North American Fruit Explorers mailing list at ibiblio

[Matt Demmon <mdemmon@gmail.com>]

Jay, in my experience, many plants that are adapted to low light
levels and typically grow in shade, whether herbaceous or woody, will
become lighter green, or even yellowed and bleached if grown in too
much sun. I would think the effect would be even worse closer to the
equator, drier, and higher. I'm sure the New Mexico sun is much more
intense than sun up here in Michigan.

That's not too say that the plant won't fruit more and grow more in
the sun, it just doesn't look as healthy.

-matt
z5 se MI

On Wed, Jun 20, 2012 at 7:20 PM, Jay Cutts <orders@cuttsreviews.com> wrote:
> Does anyone have any ideas on why the leaves of a tree would become
> paler in the sun than they are in the shade?
>
> I have two small pawpaw's. One is under shade cloth and gets no direct
> sun. It has dark green leaves. The other is not covered and gets full
> sun about half the day. It has very pale leaves. I've seen this a number
> of times with pawpaws. In the shade the leaves are dark green. In the
> sun, they are pale.
>
> We're in New Mexico at about 5500 feet.
>
> For a while I was treating the pale plant as chlorotic (which is how it
> looks) and applying iron as a foliar spray and poured on the ground
> around the roots. This didn't help at all. Then I realized that there
> might be a different cause.
>
> Normally, I'd expect a plant in the shade to be paler than one in the sun.
>
> Any ideas?
>
> Regards,
>
> Jay
>
> Jay Cutts
> Director, Cutts Graduate Reviews
> Lead Author, Barron's MCAT Prep Book
> Lead Author, Barron's LSAT Prep Book (2013)
> (505) 281-0684
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>
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