for the second year running, i have similar disease symptoms appearing, they are (hold your breath)
leaf purpling/blackening and yellowing !
brown scortched areas (almost dry and crispy)
leaf curling/twisting away from the sun
some plants were so bad i kicked them (not literally!) out of the greenhouse, but they looked as though a sooty black mould was attacking them .
Im at a loss to know if all this is something in the water, a virus, fungus, lack of ventilation. Im pretty sure theyre well fed and watered, but its annoying as the leaves are filthy. They started so well too. They now have 5 trusses and are still growing, but slower than i would expect. The flower trusses are massive (some more than 30 fruits), which suggests the feed and water is getting through well.
Sorry i dont have a picture, i could try putting a small one on the profile if that would help. I know with all those symptoms its like a minefield trying to work out what is actually wrong. If anyone can suggest anything, id be gratefull, and i cannot spray as they are an organic (ish) crop.
The black mould could be a fungal or bacterial attack, and ventilation would help I would imagine. It may be secondary, once the plant is poorly from something else.
Haven't seen anything like you describe, but googled a bit and came up with:
Tomato Infectious Chlorosis Virus
Tomato Curly Top
Septoria leaf spot
All from US sites I'm afraid, but it might help you identify the problem/s.
http://www.ipm.ucdavis.edu/PMG/selectnewpest.tomatoes.html
http://www.extension.iastate.edu/Publications/PM1266.pdf
http://hgic.clemson.edu/factsheets/HGIC2217.htm
http://osuextra.okstate.edu/pdfs/F-7627web.pdf
Black mould usually means aphids are around
Leaf purpling can also be a sign that the plants have weathered a drop in temperatures.
Quote from: Merry Tiller on May 24, 2006, 21:42:18
Black mould usually means aphids are around
Digressing slightly, one of my plum trees was always covered in black mould until I learned to get rid of the aphids early in the year, evidently it grows on the honeydew they secrete.
Quote from: Gadfium on May 24, 2006, 23:04:48
Leaf purpling can also be a sign that the plants have weathered a drop in temperatures.
My aubergines, physallis and some of my chillies now have intensely healthy but purple leaves.
there are a few aphids around, as the staging still has a few hundred pelargoniums underneath the toms, which im longing to get them out.
But ive also seen purpling on parsleys and chervil, and wondered if something could have cross contaminated my crop. The pelargoniums are healthy, hardly a mark on them !
i have had some purple parsley - again i put that down to temperatures though (outside spot, no other symptoms present)