03-27-2017, 01:27 PM
You probably have fire ants on those plants. They "farm" that white stuff, aphids and mold. It's a big food source for them. I had it bad on some foxtails. I sprayed with liquid copper and sticker solution and treated for the fire ants. No more mold, aphids or that nasty "white stuff".
Puna: Our roosters crow first