Encarsia formosa is a parasitic wasp that targets greenhouse whitefly (GHWF) and, to a limited extent, Bemesia tabaci and possibly other whitefly. Targets 2nd instar of GHWF (scale on underside of leaf). Parasitized scale turn black. Double Encarsia release rates to control Bemesia. Adult Encarsia will also feed on whitefly honeydew and kill whitefly scale through host feeding. Excessive honeydew hampers activity of the parasite, so avoid high whitefly populations. Bring populations down with a soft pesticide, such as Mycotrol O or soap and oil, then release biocontrols. Encarsia are good flyers and will seek out prey, but tend to remain in regions where whitefly are concentrated. Even distribution is important in greenhouses. No diapause but inactive < 54° F. Proactive weekly releases for 8 to 10 weeks recommended for susceptible crops such as poinsettia. Optimal conditions are > 64° F and > 60% RH with bright light. Sold as 1,000 parasitized scale glued on a perforated card (strip) with hooks. Each strip can be separated into 10 tabs with 100 wasps each.

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