predator mites

curious as to what the disadvantages of these mites are? specifically the Persimilis

sorry if this has been answered, i checked the google for a while and came up with inconsequential stuff, like the fact that predator mites are easier to kill than spidermites with pest control sprays

regards

.......I would think it to be the fact that they have necessary environmental requirements to thrive and do what you need them to do that are not necessarily good to mj plants. They need hot/humid(+80 + RH65-70+%). They need time(weeks).
Not necessarily true that they are easier to kill than spidermites.....
The problem with most 'pest control sprays' is that's all they do: control