ICMag with help from Landrace Warden and The Vault is running a NEW contest in November! You can check it here.
Prizes are seeds & forum premium access. Come join in!
Vinegar
The acetic acid in apple cider vinegar is very effective in killing powdery mildew. Take care to not make the mixture too strong as the acidity of the vinegar can burn plant leaves.
Mix 4 tbsp. of vinegar (5% solution) with 1 gallon of water. Reapply every three days.
Baking Soda
Baking soda has a pH of 9, which is very high! Treating with baking soda raises the pH level on the plants and creates a very alkaline environment that kills fungus. There have been mixed reports of success when using baking soda to treat severe cases, so it may be better as a preventative treatment than a fungicide.
How to Use:
Mix 1 tbsp. of baking soda and 1/2 tsp. liquid hand soap with one gallon of water.
Spray solution on affected leaves, and dispose of any remaining solution.
Do not apply during daylight hours. It may be best to test one or two leaves to see if the solution will cause the plant to suffer sunburn.
Another reason to start from seed. PM is common....better to have PM than bring in pests. Good luck.
I wouldn't even bring that shit into my grow. Not worth the trouble. I would take them back to where you bought them if that's possible and I would ask for my money back. Otherwise I would double bag those things and throw them in the trash.