If you've got your scope, then its time to inspect your leaves for pests. if you don't find pests, lots of things cause necrosis. When mine start to do that(usually right after I do a real good flush), I give them a shot of micro nutes(not a small portion of nutes,micronutes).
If you've got no micronute solution, try molasses. it contains lots of the micro nutes.
Zcomp Reviewed by Zcomp on . Small Grow first time All CFL This is my first log and first grow here! Few of them problems i face right now. i'm still in the set up stage and i have to keep this room a secret so its hard for me to work on it. I am going to have 6 CFL going at once. I don't know what is better. a light cycle that is a 24/0 or something like 18/6... power bill is not a problem so id rather go 24 hours if its better. since i took so long setting up my room my plants stretched way out. im wondering if this is going to be a problem for Rating: 5