outdoor plant stem problem- need advice!

:wtf:Need help identifying problem and possible solution for stem deterioration in outdoor garden. Is this canker, rot, mold, or something that is that just happens occasionally to big plants in a dense garden? See Pics
Mostly on Super Siver Haze :rasta:

I'll let you have this and see if you can diagnose yourself

Nutrient Disorders in Marijuana Cannabis Plants

And fill this out while you're at it if you can't figure it out

http://boards.cannabis.com/plant-pro...anted-one.html