I'm wondering what's causing the leaves of my morning glories to turn yellow and develop black/brown patches, along with what looks to be like white mold, as shown in this photo:
This is worse in the cotyledon leaves, but I did notice some true leaves having these as well, as shown here:
Something else I have noticed is that a couple of vine ends have turned brown. Also, some of the leaves that are not yellow do not look very healthy. Specifically, they appear bumpy with a very slight yellow-green tinge - not bright green and smooth. Both of these characteristics are shown in this photo:
Finally, I found some of these bugs hovering around the soil. They look like fungus gnats:
If this is correct, then I'm wondering if my plants have a fungal disease, as I read that fungus gnats can spread these diseases. But I'm not sure what disease this is. I have always kept these plants outdoors and for now, I just trimmed off the bad leaves. Does anyone have any ideas of what it might be, and how to treat it?
This summer was my first time trying to plant morning glories from seeds. This is already my third try (the other two times I had some kind of pest eating up the plants). It has not been easy! Any advice is greatly appreciated.