[NAFEX] Manganese poisoning test proposal

lee reich lreich at hvc.rr.com
Fri Dec 2 14:13:37 EST 2005

When I was in graduate school at the University of Maryland 25 years  
ago, Dr. Shanks had a test planting of oriental persimmons at the  
university's experimental station over on the eastern shore in Wye,  
MD. There were very good crops of a number of varieties.

I spoke to Michael Newell at the station and he said that the trees  
are still doing well. Soils are naturally acidic (about 5.5) but have  
been limed. He said there's another experimental planting at the  
university's western Maryland station, where temperatures are colder.  
Those also are still alive.

Lee Reich, PhD

Books by Lee Reich:
Uncommon Fruits for Every Garden
A Northeast Gardener's Year
The Pruning Book
Weedless Gardening

On Dec 2, 2005, at 12:15 PM, Gene wrote:

> Jerry,
> I'll be happy to do the experiment, I'd already had plans to do as  
> much anyway (except I hadn't thought about the lime element).  My  
> site is new and I haven't tested the ph yet, but will soon.  The  
> soil is clay and I'm told very acidic.  It's in southern Md (zone  
> 7) near the tip of a peninsula jutting into the Chesapeake -- can  
> be quite humid/clammy.  There's a few native persimmon along the  
> perimeter of the site.
> "Where KSD is a known problem"  Well, kaki has no history at this  
> site, but I'll be finding out at some point.  Here's a list of the  
> Kaki varieties that I've recently or soon will put in my orchard:   
> Eureka, Giombo, Great Wall, Honan Red, Ichi-Ki-Kei-Jiro, Kyungsun  
> Ban-Si, Lindy's Giant, Miss Kim, Nikita's Gift, Saijo, San Pedro,  
> Sheng, Sung Hui, Tanenashi.  I'm sticking to the astrigent type,  
> thinking that they might do best.
> Gene
> ------------------------------
> Message: 6
> Date: Fri, 2 Dec 2005 01:11:26 EST
> From: Jwlehman at aol.com
> Subject: [NAFEX] Manganese poisoning test proposal.
> To: nafex at lists.ibiblio.org
> Message-ID: <128.6a6378ea.30c13f8e at aol.com>
> Content-Type: text/plain; charset="us-ascii"
> It has been suggested but never proven that one cause of kaki death is
> Manganese poisoning due to low pH or acid soil. Lee is correct,  
> sulfur would only worsen the problem. Unless that isn't one of the  
> causes of KSD. Someone where kaki can be grown and is on acid soil  
> needs to set up an experiment. I can't do it in Indiana.
> What I'd suggest is as follows. Establish 10 D. virginiana 90  
> chromosome
> seedlings in a block on low pH soil where KSD is a known problem.  
> Then in another area next to it another 10 D. virginiana 90C  
> seedlings and lime that area so the pH is 6.5 or higher at a depth  
> of 12 inches. Once the seedlings are established, about 3 years,  
> graft them all to a variety of kaki and I'd suggest Jiro. If the  
> grafts in the acid soil shepherd hook and die while those on the  
> limed block survive it would be good evidence of mineral poising.  
> Would it not?
> Discussion please.
> I'll supply all the seeds anyone needs free.
> Jerry
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