I have recently installed 3 new raspberry plants. "Williamette" variety.... supposedly not affected by virus. The garden bed is new. The additions to the soil were all first rate materials. This should be a real success story. Now two of the three are showing signs of being infected by something causing brown leaves, almost dehydration syle distress. I am trying to locate the description of the symptoms on the internet in order to determine the causes and cures.... " sounds like a fungus" is about all I'm getting back. Does anyone have an idea? and more importantly a cure?