RE: [IAWA Forum] Needle fleck

From: "Gartner, Barbara" <Barbara.Gartner@orst.edu>
Subject: RE: [IAWA Forum] Needle fleck
Date: Mon, 26 May 2003 22:20:27 -0700

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I've heard about people shaving down the wood to see the needle traces, and to surmise how many cohorts of needles are attached, and I think this reference might be about that:

Pouttu, A. and M. Dobbertin (2000). Needle-retention and density patterns in Pinus sylvestris in the Rhona Valley of Switzerland: comparing results of the needle-trace method with visual defoliation assessments. Canadian Journal of Forest Research 30: 1973-?.

I have another reference that I can't put my fingers on, but they probably cite it.

Barb Gartner

> -----Original Message-----
> From: Lloyd.Donaldson@forestresearch.co.nz
> [mailto:Lloyd.Donaldson@forestresearch.co.nz]
> Sent: Monday, May 26, 2003 7:54 PM
> To: iawa@COF.ORST.EDU
> Subject: [IAWA Forum] Needle fleck
> 
> 
> Dear Colleagues
> 
> I am studying a defect in radiata pine wood which we call 
> needle fleck. It
> is initiated by persistent stem needles causing very small (1-2mm)
> knot-like structures in a spiral pattern on tangential 
> surfaces. In some
> cases these defects are much larger and contain a bark inclusion. This
> defect often persists long after the needles are lost and causes
> significant degrade to clearwood for high value products. It 
> also creates a
> nice figure that wood turners make use of. It may be 
> associated with bird's
> eye (indented growth rings).
> I cannot find any mention of this defect in the text books I 
> have looked at
> so far. I am interested to know if anyone has seen this in other pine
> species or if there are any publications that describe it. Thanks
> 
> Best regards
> Dr Lloyd Donaldson - Microscopist
> Cellwall Biotechnology Centre
> Forest Research,
> Private Bag 3020, Rotorua, New Zealand
> Ph 64 7 343 5581
> email lloyd.donaldson@forestresearch.co.nz
> www.forestresearch.co.nz/mnz
> 
> ======== Welcome All Anatomists! ==========
> About this IAWA Discussion Group, subscribing, unsubscribing, 
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> The International Association of Wood Anatomists
> 
> 

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