Leaf curling alone is a physiological condition caused by stress; it's common in stressed plants, including young plants which don't have the root system to support all their foliage yet, or in times of unusually bright sunlight. If you get it by itself, look to see what may have stressed the plant recently; often it's nothing to worry about. The wilting, dead green leaves symptom resembles bacterial wilt, but that's pretty rare in your neck of the woods, and tends to take the whole plant down very rapidly. Stem borers can sometimes do it; look for little holes in the affected stems. Look for any damage to the stem, in fact. With the yellowing and necrosis -- it's hard to see in that small a photo, but it looks like the dark lesions are following the veins. That's diagnostic of a toxin of some kind -- no virus I know of does that in tomato, no bacterium or fungus is that specific, and no deficiency kills the veins before the interveinal spaces. I've seen a symptom almost identical to that in a case of alcohol poisoning (someone had a cocktail party in a library foyer and apparently the drinks weren't very good, as the potted plants looked pretty rough afterward). It was an unusual enough symptom that it became a teaching example. Toxins can come from outside or from the soil. Pyola is perfectly safe for tomatoes, and the heat wasn't excessive, but make sure the dilution was correct, as too high a concentration can burn leaves much like that. Spray damage can also cause wilted and dead green leaves. If you can sacrifice a plant that's badly affected, dig it up to look at the roots, see whether it has lots of crisp, white, fine roots, not dark or knobby ones. Shave away the skin at the soil line to look for discolorations in the woody stem underneath; cut open wilted green shoots to check for hollow centers from stem borers; and finally split open the main stem to see whether it's hollow or discolored inside. I don't expect much except maybe root symptoms, but you really never know. My personal guess is soil toxicity, especially given that the lower and terminal leaves are the worst affected by the yellowing and dying, and some things take a while to build up in the leaves enough to kill them. One important thing to note is that not all toxins are synthetic chemicals -- an excess of certain minerals or nutrients can poison a plant. pH affects root uptake of anything enormously, especially minerals, but it can have its own effect as well. You may need a soil test -- call your Agriculture Department, Cooperative Extension, or U of O to find an affordable lab. I don't see your symptoms in any of the common nutrient toxicity listings, though, which means it could be something chemical, and there is no general panel for that. Down here in California I'd send it to Sacramento's Plant Diagnostics lab or the extension pathologist at U. C. Davis, but I don't know what pathologists you have at your disposal. This is certainly not a cut-and-dried common disease problem, and even a specialist is going to need some lab work to figure it out, I suspect. I wish I had more answers for you, sorry. --Alison

I suspect that it is because it is in a pot rather than being a disease. How big is the container? What is the potting medium? And have you fed it? These can grow enormous and in a pot they are going to need a lot of care. If it is stressed by lack of food and moisture, which would be likely in a pot, it could exhibit premature fall symptoms.

I'm a citrus newbie trying to grow a couple of different citrus trees/plants from seed and it's been going rather well so far. I live up north in Sweden so they're just growing indoors and with artificial light during the darker part of the year. My lemon plant have been the most successful one so far, it's been growing steadily the past year and have looked really healthy. A month ago I pruned it and it immediately started to sprout which was my intention. But today I noticed that two of the new leaves had started to crumble and had yellow spots with brown in them. When taking a closer look I find yellow spots on many of the older leaves as well, but they don't look exactly the same. I've tried to compare the spots against images of citrus pests and diseases, but I can't determine myself the cause. Anyone here with more citrus experience who can help me determine what's happening to my beloved plant? The new leaf, it's more crumbled than on this picture: A few of the older leaves with yellow spots:

I agree - many of my roses look like that at this time of year. Not a problem - the leaves have aged naturally, and next Spring there will be new ones. In warm zones sometimes the old leaves stick on, instead of dropping off as they might do in colder zones. OT Digression - here in the US we always call the season after summer and before winter "Fall" (Chaucer used it: "In the Fall of the leaf"). The French derived word "Autumn" is of course used, but way way less. I get the impression that the normal verbal usage in the UK and other British founded countries is Autumn. Funny - sometimes here some older English language usages have persisted, while in England the language has moved on Jackie