Phytoseiulus persimilis


Case Count: Sold Individually. This item does not qualify for our assisted freight program.


Item Numbers
WPP5C - 500 Mites per Vial
WPP1K - 1,000 Mites per Vial
WPP2K - 2,000 Mites per Vial
WPP10K - 10,000 Mites per Vial

Target Pests:   
Two-Spotted Spider Mite (Tetranychus urticae), Carmine Red Mite and Pacific Mite.

"Persimilis" is a tropical predatory mite that was one of the first greenhouse biological control agents available commercially. Adults are bright reddish orange, with long legs and pear-shaped bodies, 0.5 mm long. Immature predators are a pale salmon color. Eggs are oval and 0.3mm long.
Both adult and immature predators move rapidly over the leaves and both feed on two-spotted mite eggs, nymphs and adults. Unlike its prey, Persimilis does not spin webbing.

Product information:
Persimilis should be applied the same day they are received as the quality fo the product drops with storage. If Persimilis must be stored, hold only at 10°-15°C (50°-59°F). Temperatures above or below that range cause mortality.

Using the Vermiculite Product: 
When Persimilis are refrigerated they tend to clump together. If the package is cold, lay the container on its side at room temperature (out of direct sunlight), for 15-20 minutes to allow the mites to warm up and move apart.
- Check the product by sprinkling some of the vermiculite onto a sheet of white paper; the active predators should be easy to see.

  • Light Infestation: Apply before mites are detected. Gently rotate the bottle to mix the mites with the carrier and distribute the contents over the plants.
  • Heavy Infestation: Apply when mites are detected. Gently rotate the bottle and apply predators to each infested leaf.

A complete life cycle takes from 5 days to 30°C (86°F) to 25 days to 15°C (59°F). There are 4 times more females in the population than males with a ratio of 4:1. Females lay 2-3 eggs per day for an average of 60 eggs over their 35-day lifetime. The eggs hatch in 2-3 days. They are oval and twice the size of two-spotted mite eggs. Newly hatched predators do not eat, but later stages and adults feed on all stages of prey. Each predator consumes between 5-30 prey (eggs or mites) per day. Persimilis does not diapause and remains active year-round in greenhouses.

Strategic Considerations: 
If spider mite numbers are high (there are visible webbing and clusters of mites stringing down from leaves), use a compatible pesticide, such as fenbutatin oxide (Vendex®) or insecticidal soap, to reduce pest numbers before releasing predators.

  •  Persimilis needs relative humidities greater than 60% to survive. In low humidity conditions, raise the humidity by lightly misting plants or wetting walkways.

The pesticide fenbutatin oxide (Vendex®) can be used with Persimlis for additional control of spider mites if "hotspots" develop. It does not harm Persimilis, but avoid over spraying, which reduces the Persimilis food supply and their ability to reproduce.

Spreader-stickers, supreme oils and soaps are harmful to the Persimilis contacted by the spray, but have little residual activity.