You may want to look up Downy Mildew of Impatiens. It's a well-known disease which appears to be running rampant in many locations all over the world, including the US. I don't believe that it has been reported in Georgia yet, but it might be worth contacting your local extension office for some advice. With this serious disease on the radar, perhaps someone will wish to collect some samples for testing. Please know that I am NOT suggesting that your yard is a hotbed for downy mildew! It's simply that this disease is becoming quite widespread and may change the look of our shady gardens in the near and far future. Here is a link that might be useful: Fact sheet

IÂve been growing impatiens about 10 years and still consider myself a novice with starting them from seed. So, in saying that IÂve noticed a few things 1. The double impatiens (carousel is a double, I believe) have much smaller seed and in my experience I have a lot more difficulty germinating. I am not sure for the reason for this, but the doubles were the first I tried, and was heart broken when I got (not to scare you) about 20% germination. Again, this was probably over 10 years ago  things may have changed germ rates  I hope are better. I now grow the Envoy series and get between 95 and 100% germination (these are NOT doubles and have much larger seeds). 2. The moister the better  not WET but moist. I found the longer I kept the dome ON the better off I was. I use domes when I do cuttings as well  and IÂve done MUCH MUCH BETTER. 3. In my experience I have found that they like to germinate at a little bit cooler temps IÂd say closer to 68-70? I donÂt even use a mat on them anymore - ! so regular house temperature works great for them. All this being said, this is my first year doing the new guineas  so I will be sure to pay close attention to this thread. I donÂt have any opinions about the seed starting mixture (I have always used a germinating mix) and that certainly COULD BE what is affecting your germination rate. I donÂt know Although, I do have an opinion about looking at where the seeds are from and under what situation/environment are/is optimal. I find that to be TOTALLY the case  and treating seeds differently based on this in my opinion an excellent practice. Nature knows best  and unless you keep this in mind germination failure is highly probable.

Are they under a tree? Some trees drip sap or honeydew from aphids. Are there other plants that have the same problem. The dry leaf tips could be from dry air or not enough water maybe.

Wild guess, but the super small white dots could be the feeding injury from thrips. If they aren't on the bottom of the leaves they can't be whitefly, so probably thrips. Just a guess. Pix would be good. Hortster