Jack Herer white spots, pm..? pic

[BadassBaxter]

she was looking really good until today when I found these small white spots.
I am thinking its PM. Crazy because its so dry here, like 40% RH
Since they are in full flower was thinking I would spray with food grade citric acid, which worked well on a different plant...
Just worried about the buds...

 

[ComfortablyNumb]

WPM. Milk spray.
Since you are well into flower, you don't want anything on them that can mess them up.

1 gallon water,
1 gallon vit D whole milk,
Mix well, spray plants during the hot part of the day.
3 or more daily treatments may be needed. You can rinse the plants before you spray if you like.

 

[PauliBhoy]

Hydrogen Peroxide is another option late in flower. It degrades to water and oxygen very rapidly, leaving no residues whatsoever. Spray in early to mid-morning. I use an organic product called Oxidate that is super H202 but I think you can use the 3% stuff from your local pharmacy at something like a pint up to a quart per gallon.