Hello GroErr. I'm new to rollitup, but have a few years of growing for personal use under my belt. I recently moved to a part of the country known to have problems with spider mites so I'm dealing with them for the first time on this grow. I have a small handheld lighted microscope I use to check trichome development and leaf health. Imagine my surprise when I came face to face with the "borg" as they call spider mites here. There are lots of commercial growers in this area, and I'm certain I unwittingly picked up the nasty little bastards from some clones I bought from one of them. Lesson learned! After asking several growers in the area as well as searching another forum I'm active on I decided to give Azamax a try. Azamax is one of the only, if not the only, miticide permitted under my state's medical growers' guidelines. Azamax is derived from neem, and rather than poisoning the mites, it covers their bodies and basically suffocates them. I hope they suffered horribly as a consequence and subsequently rot in hell!
I diluted it down per the instructions, put it in a bottle that has a directional tip (insert joke here), waited for lights out, and gave good coverage first on the bottoms of the leaves by pointing the spray tip up, then came at them from the top down. It took about 24 hours to see no signs of living mites. I repeated the process again after 5 days, then again after another 5 days. My scan this morning was all clear, no signs of mites. As you noted, you MUST spray a few times at 3 to 5 day intervals to beat them at their life-cycle.
In addition to the spray, I have a small, low-power shop vac that I used to vacuum the leaves and buds the day after spraying. Mind you I have been very gentle with the vacuum, being careful not to let the buds get sucked into the hose in the process. I learned this trick in another forum and like the idea of combining the neem with the mechanical removal of some of the mites. It's a multi-pronged approach which is sometimes necessary to deal with particularly aggressive predators.
I was VERY reluctant to spray anything at all on flowering plants, but after much research decided to give it a try. After reading what some other growers use (pyrethrin, kill strips, sevin, etc) I figured I'd probably unknowingly smoked and eaten pot in the past with far worse than Azamax on them.
At harvest time, I'm going to give them a good rinse in the shower before hanging them to dry. The rinse may not do much, but I'm hoping to remove as many of the dead mites, their poop, and their shed exoskeletons as possible before smoking or cooking my buds.
If not for your infestation your plant looks like it would be really nice. If you can't save it at this point maybe you could take a clone or 2, and turn the rest into bubble hash. At least you'd get something out of it?
On a separate note, are you growing your plant in a toilet? I have to admit I've seen some creative things over the years, but that's a first!!