Stan Goodman said:
On Tue, 31 Aug 2004 10:17:14 UTC, (Pat Kiewicz)
opined:
Leaf miners. An insect larva that grows inside of the leaf.
There are leaf miner parasites available to control them in
greenhouses. Neem extract (azadirachtin) is often recommended.
I don't think that's all that is shown in the pictures. I see the miner
tunnels, but there are also loarge yellow areas that do not include tunnels.
In your middle photo, the yellow areas appear to be connected to sections
of the leaf that have been entirely surrounded by or otherwise damaged by
miners so the yellowing (at least in the photos you posted) is consistant with
leaf miner damage.
--
Pat in Plymouth MI ('someplace.net' is comcast)
Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)