Might be helpful? Tell you what. I was able to answer more questions about my sick plants from just looking at that guide, than I did from starting 2 threads with pics and asking for help on this forum.
if you really want to learn about your plants, and what ails them, don't start threads... read them. i'd wager that most, if not all, grow questions could be answered by doing searches and reading. everybody wants the quick/easy fix.......