Author Topic: Yellowing Japanese Black Pine  (Read 5263 times)

Jeff Lahr

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Yellowing Japanese Black Pine
« on: August 31, 2009, 09:34 PM »
I've only worked with JBP for a couple of years but this one doesn't look too healthy to me.  I haven't treated it different than my other pines, all of which appear to be pretty robust.

I don't want to lose this one. Any insight?
 

John Kirby

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Re: Yellowing Japanese Black Pine
« Reply #1 on: September 01, 2009, 05:05 AM »
Hi Jeff,
The first thing I say when I see a tree like this is- roots. Is it pretty well root bound within the container? One thing you can try (I have done this in the hottest part of July here in the Midwest) is to pull the tree out of its curent container and slip pot it into a larger container (1gal to two gallon; 6' pan to 8-10" pan). Setting it on coarse material (pumice, volcanic, or like 3/8" garvel to get a more rapidly draining environment.

Second, I would spray it with a fungicide, such as daconil  (or one of the available over the counter fungicides).

Light fertilizer in a couple of weeks and good luck.

John
 

King Kong

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Re: Yellowing Japanese Black Pine
« Reply #2 on: September 01, 2009, 06:00 AM »
If the roots occupy the total space between soil particles with no effective space left for new roots to occupy, chlorosis is a symptom.
With a plant with decreased green plant tissue because of decreased chlorophyll and root bound, I like to foliar feed to correct the nutrient deficiency while taking care of container problem.

__gary
 

Steven

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Re: Yellowing Japanese Black Pine
« Reply #3 on: September 01, 2009, 07:33 AM »
Would this also cause an iron deficiency? I ask because the needles look similar to insufficent iron on some JBP I've seen.
 Steven
 

King Kong

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Re: Yellowing Japanese Black Pine
« Reply #4 on: September 01, 2009, 08:10 AM »
Easy to find out. You will know in a week or two if you foliar feed it with a good quality micronutrient application.

__gary
 

MatsuBonsai

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Re: Yellowing Japanese Black Pine
« Reply #5 on: September 01, 2009, 08:52 AM »
I'm with John on this.  When was the last time it was repotted?  What type of soil?
 

Jeff Lahr

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Re: Yellowing Japanese Black Pine
« Reply #6 on: September 01, 2009, 10:49 AM »
Wow, thanks for all of your replies. I've owned this tree for two years. I repotted it from a five gallon container to this pot (about 2 gallon) in spring of 09. At this time I reduced half of the root ball. I plan to reduce the other half next spring... if its alive.
 

John Kirby

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Re: Yellowing Japanese Black Pine
« Reply #7 on: September 01, 2009, 11:00 AM »
Have you fertilized it? The needles look not only yellow, but quite fine. Roots, nutrients (since it was repotted) and fungus. John
 

AlexV

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Re: Yellowing Japanese Black Pine
« Reply #8 on: September 01, 2009, 11:03 AM »
I bought a black pine that looked like that last fall.  I left it over the winter then re-potted it this spring.  When re-potting all the soil was removed from one side but the roots were left long (I assume this is what you mean by reducing?).  After a month I began fertilizing and at this point the tree is green and happier.  Note, decandling should never be done on a weak tree.  It sounds like we did similar things, which makes me wonder if it is something other than roots your tree is having issue with.  Have you been fertilizing it since it was re-potted?  Was it decandled?  
 

steve

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Re: Yellowing Japanese Black Pine
« Reply #9 on: September 01, 2009, 01:29 PM »
I think a dose of epsom salts would go a long way without a chance of disturbing the tree. I think slipping into a larger pot is a good idea as well but nutrients will have to be made available.