Help I am loosing my crop!

I have been growing for a few years and using Northern Lights and White widow. My mother plant just keeled over and my newest clones are starting to show the same symptoms. First the top leaves appeared to be slighty burned. Tips were browning and the slowly curling from the sides in and dying. It started at the top and slowly the rest of the plant just wilted and died. I do not see and pests and I have flushed the growing medium to clear of over or under nutrients. Added a nice broad spectrum fertilizer. The smaller clones were repotted to sterile soil. I was wondering about a virus or am I just missing something obvious?

 

not sure island girl, but if you haven't check - http://www.overgrow.com/edge/showthread.php?s=&threadid=502075 - otherwise i'm sure someone else will be along soon who'll know

 

--Fukt up..! -What did you do diferant? -I dont know anything about soil but it shure seems that its something that started since your newest clones started developin. -Do your clones share nutes with mom? and If so, did the problem come on at the same time that you changed something only for your last set of clones and mom? --Tryin get some pics up. -Theres nothin worst than a threat on your mother. -Real nerve rackin! -Get some pics up and some of the dirt Folks'l pick this up! -All the best!

 

sounds like your ph is too acidic.
can you tell us more
did overgrow help?