health White spots on underside of leaf

[ZerozNoneZ]

Can anyone tell me what this white stuff is? I'm growing indoors with LED lights and CO2 the room is vented and I have osolating fan as well as a HEPA air filter. There's 4 or 5 plants in one pot but only 2 of the plants have the white stuff on them. None of the other plants in the room have this on them either..

Thanks

 

[scrufy]

While I'm sure it could be a fungus it just looks like salts and left over solids after evaporation from your hydro to me.

 

[HotPeppas]

Better be safe than sorry

Couple drops of ivory hand soap to a few cups o' water. Mist good!

 

[rhm3769]

First impression, I agree with scrufy, looks like salts....

 

[Pr0digal_son]

Second pic from bottom shows some edema. First pic is too blurry to see the texture of it. Seems kind of strange considering all the air flow you have going. Keep plants on the dry side. You will be surprised how little water they need.

 

[nitwit]

do you let your kitty cat get near your plants?

maybe a little defoliant spray there from that?

welcome to the asylum

might try to wash that stuff off

edited to welcome etcetera