En-Strip Parasitic wasp Encarsia formosa

Use En-Strip for:
  • Greenhouse whitefly
  • Tobacco whitefly

Each box contains cardboard strips with 5 cards each, wrapped in plastic, with parasitized whitefly pupae.
10 cardboard strips, hatching 3,000 parasitic wasps
50 cardboard strips, hatching 15,000 parasitic wasps

In case more points of introduction are required, half dose cards with 30 wasps per card are available

General information

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When to use En-Strip?

Use En-Strip for biological control of greenhouse whiteflies (Trialeurodes vaporariorum) and tobacco whiteflies (Bemisia tabaci) in the third and fourth larval stage. Use En-Strip preventively and at the first sign of pest presence.

How does En-Strip work?

Female adult parasitic wasps parasitize the third and fourth larval stage of the whitefly. Additionally, host feeding also occurs.

How to use En-Strip

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Application En-Strip

  • Open package carefully inside the greenhouse
  • Bend and tear off the strips opposite from the mounting hole.
  • Suspend the cards in the crop, if possible approximately 75 cm under the plant head.
  • Avoid direct sunlight
  • Do not touch the pupae

Best working conditions En-Strip

Optimal working conditions for En-Strip require a minimum 24 hour average greenhouse temperature of at least 17°C/63°F. At lower temperatures it is recommended to use the cards with half the amount of pupae.


Biological beneficials have a very short life expectancy and therefore need to be introduced into the crop as soon as possible after receipt. Failure to do so can have a negative impact on their quality. In case you do need to store En-Strip, please follow the instructions below. Koppert B.V. is not liable for any loss of quality if the product is stored for longer and/or under different conditions than recommended.

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


The information given below is merely indicative. Tailored advice can be provided if information is available on the local factors that need to be taken into account, such as the crop, the climate conditions and the level of infestation. For the correct approach, please consult a Koppert specialist or a recognized distributor of Koppert products.

En-Strip preventive light curative heavy curative
Rate 1.5-3/m² 3-6/m² 9/m²
m²/unit 1.000-2.000 500-1.000 330
Interval (days) 7-14 7 7
Frequency - min. 3x min. 3x
Remarks - release until control is achieved release until control is achieved

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