bekindbud
Well-Known Member
Got this out of marijuana Horticulture Growers Bible by Jorge Cervantes
Powdery Mildew (PM)
Identify: First indication of infection is small spots on the tops of leaves. At this point the disease has been inside the plant a week or more. Spots progress to a fine, pale, gray-white powdery coating on growing shoots, leaves, and stems. Powdery Mildew is not always limited to the upper surface of foliage. Growth slows, leaves yellow and plants die as the disease advances. Plants are infected for weeks before they show the first symptoms.
Control: Cleanliness(Keep your grow rooms clean)! Prevent this mildew by avoiding cool, damp, humid, dim grow room conditions, as well as fluctuating temperatures and humidity. Low light levels and stale air affect this disease. Increase air circulation and ventiliation, and make sure light intensity is high. Space containers far enough apart so air freely flows between plants. Allow foliage to dry before turning lights off. Remove and destroy foliage more than 50% infected. Avoid excessive nitrogen. Copper and sulfur-lime sprays are a good prophylactic.
Biological Control: Apply Serenade http://www.serenadegarden.com/labels-msds/rtu-label.pdf
Its not too late but you need to start treating it immediately....Yes they sell it at hydro stores, I would highly recommend you get it today and apply today! You really need to get dialed in on your enviroment control....How to you vent your grow area? What is your rH%? Do you have stale air? Also check your Veg area too, you can have PM in your veg area and spread it to your flowering area. You need to make sure you got good ventilation in both areas! I would also recommend you take all your plants out of the veg and flowering area and clean everything with bleach water (ratio 5% Bleach to 95% Water) wipe down everything. Keep a eye out for new spots...your plants can be infected and not show any signs for a week or two....
Here is how I use Serenade....
Take plant out of grow area from the lights and completely spray the whole plant, make sure you spray under all leaves and stalks too...Keep in mind this shit stinks like rotten vinegar!!!
After you sprayed your plant completely, put a fan in front of it to dry the plant up and then you can put back into the grow area. Just make sure you dry the plant before putting it under the lights again.
If you want to dillute the Serenade with some water its fine but I spray straight form the bottle on to my plants...Its still early in flowering for you so it should be safe, you can also spray a lower branch to see if anything happens before spraying the whole entire plant...
Hope this helps bro, just got to get rid of te PM!!!! It will wipe your grow out!!!!
Peace
BKB
they have been getting all the same nutes, with the addition of cal-mag finally. gave them water the calmag and some stay green today. 
. I wasn't able to get the Serenade, but had some Green Light fruit tree spray and used that. Didn't work very well and it had a lot of other probs like chunky white shit coming out in the water. I have too many other things going right now, so she had to go. Bummer too, I was looking forward to some straight sativa.
