[CH] white spots on leaves
Margaret Lauterbach (melauter@earthlink.net)
Fri, 21 Mar 2003 10:51:38 -0700
I agree, Rob. There may be white spots because of water spots left on the
leaves by sprinkling or dew, acting as a lens burning into the
chlorophyll. It is damage to the plants, but we'd hope not serious
damage. Margaret L
John,
The spots you describe still looks like sunburn to me.
Its caused by the UV light the first time plants get into the sun.
The weather in Holland has been very sunny for the time of the year and so
plenty of UV in the air.
But normally doesn't happen when there is glass in-between which blocks 90%
of UV, but perhaps your greenhouse has Plexiglas (unbreakable) windows which
is a good transmitter for UV wave length.
Just my two cents
Rob NL
- ----- Original Message -----
From: "John Clark" <john@callcentrevoice.com>
> the plants have white, paper-thin patches on some leaves. There appears =
> to be no pattern to this, and none of the plants seem worse for it. =
> I've picked off the worst affected leaves, but on some it's a speckled =
> effect and on others it's at the tips of the leaves and in some cases in =
> the middle. Strange. I firstly thought about the sun, but it's March, =
> it's Scotland and we don't get too much sun. Can anyone suggest what =
> this might be and what I can do about it?
>
> All the best,
>
> John