Pest/bug control in those massive warehouse grows?

Was wondering how they control this or solve once the mites hit? Seeing a few warehouse grows going here in Washington. Thanks

Ive never done an ultra massive warehouse grow as large as the cali growers but mine woulda classified as a warehouse grow, at its largets i had 8 seperate 4ft x 8ft flood & drain tables with 50 sog plants per table , i kept 12 sativas in a soil grow area as well as 8 to 10 large mothers , in total i ran right around 500 plants in that building & it was as large as any 1 man could properly look after , when you get mites in a very large grow treatment is the same as small grows with the exception of how you apply pesticides , in my case using a little old spray bottle took days to treat all the plants so i bought a back pack type sprayer & modified it , i modified the spray nozzle to point upwards for getting under the leaves & modified the spray wand by cutting the wand in half , connecting the 2 halfs with 5ft of rubber hose & clamps , then mounting the newly made 5ft long flexible wand to a piece of pvc pipe so i could easily reach the interior of the grow .

I would think most large scale indoor growers are doing something similar .