I know this is an older thread but I wanted to thank the author...
I just wanted to take a second to thank you my man. You clearly spent countless hours compiling all the photos, text and overall easy to follow information. Man, you know your shit! Your devotion to that wonderful writing you did about the Nutrient Deficiencies as well as pests is very, very much appreciated. Goes to show you that I, of course, learned lots of things. Oh, here's a nifty trick I do for preventative pest control. I grow strictly Hydro, been around for many years. Anyway, I get cheap Cellulose sponges (3 for $) I cut these into like 1-1/2" squares. Then using a paper hole punch I make a hole in the center as best I can, the center of the sponge. Now I take my cuttings that are ready to go into my power cloner equipment, slipping the cutting through the hole. It can sit over the hole the normal neoprene washers occupy. but also ads stability for heavier cuttings. Fast foreword. Their purpose is to become a barrier at the plants base about 1-1/2" above grade. In the event of a mite attack, simply spraying these donuts 2X daily. They migrate and crawl, so they simply loose their food sources. When you spray the leaves, keeps them trapped in the wetness and they cannot run very far either. The sponge material will not pose a problem of chocking the stem as it is really flexible, and wet even more so..
I am always so scarred that I'll over feed, so I tend to be on the lean side of fedings. It's an awful lot of work wither soil or hydro (me hydro)
