Hey, I use predatory insects for biological controls, all of the time. I specifically like the slow-release packs of "Amblyseius cucumeris." I released another 350insects x12 packs all over my girls, some other plants and within a day, you can see your army mobilizing all over your plants.
They generally feed on thrips, but if they're hungry, they'll eat spider mites and whitefly (plus generally what ever it can get its hands on). They can sustain their life and actually increase it by ingesting pollen. I actually have several pollinating flowers in my grow room for the purpose of stabilizing their populations. Though they have consumed most of the enemies, they are either neither gone entirely, ever. Maybe if you release like 30k of them, then the war would be over.
Though it is rather shocking to see "Stethorus punctillum" at such a low price. They literally make my army look like Ethiopians vs. the Terminator.