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Enforce™ for Whitefly Control
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Enforce™ for Whitefly Control

Enforce™ is a tiny, 100% safe parasitic wasp that specializes in parasitizing whitefly, specifically greenhouse whitefly (Trialeurodes vaporariorum), although it will attack other whitefly species. PRICE: $10.00 per 1000 wasps (10 tags, the minimum order) plus GST and Freight
NZ $12.00
Size  100 wasps per tag (10 tags)
 250 wasps per tag (10 tags)
Encarsia formosa - Whitefly ParasitoidEnforce.pdf

Delivery                        *Important Information*

Same week delivery is not guaranteed as products are subject to availability. If unsure, please contact Bioforce directly, although be assured that we always aim to deliver as promptly as possible.

Enforce will only be sent on Mondays and Tuesdays, and will not be sent on public holidays. Other products can be sent later in the week (Wednesdays and later by agreement), but  orders placed after 1pm on Wednesday will most likely be sent the following week. If you order includes Enforce and is made after Tuesday, then it will likely be processed the following week. Please contact Bioforce directly by phone if immediate delivery is required and we will endeavour to accommodate you, 
 however we do not operate the tag machine after Tuesday, and we will only be able to accommodate you if we have made surplus quantities.  As these products are live organisms, it is important that they arrive quickly to their destination, and we do not send when it is possible they will be in transit over a weekend. Next day delivery is not guaranteed and customers should follow up with CourierPost using the tracking information provided on dispatch.

Bioforce will contact the purchaser advising you of the intended sending date, but only if products will not be shipped within the week of purchase. Please do not purchase the product online if you are unsure, however if the product has been purchased and you are unhappy with the delivery date, we will happily refund you the full amount. Please contact us immediately to complete this, as there will be no refunds once the goods have been sent.

Product Information

Enforce™ is supplied as black parasitized greenhouse whitefly nymphs or black ‘scale’ on cardboard tags, and the adult wasp emerges from this ‘scale’.

Enforce™ tags are sent via fast-post or courier (at the customer’s request).

100 viable Enforce wasps will emerge from each tag

Environmental Conditions Required

Enforce™ works best at temperatures of 20-28 °C, below 18 ° C the wasp's activity decreases, and temperatures above 38 °C are lethal. A wasp life cycle will take between 10 and 30 days, depending on temperature.

Wasps per metre squared:      
Infestation Cucumbers Ornamentals Tomatoes Vegetables
Preventative 2-6 1-3 1-3 1-3
Light 6-12 3-6 3-6 3-6
Heavy 12+ 9+ 9+ 9+

Enforce™ should ideally be introduced to the crop when greenhouse whitefly populations are low as a preventative.

It is recommended that Enforce™ is introduced regularly when whiteflies are present, initially at a minimum of every 2 weeks over at least an 8 week period.

Monitor your plants once a week, and after four weeks black ‘scale’ should be present. When 80% of the ‘scale’ is black, the release rate can be re-evaluated.

Tags can be concentrated in greenhouse whitefly ‘hotspots’ within your crop. Enforce™ adults are able to fly about 20 metres and disperse readily.

Higher release rates may be required during the winter when temperatures are lower and control is more difficult.

Release and Storage Instructions

Enforce™ tags need the following handling and treatment:

  • Do not touch the black ‘scale’ on the tags
  • Do not expose the tags to direct sunlight
  • Hang the tags immediately within the crop,
  • If the tags must be stored, store them in darkness at 10-15 ° C.
  • Do not store the tags for more than 2 days
  • Tags come in strips of up to 10; tags should be separated and hung individually
  • Hang tags one metre below heads of crop, so the wasps work upwards
  • Hang tags in shade
  • Ensure tags are hung in different places each week
  • Tags should be distributed evenly through the crop
  • Leave tags in crop for at least 14 days

Post Release

Enforce™ adults will begin to emerge from the black ‘scale’ on the tags within 2-6 days at 20 ° C. The black case will stay attached to the tags. A small hole should be visible with a hand lens once the adult has emerged.

After three weeks it is safe to assume all Enforce wasps have hatched, so the tags may be removed if desired.

Within four weeks of release, black ‘scale’ should be present within your crop, on the lower leaves of your plants. Adult wasps should emerge within 2-3 weeks.

Before introducing Enforce into your crop, please check residual chemical effects and ensure you know chemical compatibilities and products that may be applied.

Before introducing Enforce™ into your crop, please check residual chemical effects and ensure you know chemical compatibilities and products that may be applied.

Lists of compatible pesticides and persistence periods can be found in the publication "The Good Bug Book", Second edition (2002), editor Richard Llewellyn. Excerpts of the book can be obtained from the Encarsia page of the Australasian Biological Control Association website, click here then scroll to the bottom of the page and click on the PDF link.


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About us

We rear and sell biological control agents, the good guys, for the control of plant pests and diseases. Bioforce advocates the sustainable management of horticultural crops.


“We'd love to get feedback regarding our products, services, and the use of biological control. Please email us with you're comments using the email address to the right” 
Bioforce Team

Contact Details

Ph: (09) 294 8973
Fax: (09) 294 8978
Address: P.O Box 73,
Drury 2247,
New Zealand