The auto blueberry I'm doing in hydro has developed the same white dust with droopy leafs and yellowing after a couple of weeks. The roots look beautiful. The temperatures got to about 85-88 for about 6 hours so it's probably a source. The white powder smells like cheese.

I tried the dishsoap/baking soda/RO water/vegetable oil spray to remedy the white dust and hopefully it will recover but I can't tell if it will help.

Does anyone have any ideas or suggestions?

The PPM is about 200 and Ph is 5.8. I adjust the Ph on a daily basis.