Encarsia formosa

Encosia formosa parasitoid of whiteflies


Encarsia formosa is a parasitic wasp that parasitizes whiteflies like greenhouse whiteflies (Trialeurodes vaporariorum) and whiteflies of the genus Bemisia.I was the first biological control agent developed for use in greenhouses. Adults are black with yellow abdomen, measure less than 1 mm long. This miniscule wasp lays its eggs in immature whiteflies (third and fourth larval stages), with females laying 50 to 350 eggs in their lifetime. Larval stages live entirely inside immature whiteflies, which darken and turn back as the parasite develop inside

Produced by the Canadian insectary Applied Bio-Nomics, Encarsia cards are nor refrigerated. Non-refrigerated wasps gives better parasitims rate and a better area dispersion (= more effective).


This product can be purchased on our online store for producers under 2000 ft2 or residential. For a commercial purchase (2000 pi 2 and more), contact us.

Targeted crops

  • Market garden crops (tomato, cucumber, pepper, eggplant, etc.)
  • Ornemental plants (poinsettia, gerbera, etc.)
  • Indoor plants

Targeted pests

  • Greenhouse whitefly (Trialeurodes vaporariorum)
  • Whitefly Bemisia sp.

Life cycle

  • Encarsia formosa has a life cycle of approximately 28 days at 21 °C.
  • The optimum conditions are a temperature above 20 ° C and a relative humidity of 50-70%.
  • The females lay eggs in 2-week-old whiteflies (third and fourth larval stages).
  • Females lay an average of 10 eggs per day for a total of 200-350 eggs in their lifetime.
  • At the adult stage, Encarsia formosa can live from a few days to a month, depending on the temperature.
  • Parasitized whitefly pupae blacken after 10-14 days. The new adult emerges after 2 weeks.



  • AB014 - Encarsia formosa - 1000 pupae (10 cards)


Encarsia pupae are sold glued onto cards and adult will emerge over a period of 1-2 weeks at 20-25 °C. Generally, emergence is fast (2-5 days). Small emergences holes in the pupae are visible using a 5-10 X lens and indicate that the parasite has emerged. For application, hang the Encarsia card from lower leaves in the shade as Encarsia tend to fly upward; avoir wetting them while watering. Do not attemp to use Encarsia if high whitefly populations are already established.

Introduction rate
Introduction Quantity Surface Frequency Duration
Preventive 1 per m2 weekly or bi-weekly 5 introductions in total
Curative light 5 per m2 weekly when over 80% of the
whiteflies have been parasitized
Hot spot 10 per m2 weekly when over 80% of the
whiteflies have been parasitized
Maintenance 1 per m2 weekly as needed

Product data sheet(s)

Fiche signalitique
Encarsia formosa technical sheet

Additional information

  1.   - Encarsia Technical Manual (Applied Bio-nomics Ltd., 2018)
  2.   - Encarsia formosa (Applied Bio-nomics Ltd., 2014)
  3.   - Biology and use of the whitefly parasitoid Encarsia formosa (Annual Review of Entomology, 1998)
  4.   - The parasite-host relationship between Encarsia formosa (Hymenoptera: Aphelinidae) and Trialeurodes vaporariorum (Homoptera: Aleyrodidae) (Journal of Applied Entomology, 1980)
  5.   - Age-Specific Interaction Between the Greenhouse Whitefly and Encarsia formosa: Influence of Host on the Parasite's Oviposition and Development (Environmental Entomology, 1977)
  6.   - Biological control Encarsia formosa (Cornell University, 2018)
  7.   - Whiteflies in Greenhouse Crops - Biology, Damage and Management (OMAFRA, 2016)

Targeted pest

Targeted production

Recent news

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