Encarsia formosa (parasitic wasp)


Pack size:

  • 10 cardboard strips each with 5 cards wrapped in a box
    Contains: parasitized whitefly pupae, from which hatch 3,000 parasitic wasps
  • For applications where more points of introduction are needed, also cards with half dose are available: >30 wasps from a card

Glasshouse whitefly (Trialeurodes vaporariorum) and tobacco whitefly (Bemisia tabaci) in the third and fourth larval stage. Preference for the glasshouse whitefly.


EN-STRIPratem²/unitinterval (days)frequencyremark
curative light3-6/m²500-1,0007min. 3xrelease until control is archieved
curative heavy9/m²3307min. 3xrelease until control is archieved



  • Open package carefully inside the greenhouse
  • Bend strips and tear off. Start tearing opposite hang-up hole
  • Suspend the cards in the crop, if possible approximately 75 cm under plant head. Not in direct sunlight
  • Do not touch the pupae

Environmental conditions
The 24 hour average temperature in the greenhouse should be at least 17°C/63°F. At lower temperatures it is recommended to use the cards with half the amount of pupae.

Storage and handling
Biological beneficials have a very short life expectancy and therefore need to be introduced into the crop as soon as possible after receipt. Storing them for a period can have a negative impact on their quality and is only possible under the conditions described below. Koppert B.V. is not liable for any loss of quality if the product is stored for longer than recommended and/or under incorrect conditions.

  • Storage after receipt: maximum 1-2 days
  • Storage temperature: 8-10°C/47-50°F
  • In the dark


  • The black (empty) pupae remain on the card after hatching
  • Intensive deleafing (in tomatoes) hinders the population build up of whitefly parasites


  • Female adults: size ± 0.6 mm, black head, black thorax, yellow abdomen
  • Other stages: develop inside host

Mode of action
Female adult parasitic wasp parasitizes the larva of the whitefly. Host feeding also takes place.

Visual effect
After 2-3 weeks, the first parasitized pupae can be seen in the crop. Parasitized pupae of Trialeurodes vaporariorum and Bemisia tabaci turn black and light brown in colour respectively. The adult parasitic wasp emerges from the pupa through a round hole.

The introduction rates of this product should be adjusted to the mode of action of the product and the results that can be expected in the crop where the product is applied. Your local Koppert consultant or recognized distributor will be able to advise you further.

Only use products that are permitted in your country/state and crop. Check local registration requirements.
Koppert Biological Systems can not be held liable for unauthorized use.


Please contact your local consultant for further application information.

Side effects EN-STRIP

More information?