Powdery mildew,lower the humidity,increase airflow..Next time grow strains that are mildew resistant.....This works also :http://www.pioneerthinking.com/tv-mildew.html
What ever it is bro.... check this outSpider mites?
i was looking more in to our problem and it seems to be called downy mildew. it grows in temps less than 76 and humidity above 50%. jorge cervantes says to apply serenade. its available at most stores with a garden supply. he also says its often fatal![]()