predatory

What and when and why? I have an organic grow going, young plants still, and want to be a step ahead of pests and fungi thanks in advance to all who reply

Hello! I'm in the beginnings of a spider mite issue, and considering predatory spider mites. A local place stocks Phytoseiulus persimilis and Neoseiulus californicus. A sentence in the description of californicus caught my eye: "Californicus is able to survive well even at low prey densities...