Phytoseiulus persimilis is a predatory mite of the family Phytoseiidae that feeds almost only on spider mites in the genus Tetranychus, including the two-spotted spider mite. Adults are bright orange-red, pear-shaped, longer-legged and faster than their prey. They eat all stages of spider mites and reproduce quickly when food is plentiful.
In practice
Growers use persimilis as the knock-down predator for established spider mite patches, released directly on the stippled leaves. It works best in moderate temperatures and at relative humidity above about 60%; hot, dry rooms over roughly 30 °C (86 °F) hurt itbeing reviewed. Because it is a specialist, the population crashes once spider mites are gone, so it is not a preventive choice. A common pairing is persimilis for hot spots plus Neoseiulus californicus across the room for staying power. Avoid broad-spectrum sprays before and after release.
Don't confuse with
- Neoseiulus californicus: a pale, slower generalist that persists at low prey and tolerates heat.
- Spider mites: plant feeders with two dark body spots; persimilis is uniformly orange-red.
- Red velvet mites: larger soil mites, not a biocontrol product.
