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Author Topic: Shimpaku yellowing  (Read 2181 times)
richjay
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« on: June 16, 2013, 06:27 PM »

Hello everyone.
This is a wonderful forum.  My name is Rich and this is my first post. I would love any advice on a shimpaku issue I have.
I've had this tree for about a month and the it seems to be yellowing in certain areas.  The soil seems to be ok ( not too wet or dry).
I have it if a fairly sunny area and water about once a day.  I seems to be getting worse every day.
The only thing I've done is fertilize it a few weeks ago with a handfull of Green Dream and did pruning of some new growth.

I attached a photo of the yellowing that is accuring.

Thank you!
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John Kirby
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USDA Hardiness: 6



« Reply #1 on: June 16, 2013, 09:23 PM »

Where are you? Generally speaking.

Remove the yellow foliage. Next thing is to go in and remove all of the old foliage in side, it win't have green growing tips or will be pointed down (dangling). Once it is cleaned and opened up it will help. Next, only prune to lignified wood, brown not green. Finally check with locals to see about fungicide requirements, or tell us where you are, and wstch outfor pedts like mites and bugs that feed on shoot tips.
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richjay
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« Reply #2 on: June 16, 2013, 09:53 PM »

Hi John,

Thanks for the info.  I'm located in lower Westchester NY.
Sorry I'm fairly new to Bonsai and I didn't understand what you mean by "only prune to lignified wood, brown not green"

I'm going to pinch off all the yellow and old follage tomorrow. 
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augustine
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USDA Hardiness: 7A

« Reply #3 on: June 17, 2013, 09:36 AM »

Check for spider mites. I use neem oil according to directions with a touch of dish soap and a capful of alcohol in the spray bottle.
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bwaynef
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USDA Hardiness: 8a



« Reply #4 on: June 18, 2013, 07:33 AM »

Sorry I'm fairly new to Bonsai and I didn't understand what you mean by "only prune to lignified wood, brown not green"

Lignified wood is brown.  If its still green, its not lignified.  Prune to brown wood.
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Chrisl
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USDA Hardiness: USDA Hardiness 5b

« Reply #5 on: June 18, 2013, 10:10 AM »

Could be scale too, my small Itoigawa is just getting over a bad infestation.  Same yellowing.
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richjay
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« Reply #6 on: July 10, 2013, 09:14 PM »

Thank you for all of the great advice.  Grin
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VanceWood
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« Reply #7 on: December 04, 2014, 08:12 AM »

Scale could be the problem but spider mites generally cause the tree to turn greyish in color.  Put  a piece of white paper under the branches and with the flat of you hand kind of spank the foliage pads.  Look at the paper with a magnifying glass.  Do you see some dust?  Look at that with the magnifying glass; does it move?  If it does you have spider mites. 

Personally I think you are having a watering problem.  Your soil is not operating correctly.  The tree is either drying out and staying that way too long or it is sitting in soggy soil.  The results are the same both ways.
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