Phytoseiulus persimilis


Persimilis Information

These are live insects and MUST be shipped OVERNIGHT. No USPS or ground shipping.

Target pests: Two-Spotted Spider 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. 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. Predator mites are harmless to plants and other beneficial insects and provide a quick, cost-effective solution for spider mite control.

LIFESPAN: 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.

RELEASE RATES: *Note: These rates are for preventative control only, multiple releases and/or higher quantities are necessary for heavier infestations. Click each product pic to get more information about that product.

500 1,000 sq. ft.
1,000 2,000 sq. ft.

Release Instructions for Persimilis

Once you arrive home with your persimilis, you must release them immediately. Persimilis cannot be stored. Because of its high reproduction rate, persimilis usually exhausts its food supply and eventually dies out. Therefore, repeated introductions are recommended until all sites with spider mite infestations have persimilis present. General rates are 5 insects per square foot. Persimilis is available in a granular carrier (usually vermiculite) or on bean leaves. Persimilis in vermiculite are available in high density mixtures and low density formulations. Low density formulations are only for use before spider mites are detected in the crop.

Once spider mites are detected it is essential to establish predators as soon as possible by introducing Persimilis either on leaves or in the HOTSHOT formulation. 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. 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.