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loss of color on plant leaves

Subj:   Re: A Question for the Experts
Date:   05/30/97
To:     OGL@LSV.UKY.EDU

I have a question for the experts...........
While growing my veggies from seed under the lights in a very controlled
environment, I have experienced a phenomena that is puzzling. My tomatoes (4
different types) and basil (2 different types), although of good size and
with many leaves, have begun to turn white. It appears that the loss of green
coloration begins at the middle of the leaf and spreads outward to the tips.
The appearance is of a powder on the leaf surfaces. Eventually the leaves
wither and die. I use lots of Sylvania Gro-lamps and have the plants at the
recommended distance from the lamps. I have used a recommended dilution of
Alaska fish emulsion as a fertilizer and do not overwater. Now the strange
part. All of my peppers, squash, cucumbers, melons, etc. have not been
effected and they are within inches of the affected plants. Any ideas?

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