Garden Pests and Diseases: Fuzzy Mold-like substance on the soil of indoor window box, 2 by AHealy8172

AHealy8172 wrote:
Ok, so here are the pictures. I wish it would allow me to caption them or something, but the photo system seems rather rudimentary, so I tried to upload them in a particular order, but even that didn't work- the photos posted in a different order than I wanted. So. I'll try to explain them in one fell swoop:
I took a close-up photo of two particular clusters of "dust" and then a photo of the same spots, but from a distance, to help give a complete picture. Then, the last photo is of the entire window box. I'm pretty sure the clusters are on top of dead leaves that have fallen, which is why I'm equating the "dust" with some sort of mildew or mold....But I'm up for hearing all your thoughts. Thanks.