Root aphid damage?

Can anyone tell me If the white is a result of root aphids? They are present but idk if the two are related

Looks like some sort of fungus, did you overwater plants?

Keeping soil wet all the time is bad news

Well the white isn't related to the root aphids IMO. Powdery Mildew and other molds and mildews can grow on your soil if it's too moist all the time. PM loves the acidic soil.

Also, the "filler" used in several WP products will collect and look like that after a root drench. So if you were fighting the root aphids with BotaniGard 22 WP for example that would explain the white residue. Closer examination under magnification would be required to see if it looks fuzzy like a mold or mildew.