Thousand Cankers disease, a fungal infection, spread by the tiny, native walnut twig beetle. Susceptible trees include our magnificent Northern California black walnuts, Paradox walnuts and English…
The Christmas tree is in the recycling bin and the lights will be coming off the house as soon as we get a dry weekend day. And soon we will see our winter-blooming trees beginning to show color. Let these be reminders for us to take care of tree work in step with the rhythm of the seasons.
Last week, writing about the top 10 tree problems for 2015 I mentioned foamy canker disease in live oaks. It could turn out to be a major threat to oak woodlands. On the other hand, it might just be a threat to trees stressed by drought.
I spoke at the annual Sonoma County Regional Parks Pest Control Applicators Seminar last week in Santa Rosa. Speaking to about 150 landscape pest control people including more than 40 Certified Arborists, my topic was “The Top 10 Pests and Diseases for 2015.”
Fireblight, a bacterial disease that infects many trees and shrubs in the rose family, showed such a horrendous degree of infection this year that I wrote two columns on it last spring (May 16 and 30). Now as the growing season winds down and I see hundreds of badly affected Aristocrat pears…
Reading about San Francisco celebrating the centennial of the Panama-Pacific International Exposition (PPIE), I realized 2015 also marks the approximate centennial of the arrival of one of the best trees for our local landscapes: the Marina strawberry tree (Arbutus Marina). We designated it …
In April, for the fifth year in a row, Napa contributed to the SOD Blitz (Sudden Oak Death), a distinctive collaboration of volunteer “citizen scientists” and the UC Berkeley Forest Pathology and Mycology Lab, to map and learn about Sudden Oak Death disease. The results have just been announ…