Shxxxt!! "Powdery mildew" on my tomato plant...

http://www.lfl.bayern.de/ips/gartenbau/06916/

The name of the disease in German: Echter Mehltau (Oidium Cycopersicum)

Homemade organic therapy:

http://www.gardenscure.com/420/plant-nursery/118561-powdery-mildew-info-cause-treatment.html