Before anyone says anything, i searched and couldn't find anything. I'm having a really big problem with my plants. Outdoor, 5 gallon buckets, about 4 weeks into flowering I'd say. Now the problem is the leaves are turning a rust color (not yellow but rusty) and the plant is dieing from the top down. Yes, top, not bottom. Also, they're drying up and dieing, but only secondaries, the main colas are still intact thus far. Can anyone direct me to a few pictures or whatnot of root bound symptoms? So far that answer is my prime suspect. Trying to get everything i can out of these four but it's my first grow so I'm still learning those simple (yet devastating) mistakes. Edit: It actually looks like fusarium wilt. Anyone know what causes this?