That would be the best guess - overwatering - especially if in self watering containers. Seedlings shouldn't ever be left standing in water or prevented from drying out a bit as is only leads to root rot and nutrient uptake issues. I'd suggest you post this over on the Growing Tomatoes forum here since they have their own forum and include all the info you can about the potting mix used and what if any fertilizer you have given them. Dave

Definitely not any post emergent herbicides used around here. I have very lush gardens in the back yard where these tomatoes are located and no lawn.....just mulch in the pathways. I live in a rural area with no neighbors and no farms within at least a couple of miles. So there is no possibility of any 2,4-D, although I agree that the damage to these plants certainly does look like the ones I have seen on-line of herbicide damage. This is the first time I have ever used Preen. Trust me....I will never use it again. I have koi ponds and didn't even realize until I put it out that Preen is VERY toxic for fish. Luckily all of my ponds are raised slightly so water can't run off into them from the yard. I am sort of afraid to try flushing the bed too much....it's uphill from one of the ponds and I am a little nervous about the contaminated water running towards the pond even though it's unlikely it could run in. I am usually so much better about reading labels. I can't imagine why I even used this stuff!

"There is no such forum. there is a Tomato Forum ,there is a Pest and Disease forum ." Ahhh. But dickiefickle, as homend and booster say, there is a forum specifically for Tomato Pests & Diseases: Unfortunately it is not very well visited since many people post their problems in the main forum. Betsy

it is in a container. I said I spray regularly because I had flies that came regularly to invade the plant.I have tomato dust, Yates prytherum spray and a Eco oil botanic oil that is to be diluted with water. I dont use them all at once only when i see flies I live in Adelaide. Its just started Spring here and for the last week it was raining and extremely windy like crazy and thats also the reason why the stem got blown off and broken. but the wheather is now sunny and warm like spring. I checked the humidity yesterday I think its been around 80-90% these days. I have been growing this plant for almost 1 and a half years now. I didnt know how to care and in first half year of planting it almost died on me because i didnt drain out water and didnt feed much fertiliser and the soil was always wet almost drowned it. I did have fly pests problems before but its now getting better (only a few will come around, so i dont think this condition is caused by the flies). For the past half year its been healthy and green but now is getting sick. I did some research and now I keep it well drained by putting a pot feet, regular tomato fertiliser (to increase nitrogen as I didnt feed much anything before). seaweed solution just added yesterday. I fertilise every 10-14 days. I water when the soil down 5 cm is dry to touch. Water til water comes out of drainage hole. For the stem, I guess I have to cut it off, the leaves now looking very curly. Can I use it to clone another plant??? My current plant stem is not straight i guess the seeds were crowded and no space when i first put them.. Thank you for reading this long reply. I just cant figure out what is the disease causing this problem. Susan Here is a link that might be useful: