Amblyseius andersoni - FAQs

Why use A. andersoni before I even see spider mites?
Spider mites multiply fast in warm weather, and by the time you see stippled leaves the colony is established. A. andersoni can live on pollen until mites arrive, so releasing early puts predators in place to catch the first colonies.

Will A. andersoni clear a heavy spider mite infestation on its own?
Usually not. It's built for prevention and small colonies. For heavy pressure or heavy webbing, add Phytoseiulus persimilis or Neoseiulus californicus and bring numbers down with an IPM approach.

Can I release A. andersoni in fall or winter?
As days shorten in early fall, A. andersoni can go dormant and stop hunting until temperatures and day length improve. For fall releases, a warm, well-lit greenhouse or grow room is the best fit.

Can I use A. andersoni with neem oil or insecticidal soap?
Not while predators are present. These products can kill predatory mites through direct contact, and some treatments may remain harmful after the spray has dried. Check which chemicals are safe for predatory mites and observe the recommended re-entry/release interval before introducing predators.

Are A. andersoni predatory mites safe for people, pets, and plants?
When used as directed, yes. A. andersoni isn't known to bite people or pets, and it doesn't feed on plants. It eats small pests and pollen, and its numbers fall once food runs out.