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Are you sure that there were no other avenues of introduction? I've used Foxfarm for years with no problems, but have gotten mites by bringing in plants from friends, having friends over etc.

Beauvaria Bassiana is a beneficial fungus in Botaniguard. Works well

What's the humidity in the room, and temps, and lighting?

Check out the Solatel 12 burner. Puts out 40 cubic feet per hour and can be air cooled. http://www.solatel.com/

Here are some other Masterful Commercial Grows:

Check out these before and after pics. I'd like to do a side-by-side with compost tea as well.

All I have to do is buy this stuff and I'm a GRAND Master....HA...

Grower on GrassCity: Cannablog: Wikipedia:

Interesting, I think I have encountered them. My circle of friends had this mysterious problem that we considered "Rust" which would usually cause problems mostly in flowering. Shriveled up and dusty growth starting at the bottom and moving up. We suspected deficiencies and fungus, but not...

The Veg looks healthy though...

I would consider 50 Degrees to be the absolute minimum acceptable low temperature for a greenhouse grow. I would look into a portable propane heater with thermostat.

You spelled "their" wrong in your signature. Also forgot to pluralize "horticulturalist".

I thought I was a master once. When that feeling wore off, I continued working to produce the most consistent, efficient, quality harvests that I could. Comparing myself to all of the best posters and bloggers, I did better than some, and worse than others. Still I am not a master...

The organocide thing might be a slight issue, but maybe not. I've noticed necrosis similar to this from pyrethrum oil that is a bit harsher on plants. After a spray or dip, if there is oil redisue on the leaves (not just film, but shiny deposits) it can burn the leaf margins. A good way to...

I like the homemade bamboo trellis ;)

Still, think about cooling options other than exhausting the air. Even with air-cooled lights, you might get hot in the summer time if you're running a CO2 unit and dehumidifier. Air conditioning is the best bet in this scenario, ideally a split system so you are not losing gasses or smells...

Interesting. This brings up the idea of food for bennies in cultures and in soil. Consider yogurt, a bacterial culture that feeds off of proteins, same with cheese. Now consider the idea of adding carbs to compost teas to produce large colonies of Bacteria. Both of these are food sources...

I agree about upping the dosage. On the feeding schedule, it's 1/2 tsp per gallon for the Microbe Brew and 1/2 to 1 tsp per gal of Kangaroots, but I'm going to up the dosage of Kangaroots first then maybe Microbe Brew to see if there is even more of an advantage. They're pretty cheap, so 2.5 - 5...

Also consider drainage. Gravel with radiant heat and a good drainage system is costly, but effective. You don't want a bunch of puddles and mud in your greenhouse.Also, If your root temps are OK in early spring, then you can run a cooler temp in the greenhouse...

Are the lights on 24 hours? What is the dark cycle temp? I second the foliar feeding with Nitrozyme as well...