"Gofer" wrote in :

Dear members,
I live in Israel, in a penthouse, full of sunlight. I have many pots
with various plants: palm trees and citrus, seasonal flowers, like
penies and gotetia, and vines like passion frut. Some month or two
ago, just between the spring and the summer, many of my plants got
discoloration on the leaves: the smooth green leaves started to
yellow, but not in a smooth way, but rather in an inhomogeneous way. I
am attaching a photograph of a leaf. If you know what might cause the
change, and what is the cure, please help. Yours,
Y. Gofer


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Often this type of discoloration is indicitive of a sucking insect such as
thrips or aphids. Look underneath the leaf for small black specks like
pepper; if you see the specks, that is the insect's excrement.

--
David J. Bockman, Fairfax, VA (USDA Hardiness Zone 7)
email:
http://beyondgardening.com/Albums