I love when things all seem to work out for a reason. A couple weeks ago, I left my seedlings outside to get some sun, and by the time I got back, the temperature had dropped significantly. A few days later, I noticed that some of the leaves seemed to be damaged.
I did a bunch of research on what cold damaged tomato leaves would look like, and couldn’t find much specific to my situation; but in my research, I came across a photo of what happened to one of my tomato plants last year. This was very good, because it turns out what I thought was aphid damage really was verticillium wilt which is a fungus that lives in the soil. I discovered this in time to avoid planting in the affected containers, and now have to disinfect them and throw out the old soil before putting my new seedlings outside. This is a major pain, because I am not sure how it got into my garden in the first place, so I am not sure how many of the pots need to be started over again. That being said, I am glad to be doing this work now as opposed to later after all my tomatoes have died.