Mold or Mildew?

I am 35 days into flower. I noticed a white powder like substance on some of the top leaves on one strain and on the bottom of another. I am about 2 weeks from harvest and i don't want it to be something that can hurt my plants.

I keep the room below 50% humidity as much as possible and temperatures stay between 73-75 F.

I am grateful for any help anyone may have.

Random arrays of that stuff might indicate mold, cant tell unless im lookin at it irl for certain. if it starts from top to bottom or vice versa then its prolly a nute issue... its powdery? rub some between your fingers maybe its resin

I looks like mold from those pics but a closer shot would help. If indeed it is mold it is a bad case of it. I have never tried to get rid of that much at once before but you might try hydrogen peroxicide or baking soda solution........peroxcide I would dilute it down to about 4 to 1 and spray, baking soda is about 2 tbls in an hand mister bottle. Basically what this does is to alter the ph of the mold and kills it without harming the plants. Of course try this on a small affected area first, like one or two leaves and check your result. Hope this helps.

I talked to my mentor and he told me what the problem is. The white spots are Powdery Mildew (PM). If PM is found on your plants in your vegetative state or early in the flowering phase use a sulfer burner to get rid of the problem.

Since I am 2 weeks from harvest I am not able to use a sulfer burner. The solution I was given is to spray the plants with PH balanced water and a cap full of hydrogen peroxide to 1/2 gallon of water.

After spraying use a wet paper towel (I used the same peroxide water) to gently wipe down the PM from all infected leaves.

Since PM mainly only affects the leaves (resin glands protect the buds) you may not loose any of your crop if taken care of immediately. However, since mainly the leaves are affected, almost all of the infection will be taken care of anyways with the trimming process. But that is no excuse to ignore the problem.

I hope I can help anyone who reads this. Pay it forward.