Dr Henry Donselman has died
Posted 06 March 2012 - 03:36 PM
Summers are great, 90f/32c in the day & 70f/21c at night with plentiful rain & sun
Winters are subtropical with occasional frosts and freezes. Tropical cyclones happen.
Every 20 years or so it gets cold enough to kill arborescent Ficus benjamina to the ground.
We have a few Royal palms in the warm microclimates.
Posted 06 March 2012 - 09:33 PM
My condolensces to his family.
"The great workman of nature is time."
"Genius is nothing but a great aptitude for patience."
-George-Louis Leclerc de Buffon-
Posted 07 March 2012 - 12:54 AM
Gold Coast Hinterland, Queensland 28S
Mild Humid Subtropical climate
Temp Extremes 4C-42C
Rainfall - not consistent enough!
Posted 07 March 2012 - 01:01 PM
Wow. I have heard of him, and I believe he did some great palm research. For some reason I thought He lived in Florida. He was not active I think much here in the PSSC. But I think he will be missed for his contributions...
My condolensces to his family.
Bill - he was from Florida but moved to California in his later years. It appears that Dr. Donselman's forte was doing research about palm cultivation. His work is referenced in Ornamental Palm Horticulture, 2000. Most of our experiences are with those academics who describe new species and/or publish palm books. Here is a link to Dr. Donselman's informative website you may enjoy.
Here is an older post regarding the above mentioned site: www.palmtalk.org/forum/index.php?showtopic=12031
Posted 07 March 2012 - 01:36 PM
Dr. Henry Donselman, Palm Specialist
29213 Broken Arrow Way<p align="LEFT">Murrieta, CA 92563<p align="LEFT">Phone (951) 698-4636 Cell (760) 250-0768E-mail firstname.lastname@example.org
Michelle Perez, Associate
Freedman Tung & Bottomley
74 New Montgomery Street, Suite 300
San Francisco, CA 94105
Dear Ms. Perez,
You asked that I discuss whether Canary Island date palms (Phoenix canariensis) can still
be safely specified for planting in landscapes in your area. I have been a palm specialist for 30
years and have spent much of my time working with this palm species. While it is true that
Canary Island Date Palms are susceptible to Fusarium Wilt, a serious disease of this palm, it is
not a reason to stop recommending this palm as a part of your plant palette. There are several
reasons for this, but the most important are:
1. Fusarium Wilt is a disease that is almost always spread mechanically through the use of
contaminated pruning equipment (chainsaws). By insuring that sterile pruning techniques
are used in caring for these palms it eliminates the possibility of infecting these palms
with this disease. Contrary to "folklore" Fusarium Wilt is not transmitted by rodents,
birds, insects, or other means.
2. We can almost totally make sure the palms selected for a project are disease free by preinspecting
them for this disease before they are transplanted. Canary Island Date Palms
are "found" in existing landscapes and transplanted to the new landscapes. A qualified
palms specialist such as me can inspect the palms before they are salvaged and determine
if they are free of all symptoms of this disease. Since this disease has a very specific field
diagnostic symptom (one sided death in older leaves) we can tell if a palm has early
symptoms of this disease. The only way a palm can "slip through" this pre-inspection is
if it was recently pruned using non-sterile techniques. When I inspect palms for this
disease I eliminate those palms that were recently pruned, thus avoiding this risk.
3. We use disease free "washed concrete sand" as the backfill for these palms eliminating
the contamination of the soil at the planting site with other palm diseases.
4. I have worked with some of the largest development companies in California (such as the
Irvine Company, Irvine CA) with their palm planting specifications and have had great
success in using this palm to create several spectacular landscapes. I have also worked
with many of the casinos in Las Vegas using this specific palm and have been very
successful in assuring its healthy establishment.
5. Fusarium Wilt is really only a serious concern here in San Diego, Orange, Riverside, and
Los Angeles Counties. It is not a problem in your area. In fact, It is so infrequent in your
area that I have never seen it in the Central Valley, north of Sacramento.
Let me know if you need further information.. I look forward to working with you on this project.
Dr. Henry Donselrnan, Palm Specialist
Posted 15 March 2012 - 08:31 PM
Happy to report that the above referenced CIPDs are doing very well. I'll try to get a photo when the rain clears.
Posted 06 April 2012 - 07:58 PM
Big Island of Hawaii
Windward, rainy side
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