not sure what these are, as of now they are relatively harmless, plants seem healthy. are they eggs, somekind of buildup from spraying, i have sprayed neem oil, franks base and grow, sum safer brand natural plant spray. any ideas peops?
Did you ever find out the problem? Mine are brand new and have this on a couple of the clones. I am using Aero/NFT. It is gritty and reminds me of a sodium deposit.