[TriLUG] Really OT: maples turning yellow

[John Riselvato]

In the chapel Hill area i am experiencing the same thing. My back yard is
starting to fill up on yellow leaves, I actually just started to notice this
today.

On Wed, Aug 3, 2011 at 11:49 AM, Joseph Mack NA3T <jmack at wm7d.net> wrote:

> This perhaps be answered by people living in or visiting the Blue Ridge
> area...
>
> In the last 2 weeks, with the temps in the high 90's or above, the leaves
> on the maples on the American Tobacco Trail, where I ride my bicycle, have
> started to turn yellow and fall. None of the other trees are doing this.
>
> Since it doesn't get cold here till Oct, the trees still have 2 months for
> growth. It's hard to imagine that right now any living thing would be
> preparing for winter. Two reasons why maples might be shedding leaves.
>
> o the leaves are triggered by photoperiod. We're getting a 14hr day now. If
> maples are genetically optimised for living at 50-60degN, then a 14hr day
> would occur in early Sep.
>
> http://en.wikipedia.org/wiki/**File:Hours_of_daylight_vs_**
> latitude_vs_day_of_year.png<http://en.wikipedia.org/wiki/File:Hours_of_daylight_vs_latitude_vs_day_of_year.png>
>
> when it would be getting quite cold.
>
> o the maples, not being designed for heat, are shedding leaves to conserve
> water, and are not responding to photoperiod. In this case maples at the
> same latitude, but in cooler or wetter environs, eg higher elevation (the
> mountains to the west or in VA) would not be shedding leaves.
>
> Anyone know if in the mountains, maples started turning yellow 2 weeks ago?
>
> Joe
> --
> Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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